summaryrefslogtreecommitdiffstats
path: root/docs/apex/APEX-PCVS-Example.rst
blob: fc42030382d3254bd988a849ef148a58477620d9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
.. This work is licensed under a Creative Commons Attribution 4.0 International License.
.. http://creativecommons.org/licenses/by/4.0

.. _apex-PCVSExample:

Policy-controlled Video Streaming (pcvs) with APEX
**************************************************

.. contents::
    :depth: 3

Introduction
^^^^^^^^^^^^

      .. container:: sectionbody

           .. container:: paragraph

                  This module contains several demos for
                  Policy-controlled Video Streaming (PCVS). Each demo
                  defines a policy using AVRO and Javascript (or other
                  scripting languages for the policy logic). To run the
                  demo, a vanilla Ubuntu server with some extra software
                  packages is required:

               .. container:: ulist

                  -  Mininet as network simulator

                  -  Floodlight as SDN controller

                  -  Kafka as messaging system

                  -  Zookeeper for Kafka configuration

                  -  APEX for policy control

Install Ubuntu Server and SW
^^^^^^^^^^^^^^^^^^^^^^^^^^^^

          .. container:: sect1

            .. rubric:: Install Demo
               :name: install_demo

            .. container:: sectionbody

               .. container:: paragraph

                  Requirements:

               .. container:: ulist

                  -  Ubuntu server: 1.4 GB

                  -  Ubuntu with Xubuntu Desktop, git, Firefox: 2.3 GB

                  -  Ubuntu with all, system updated: 3 GB

                  -  With ZK, Kafka, VLC, Mininet, Floodlight, Python:
                     4.4 GB

                  -  APEX Build (M2 and built): M2 ~ 2 GB, APEX ~3.5 GB

                  -  APEX install (not build locally): ~ 300 MB

               .. container:: paragraph

                  On a Ubuntu OS (install a stable or LTS server first)

               .. container:: listingblock

                  .. container:: content

                     ::

                        # pre for Ubuntu, tools and X
                        sudo apt-get  -y install --no-install-recommends software-properties-common
                        sudo apt-get  -y install --no-install-recommends build-essential
                        sudo apt-get  -y install --no-install-recommends git
                        sudo aptitude -y install --no-install-recommends xubuntu-desktop
                        sudo apt-get  -y install --no-install-recommends firefox


                        # install Java
                        sudo add-apt-repository ppa:webupd8team/java
                        sudo apt-get update
                        sudo apt-get -y install --no-install-recommends oracle-java8-installer
                        java -version


                        # reboot system, run system update, then continue

                        # if VBox additions are needed, install and reboot
                        sudo (cd /usr/local/share; wget https://www.virtualbox.org/download/testcase/VBoxGuestAdditions_5.2.7-120528.iso)
                        sudo mount /usr/local/share/VBoxGuestAdditions_5.2.7-120528.iso /media/cdrom
                        sudo (cd /media/cdrom;VBoxLinuxAdditions.run)


                        # update apt-get DB
                        sudo apt-get update

                        # if APEX is build from source, install maven and rpm
                        sudo apt-get install maven rpm

                        # install ZooKeeper
                        sudo apt-get install zookeeperd

                        # install Kafka
                        (cd /tmp;wget http://ftp.heanet.ie/mirrors/www.apache.org/dist/kafka/1.0.0/kafka_2.12-1.0.0.tgz --show-progress)
                        sudo mkdir /opt/Kafka
                        sudo tar -xvf /tmp/kafka_2.12-1.0.0.tgz -C /opt/Kafka/

                        # install mininet
                        cd /usr/local/src
                        sudo git clone https://github.com/mininet/mininet.git
                        (cd mininet;util/install.sh -a)

                        # install floodlight, requires ant
                        sudo apt-get install ant
                        cd /usr/local/src
                        sudo wget --no-check-certificate https://github.com/floodlight/floodlight/archive/master.zip
                        sudo unzip master.zip
                        cd floodlight-master
                        sudo ant
                        sudo mkdir /var/lib/floodlight
                        sudo chmod 777 /var/lib/floodlight

                        # install python pip
                        sudo apt-get install python-pip

                        # install kafka-python (need newer version from github)
                        cd /usr/local/src
                        sudo git clone https://github.com/dpkp/kafka-python
                        sudo pip install ./kafka-python

                        # install vlc
                        sudo apt-get install vlc

               .. container:: paragraph

                  Install APEX either from source or from a distribution
                  package. See the APEX documentation for details. We
                  assume that APEX is installed in
                  ``/opt/ericsson/apex/apex``

               .. container:: paragraph

                  Copy the LinkMonitor file to Kafka-Python

               .. container:: listingblock

                  .. container:: content

                     ::

                        sudo cp /opt/ericsson/apex/apex/examples/scripts/pcvs/vpnsla/LinkMonitor.py /usr/local/src/kafka-python

               .. container:: paragraph

                  Change the Logback configuration in APEX to logic
                  logging

               .. container:: listingblock

                  .. container:: content

                     ::

                        (cd /opt/ericsson/apex/apex/etc; sudo cp logback-logic.xml logback.xml)

         .. container:: sect1

            .. rubric:: Get the Demo Video
               :name: get_the_demo_video

            .. container:: sectionbody

               .. container:: ulist

                  -  For all download options of the movie please visit
                     http://bbb3d.renderfarming.net/download.html

                  -  For lower-res downloads and mirrors see
                     https://peach.blender.org/download

               .. container:: listingblock

                  .. container:: content

                     ::

                        sudo mkdir /usr/local/src/videos

               .. container:: paragraph

                  Standard 720p (recommended)

               .. container:: listingblock

                  .. container:: content

                     ::

                        (cd /usr/local/src/videos; sudo curl -o big_buck_bunny_480p_surround.avi http://download.blender.org/peach/bigbuckbunny_movies/big_buck_bunny_480p_surround-fix.avi)

               .. container:: paragraph

                  Full HD video

               .. container:: listingblock

                  .. container:: content

                     ::

                        (cd videos; sudo curl -o bbb_sunflower_1080p_60fps_normal.mp4 http://distribution.bbb3d.renderfarming.net/video/mp4/bbb_sunflower_1080p_60fps_normal.mp4)



VPN SLA Demo
^^^^^^^^^^^^^

          .. container:: sect1

            .. container:: sectionbody

               .. container:: paragraph

                  This demo uses a network with several central office
                  and core switches, over which two VPNs are run. A
                  customer ``A`` has two location ``A1`` and ``A2`` and
                  a VPN between them. A customer ``B`` has two location
                  ``B1`` and ``B2`` and a VPN between them.

               .. container:: imageblock

                  .. container:: content

                     |VPN SLA Architecture|

               .. container:: paragraph

                  The architecture above shows the scenario. The
                  components are realized in this demo as follows:

               .. container:: ulist

                  -  *CEP / Analytics* - a simple Python script taking
                     events from Kafka and sending them to APEX

                  -  *APEX / Policy* - the APEX engine running the VPA
                     SLA policy

                  -  *Controller* - A vanilla Floodlight controller
                     taking events from the Link Monitor and configuring
                     Mininet

                  -  *Network* - A network created using Mininet

               .. container:: paragraph

                  The demo requires to start some software (detailed
                  below). To show actual video streams, we use ``VLC``.
                  If you do not want to show video streams, but only the
                  policy, skip the ``VLC`` section.

               .. container:: paragraph

                  All shown scripts are available in a full APEX
                  installation in
                  ``$APEX_HOME/examples/scripts/pcvs/vpnsla``.

               .. container:: sect2

                  .. rubric:: Start all Software
                     :name: start_all_software

                  .. container:: paragraph

                     Create environment variables in a file, say
                     ``env.sh``. In each new Xterm

                  .. container:: ulist

                     -  Source these environment settings, e.g.
                        ``. ./env.sh``

                     -  Run the commands below as root (``sudo`` per
                        command or ``sudo -i`` for interactive mode as
                        shown below)

                  .. container:: listingblock

                     .. container:: content

                        ::

                           #!/usr/bin/env bash

                           export src_dir=/usr/local/src
                           export APEX_HOME=/opt/ericsson/apex/apex
                           export APEX_USER=apexuser

                  .. container:: paragraph

                     In a new Xterm, start Floodlight

                  .. container:: listingblock

                     .. container:: content

                        ::

                           sudo -i
                           . ./env.sh
                           cd $src_dir/floodlight-master && java -jar target/floodlight.jar

                  .. container:: paragraph

                     In a new Xterm start Mininet

                  .. container:: listingblock

                     .. container:: content

                        ::

                           sudo -i
                           . ./env.sh
                           mn -c && python $APEX_HOME/examples/scripts/pcvs/vpnsla/MininetTopology.py

                  .. container:: paragraph

                     In a new Xterm, start Kafka

                  .. container:: listingblock

                     .. container:: content

                        ::

                           sudo -i
                           . ./env.sh
                           /opt/Kafka/kafka_2.12-1.0.0/bin/kafka-server-start.sh /opt/Kafka/kafka_2.12-1.0.0/config/server.properties

                  .. container:: paragraph

                     In a new Xerm start APEX with the Kafka
                     configuration for this demo

                  .. container:: listingblock

                     .. container:: content

                        ::

                           cd $APEX_HOME
                           ./bin/apexApps.sh engine -c examples/config/pcvs/vpnsla/kafka2kafka.json

                  .. container:: paragraph

                     In a new Xterm start the Link Monitor. The Link
                     Monitor has a 30 second sleep to slow down the
                     demonstration. So the first action of it comes 30
                     seconds after start. Every new action in 30 second
                     intervals.

                  .. container:: listingblock

                     .. container:: content

                        ::

                           sudo -i
                           . ./env.sh
                           cd $src_dir
                           xterm -hold -e 'python3 $src_dir/kafka-python/LinkMonitor.py' &

                  .. container:: paragraph

                     Now all software should be started and the demo is
                     running. The Link Monitor will send link up events,
                     picked up by APEX which triggers the policy. Since
                     there is no problem, the policy will do nothing.

               .. container:: sect2

                  .. rubric:: Create 2 Video Streams with VLC
                     :name: create_2_video_streams_with_vlc

                  .. container:: paragraph

                     In the Mininet console, type ``xterm A1 A2`` and
                     ``xterm B1 B2`` to open terminals on these nodes.

                  .. container:: paragraph

                     ``A2`` and ``B2`` are the receiving nodes. In these
                     terminals, run ``vlc-wrapper``. In each opened VLC
                     window do

                  .. container:: ulist

                     -  Click Media → Open Network Stream

                     -  Give the URL as ``rtp://@:5004``

                  .. container:: paragraph

                     ``A1`` and ``B1`` are the sending nodes (sending
                     the video stream) In these terminals, run
                     ``vlc-wrapper``. In each opened VLC window do

                  .. container:: ulist

                     -  Click Media → Stream

                     -  Add the video (from ``/usr/local/src/videos``)

                     -  Click ``Stream``

                     -  Click ``Next``

                     -  Change the destination
                        ``RTP / MPEG Transport Stream`` and click
                        ``Add``

                     -  Change the address and type to ``10.0.0.2`` in
                        ``A1`` and to ``10.0.0.4`` in ``B1``

                     -  Turn off ``Active Transcoding`` (this is
                        important to minimize CPU load)

                     -  Click ``Next``

                     -  Click ``Stream``

                  .. container:: paragraph

                     The video should be streaming across the network
                     from ``A1`` to ``A2`` and from ``B1`` to ``B2``. If
                     the video streams a slow or interrupted the CPU
                     load is too high. In these cases either try a
                     better machine or use a different (lower quality)
                     video stream.

               .. container:: sect2

                  .. rubric:: Take out L09 and let the Policy do it’s
                     Magic
                     :name: take_out_l09_and_let_the_policy_do_it_s_magic

                  .. container:: paragraph

                     Now it is time to take out the link ``L09``. This
                     will be picked up by the Link Monitor, which sends
                     a new event (L09 DOWN) to the policy. The policy
                     then will calculate which customer should be
                     impeded (throttled). This will continue, until SLAs
                     are violated, then a priority calculation will kick
                     in (Customer ``A`` is prioritized in the setup).

                  .. container:: paragraph

                     To initiate this, simply type ``link s5 s6 down``
                     in the Mininet console followed by ``exit``.

                  .. container:: paragraph

                     If you have the video streams running, you will see
                     one or the other struggeling, depending on the
                     policy decision.

               .. container:: sect2

                  .. rubric:: Reset the Demo
                     :name: reset_the_demo

                  .. container:: paragraph

                     If you want to reset the demo, simple stop (in this
                     order) the following process

                  .. container:: ulist

                     -  Link Monitor

                     -  APEX

                     -  Mininet

                     -  Floodlight

                  .. container:: paragraph

                     Then restart them in this order

                  .. container:: ulist

                     -  Floodlight

                     -  Mininet

                     -  APEX

                     -  Link Monitor

               .. container:: sect2

                  .. rubric:: Monitor the Demo
                     :name: monitor_the_demo

                  .. container:: paragraph

                     Floodlight and APEX provide REST interfaces for
                     monitoring.

                  .. container:: ulist

                     -  Floodlight: see `Floodlight
                        Docs <https://floodlight.atlassian.net/wiki/spaces/floodlightcontroller/pages/40403023/Web+GUI>`__
                        for details on how to access the monitoring. In
                        a standard installation as we use here, pointing
                        browser to the URL
                        ``http://localhost:8080/ui/pages/index.html``
                        should work on the same host

                     -  APEX please see the APEX documentation for
                        `Monitoring
                        Client <https://ericsson.github.io/apex-docs/user-manual/engine-apps/um-engapps-eng-monitoring.html>`__
                        or `Full
                        Client <https://ericsson.github.io/apex-docs/user-manual/engine-apps/um-engapps-full-client.html>`__
                        for details on how to monitor APEX.


VPN SLA Policy
^^^^^^^^^^^^^^

            .. container:: sectionbody

               .. container:: paragraph

                  The VPN SLA policy is designed as a MEDA policy. The
                  first state (M = Match) takes the trigger event (a
                  link up or down) and checks if this is a change to the
                  known topology. The second state (E = Establish) takes
                  all available information (trigger event, local
                  context) and defines what situation we have. The third
                  state (D = Decide) takes the situation and selects
                  which algorithm is best to process it. This state can
                  select between ``none`` (nothing to do), ``solved`` (a
                  problem is solved now), ``sla`` (compare the current
                  customer SLA situation and select one to impede), and
                  ``priority`` (impede non-priority customers). The
                  fourth and final state (A = Act) selects the right
                  action for the taken decision and creates the response
                  event sent to the orchestrator.

               .. container:: paragraph

                  We have added three more policies to set the local
                  context: one for adding nodes, one for adding edges
                  (links), and one for adding customers. These policies
                  do not realize any action, they are only here for
                  updating the local context. This mechanism is the
                  fasted way to update local context, and it is
                  independent of any context plugin.

               .. container:: paragraph

                  The policy uses data defined in Avro, so we have a
                  number of Avro schema definitions.

Context Schemas
---------------

         .. container:: sect1

            .. container:: sectionbody

               .. container:: paragraph

                  The context schemas are for the local context. We
                  model edges and nodes for the topology, customers, and
                  problems with all information on detected problems.

               .. container:: listingblock

                  .. container:: content

                     .. code:: CodeRay

                        {
                            "type" : "record",
                            "name" : "TopologyEdges",
                            "fields" : [
                                {"name": "name",   "type": "string",  "doc": "Name of the Edge, typically a link name"},
                                {"name": "start",  "type": "string",  "doc": "Edge endpoint: start - a node name"},
                                {"name": "end",    "type": "string",  "doc": "Edge endpoint: end - a node name"},
                                {"name": "active", "type": "boolean", "doc": "Flag for active/inactive edges, inactive means a link is down"}
                            ]
                        }

               .. container:: listingblock

                  .. container:: content

                     .. code:: CodeRay

                        {
                            "type" : "record",
                            "name" : "TopologyNodes",
                            "fields" : [
                                {"name" : "name",   "type" : "string", "doc": "The name of the node"},
                                {"name" : "mnname", "type" : "string", "doc": "The name of the node in Mininet"}
                            ]
                        }

               .. container:: listingblock

                  .. container:: content

                     .. code:: CodeRay

                        {
                            "type" : "record",
                            "name" : "Customer",
                            "fields" : [
                                {"name" : "customerName", "type" : "string"},
                                {"name" : "dtSLA"       , "type" : "int"},
                                {"name" : "dtYTD"       , "type" : "int"},
                                {"name" : "priority"    , "type" : "boolean"},
                                {"name" : "satisfaction", "type" : "int"},
                                {
                                    "name": "links",
                                    "doc": "Links used by this customer",
                                    "type": {"type"  : "array", "items" : "string"}
                                }
                            ]
                        }


Trigger Schemas
---------------

        .. container:: sect1

            .. container:: sectionbody

               .. container:: paragraph

                  The trigger event provides a status as ``UP`` or
                  ``DOWN``. To avoid tests for these strings in the
                  logic, we defined an Avro schema for an enumeration.
                  This does not impact the trigger system (it can still
                  send the strings), but makes the task logic simpler.

               .. container:: listingblock

                  .. container:: content

                     .. code:: CodeRay

                        {
                            "type": "enum",
                            "name": "Status",
                            "symbols" : [
                                "UP",
                                "DOWN"
                            ]
                        }

Context Logic Nodes
--------------------

         .. container:: sect1

            .. container:: sectionbody

               .. container:: paragraph

                  The node context logic simply takes the trigger event
                  (for context) and creates a new node in the local
                  context topology.

               .. container:: listingblock

                  .. container:: content

                     .. code:: CodeRay

                        /*
                         * ============LICENSE_START=======================================================
                         *  Copyright (C) 2016-2018 Ericsson. All rights reserved.
                         * ================================================================================
                         * Licensed under the Apache License, Version 2.0 (the "License");
                         * you may not use this file except in compliance with the License.
                         * You may obtain a copy of the License at
                         *
                         *      http://www.apache.org/licenses/LICENSE-2.0
                         *
                         * Unless required by applicable law or agreed to in writing, software
                         * distributed under the License is distributed on an "AS IS" BASIS,
                         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
                         * See the License for the specific language governing permissions and
                         * limitations under the License.
                         *
                         * SPDX-License-Identifier: Apache-2.0
                         * ============LICENSE_END=========================================================
                         */

                        load("nashorn:mozilla_compat.js");

                        var logger = executor.logger;
                        logger.trace("start: " + executor.subject.id);
                        logger.trace("-- infields: " + executor.inFields);

                        var ifNodeName = executor.inFields["nodeName"];
                        var ifMininetName = executor.inFields["mininetName"];

                        var albumTopoNodes = executor.getContextAlbum("albumTopoNodes");

                        logger.trace("-- got infields, testing existing node");

                        var ctxtNode = albumTopoNodes.get(ifNodeName);
                        if (ctxtNode != null) {
                            albumTopoNodes.remove(ifNodeName);
                            logger.trace("-- removed node: <" + ifNodeName + ">");
                        }

                        logger.trace("-- creating node: <" + ifNodeName + ">");
                        ctxtNode = "{name:" + ifNodeName + ", mnname:" + ifMininetName + "}";
                        albumTopoNodes.put(ifNodeName, ctxtNode);

                        if (logger.isTraceEnabled()) {
                            logger.trace("   >> *** Nodes ***");
                            if (albumTopoNodes != null) {
                                for (var i = 0; i < albumTopoNodes.values().size(); i++) {
                                    logger.trace("   >> >> " + albumTopoNodes.values().get(i).get("name") + " : "
                                            + albumTopoNodes.values().get(i).get("mnname"));
                                }
                            } else {
                                logger.trace("   >> >> node album is null");
                            }
                        }

                        executor.outFields["report"] = "node ctxt :: added node " + ifNodeName;

                        logger.info("vpnsla: ctxt added node " + ifNodeName);

                        var returnValueType = Java.type("java.lang.Boolean");
                        var returnValue = new returnValueType(true);
                        logger.trace("finished: " + executor.subject.id);
                        logger.debug(".");

Context Logic Edges
--------------------

         .. container:: sect1

            .. container:: sectionbody

               .. container:: paragraph

                  The edge context logic simply takes the trigger event
                  (for context) and creates a new edge in the local
                  context topology.

               .. container:: listingblock

                  .. container:: content

                     .. code:: CodeRay

                        /*
                         * ============LICENSE_START=======================================================
                         *  Copyright (C) 2016-2018 Ericsson. All rights reserved.
                         * ================================================================================
                         * Licensed under the Apache License, Version 2.0 (the "License");
                         * you may not use this file except in compliance with the License.
                         * You may obtain a copy of the License at
                         *
                         *      http://www.apache.org/licenses/LICENSE-2.0
                         *
                         * Unless required by applicable law or agreed to in writing, software
                         * distributed under the License is distributed on an "AS IS" BASIS,
                         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
                         * See the License for the specific language governing permissions and
                         * limitations under the License.
                         *
                         * SPDX-License-Identifier: Apache-2.0
                         * ============LICENSE_END=========================================================
                         */

                        load("nashorn:mozilla_compat.js");

                        var logger = executor.logger;
                        logger.trace("start: " + executor.subject.id);
                        logger.trace("-- infields: " + executor.inFields);

                        var ifEdgeName = executor.inFields["edgeName"];
                        var ifEdgeStatus = executor.inFields["status"];

                        var albumTopoEdges = executor.getContextAlbum("albumTopoEdges");

                        logger.trace("-- got infields, testing existing edge");

                        var ctxtEdge = albumTopoEdges.get(ifEdgeName);
                        if (ctxtEdge != null) {
                            albumTopoEdges.remove(ifEdgeName);
                            logger.trace("-- removed edge: <" + ifEdgeName + ">");
                        }

                        logger.trace("-- creating edge: <" + ifEdgeName + ">");
                        ctxtEdge = "{name:" + ifEdgeName + ", start:" + executor.inFields["start"] + ", end:" + executor.inFields["end"]
                                + ", active:" + ifEdgeStatus + "}";
                        albumTopoEdges.put(ifEdgeName, ctxtEdge);

                        if (logger.isTraceEnabled()) {
                            logger.trace("   >> *** Edges ***");
                            if (albumTopoEdges != null) {
                                for (var i = 0; i < albumTopoEdges.values().size(); i++) {
                                    logger.trace("   >> >> " + albumTopoEdges.values().get(i).get("name") + " \t "
                                            + albumTopoEdges.values().get(i).get("start") + " --> " + albumTopoEdges.values().get(i).get("end")
                                            + " \t " + albumTopoEdges.values().get(i).get("active"));
                                }
                            } else {
                                logger.trace("   >> >> edge album is null");
                            }
                        }

                        executor.outFields["report"] = "edge ctxt :: added edge " + ifEdgeName;

                        logger.info("vpnsla: ctxt added edge " + ifEdgeName);

                        var returnValueType = Java.type("java.lang.Boolean");
                        var returnValue = new returnValueType(true);
                        logger.trace("finished: " + executor.subject.id);
                        logger.debug(".");

Context Logic Customer
----------------------

         .. container:: sect1

            .. container:: sectionbody

               .. container:: paragraph

                  The customer context logic simply takes the trigger
                  event (for context) and creates a new customer in the
                  local context topology.

               .. container:: listingblock

                  .. container:: content

                     .. code:: CodeRay

                        /*
                         * ============LICENSE_START=======================================================
                         *  Copyright (C) 2016-2018 Ericsson. All rights reserved.
                         * ================================================================================
                         * Licensed under the Apache License, Version 2.0 (the "License");
                         * you may not use this file except in compliance with the License.
                         * You may obtain a copy of the License at
                         *
                         *      http://www.apache.org/licenses/LICENSE-2.0
                         *
                         * Unless required by applicable law or agreed to in writing, software
                         * distributed under the License is distributed on an "AS IS" BASIS,
                         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
                         * See the License for the specific language governing permissions and
                         * limitations under the License.
                         *
                         * SPDX-License-Identifier: Apache-2.0
                         * ============LICENSE_END=========================================================
                         */

                        load("nashorn:mozilla_compat.js");

                        var logger = executor.logger;
                        logger.trace("start: " + executor.subject.id);
                        logger.trace("-- infields: " + executor.inFields);

                        var ifCustomerName = executor.inFields["customerName"];
                        var ifLinks = executor.inFields["links"];

                        logger.trace("-- got infields, testing existing customer");
                        var ctxtCustomer = executor.getContextAlbum("albumCustomerMap").get(ifCustomerName);
                        if (ctxtCustomer != null) {
                            executor.getContextAlbum("albumCustomerMap").remove(ifCustomerName);
                            logger.trace("-- removed customer: <" + ifCustomerName + ">");
                        }

                        logger.trace("-- creating customer: <" + ifCustomerName + ">");
                        var links = new Array();
                        for (var i = 0; i < ifLinks.split(" ").length; i++) {
                            var link = executor.getContextAlbum("albumTopoEdges").get(ifLinks.split(" ")[i]);
                            if (link != null) {
                                logger.trace("-- link: <" + ifLinks.split(" ")[i] + ">");
                                links.push(ifLinks.split(" ")[i]);
                            } else {
                                logger.trace("-- unknown link: <" + ifLinks.split(" ")[i] + "> for customer <" + ifCustomerName + ">");
                            }
                        }
                        logger.trace("-- links: <" + links + ">");
                        ctxtCustomer = "{customerName:" + ifCustomerName + ", dtSLA:" + executor.inFields["dtSLA"] + ", dtYTD:"
                                + executor.inFields["dtYTD"] + ", priority:" + executor.inFields["priority"] + ", satisfaction:"
                                + executor.inFields["satisfaction"] + ", links:[" + links + "]}";

                        executor.getContextAlbum("albumCustomerMap").put(ifCustomerName, ctxtCustomer);

                        if (logger.isTraceEnabled()) {
                            logger.trace("   >> *** Customers ***");
                            if (executor.getContextAlbum("albumCustomerMap") != null) {
                                for (var i = 0; i < executor.getContextAlbum("albumCustomerMap").values().size(); i++) {
                                    logger.trace("   >> >> " + executor.getContextAlbum("albumCustomerMap").values().get(i).get("customerName")
                                            + " : " + "dtSLA=" + executor.getContextAlbum("albumCustomerMap").values().get(i).get("dtSLA")
                                            + " : " + "dtYTD=" + executor.getContextAlbum("albumCustomerMap").values().get(i).get("dtYTD")
                                            + " : " + "links=" + executor.getContextAlbum("albumCustomerMap").values().get(i).get("links")
                                            + " : " + "priority="
                                            + executor.getContextAlbum("albumCustomerMap").values().get(i).get("priority") + " : "
                                            + "satisfaction="
                                            + executor.getContextAlbum("albumCustomerMap").values().get(i).get("satisfaction"));
                                }
                            } else {
                                logger.trace("   >> >> customer album is null");
                            }
                        }

                        executor.outFields["report"] = "customer ctxt :: added customer: " + ifCustomerName;

                        logger.info("vpnsla: ctxt added customer " + ifCustomerName);

                        var returnValueType = Java.type("java.lang.Boolean");
                        var returnValue = new returnValueType(true);
                        logger.trace("finished: " + executor.subject.id);
                        logger.debug(".");

Logic: Match
------------

         .. container:: sect1

            .. container:: sectionbody

               .. container:: paragraph

                  This is the logic for the match state. It is kept very
                  simple. Beside taking the trigger event, it also
                  creates a timestamp. This timestamp is later used for
                  SLA and downtime calculations as well as for some
                  performance information of the policy.

               .. container:: listingblock

                  .. container:: content

                     .. code:: CodeRay

                        /*
                         * ============LICENSE_START=======================================================
                         *  Copyright (C) 2016-2018 Ericsson. All rights reserved.
                         * ================================================================================
                         * Licensed under the Apache License, Version 2.0 (the "License");
                         * you may not use this file except in compliance with the License.
                         * You may obtain a copy of the License at
                         *
                         *      http://www.apache.org/licenses/LICENSE-2.0
                         *
                         * Unless required by applicable law or agreed to in writing, software
                         * distributed under the License is distributed on an "AS IS" BASIS,
                         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
                         * See the License for the specific language governing permissions and
                         * limitations under the License.
                         *
                         * SPDX-License-Identifier: Apache-2.0
                         * ============LICENSE_END=========================================================
                         */

                        load("nashorn:mozilla_compat.js");

                        var now = new Date().getTime();
                        executor.outFields["matchStart"] = now;

                        importClass(org.slf4j.LoggerFactory);

                        var logger = executor.logger;
                        logger.trace("start: " + executor.subject.id);
                        logger.trace("-- infields: " + executor.inFields);

                        var rootLogger = LoggerFactory.getLogger(logger.ROOT_LOGGER_NAME);

                        var ifEdgeName = executor.inFields["edgeName"];
                        var ifLinkStatus = executor.inFields["status"];

                        var albumTopoEdges = executor.getContextAlbum("albumTopoEdges");

                        logger.trace("-- got infields, checking albumTopoEdges changes");

                        var active = false;
                        switch (ifLinkStatus.toString()) {
                        case "UP":
                            active = true;
                            break;
                        case "DOWN":
                            active = false;
                            break;
                        default:
                            active = false;
                            logger.error("-- trigger sent unknown link status <" + ifLinkStatus + "> for link <" + ifEdgeName + ">");
                            rootLogger.error(executor.subject.id + " " + "-- trigger sent unknown link status <" + ifLinkStatus
                                    + "> for link <" + ifEdgeName + ">");
                        }

                        var link = albumTopoEdges.get(ifEdgeName);
                        if (link == null) {
                            logger.trace("-- link <" + ifEdgeName + "> not in albumTopoEdges");
                        } else {
                            logger.trace("-- found link <" + link + "> in albumTopoEdges");
                            logger.trace("-- active <" + active + "> : link.active <" + link.get("active") + ">");
                            if (active != link.get("active")) {
                                link.put("active", active);
                                logger.trace("-- link <" + ifEdgeName + "> status changed to <active:" + link.get("active") + ">");
                                executor.outFields["hasChanged"] = true;
                            } else {
                                logger.trace("-- link <" + ifEdgeName + "> status not changed <active:" + link.get("active") + ">");
                                executor.outFields["hasChanged"] = false;
                            }
                        }

                        executor.outFields["edgeName"] = ifEdgeName;
                        executor.outFields["status"] = ifLinkStatus;

                        logger.info("vpnsla: detected " + ifEdgeName + " as " + ifLinkStatus);

                        var returnValueType = Java.type("java.lang.Boolean");
                        var returnValue = new returnValueType(true);
                        logger.trace("finished: " + executor.subject.id);
                        logger.debug(".m");


Logic: Policy Establish State
-----------------------------

         .. container:: sect1

            .. container:: sectionbody

               .. container:: paragraph

                  This is the logic for the establish state. It is the
                  most complicated logic, since establishing a situation
                  for a decision is the most important part of any
                  policy. First, the policy describes what we find (the
                  switch block), in terms of 8 normal situations and 1
                  extreme error case.

               .. container:: paragraph

                  If required, it creates local context information for
                  the problem (if it is new) or updates it (if the
                  problem still exists). It also calculates customer SLA
                  downtime and checks for any SLA violations. Finally,
                  it creates a situation object.

               .. container:: listingblock

                  .. container:: content

                     .. code:: CodeRay

                        /*
                         * ============LICENSE_START=======================================================
                         *  Copyright (C) 2016-2018 Ericsson. All rights reserved.
                         * ================================================================================
                         * Licensed under the Apache License, Version 2.0 (the "License");
                         * you may not use this file except in compliance with the License.
                         * You may obtain a copy of the License at
                         *
                         *      http://www.apache.org/licenses/LICENSE-2.0
                         *
                         * Unless required by applicable law or agreed to in writing, software
                         * distributed under the License is distributed on an "AS IS" BASIS,
                         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
                         * See the License for the specific language governing permissions and
                         * limitations under the License.
                         *
                         * SPDX-License-Identifier: Apache-2.0
                         * ============LICENSE_END=========================================================
                         */

                        load("nashorn:mozilla_compat.js");
                        importClass(org.slf4j.LoggerFactory);

                        importClass(java.util.ArrayList);

                        importClass(org.apache.avro.generic.GenericData.Array);
                        importClass(org.apache.avro.generic.GenericRecord);
                        importClass(org.apache.avro.Schema);

                        var logger = executor.logger;
                        logger.trace("start: " + executor.subject.id);
                        logger.trace("-- infields: " + executor.inFields);

                        var rootLogger = LoggerFactory.getLogger(logger.ROOT_LOGGER_NAME);

                        var ifEdgeName = executor.inFields["edgeName"];
                        var ifEdgeStatus = executor.inFields["status"].toString();
                        var ifhasChanged = executor.inFields["hasChanged"];
                        var ifMatchStart = executor.inFields["matchStart"];

                        var albumCustomerMap = executor.getContextAlbum("albumCustomerMap");
                        var albumProblemMap = executor.getContextAlbum("albumProblemMap");

                        var linkProblem = albumProblemMap.get(ifEdgeName);

                        // create outfiled for situation
                        var situation = executor.subject.getOutFieldSchemaHelper("situation").createNewInstance();
                        situation.put("violatedSLAs", new ArrayList());

                        // create a string as states+hasChanged+linkProblem and switch over it
                        var switchTest = ifEdgeStatus + ":" + ifhasChanged + ":" + (linkProblem == null ? "no" : "yes");
                        switch (switchTest) {
                        case "UP:false:no":
                            logger.trace("-- edge <" + ifEdgeName + "> UP:false:no => everything ok");
                            logger.info("vpnsla: everything ok");
                            situation.put("problemID", "NONE");
                            break;
                        case "UP:false:yes":
                            logger.trace("-- edge <" + ifEdgeName + "> UP:false:yes ==> did we miss earlier up?, removing problem");
                            albumProblemMap.remove(ifEdgeName);
                            linkProblem = null;
                            situation.put("problemID", "NONE");
                            break;
                        case "UP:true:no":
                            logger.trace("-- edge <" + ifEdgeName + "> UP:true:no ==> did we miss the earlier down?, creating new problem");
                            situation.put("problemID", ifEdgeName);
                            break;
                        case "UP:true:yes":
                            logger.trace("-- edge <" + ifEdgeName + "> UP:true:yes ==> detected solution, link up again");
                            logger.info("vpnsla: problem solved");
                            linkProblem.put("endTime", ifMatchStart);
                            linkProblem.put("status", "SOLVED");
                            situation.put("problemID", "NONE");
                            break;
                        case "DOWN:false:no":
                            logger.trace("-- edge <" + ifEdgeName + "> DOWN:false:no ==> did we miss an earlier down?, creating new problem");
                            situation.put("problemID", ifEdgeName);
                            break;
                        case "DOWN:false:yes":
                            logger.trace("-- edge <" + ifEdgeName + "> DOWN:false:yes ==> problem STILL exists");
                            logger.info("vpnsla: problem still exists");
                            linkProblem.put("status", "STILL");
                            situation.put("problemID", ifEdgeName);
                            break;
                        case "DOWN:true:no":
                            logger.trace("-- edge <" + ifEdgeName + "> DOWN:true:no ==> found NEW problem");
                            logger.info("vpnsla: this is a new problem");
                            situation.put("problemID", ifEdgeName);
                            break;
                        case "DOWN:true:yes":
                            logger.trace("-- edge <" + ifEdgeName
                                    + "> DOWN:true:yes ==> did we miss to remove an earlier problem?, remove and create new problem");
                            linkProblem = null;
                            situation.put("problemID", ifEdgeName);
                            break;

                        default:
                            logger.error("-- input wrong for edge" + ifEdgeName + ": edge status <" + ifEdgeStatus
                                    + "> unknown or null on hasChanged <" + ifhasChanged + ">");
                            rootLogger.error("-- input wrong for edge" + ifEdgeName + ": edge status <" + ifEdgeStatus
                                    + "> unknown or null on hasChanged <" + ifhasChanged + ">");
                        }

                        // create new problem if situation requires it
                        if (situation.get("problemID").equals(ifEdgeName) && linkProblem == null) {
                            logger.trace("-- edge <" + ifEdgeName + "> creating new problem");
                            linkProblem = albumProblemMap.getSchemaHelper().createNewInstance();
                            linkProblem.put("edge", ifEdgeName);
                            linkProblem.put("startTime", ifMatchStart);
                            linkProblem.put("lastUpdate", ifMatchStart);
                            linkProblem.put("endTime", 0);
                            linkProblem.put("status", "NEW");
                            linkProblem.put("edgeUsedBy", new ArrayList());
                            linkProblem.put("impededLast", new ArrayList());

                            for (var i = 0; i < albumCustomerMap.values().size(); i++) {
                                var customer = albumCustomerMap.values().get(i);
                                var customerLinks = albumCustomerMap.values().get(i).get("links");
                                for (var k = 0; k < customerLinks.size(); k++) {
                                    if (customerLinks.get(k) == ifEdgeName) {
                                        linkProblem.get("edgeUsedBy").add(customer.get("customerName"));
                                    }
                                }
                            }
                            albumProblemMap.put(ifEdgeName, linkProblem);
                            logger.trace("-- edge <" + ifEdgeName + "> problem created as <" + linkProblem + ">");
                        }

                        // set dtYTD if situation requires it
                        if (linkProblem != null && (linkProblem.get("status") == "STILL" || linkProblem.get("status") == "SOLVED")) {
                            var linkDownTimeinSecs = (ifMatchStart - linkProblem.get("lastUpdate")) / 1000;
                            logger.trace("-- edge <" + ifEdgeName + "> down time: " + linkDownTimeinSecs + " s");
                            for (var k = 0; k < linkProblem.get("impededLast").size(); k++) {
                                for (var i = 0; i < albumCustomerMap.values().size(); i++) {
                                    var customer = albumCustomerMap.values().get(i);
                                    if (customer.get("customerName").equals(linkProblem.get("impededLast").get(k))) {
                                        logger.info("-- vpnsla: customer " + customer.get("customerName") + " YDT downtime increased from "
                                                + customer.get("dtYTD") + " to " + (customer.get("dtYTD") + linkDownTimeinSecs));
                                        customer.put("dtYTD", (customer.get("dtYTD") + linkDownTimeinSecs))
                                    }
                                }
                            }
                            // set lastUpdate to this policy execution for next execution calculation
                            linkProblem.put("lastUpdate", ifMatchStart);
                        }

                        // check SLA violations if situation requires it
                        if (linkProblem != null && linkProblem.get("status") != "SOLVED") {
                            logger.info(">e> customer\tDT SLA\tDT YTD\tviolation");
                            for (var i = 0; i < albumCustomerMap.values().size(); i++) {
                                var customer = albumCustomerMap.values().get(i);
                                if (customer.get("dtYTD") > customer.get("dtSLA")) {
                                    situation.get("violatedSLAs").add(customer.get("customerName"));
                                    logger.info(">e> " + customer.get("customerName") + "\t\t" + customer.get("dtSLA") + "s\t"
                                            + customer.get("dtYTD") + "s\t" + "!!");
                                } else {
                                    logger.info(">e> " + customer.get("customerName") + "\t\t" + customer.get("dtSLA") + "s\t"
                                            + customer.get("dtYTD") + "s");
                                }
                            }
                        }

                        executor.outFields["situation"] = situation;

                        logger.trace("-- out fields <" + executor.outFields + ">");

                        var returnValueType = Java.type("java.lang.Boolean");
                        var returnValue = new returnValueType(true);
                        logger.trace("finished: " + executor.subject.id);
                        logger.debug(".e");

Logic: Policy Decide State
--------------------------

         .. container:: sect1

            .. container:: sectionbody

               .. container:: paragraph

                  The decide state can select between different
                  algorithms depending on the situation. So it needs a
                  Task Selection Logic (TSL). This TSL select a task in
                  the current policy execution (i.e. potentially a
                  different one per execution).

               .. container:: listingblock

                  .. container:: content

                     .. code:: CodeRay

                        /*
                         * ============LICENSE_START=======================================================
                         *  Copyright (C) 2016-2018 Ericsson. All rights reserved.
                         * ================================================================================
                         * Licensed under the Apache License, Version 2.0 (the "License");
                         * you may not use this file except in compliance with the License.
                         * You may obtain a copy of the License at
                         *
                         *      http://www.apache.org/licenses/LICENSE-2.0
                         *
                         * Unless required by applicable law or agreed to in writing, software
                         * distributed under the License is distributed on an "AS IS" BASIS,
                         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
                         * See the License for the specific language governing permissions and
                         * limitations under the License.
                         *
                         * SPDX-License-Identifier: Apache-2.0
                         * ============LICENSE_END=========================================================
                         */

                        load("nashorn:mozilla_compat.js");
                        importClass(org.slf4j.LoggerFactory);

                        var logger = executor.logger;
                        logger.trace("start: " + executor.subject.id + " - TSL");

                        var rootLogger = LoggerFactory.getLogger(logger.ROOT_LOGGER_NAME);

                        var ifSituation = executor.inFields["situation"];

                        var albumProblemMap = executor.getContextAlbum("albumProblemMap");

                        var returnValueType = Java.type("java.lang.Boolean");
                        if (ifSituation.get("problemID") == "NONE") {
                            logger.trace("-- situation has no problem, selecting <VpnSlaPolicyDecideNoneTask>");
                            executor.subject.getTaskKey("VpnSlaPolicyDecideNoneTask").copyTo(executor.selectedTask);
                            var returnValue = new returnValueType(true);
                        } else if (albumProblemMap.get(ifSituation.get("problemID")).get("status") == "SOLVED") {
                            logger.trace("-- situation is solved, selecting <VpnSlaPolicyDecideSolvedTask>");
                            executor.subject.getTaskKey("VpnSlaPolicyDecideSolvedTask").copyTo(executor.selectedTask);
                            var returnValue = new returnValueType(true);
                        } else if (ifSituation.get("violatedSLAs") != null && ifSituation.get("violatedSLAs").size() > 0) {
                            logger.trace("-- situation is problem with violations, selecting <VpnSlaPolicyDecidePriorityTask>");
                            executor.subject.getTaskKey("VpnSlaPolicyDecidePriorityTask").copyTo(executor.selectedTask);
                            var returnValue = new returnValueType(true);
                        } else if (ifSituation.get("violatedSLAs") != null && ifSituation.get("violatedSLAs").size() == 0) {
                            logger.trace("-- situation is problem without violations, selecting <VpnSlaPolicyDecideSlaTask>");
                            executor.subject.getTaskKey("VpnSlaPolicyDecideSlaTask").copyTo(executor.selectedTask);
                            var returnValue = new returnValueType(true);
                        } else {
                            logger.error("-- detected unknown decision for situation <" + ifSituation.get("problemID") + ">");
                            rootLogger.error(executor.subject.id + " " + "-- detected unknown decision for situation <"
                                    + ifSituation.get("problemID") + ">");
                            var returnValue = new returnValueType(false);
                        }

                        logger.trace("finished: " + executor.subject.id);
                        logger.debug(".d-tsl");

               .. container:: paragraph

                  The actual task logic are then ``none``, ``solved``,
                  ``sla``, and ``priority``.

Logic: Decide None
-------------------

         .. container:: sect1

            .. container:: sectionbody

               .. container:: listingblock

                  .. container:: content

                     .. code:: CodeRay

                        /*
                         * ============LICENSE_START=======================================================
                         *  Copyright (C) 2016-2018 Ericsson. All rights reserved.
                         * ================================================================================
                         * Licensed under the Apache License, Version 2.0 (the "License");
                         * you may not use this file except in compliance with the License.
                         * You may obtain a copy of the License at
                         *
                         *      http://www.apache.org/licenses/LICENSE-2.0
                         *
                         * Unless required by applicable law or agreed to in writing, software
                         * distributed under the License is distributed on an "AS IS" BASIS,
                         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
                         * See the License for the specific language governing permissions and
                         * limitations under the License.
                         *
                         * SPDX-License-Identifier: Apache-2.0
                         * ============LICENSE_END=========================================================
                         */

                        load("nashorn:mozilla_compat.js");
                        importClass(org.slf4j.LoggerFactory);

                        importClass(java.util.ArrayList);

                        importClass(org.apache.avro.generic.GenericData.Array);
                        importClass(org.apache.avro.generic.GenericRecord);
                        importClass(org.apache.avro.Schema);

                        var logger = executor.logger;
                        logger.trace("start: " + executor.subject.id);
                        logger.trace("-- infields: " + executor.inFields);

                        var rootLogger = LoggerFactory.getLogger(logger.ROOT_LOGGER_NAME);

                        var ifSituation = executor.inFields["situation"];

                        // create outfiled for decision
                        var decision = executor.subject.getOutFieldSchemaHelper("decision").createNewInstance();
                        decision.put("description", "None, everything is ok");
                        decision.put("decision", "NONE");
                        decision.put("customers", new ArrayList());

                        var returnValueType = Java.type("java.lang.Boolean");
                        if (ifSituation.get("problemID") == "NONE") {
                            logger.trace("-- no problem, everything ok");
                            var returnValue = new returnValueType(true);
                        } else {
                            logger.trace("-- wrong problemID <" + problemID + "> for NONE task, we should not be here");
                            rootLogger.error(executor.subject.id + " " + "-- wrong problemID <" + problemID
                                    + "> for NONE task, we should not be here");
                            var returnValue = new returnValueType(false);
                        }

                        executor.outFields["decision"] = decision;

                        logger.trace("finished: " + executor.subject.id);
                        logger.debug(".d-non");

Logic: Decide Solved
---------------------

         .. container:: sect1

            .. container:: sectionbody

               .. container:: listingblock

                  .. container:: content

                     .. code:: CodeRay

                        /*
                         * ============LICENSE_START=======================================================
                         *  Copyright (C) 2016-2018 Ericsson. All rights reserved.
                         * ================================================================================
                         * Licensed under the Apache License, Version 2.0 (the "License");
                         * you may not use this file except in compliance with the License.
                         * You may obtain a copy of the License at
                         *
                         *      http://www.apache.org/licenses/LICENSE-2.0
                         *
                         * Unless required by applicable law or agreed to in writing, software
                         * distributed under the License is distributed on an "AS IS" BASIS,
                         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
                         * See the License for the specific language governing permissions and
                         * limitations under the License.
                         *
                         * SPDX-License-Identifier: Apache-2.0
                         * ============LICENSE_END=========================================================
                         */

                        load("nashorn:mozilla_compat.js");
                        importClass(org.slf4j.LoggerFactory);

                        importClass(java.util.ArrayList);

                        importClass(org.apache.avro.generic.GenericData.Array);
                        importClass(org.apache.avro.generic.GenericRecord);
                        importClass(org.apache.avro.Schema);

                        var logger = executor.logger;
                        logger.trace("start: " + executor.subject.id);
                        logger.trace("-- infields: " + executor.inFields);

                        var rootLogger = LoggerFactory.getLogger(logger.ROOT_LOGGER_NAME);

                        var ifSituation = executor.inFields["situation"];

                        var albumProblemMap = executor.getContextAlbum("albumProblemMap");

                        // create outfiled for decision
                        var decision = executor.subject.getOutFieldSchemaHelper("decision").createNewInstance();
                        decision.put("description", "None, everything is ok");
                        decision.put("decision", "REBUILD");
                        decision.put("customers", new ArrayList());
                        decision.put("problemID", ifSituation.get("problemID"));

                        var returnValueType = Java.type("java.lang.Boolean");
                        if (albumProblemMap.get(ifSituation.get("problemID")).get("status") == "SOLVED") {
                            logger.trace("-- problem solved");
                            var returnValue = new returnValueType(true);
                        } else {
                            logger.trace("-- wrong problemID <" + problemID + "> for SOLVED task, we should not be here");
                            rootLogger.error(executor.subject.id + " " + "-- wrong problemID <" + problemID
                                    + "> for SOLVED task, we should not be here");
                            var returnValue = new returnValueType(false);
                        }

                        executor.outFields["decision"] = decision;

                        logger.info("vpnsla: sla solved, problem solved");

                        logger.trace("finished: " + executor.subject.id);
                        logger.debug(".d-non");

Logic: Decide SLA
------------------

         .. container:: sect1

            .. container:: sectionbody

               .. container:: listingblock

                  .. container:: content

                     .. code:: CodeRay

                        /*
                         * ============LICENSE_START=======================================================
                         *  Copyright (C) 2016-2018 Ericsson. All rights reserved.
                         * ================================================================================
                         * Licensed under the Apache License, Version 2.0 (the "License");
                         * you may not use this file except in compliance with the License.
                         * You may obtain a copy of the License at
                         *
                         *      http://www.apache.org/licenses/LICENSE-2.0
                         *
                         * Unless required by applicable law or agreed to in writing, software
                         * distributed under the License is distributed on an "AS IS" BASIS,
                         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
                         * See the License for the specific language governing permissions and
                         * limitations under the License.
                         *
                         * SPDX-License-Identifier: Apache-2.0
                         * ============LICENSE_END=========================================================
                         */

                        load("nashorn:mozilla_compat.js");
                        importClass(org.slf4j.LoggerFactory);

                        importClass(java.util.ArrayList);

                        importClass(org.apache.avro.generic.GenericData.Array);
                        importClass(org.apache.avro.generic.GenericRecord);
                        importClass(org.apache.avro.Schema);

                        var logger = executor.logger;
                        logger.trace("start: " + executor.subject.id);
                        logger.trace("-- infields: " + executor.inFields);

                        var rootLogger = LoggerFactory.getLogger(logger.ROOT_LOGGER_NAME);

                        var ifSituation = executor.inFields["situation"];

                        var albumCustomerMap = executor.getContextAlbum("albumCustomerMap");
                        var albumProblemMap = executor.getContextAlbum("albumProblemMap");

                        // create outfiled for decision
                        var decision = executor.subject.getOutFieldSchemaHelper("decision").createNewInstance();
                        decision.put("description", "Impede given customers selected based on maximum SLA delta");
                        decision.put("decision", "IMPEDE");
                        decision.put("problemID", ifSituation.get("problemID"));
                        decision.put("customers", new ArrayList());

                        var problem = albumProblemMap.get(ifSituation.get("problemID"));
                        var returnValueType = Java.type("java.lang.Boolean");
                        if (problem != null && ifSituation.get("violatedSLAs").size() == 0) {
                            logger.trace("-- impede by maximum SLA");
                            var customer = "";
                            var customerSla = 0;
                            for (var i = 0; i < problem.get("edgeUsedBy").size(); i++) {
                                customerCtxt = albumCustomerMap.get(problem.get("edgeUsedBy").get(i).toString());
                                if (customerSla == 0) {
                                    customerSla = customerCtxt.get("dtSLA") - customerCtxt.get("dtYTD");
                                }
                                if ((customerCtxt.get("dtSLA") - customerCtxt.get("dtYTD")) >= customerSla) {
                                    customer = customerCtxt.get("customerName");
                                    customerSla = (customerCtxt.get("dtSLA") - customerCtxt.get("dtYTD"));
                                }
                            }
                            decision.get("customers").add(customer);
                            var returnValue = new returnValueType(true);
                        } else {
                            logger.trace("-- wrong problemID <" + ifSituation.get("problemID") + "> for SLA task, we should not be here");
                            rootLogger.error(executor.subject.id + " " + "-- wrong problemID <" + ifSituation.get("problemID")
                                    + "> for SLA task, we should not be here");
                            var returnValue = new returnValueType(false);
                        }

                        // set impededLast to decision[customers]
                        problem.get("impededLast").clear();
                        problem.get("impededLast").addAll(decision.get("customers"));

                        executor.outFields["decision"] = decision;
                        logger.trace("-- decision: " + decision);

                        logger.info("vpnsla: sla balance, impeding customers " + decision.get("customers"));

                        logger.trace("finished: " + executor.subject.id);
                        logger.debug(".d-sla");

Logic: Decide Priority
----------------------

         .. container:: sect2

            .. container:: listingblock

               .. container:: content

                  .. code:: CodeRay

                     /*
                      * ============LICENSE_START=======================================================
                      *  Copyright (C) 2016-2018 Ericsson. All rights reserved.
                      * ================================================================================
                      * Licensed under the Apache License, Version 2.0 (the "License");
                      * you may not use this file except in compliance with the License.
                      * You may obtain a copy of the License at
                      *
                      *      http://www.apache.org/licenses/LICENSE-2.0
                      *
                      * Unless required by applicable law or agreed to in writing, software
                      * distributed under the License is distributed on an "AS IS" BASIS,
                      * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
                      * See the License for the specific language governing permissions and
                      * limitations under the License.
                      *
                      * SPDX-License-Identifier: Apache-2.0
                      * ============LICENSE_END=========================================================
                      */

                     load("nashorn:mozilla_compat.js");
                     importClass(org.slf4j.LoggerFactory);

                     importClass(java.util.ArrayList);

                     importClass(org.apache.avro.generic.GenericData.Array);
                     importClass(org.apache.avro.generic.GenericRecord);
                     importClass(org.apache.avro.Schema);

                     var logger = executor.logger;
                     logger.trace("start: " + executor.subject.id);
                     logger.trace("-- infields: " + executor.inFields);

                     var rootLogger = LoggerFactory.getLogger(logger.ROOT_LOGGER_NAME);

                     var ifSituation = executor.inFields["situation"];

                     var albumCustomerMap = executor.getContextAlbum("albumCustomerMap");
                     var albumProblemMap = executor.getContextAlbum("albumProblemMap");

                     // create outfiled for decision
                     var decision = executor.subject.getOutFieldSchemaHelper("decision").createNewInstance();
                     decision.put("description", "None, everything is ok");
                     decision.put("decision", "IMPEDE");
                     decision.put("problemID", ifSituation.get("problemID"));
                     decision.put("customers", new ArrayList());

                     var problem = albumProblemMap.get(ifSituation.get("problemID"));
                     var returnValueType = Java.type("java.lang.Boolean");
                     if (problem != null && ifSituation.get("violatedSLAs").size() > 0) {
                         logger.trace("-- impede by priority");
                         for (var i = 0; i < problem.get("edgeUsedBy").size(); i++) {
                             customerCtxt = albumCustomerMap.get(problem.get("edgeUsedBy").get(i).toString());
                             if (customerCtxt.get("priority") == false) {
                                 decision.get("customers").add(customerCtxt.get("customerName"));
                             }
                         }
                         var returnValue = new returnValueType(true);
                     } else {
                         logger.trace("-- wrong problemID <" + ifSituation.get("problemID") + "> for PRIORITY task, we should not be here");
                         rootLogger.error(executor.subject.id + " " + "-- wrong problemID <" + ifSituation.get("problemID")
                                 + "> for PRIORITY task, we should not be here");
                         var returnValue = new returnValueType(false);
                     }

                     // set impededLast to decision[customers]
                     problem.get("impededLast").clear();
                     problem.get("impededLast").addAll(decision.get("customers"));

                     executor.outFields["decision"] = decision;
                     logger.trace("-- decision: " + decision);

                     logger.info("vpnsla: priority, impeding customers " + decision.get("customers"));

                     logger.trace("finished: " + executor.subject.id);
                     logger.debug(".d-pri");

Logic: Policy Act State
------------------------

         .. container:: sect1

            .. container:: sectionbody

               .. container:: paragraph

                  This is the logic for the act state. It is simply
                  selecting an action, and creating the repsonse event
                  for the orchestrator (the output of the policy).

               .. container:: listingblock

                  .. container:: content

                     .. code:: CodeRay

                        /*
                         * ============LICENSE_START=======================================================
                         *  Copyright (C) 2016-2018 Ericsson. All rights reserved.
                         * ================================================================================
                         * Licensed under the Apache License, Version 2.0 (the "License");
                         * you may not use this file except in compliance with the License.
                         * You may obtain a copy of the License at
                         *
                         *      http://www.apache.org/licenses/LICENSE-2.0
                         *
                         * Unless required by applicable law or agreed to in writing, software
                         * distributed under the License is distributed on an "AS IS" BASIS,
                         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
                         * See the License for the specific language governing permissions and
                         * limitations under the License.
                         *
                         * SPDX-License-Identifier: Apache-2.0
                         * ============LICENSE_END=========================================================
                         */

                        load("nashorn:mozilla_compat.js");

                        var logger = executor.logger;
                        logger.trace("start: " + executor.subject.id);
                        logger.trace("-- infields: " + executor.inFields);

                        var ifDecision = executor.inFields["decision"];
                        var ifMatchStart = executor.inFields["matchStart"];

                        var albumCustomerMap = executor.getContextAlbum("albumCustomerMap");
                        var albumProblemMap = executor.getContextAlbum("albumProblemMap");

                        switch (ifDecision.get("decision").toString()) {
                        case "NONE":
                            executor.outFields["edgeName"] = "";
                            executor.outFields["action"] = "";
                            break;
                        case "IMPEDE":
                            for (var i = 0; i < ifDecision.get("customers").size(); i++) {
                                customer = albumCustomerMap.get(ifDecision.get("customers").get(i).toString());
                                executor.outFields["edgeName"] = customer.get("links").get(0);
                                executor.outFields["action"] = "firewall";
                            }
                            break;
                        case "REBUILD":
                            // finally solved, remove problem
                            albumProblemMap.remove(ifDecision.get("problemID"));
                            executor.outFields["edgeName"] = "L10"; // this is ###static###
                            executor.outFields["action"] = "rebuild"; // this is ###static###
                            break;
                        default:

                        }

                        var returnValueType = Java.type("java.lang.Boolean");
                        var returnValue = new returnValueType(true);

                        if (executor.outFields["action"] != "") {
                            logger.info("vpnsla: action is to " + executor.outFields["action"] + " " + executor.outFields["edgeName"]);
                        } else {
                            logger.info("vpnsla: no action required");
                        }

                        logger.trace("-- outfields: " + executor.outFields);
                        logger.trace("finished: " + executor.subject.id);
                        logger.debug(".a");

                        var now = new Date().getTime();
                        logger.info("VPN SLA finished in " + (now - ifMatchStart) + " ms");

CLI Spec
--------

         .. container:: sect1

            .. rubric:: Complete Policy Definition
               :name: complete_policy_definition

            .. container:: sectionbody

               .. container:: paragraph

                  The complete policy definition is realized using the
                  APEX CLI Editor. The script below shows the actual
                  policy specification. All logic and schemas are
                  included (as macro file).

               .. container:: listingblock

                  .. container:: content

                     .. code:: CodeRay

                        #-------------------------------------------------------------------------------
                        # ============LICENSE_START=======================================================
                        #  Copyright (C) 2016-2018 Ericsson. All rights reserved.
                        # ================================================================================
                        # Licensed under the Apache License, Version 2.0 (the "License");
                        # you may not use this file except in compliance with the License.
                        # You may obtain a copy of the License at
                        #
                        #      http://www.apache.org/licenses/LICENSE-2.0
                        #
                        # Unless required by applicable law or agreed to in writing, software
                        # distributed under the License is distributed on an "AS IS" BASIS,
                        # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
                        # See the License for the specific language governing permissions and
                        # limitations under the License.
                        #
                        # SPDX-License-Identifier: Apache-2.0
                        # ============LICENSE_END=========================================================
                        #-------------------------------------------------------------------------------

                        # ============LICENSE_START=======================================================
                        #  Copyright (C) 2016-2018 Ericsson. All rights reserved.
                        # ================================================================================
                        # Licensed under the Apache License, Version 2.0 (the "License");
                        # you may not use this file except in compliance with the License.
                        # You may obtain a copy of the License at
                        #
                        #      http://www.apache.org/licenses/LICENSE-2.0
                        #
                        # Unless required by applicable law or agreed to in writing, software
                        # distributed under the License is distributed on an "AS IS" BASIS,
                        # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
                        # See the License for the specific language governing permissions and
                        # limitations under the License.
                        #
                        # SPDX-License-Identifier: Apache-2.0
                        # ============LICENSE_END=========================================================

                        model create name=PCVS-VpnSla version=1.0.0 description="Policies-Controlled Video Streaming, VPN SLA Policy Model"



                        schema create name=reportDecl version=1.0.0 description="Report of activities of a policy/task" flavour=Java schema=java.lang.String
                        event create name=ReportOut version=1.0.0 description="Report of a policy (issued by a task)" nameSpace=org.onap.policy.apex.examples.pcvs.vpnsla source="APEX" target="CtxtManagement"
                        event parameter create name=ReportOut version=1.0.0 parName=report schemaName=reportDecl schemaVersion=1.0.0

                        schema create name=timestampDecl version=1.0.0 description="Timestamp" flavour=Java schema=java.lang.Long



                        schema create name=ctxtEdgeNameDecl version=1.0.0 description="Topology Edges: edge (link) name" flavour=Java schema=java.lang.String
                        schema create name=ctxtEdgeStartDecl version=1.0.0 description="Topology Edges: edge endpoint (start)" flavour=Java schema=java.lang.String
                        schema create name=ctxtEdgeEndDecl version=1.0.0 description="Topology Edges: edge endpoint (end)" flavour=Java schema=java.lang.String
                        schema create name=ctxtEdgeStatusDecl version=1.0.0 description="Topology Edges: edge status as up (true) or down (false)" flavour=Java schema=java.lang.Boolean

                        schema create name=ctxtTopologyEdgesDecl version=1.0.0 description="Topology Edges Context Map" flavour=Avro schema=LS
                        #MACROFILE:"src/main/resources/org/onap/policy/apex/examples/pcvs/vpnsla/avro/topology-edges.avsc"
                        LE
                        album create name=albumTopoEdges scope=global writable=true schemaName=ctxtTopologyEdgesDecl


                        task create name=EdgeContextTask version=1.0.0 description="This task adds event context to edge context"
                        task inputfield create name=EdgeContextTask version=1.0.0 fieldName=edgeName schemaName=ctxtEdgeNameDecl schemaVersion=1.0.0
                        task inputfield create name=EdgeContextTask version=1.0.0 fieldName=start schemaName=ctxtEdgeStartDecl schemaVersion=1.0.0
                        task inputfield create name=EdgeContextTask version=1.0.0 fieldName=end schemaName=ctxtEdgeEndDecl schemaVersion=1.0.0
                        task inputfield create name=EdgeContextTask version=1.0.0 fieldName=status schemaName=ctxtEdgeStatusDecl schemaVersion=1.0.0
                        task outputfield create name=EdgeContextTask version=1.0.0 fieldName=report schemaName=reportDecl schemaVersion=1.0.0
                        task contextref create name=EdgeContextTask albumName=albumTopoEdges
                        task logic create name=EdgeContextTask logicFlavour=JAVASCRIPT logic=LS
                        #MACROFILE:"src/main/resources/org/onap/policy/apex/examples/pcvs/vpnsla/logic/ctxt-edges.js"
                        LE

                        event create name=EdgeContextEventIn version=1.0.0 description="Event to add an Edge to engine Context" nameSpace=org.onap.policy.apex.examples.pcvs.vpnsla source="CtxtManagement" target="APEX"
                        event parameter create name=EdgeContextEventIn version=1.0.0 parName=edgeName schemaName=ctxtEdgeNameDecl schemaVersion=1.0.0
                        event parameter create name=EdgeContextEventIn version=1.0.0 parName=start schemaName=ctxtEdgeStartDecl schemaVersion=1.0.0
                        event parameter create name=EdgeContextEventIn version=1.0.0 parName=end schemaName=ctxtEdgeEndDecl schemaVersion=1.0.0
                        event parameter create name=EdgeContextEventIn version=1.0.0 parName=status schemaName=ctxtEdgeStatusDecl schemaVersion=1.0.0

                        policy create name=EdgeContextPolicy version=1.0.0 description="Policy that adds an edge to context" template=FREEFORM firstState=EdgeContextState
                        policy state create name=EdgeContextPolicy version=1.0.0 stateName=EdgeContextState triggerName=EdgeContextEventIn triggerVersion=1.0.0 defaultTaskName=EdgeContextTask defaultTaskVersion=1.0.0
                        policy state output create name=EdgeContextPolicy version=1.0.0 stateName=EdgeContextState outputName=EdgeContextState_Output_Direct eventName=ReportOut eventVersion=1.0.0 nextState=NULL
                        policy state taskref create name=EdgeContextPolicy version=1.0.0 stateName=EdgeContextState taskLocalName=doContext taskName=EdgeContextTask taskVersion=1.0.0 outputType=DIRECT outputName=EdgeContextState_Output_Direct



                        schema create name=ctxtNodeNameDecl version=1.0.0 description="Topology Nodes: node name" flavour=Java schema=java.lang.String
                        schema create name=ctxtNodeMininetNameDecl version=1.0.0 description="Topology Nodes: node name in Mininet" flavour=Java schema=java.lang.String

                        schema create name=ctxtTopologyNodesDecl version=1.0.0 description="Topology Nodes Context Map" flavour=Avro schema=LS
                        #MACROFILE:"src/main/resources/org/onap/policy/apex/examples/pcvs/vpnsla/avro/topology-nodes.avsc"
                        LE
                        album create name=albumTopoNodes scope=global writable=true schemaName=ctxtTopologyNodesDecl

                        task create name=NodeContextTask version=1.0.0 description="This task adds event context to node context"
                        task inputfield create name=NodeContextTask version=1.0.0 fieldName=nodeName schemaName=ctxtNodeNameDecl schemaVersion=1.0.0
                        task inputfield create name=NodeContextTask version=1.0.0 fieldName=mininetName schemaName=ctxtNodeMininetNameDecl schemaVersion=1.0.0
                        task outputfield create name=NodeContextTask version=1.0.0 fieldName=report schemaName=reportDecl schemaVersion=1.0.0
                        task contextref create name=NodeContextTask albumName=albumTopoNodes
                        task logic create name=NodeContextTask logicFlavour=JAVASCRIPT logic=LS
                        #MACROFILE:"src/main/resources/org/onap/policy/apex/examples/pcvs/vpnsla/logic/ctxt-nodes.js"
                        LE

                        event create name=NodeContextEventIn version=1.0.0 description="Event to add Node to engine Context" nameSpace=org.onap.policy.apex.examples.pcvs.vpnsla source="CtxtManagement" target="APEX"
                        event parameter create name=NodeContextEventIn version=1.0.0 parName=nodeName schemaName=ctxtNodeNameDecl schemaVersion=1.0.0
                        event parameter create name=NodeContextEventIn version=1.0.0 parName=mininetName schemaName=ctxtNodeMininetNameDecl schemaVersion=1.0.0

                        policy create name=NodeContextPolicy version=1.0.0 description="Policy that adds an node to context" template=FREEFORM firstState=NodeContextState
                        policy state create name=NodeContextPolicy version=1.0.0 stateName=NodeContextState triggerName=NodeContextEventIn triggerVersion=1.0.0 defaultTaskName=NodeContextTask defaultTaskVersion=1.0.0
                        policy state output create name=NodeContextPolicy version=1.0.0 stateName=NodeContextState outputName=NodeContextState_Output_Direct eventName=ReportOut eventVersion=1.0.0 nextState=NULL
                        policy state taskref create name=NodeContextPolicy version=1.0.0 stateName=NodeContextState taskLocalName=doContext taskName=NodeContextTask taskVersion=1.0.0 outputType=DIRECT outputName=NodeContextState_Output_Direct




                        schema create name=ctxtCustomerNameDecl version=1.0.0 description="Customer Context: customer name" flavour=Java schema=java.lang.String
                        schema create name=ctxtCustomerPriorityDecl version=1.0.0 description="Customer Context: priority flag" flavour=Java schema=java.lang.Boolean
                        schema create name=ctxtCustomerSatisfactionDecl version=1.0.0 description="Customer Context: satisfaction in percent" flavour=Java schema=java.lang.Integer
                        schema create name=ctxtCustomerDowntimeSLADecl version=1.0.0 description="Customer Context: contracted downtime as per SLA" flavour=Java schema=java.lang.Integer
                        schema create name=ctxtCustomerDowntimeYTDDecl version=1.0.0 description="Customer Context: year-to-date downtime experienced" flavour=Java schema=java.lang.Integer
                        schema create name=ctxtCustomerLinksDecl version=1.0.0 description="Customer Context: links a customer uses (for events/task)" flavour=Java schema=java.lang.String

                        schema create name=ctxtCustomerMapDecl version=1.0.0 description="Map of customers with all known information" flavour=Avro schema=LS
                        #MACROFILE:"src/main/resources/org/onap/policy/apex/examples/pcvs/vpnsla/avro/customers.avsc"
                        LE
                        album create name=albumCustomerMap scope=global writable=true schemaName=ctxtCustomerMapDecl

                        task create name=CustomerContextTask version=1.0.0 description="This task adds event context to customer context"
                        task inputfield create name=CustomerContextTask version=1.0.0 fieldName=customerName schemaName=ctxtCustomerNameDecl schemaVersion=1.0.0
                        task inputfield create name=CustomerContextTask version=1.0.0 fieldName=priority schemaName=ctxtCustomerPriorityDecl schemaVersion=1.0.0
                        task inputfield create name=CustomerContextTask version=1.0.0 fieldName=satisfaction schemaName=ctxtCustomerSatisfactionDecl schemaVersion=1.0.0
                        task inputfield create name=CustomerContextTask version=1.0.0 fieldName=dtSLA schemaName=ctxtCustomerDowntimeSLADecl schemaVersion=1.0.0
                        task inputfield create name=CustomerContextTask version=1.0.0 fieldName=dtYTD schemaName=ctxtCustomerDowntimeYTDDecl schemaVersion=1.0.0
                        task inputfield create name=CustomerContextTask version=1.0.0 fieldName=links schemaName=ctxtCustomerLinksDecl schemaVersion=1.0.0
                        task outputfield create name=CustomerContextTask version=1.0.0 fieldName=report schemaName=reportDecl schemaVersion=1.0.0
                        task contextref create name=CustomerContextTask albumName=albumCustomerMap
                        task contextref create name=CustomerContextTask albumName=albumTopoEdges
                        task logic create name=CustomerContextTask logicFlavour=JAVASCRIPT logic=LS
                        #MACROFILE:"src/main/resources/org/onap/policy/apex/examples/pcvs/vpnsla/logic/ctxt-customer.js"
                        LE

                        event create name=CustomerContextEventIn version=1.0.0 description="Event to add Customers to engine Context" nameSpace=org.onap.policy.apex.examples.pcvs.vpnsla source="CtxtManagement" target="APEX"
                        event parameter create name=CustomerContextEventIn version=1.0.0 parName=customerName schemaName=ctxtCustomerNameDecl schemaVersion=1.0.0
                        event parameter create name=CustomerContextEventIn version=1.0.0 parName=priority schemaName=ctxtCustomerPriorityDecl schemaVersion=1.0.0
                        event parameter create name=CustomerContextEventIn version=1.0.0 parName=satisfaction schemaName=ctxtCustomerSatisfactionDecl schemaVersion=1.0.0
                        event parameter create name=CustomerContextEventIn version=1.0.0 parName=dtSLA schemaName=ctxtCustomerDowntimeSLADecl schemaVersion=1.0.0
                        event parameter create name=CustomerContextEventIn version=1.0.0 parName=dtYTD schemaName=ctxtCustomerDowntimeYTDDecl schemaVersion=1.0.0
                        event parameter create name=CustomerContextEventIn version=1.0.0 parName=links schemaName=ctxtCustomerLinksDecl schemaVersion=1.0.0

                        policy create name=CustomerContextPolicy version=1.0.0 description="Policy that adds Customer information to engine context" template=FREEFORM firstState=CustomerContextState
                        policy state create name=CustomerContextPolicy version=1.0.0 stateName=CustomerContextState triggerName=CustomerContextEventIn triggerVersion=1.0.0 defaultTaskName=CustomerContextTask defaultTaskVersion=1.0.0
                        policy state output create name=CustomerContextPolicy version=1.0.0 stateName=CustomerContextState outputName=CustomerContextState_Output_Direct eventName=ReportOut eventVersion=1.0.0 nextState=NULL
                        policy state taskref create name=CustomerContextPolicy version=1.0.0 stateName=CustomerContextState taskLocalName=doContext taskName=CustomerContextTask taskVersion=1.0.0 outputType=DIRECT outputName=CustomerContextState_Output_Direct




                        schema create name=edgeNameDecl version=1.0.0 description="Edge name" flavour=Java schema=java.lang.String
                        schema create name=edgeStatusDecl version=1.0.0 description="Statuf of the edge (UP, DOWN)" flavour=Avro schema=LS
                        #MACROFILE:"src/main/resources/org/onap/policy/apex/examples/pcvs/vpnsla/avro/link-status.avsc"
                        LE
                        schema create name=edgeChangedDecl version=1.0.0 description="Status Change (true:change, false:no change)" flavour=Java schema=java.lang.Boolean

                        task create name=VpnSlaPolicyMatchTask version=1.0.0 description="Pre-process an edge event"
                        task inputfield create name=VpnSlaPolicyMatchTask version=1.0.0 fieldName=edgeName schemaName=edgeNameDecl schemaVersion=1.0.0
                        task inputfield create name=VpnSlaPolicyMatchTask version=1.0.0 fieldName=status schemaName=edgeStatusDecl schemaVersion=1.0.0
                        task outputfield create name=VpnSlaPolicyMatchTask version=1.0.0 fieldName=edgeName schemaName=edgeNameDecl schemaVersion=1.0.0
                        task outputfield create name=VpnSlaPolicyMatchTask version=1.0.0 fieldName=status schemaName=edgeStatusDecl schemaVersion=1.0.0
                        task outputfield create name=VpnSlaPolicyMatchTask version=1.0.0 fieldName=hasChanged schemaName=edgeChangedDecl schemaVersion=1.0.0
                        task outputfield create name=VpnSlaPolicyMatchTask version=1.0.0 fieldName=matchStart schemaName=timestampDecl schemaVersion=1.0.0
                        task contextref create name=VpnSlaPolicyMatchTask albumName=albumTopoEdges
                        task logic create name=VpnSlaPolicyMatchTask logicFlavour=JAVASCRIPT logic=LS
                        #MACROFILE:"src/main/resources/org/onap/policy/apex/examples/pcvs/vpnsla/logic/task-match.js"
                        LE




                        schema create name=problemMapDecl version=1.0.0 description="Map of problems with all known Information" flavour=Avro schema=LS
                        #MACROFILE:"src/main/resources/org/onap/policy/apex/examples/pcvs/vpnsla/avro/problems.avsc"
                        LE
                        album create name=albumProblemMap scope=global writable=true schemaName=problemMapDecl

                        schema create name=establishSituationDecl version=1.0.0 description="Establish: the situation that was established" flavour=Avro schema=LS
                        #MACROFILE:"src/main/resources/org/onap/policy/apex/examples/pcvs/vpnsla/avro/situation.avsc"
                        LE

                        task create name=VpnSlaPolicyEstablishTask version=1.0.0 description="Task taking a match event and establishing a situation"
                        task inputfield create name=VpnSlaPolicyEstablishTask version=1.0.0 fieldName=edgeName schemaName=edgeNameDecl schemaVersion=1.0.0
                        task inputfield create name=VpnSlaPolicyEstablishTask version=1.0.0 fieldName=status schemaName=edgeStatusDecl schemaVersion=1.0.0
                        task inputfield create name=VpnSlaPolicyEstablishTask version=1.0.0 fieldName=hasChanged schemaName=edgeChangedDecl schemaVersion=1.0.0
                        task inputfield create name=VpnSlaPolicyEstablishTask version=1.0.0 fieldName=matchStart schemaName=timestampDecl schemaVersion=1.0.0
                        task outputfield create name=VpnSlaPolicyEstablishTask version=1.0.0 fieldName=situation schemaName=establishSituationDecl schemaVersion=1.0.0
                        task outputfield create name=VpnSlaPolicyEstablishTask version=1.0.0 fieldName=matchStart schemaName=timestampDecl schemaVersion=1.0.0
                        task contextref create name=VpnSlaPolicyEstablishTask albumName=albumProblemMap
                        task contextref create name=VpnSlaPolicyEstablishTask albumName=albumCustomerMap
                        task logic create name=VpnSlaPolicyEstablishTask logicFlavour=JAVASCRIPT logic=LS
                        #MACROFILE:"src/main/resources/org/onap/policy/apex/examples/pcvs/vpnsla/logic/task-establish.js"
                        LE




                        schema create name=decideDecisionDecl version=1.0.0 description="Decide: the taken decision" flavour=Avro schema=LS
                        #MACROFILE:"src/main/resources/org/onap/policy/apex/examples/pcvs/vpnsla/avro/decision.avsc"
                        LE

                        task create name=VpnSlaPolicyDecideNoneTask version=1.0.0 description="Decide task for a 'none' problem"
                        task inputfield create name=VpnSlaPolicyDecideNoneTask version=1.0.0 fieldName=situation schemaName=establishSituationDecl schemaVersion=1.0.0
                        task inputfield create name=VpnSlaPolicyDecideNoneTask version=1.0.0 fieldName=matchStart schemaName=timestampDecl schemaVersion=1.0.0
                        task outputfield create name=VpnSlaPolicyDecideNoneTask version=1.0.0 fieldName=decision schemaName=decideDecisionDecl schemaVersion=1.0.0
                        task outputfield create name=VpnSlaPolicyDecideNoneTask version=1.0.0 fieldName=matchStart schemaName=timestampDecl schemaVersion=1.0.0
                        task logic create name=VpnSlaPolicyDecideNoneTask logicFlavour=JAVASCRIPT logic=LS
                        #MACROFILE:"src/main/resources/org/onap/policy/apex/examples/pcvs/vpnsla/logic/task-decide-none.js"
                        LE


                        task create name=VpnSlaPolicyDecideSlaTask version=1.0.0 description="Decide task solving the problem by balancing SLAs"
                        task inputfield create name=VpnSlaPolicyDecideSlaTask version=1.0.0 fieldName=situation schemaName=establishSituationDecl schemaVersion=1.0.0
                        task inputfield create name=VpnSlaPolicyDecideSlaTask version=1.0.0 fieldName=matchStart schemaName=timestampDecl schemaVersion=1.0.0
                        task outputfield create name=VpnSlaPolicyDecideSlaTask version=1.0.0 fieldName=decision schemaName=decideDecisionDecl schemaVersion=1.0.0
                        task outputfield create name=VpnSlaPolicyDecideSlaTask version=1.0.0 fieldName=matchStart schemaName=timestampDecl schemaVersion=1.0.0
                        task contextref create name=VpnSlaPolicyDecideSlaTask albumName=albumCustomerMap
                        task contextref create name=VpnSlaPolicyDecideSlaTask albumName=albumProblemMap
                        task logic create name=VpnSlaPolicyDecideSlaTask logicFlavour=JAVASCRIPT logic=LS
                        #MACROFILE:"src/main/resources/org/onap/policy/apex/examples/pcvs/vpnsla/logic/task-decide-sla.js"
                        LE


                        task create name=VpnSlaPolicyDecidePriorityTask version=1.0.0 description="Decide task solving the problem by using customer priorities"
                        task inputfield create name=VpnSlaPolicyDecidePriorityTask version=1.0.0 fieldName=situation schemaName=establishSituationDecl schemaVersion=1.0.0
                        task inputfield create name=VpnSlaPolicyDecidePriorityTask version=1.0.0 fieldName=matchStart schemaName=timestampDecl schemaVersion=1.0.0
                        task outputfield create name=VpnSlaPolicyDecidePriorityTask version=1.0.0 fieldName=decision schemaName=decideDecisionDecl schemaVersion=1.0.0
                        task outputfield create name=VpnSlaPolicyDecidePriorityTask version=1.0.0 fieldName=matchStart schemaName=timestampDecl schemaVersion=1.0.0
                        task contextref create name=VpnSlaPolicyDecidePriorityTask albumName=albumCustomerMap
                        task contextref create name=VpnSlaPolicyDecidePriorityTask albumName=albumProblemMap
                        task logic create name=VpnSlaPolicyDecidePriorityTask logicFlavour=JAVASCRIPT logic=LS
                        #MACROFILE:"src/main/resources/org/onap/policy/apex/examples/pcvs/vpnsla/logic/task-decide-priority.js"
                        LE


                        task create name=VpnSlaPolicyDecideSolvedTask version=1.0.0 description="Decide task solving the problem by using customer priorities"
                        task inputfield create name=VpnSlaPolicyDecideSolvedTask version=1.0.0 fieldName=situation schemaName=establishSituationDecl schemaVersion=1.0.0
                        task inputfield create name=VpnSlaPolicyDecideSolvedTask version=1.0.0 fieldName=matchStart schemaName=timestampDecl schemaVersion=1.0.0
                        task outputfield create name=VpnSlaPolicyDecideSolvedTask version=1.0.0 fieldName=decision schemaName=decideDecisionDecl schemaVersion=1.0.0
                        task outputfield create name=VpnSlaPolicyDecideSolvedTask version=1.0.0 fieldName=matchStart schemaName=timestampDecl schemaVersion=1.0.0
                        task contextref create name=VpnSlaPolicyDecideSolvedTask albumName=albumProblemMap
                        task logic create name=VpnSlaPolicyDecideSolvedTask logicFlavour=JAVASCRIPT logic=LS
                        #MACROFILE:"src/main/resources/org/onap/policy/apex/examples/pcvs/vpnsla/logic/task-decide-solved.js"
                        LE




                        schema create name=actionDecl version=1.0.0 description="An action for the actioning system" flavour=Java schema=java.lang.String

                        task create name=VpnSlaPolicyActTask version=1.0.0 description="Task issueing an action for taken decision"
                        task inputfield create name=VpnSlaPolicyActTask version=1.0.0 fieldName=decision schemaName=decideDecisionDecl schemaVersion=1.0.0
                        task inputfield create name=VpnSlaPolicyActTask version=1.0.0 fieldName=matchStart schemaName=timestampDecl schemaVersion=1.0.0
                        task outputfield create name=VpnSlaPolicyActTask version=1.0.0 fieldName=edgeName schemaName=edgeNameDecl schemaVersion=1.0.0
                        task outputfield create name=VpnSlaPolicyActTask version=1.0.0 fieldName=action schemaName=actionDecl schemaVersion=1.0.0
                        task contextref create name=VpnSlaPolicyActTask albumName=albumCustomerMap
                        task contextref create name=VpnSlaPolicyActTask albumName=albumProblemMap
                        task logic create name=VpnSlaPolicyActTask logicFlavour=JAVASCRIPT logic=LS
                        #MACROFILE:"src/main/resources/org/onap/policy/apex/examples/pcvs/vpnsla/logic/task-act.js"
                        LE







                        event create name=VpnSlaTrigger version=1.0.0 description="Event triggering the VPN SLA policy" nameSpace=org.onap.policy.apex.examples.pcvs.vpnsla source="TriggerSys" target="VpnSlaMatch"
                        event parameter create name=VpnSlaTrigger version=1.0.0 parName=edgeName schemaName=edgeNameDecl schemaVersion=1.0.0
                        event parameter create name=VpnSlaTrigger version=1.0.0 parName=status schemaName=edgeStatusDecl schemaVersion=1.0.0

                        event create name=VpnSlaMatchOut version=1.0.0 description="Event with matched trigger for the VPN SLA policy" nameSpace=org.onap.policy.apex.examples.pcvs.vpnsla source="VpnSlaMatch" target="VpnSlaEstablish"
                        event parameter create name=VpnSlaMatchOut version=1.0.0 parName=edgeName schemaName=edgeNameDecl schemaVersion=1.0.0
                        event parameter create name=VpnSlaMatchOut version=1.0.0 parName=status schemaName=edgeStatusDecl schemaVersion=1.0.0
                        event parameter create name=VpnSlaMatchOut version=1.0.0 parName=hasChanged schemaName=edgeChangedDecl schemaVersion=1.0.0
                        event parameter create name=VpnSlaMatchOut version=1.0.0 parName=matchStart schemaName=timestampDecl schemaVersion=1.0.0

                        event create name=VpnSlaEstablishOut version=1.0.0 description="Event with situation for the SLA policy" nameSpace=org.onap.policy.apex.examples.pcvs.vpnsla source="SlaEstablish" target="SlaDecide"
                        event parameter create name=VpnSlaEstablishOut version=1.0.0 parName=situation schemaName=establishSituationDecl schemaVersion=1.0.0
                        event parameter create name=VpnSlaEstablishOut version=1.0.0 parName=matchStart schemaName=timestampDecl schemaVersion=1.0.0

                        event create name=VpnSlaDecideOut version=1.0.0 description="Event with a decision for the SLA policy" nameSpace=org.onap.policy.apex.examples.pcvs.vpnsla source="SlaDecide" target="SlaAct"
                        event parameter create name=VpnSlaDecideOut version=1.0.0 parName=decision schemaName=decideDecisionDecl schemaVersion=1.0.0
                        event parameter create name=VpnSlaDecideOut version=1.0.0 parName=matchStart schemaName=timestampDecl schemaVersion=1.0.0

                        event create name=VpnSlaActOut version=1.0.0 description="Event action" nameSpace=org.onap.policy.apex.examples.pcvs.vpnsla source="SlaAct" target="ActioningSystem"
                        event parameter create name=VpnSlaActOut version=1.0.0 parName=edgeName schemaName=edgeNameDecl schemaVersion=1.0.0
                        event parameter create name=VpnSlaActOut version=1.0.0 parName=action schemaName=actionDecl schemaVersion=1.0.0


                        policy create name=VpnSlaPolicy version=1.0.0 description="Policy deciding customer treatment based on SLAs as MEDA policy" template=FREEFORM firstState=VpnSlaPolicyMatchState

                        policy state create name=VpnSlaPolicy version=1.0.0 stateName=VpnSlaPolicyActState triggerName=VpnSlaDecideOut triggerVersion=1.0.0 defaultTaskName=VpnSlaPolicyActTask defaultTaskVersion=1.0.0
                        policy state output create name=VpnSlaPolicy version=1.0.0 stateName=VpnSlaPolicyActState outputName=SlaPolicyAct_Output_Direct eventName=VpnSlaActOut eventVersion=1.0.0 nextState=NULL
                        policy state taskref create name=VpnSlaPolicy version=1.0.0 stateName=VpnSlaPolicyActState taskLocalName=act taskName=VpnSlaPolicyActTask taskVersion=1.0.0 outputType=DIRECT outputName=SlaPolicyAct_Output_Direct

                        policy state create name=VpnSlaPolicy version=1.0.0 stateName=VpnSlaPolicyDecideState triggerName=VpnSlaEstablishOut triggerVersion=1.0.0 defaultTaskName=VpnSlaPolicyDecideSlaTask defaultTaskVersion=1.0.0
                        policy state contextref create name=VpnSlaPolicy version=1.0.0 stateName=VpnSlaPolicyDecideState albumName=albumProblemMap
                        policy state selecttasklogic create name=VpnSlaPolicy stateName=VpnSlaPolicyDecideState logicFlavour=JAVASCRIPT logic=LS
                        #MACROFILE:"src/main/resources/org/onap/policy/apex/examples/pcvs/vpnsla/logic/tsl-decide.js"
                        LE
                        policy state output create name=VpnSlaPolicy version=1.0.0 stateName=VpnSlaPolicyDecideState outputName=VpnSlaPolicyDecide_Output_Direct eventName=VpnSlaDecideOut eventVersion=1.0.0 nextState=VpnSlaPolicyActState
                        policy state taskref create name=VpnSlaPolicy version=1.0.0 stateName=VpnSlaPolicyDecideState taskLocalName=decideNone taskName=VpnSlaPolicyDecideNoneTask taskVersion=1.0.0 outputType=DIRECT outputName=VpnSlaPolicyDecide_Output_Direct
                        policy state taskref create name=VpnSlaPolicy version=1.0.0 stateName=VpnSlaPolicyDecideState taskLocalName=decideNone taskName=VpnSlaPolicyDecideSolvedTask taskVersion=1.0.0 outputType=DIRECT outputName=VpnSlaPolicyDecide_Output_Direct
                        policy state taskref create name=VpnSlaPolicy version=1.0.0 stateName=VpnSlaPolicyDecideState taskLocalName=decideSla taskName=VpnSlaPolicyDecideSlaTask taskVersion=1.0.0 outputType=DIRECT outputName=VpnSlaPolicyDecide_Output_Direct
                        policy state taskref create name=VpnSlaPolicy version=1.0.0 stateName=VpnSlaPolicyDecideState taskLocalName=decidePriority taskName=VpnSlaPolicyDecidePriorityTask taskVersion=1.0.0 outputType=DIRECT outputName=VpnSlaPolicyDecide_Output_Direct

                        policy state create name=VpnSlaPolicy version=1.0.0 stateName=VpmSlaPolicyEstablishState triggerName=VpnSlaMatchOut triggerVersion=1.0.0 defaultTaskName=VpnSlaPolicyEstablishTask defaultTaskVersion=1.0.0
                        policy state output create name=VpnSlaPolicy version=1.0.0 stateName=VpmSlaPolicyEstablishState outputName=VpnSlaPolicyEstablish_Output_Direct eventName=VpnSlaEstablishOut eventVersion=1.0.0 nextState=VpnSlaPolicyDecideState
                        policy state taskref create name=VpnSlaPolicy version=1.0.0 stateName=VpmSlaPolicyEstablishState taskLocalName=establish taskName=VpnSlaPolicyEstablishTask taskVersion=1.0.0 outputType=DIRECT outputName=VpnSlaPolicyEstablish_Output_Direct

                        policy state create name=VpnSlaPolicy version=1.0.0 stateName=VpnSlaPolicyMatchState triggerName=VpnSlaTrigger triggerVersion=1.0.0 defaultTaskName=VpnSlaPolicyMatchTask defaultTaskVersion=1.0.0
                        policy state output create name=VpnSlaPolicy version=1.0.0 stateName=VpnSlaPolicyMatchState outputName=VpnSlaPolicyMatch_Output_Direct eventName=VpnSlaMatchOut eventVersion=1.0.0 nextState=VpmSlaPolicyEstablishState
                        policy state taskref create name=VpnSlaPolicy version=1.0.0 stateName=VpnSlaPolicyMatchState taskLocalName=match taskName=VpnSlaPolicyMatchTask taskVersion=1.0.0 outputType=DIRECT outputName=VpnSlaPolicyMatch_Output_Direct



                        validate
                        quit

Context Events Nodes
--------------------

         .. container:: sect1

            .. container:: sectionbody

               .. container:: paragraph

                  The following events create all nodes of the topology.

               .. container:: listingblock

                  .. container:: content

                     .. code:: CodeRay

                        {
                            "nameSpace": "org.onap.policy.apex.examples.pcvs.vpnsla",
                            "name": "NodeContextEventIn",
                            "version": "1.0.0",
                            "source": "CtxtManagement",
                            "target" : "VpnSlaPolicy_NodeContext",
                            "nodeName": "A1",
                            "mininetName": "nn"
                        }

                        {
                            "nameSpace": "org.onap.policy.apex.examples.pcvs.vpnsla",
                            "name": "NodeContextEventIn",
                            "version": "1.0.0",
                            "source": "CtxtManagement",
                            "target" : "VpnSlaPolicy_NodeContext",
                            "nodeName": "A2",
                            "mininetName": "nn"
                        }

                        {
                            "nameSpace": "org.onap.policy.apex.examples.pcvs.vpnsla",
                            "name": "NodeContextEventIn",
                            "version": "1.0.0",
                            "source": "CtxtManagement",
                            "target" : "VpnSlaPolicy_NodeContext",
                            "nodeName": "B1",
                            "mininetName": "nn"
                        }

                        {
                            "nameSpace": "org.onap.policy.apex.examples.pcvs.vpnsla",
                            "name": "NodeContextEventIn",
                            "version": "1.0.0",
                            "source": "CtxtManagement",
                            "target" : "VpnSlaPolicy_NodeContext",
                            "nodeName": "B2",
                            "mininetName": "nn"
                        }


                        {
                            "nameSpace": "org.onap.policy.apex.examples.pcvs.vpnsla",
                            "name": "NodeContextEventIn",
                            "version": "1.0.0",
                            "source": "CtxtManagement",
                            "target" : "VpnSlaPolicy_NodeContext",
                            "nodeName": "A1CO",
                            "mininetName": "s1"
                        }

                        {
                            "nameSpace": "org.onap.policy.apex.examples.pcvs.vpnsla",
                            "name": "NodeContextEventIn",
                            "version": "1.0.0",
                            "source": "CtxtManagement",
                            "target" : "VpnSlaPolicy_NodeContext",
                            "nodeName": "A2CO",
                            "mininetName": "s2"
                        }

                        {
                            "nameSpace": "org.onap.policy.apex.examples.pcvs.vpnsla",
                            "name": "NodeContextEventIn",
                            "version": "1.0.0",
                            "source": "CtxtManagement",
                            "target" : "VpnSlaPolicy_NodeContext",
                            "nodeName": "B1CO",
                            "mininetName": "s3"
                        }

                        {
                            "nameSpace": "org.onap.policy.apex.examples.pcvs.vpnsla",
                            "name": "NodeContextEventIn",
                            "version": "1.0.0",
                            "source": "CtxtManagement",
                            "target" : "VpnSlaPolicy_NodeContext",
                            "nodeName": "B2CO",
                            "mininetName": "s4"
                        }

                        {
                            "nameSpace": "org.onap.policy.apex.examples.pcvs.vpnsla",
                            "name": "NodeContextEventIn",
                            "version": "1.0.0",
                            "source": "CtxtManagement",
                            "target" : "VpnSlaPolicy_NodeContext",
                            "nodeName": "BBL",
                            "mininetName": "s5"
                        }

                        {
                            "nameSpace": "org.onap.policy.apex.examples.pcvs.vpnsla",
                            "name": "NodeContextEventIn",
                            "version": "1.0.0",
                            "source": "CtxtManagement",
                            "target" : "VpnSlaPolicy_NodeContext",
                            "nodeName": "BBR",
                            "mininetName": "s6"
                        }

Context Events Edges
--------------------

         .. container:: sect1

            .. container:: sectionbody

               .. container:: paragraph

                  The following events create all edges of the topology.

               .. container:: listingblock

                  .. container:: content

                     .. code:: CodeRay

                        {
                            "nameSpace": "org.onap.policy.apex.examples.pcvs.vpnsla",
                            "name": "EdgeContextEventIn",
                            "version": "1.0.0",
                            "source": "CtxtManagement",
                            "target" : "VpnSlaPolicy_EdgeContext",
                            "edgeName": "L01",
                            "start": "A1",
                            "end": "A1CO",
                            "status": true
                        }

                        {
                            "nameSpace": "org.onap.policy.apex.examples.pcvs.vpnsla",
                            "name": "EdgeContextEventIn",
                            "version": "1.0.0",
                            "source": "CtxtManagement",
                            "target" : "VpnSlaPolicy_EdgeContext",
                            "edgeName": "L02",
                            "start": "B1",
                            "end": "B1CO",
                            "status": true
                        }

                        {
                            "nameSpace": "org.onap.policy.apex.examples.pcvs.vpnsla",
                            "name": "EdgeContextEventIn",
                            "version": "1.0.0",
                            "source": "CtxtManagement",
                            "target" : "VpnSlaPolicy_EdgeContext",
                            "edgeName": "L03",
                            "start": "A2",
                            "end": "A2CO",
                            "status": true
                        }

                        {
                            "nameSpace": "org.onap.policy.apex.examples.pcvs.vpnsla",
                            "name": "EdgeContextEventIn",
                            "version": "1.0.0",
                            "source": "CtxtManagement",
                            "target" : "VpnSlaPolicy_EdgeContext",
                            "edgeName": "L04",
                            "start": "B2",
                            "end": "B2CO",
                            "status": true
                        }

                        {
                            "nameSpace": "org.onap.policy.apex.examples.pcvs.vpnsla",
                            "name": "EdgeContextEventIn",
                            "version": "1.0.0",
                            "source": "CtxtManagement",
                            "target" : "VpnSlaPolicy_EdgeContext",
                            "edgeName": "L05",
                            "start": "A1CO",
                            "end": "BBL",
                            "status": true
                        }

                        {
                            "nameSpace": "org.onap.policy.apex.examples.pcvs.vpnsla",
                            "name": "EdgeContextEventIn",
                            "version": "1.0.0",
                            "source": "CtxtManagement",
                            "target" : "VpnSlaPolicy_EdgeContext",
                            "edgeName": "L06",
                            "start": "B1CO",
                            "end": "BBL",
                            "status": true
                        }

                        {
                            "nameSpace": "org.onap.policy.apex.examples.pcvs.vpnsla",
                            "name": "EdgeContextEventIn",
                            "version": "1.0.0",
                            "source": "CtxtManagement",
                            "target" : "VpnSlaPolicy_EdgeContext",
                            "edgeName": "L07",
                            "start": "A2CO",
                            "end": "BBR",
                            "status": true
                        }

                        {
                            "nameSpace": "org.onap.policy.apex.examples.pcvs.vpnsla",
                            "name": "EdgeContextEventIn",
                            "version": "1.0.0",
                            "source": "CtxtManagement",
                            "target" : "VpnSlaPolicy_EdgeContext",
                            "edgeName": "L08",
                            "start": "B2CO",
                            "end": "BBR",
                            "status": true
                        }

                        {
                            "nameSpace": "org.onap.policy.apex.examples.pcvs.vpnsla",
                            "name": "EdgeContextEventIn",
                            "version": "1.0.0",
                            "source": "CtxtManagement",
                            "target" : "VpnSlaPolicy_EdgeContext",
                            "edgeName": "L09",
                            "start": "BBL",
                            "end": "BBR",
                            "status": true
                        }

                        {
                            "nameSpace": "org.onap.policy.apex.examples.pcvs.vpnsla",
                            "name": "EdgeContextEventIn",
                            "version": "1.0.0",
                            "source": "CtxtManagement",
                            "target" : "VpnSlaPolicy_EdgeContext",
                            "edgeName": "L10",
                            "start": "BBR",
                            "end": "BBL",
                            "status": true
                        }

Context Events Customers
------------------------

         .. container:: sect1

            .. container:: sectionbody

               .. container:: paragraph

                  The following events create all customers of the
                  topology.

               .. container:: listingblock

                  .. container:: content

                     .. code:: CodeRay

                        {
                            "nameSpace": "org.onap.policy.apex.examples.pcvs.vpnsla",
                            "name": "CustomerContextEventIn",
                            "version": "1.0.0",
                            "source": "CtxtManagement",
                            "target" : "VpnSlaPolicy_CustomerContext",
                            "customerName": "A",
                            "links": "L01 L05 L09 L10",
                            "dtSLA": 180,
                            "dtYTD": 10,
                            "priority": false,
                            "satisfaction": 80
                        }

                        {
                            "nameSpace": "org.onap.policy.apex.examples.pcvs.vpnsla",
                            "name": "CustomerContextEventIn",
                            "version": "1.0.0",
                            "source": "CtxtManagement",
                            "target" : "VpnSlaPolicy_CustomerContext",
                            "customerName": "B",
                            "links": "L02 L07 L09 L10",
                            "dtSLA": 180,
                            "dtYTD": 120,
                            "priority": true,
                            "satisfaction": 99
                        }

Trigger Examples
----------------

         .. container:: sect1

            .. container:: sectionbody

               .. container:: paragraph

                  The following events are examples for trigger events

               .. container:: listingblock

                  .. container:: content

                     .. code:: CodeRay

                        {
                            "nameSpace": "org.onap.policy.apex.examples.pcvs.vpnsla",
                            "name": "VpnSlaTrigger",
                            "version": "1.0.0",
                            "source": "ExampleEvents",
                            "target" : "VpnSlaPolicy",
                            "edgeName": "L09",
                            "status": "UP"
                        }

                        {
                            "nameSpace": "org.onap.policy.apex.examples.pcvs.vpnsla",
                            "name": "VpnSlaTrigger",
                            "version": "1.0.0",
                            "source": "ExampleEvents",
                            "target" : "VpnSlaPolicy",
                            "edgeName": "L09",
                            "status": "UP"
                        }

                        {
                            "nameSpace": "org.onap.policy.apex.examples.pcvs.vpnsla",
                            "name": "VpnSlaTrigger",
                            "version": "1.0.0",
                            "source": "ExampleEvents",
                            "target" : "VpnSlaPolicy",
                            "edgeName": "L09",
                            "status": "DOWN"
                        }

                        {
                            "nameSpace": "org.onap.policy.apex.examples.pcvs.vpnsla",
                            "name": "VpnSlaTrigger",
                            "version": "1.0.0",
                            "source": "ExampleEvents",
                            "target" : "VpnSlaPolicy",
                            "edgeName": "L09",
                            "status": "DOWN"
                        }

                        {
                            "nameSpace": "org.onap.policy.apex.examples.pcvs.vpnsla",
                            "name": "VpnSlaTrigger",
                            "version": "1.0.0",
                            "source": "ExampleEvents",
                            "target" : "VpnSlaPolicy",
                            "edgeName": "L09",
                            "status": "UP"
                        }

Link Monitor
------------

         .. container:: sect1

            .. container:: sectionbody

               .. container:: paragraph

                  The Link Monitor is a Python script. At startup, it
                  sends the context events to APEX to initialize the
                  topology and the customers. Then it takes events from
                  Kafka and sends them to APEX.

               .. container:: listingblock

                  .. container:: content

                     .. code:: CodeRay

                        # ============LICENSE_START=======================================================
                        #  Copyright (C) 2016-2018 Ericsson. All rights reserved.
                        # ================================================================================
                        # Licensed under the Apache License, Version 2.0 (the "License");
                        # you may not use this file except in compliance with the License.
                        # You may obtain a copy of the License at
                        #
                        #      http://www.apache.org/licenses/LICENSE-2.0
                        #
                        # Unless required by applicable law or agreed to in writing, software
                        # distributed under the License is distributed on an "AS IS" BASIS,
                        # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
                        # See the License for the specific language governing permissions and
                        # limitations under the License.
                        #
                        # SPDX-License-Identifier: Apache-2.0
                        # ============LICENSE_END=========================================================

                        import http.client
                        import json
                        import time
                        from kafka import KafkaConsumer, KafkaProducer

                        class StaticFlowPusher(object):

                            def __init__(self, server):
                                self.server = server

                            def get(self, data):
                                ret = self.rest_call({}, 'GET')
                                return json.loads(ret[2])

                            def set(self, data):
                                ret = self.rest_call(data, 'POST')
                                return ret[0] == 200

                            def remove(self, objtype, data):
                                ret = self.rest_call(data, 'DELETE')
                                return ret[0] == 200

                            def getControllerSummary(self, data):
                                ret = self.rest_call_controller_summary({}, 'GET')
                                return json.loads(ret[2])

                            def getLinks(self, data):
                                ret = self.rest_call_links({}, 'GET')
                                return json.loads(ret[2].decode())

                            def rest_call(self, data, action):
                                path = '/wm/staticflowpusher/json'
                                headers = {
                                    'Content-type': 'application/json',
                                    'Accept': 'application/json',
                                    }
                                body = json.dumps(data)
                                conn = http.client.HTTPConnection(self.server, 8080)
                                conn.request(action, path, body, headers)
                                response = conn.getresponse()
                                ret = (response.status, response.reason, response.read())
                                print(ret)
                                conn.close()
                                return ret

                            def rest_call_controller_summary(self, data, action):
                                path = '/wm/core/controller/summary/json'
                                headers = {
                                    'Content-type': 'application/json',
                                    'Accept': 'application/json',
                                    }
                                body = json.dumps(data)
                                conn = http.client.HTTPConnection(self.server, 8080)
                                conn.request(action, path, body, headers)
                                response = conn.getresponse()
                                ret = (response.status, response.reason, response.read())
                                print(ret)
                                conn.close()
                                return ret

                            def rest_call_links(self, data, action):
                                path = '/wm/topology/links/json'
                                headers = {
                                    'Content-type': 'application/json',
                                    'Accept': 'application/json',
                                    }
                                body = json.dumps(data)
                                conn = http.client.HTTPConnection(self.server, 8080)
                                conn.request(action, path, body, headers)
                                response = conn.getresponse()
                                ret = (response.status, response.reason, response.read())
                                conn.close()
                                return ret

                        pusher = StaticFlowPusher('127.0.1.1')


                        def parseLinks(links):
                                #print("\n\n\n",links)
                                result = []
                                for link in links:
                                        list = []
                                        #print("\n\n\n",link)
                                        #print("\nsrc-switch : s", link['src-switch'][len(link['src-switch'])-1])
                                        #print("\ndst-switch : s", link['dst-switch'][len(link['dst-switch'])-1])
                                        list.append("s")
                                        list.append(link['src-switch'][len(link['src-switch'])-1])
                                        list.append("-s")
                                        list.append(link['dst-switch'][len(link['dst-switch'])-1])
                                        result.append(''.join(list))
                                #print(result, "\n")
                                return result



                        counter =0
                        healthyList = []
                        testableList = []
                        healthyLinks = ""
                        testableLinks = ""
                        producer = KafkaProducer(bootstrap_servers='localhost:9092')
                        while(True):
                                time.sleep(30)
                                switchLinks = pusher.getLinks({})
                                if counter == 0:
                                        healthyList = parseLinks(switchLinks)
                                        #Build All Links
                                        print("READING LINKS FROM MININET\n")
                                        for l in healthyList:
                                                link = ""
                                                #print(l, "\n")
                                                #Links between switches [s6-s7 is ignored so it matches VPN SCENARIO]
                                                if(l == "s1-s5"):
                                                        link = "{'nameSpace': 'org.onap.policy.apex.examples.pcvs.vpnsla','name': 'EdgeContextEventIn','version': '1.0.0','source': 'LinkMonitor.py','target': 'VpnSlaPolicy_EdgeContext','status': true,'edgeName': 'L05', 'start': 'A1CO','end': 'BBL'}"
                                                        producer.send("apex-in-0", bytes(link, encoding="ascii"))
                                                if(l == "s5-s6"):
                                                        link = "{'nameSpace': 'org.onap.policy.apex.examples.pcvs.vpnsla','name': 'EdgeContextEventIn','version': '1.0.0','source': 'LinkMonitor.py','target': 'VpnSlaPolicy_EdgeContext','status': true,'edgeName': 'L09', 'start': 'BBL','end': 'BBR'}"
                                                        producer.send("apex-in-0", bytes(link, encoding="ascii"))
                                                if(l == "s2-s6"):
                                                        link = "{'nameSpace': 'org.onap.policy.apex.examples.pcvs.vpnsla','name': 'EdgeContextEventIn','version': '1.0.0','source': 'LinkMonitor.py','target': 'VpnSlaPolicy_EdgeContext','status': true,'edgeName': 'L07', 'start': 'A2CO','end': 'BBR'}"
                                                        producer.send("apex-in-0", bytes(link, encoding="ascii"))
                                                if(l == "s5-s7"):
                                                        link = "{'nameSpace': 'org.onap.policy.apex.examples.pcvs.vpnsla','name': 'EdgeContextEventIn','version': '1.0.0','source': 'LinkMonitor.py','target': 'VpnSlaPolicy_EdgeContext','status': true,'edgeName': 'L10', 'start': 'BBR','end': 'BBL'}"
                                                        producer.send("apex-in-0", bytes(link, encoding="ascii"))
                                                if(l == "s3-s5"):
                                                        link = "{'nameSpace': 'org.onap.policy.apex.examples.pcvs.vpnsla','name': 'EdgeContextEventIn','version': '1.0.0','source': 'LinkMonitor.py','target': 'VpnSlaPolicy_EdgeContext','status': true,'edgeName': 'L06', 'start': 'B1CO','end': 'BBL'}"
                                                        producer.send("apex-in-0", bytes(link, encoding="ascii"))
                                                if(l == "s4-s6"):
                                                        link = "{'nameSpace': 'org.onap.policy.apex.examples.pcvs.vpnsla','name': 'EdgeContextEventIn','version': '1.0.0','source': 'LinkMonitor.py','target': 'VpnSlaPolicy_EdgeContext','status': true,'edgeName': 'L08', 'start': 'B2CO','end': 'BBR'}"
                                                        producer.send("apex-in-0", bytes(link, encoding="ascii"))
                                        #Links between switches and hosts [NoT SENT IN FROM FLOODLIGHT]
                                        producer.send("apex-in-0", b"{'nameSpace': 'org.onap.policy.apex.examples.pcvs.vpnsla','name': 'EdgeContextEventIn','version': '1.0.0','source': 'LinkMonitor.py','target': 'VpnSlaPolicy_EdgeContext','status': true,'edgeName': 'L01', 'start': 'A1','end': 'A1CO'}")
                                        producer.send("apex-in-0", b"{'nameSpace': 'org.onap.policy.apex.examples.pcvs.vpnsla','name': 'EdgeContextEventIn','version': '1.0.0','source': 'LinkMonitor.py','target': 'VpnSlaPolicy_EdgeContext','status': true,'edgeName': 'L02', 'start': 'B1','end': 'B1CO'}")
                                        producer.send("apex-in-0", b"{'nameSpace': 'org.onap.policy.apex.examples.pcvs.vpnsla','name': 'EdgeContextEventIn','version': '1.0.0','source': 'LinkMonitor.py','target': 'VpnSlaPolicy_EdgeContext','status': true,'edgeName': 'L03', 'start': 'A2','end': 'A2CO'}")
                                        producer.send("apex-in-0", b"{'nameSpace': 'org.onap.policy.apex.examples.pcvs.vpnsla','name': 'EdgeContextEventIn','version': '1.0.0','source': 'LinkMonitor.py','target': 'VpnSlaPolicy_EdgeContext','status': true,'edgeName': 'L04', 'start': 'B2','end': 'B2CO'}")
                                        print("LINKS HAVE BEEN SENT TO APEX\n")

                                        #Build Customers
                                        print("BUILDING CUSTOMERS\n")
                                        producer.send("apex-in-0", b"{'nameSpace': 'org.onap.policy.apex.examples.pcvs.vpnsla','name': 'CustomerContextEventIn','version': '1.0.0','source': 'LinkMonitor.py','target': 'VpnSlaPolicy_CustomerContext','dtYTD': 10,'dtSLA': 180,'links': 'L01 L05 L09 L10','customerName': 'A', 'priority': true,'satisfaction': 80}")
                                        producer.send("apex-in-0", b"{'nameSpace': 'org.onap.policy.apex.examples.pcvs.vpnsla','name': 'CustomerContextEventIn','version': '1.0.0','source': 'LinkMonitor.py','target': 'VpnSlaPolicy_CustomerContext','dtYTD': 120,'dtSLA': 180,'links': 'L02 L07 L09 L10','customerName': 'B', 'priority': false,'satisfaction': 99}")
                                        print("CUSTOMERS HAVE BEEN SENT TO APEX\n")
                                        healthyLinks = switchLinks
                                        myfile = open('LinkInfo.json', 'a')
                                        myfile.write(str(healthyLinks))
                                        myfile.write('\n')
                                        myfile.close()
                                        print("We start off with", len(healthyLinks), "healthy Links!\n")
                                else:
                                        testableList = parseLinks(switchLinks)
                                        issueLink = "";
                                        for h in healthyList:
                                                issueLink = h
                                                for t in testableList:
                                                        if t == h:
                                                                issueLink = ""
                                                if issueLink != "":
                                                        print("There is an issue with the links! ", issueLink, " \n")
                                                        if(issueLink == "s1-s5"):
                                                                link = "{'nameSpace': 'org.onap.policy.apex.examples.pcvs.vpnsla','name': 'VpnSlaTrigger','version': '1.0.0','source': 'LinkMonitor.py','target': 'VpnSlaPolicy','status': 'DOWN','edgeName': 'L05'}"
                                                                producer.send("apex-in-0", bytes(link, encoding="ascii"))
                                                        if(issueLink == "s5-s6"):
                                                                link = "{'nameSpace': 'org.onap.policy.apex.examples.pcvs.vpnsla','name': 'VpnSlaTrigger','version': '1.0.0','source': 'LinkMonitor.py','target': 'VpnSlaPolicy','status': 'DOWN','edgeName': 'L09'}"
                                                                producer.send("apex-in-0", bytes(link, encoding="ascii"))
                                                        if(issueLink == "s2-s6"):
                                                                link = "{'nameSpace': 'org.onap.policy.apex.examples.pcvs.vpnsla','name': 'VpnSlaTrigger','version': '1.0.0','source': 'LinkMonitor.py','target': 'VpnSlaPolicy','status': 'DOWN','edgeName': 'L07'}"
                                                                producer.send("apex-in-0", bytes(link, encoding="ascii"))
                                                        if(issueLink == "s5-s7"):
                                                                link = "{'nameSpace': 'org.onap.policy.apex.examples.pcvs.vpnsla','name': 'VpnSlaTrigger','version': '1.0.0','source': 'LinkMonitor.py','target': 'VpnSlaPolicy','status': 'DOWN','edgeName': 'L10'}"
                                                                producer.send("apex-in-0", bytes(link, encoding="ascii"))
                                                        if(issueLink == "s3-s5"):
                                                                link = "{'nameSpace': 'org.onap.policy.apex.examples.pcvs.vpnsla','name': 'VpnSlaTrigger','version': '1.0.0','source': 'LinkMonitor.py','target': 'VpnSlaPolicy','status': 'DOWN','edgeName': 'L06'}"
                                                                producer.send("apex-in-0", bytes(link, encoding="ascii"))
                                                        if(issueLink == "s4-s6"):
                                                                link = "{'nameSpace': 'org.onap.policy.apex.examples.pcvs.vpnsla','name': 'VpnSlaTrigger','version': '1.0.0','source': 'LinkMonitor.py','target': 'VpnSlaPolicy','status': 'DOWN','edgeName': 'L08'}"
                                                                producer.send("apex-in-0", bytes(link, encoding="ascii"))
                                                        break
                                        if issueLink == "":
                                                print("All Links are working\n")
                                                producer.send("apex-in-0", b"{'nameSpace': 'org.onap.policy.apex.examples.pcvs.vpnsla','name': 'VpnSlaTrigger','version': '1.0.0','source': 'LinkMonitor.py','target': 'VpnSlaPolicy','status': 'UP','edgeName': 'L01'}")
                                                producer.send("apex-in-0", b"{'nameSpace': 'org.onap.policy.apex.examples.pcvs.vpnsla','name': 'VpnSlaTrigger','version': '1.0.0','source': 'LinkMonitor.py','target': 'VpnSlaPolicy','status': 'UP','edgeName': 'L02'}")
                                                producer.send("apex-in-0", b"{'nameSpace': 'org.onap.policy.apex.examples.pcvs.vpnsla','name': 'VpnSlaTrigger','version': '1.0.0','source': 'LinkMonitor.py','target': 'VpnSlaPolicy','status': 'UP','edgeName': 'L03'}")
                                                producer.send("apex-in-0", b"{'nameSpace': 'org.onap.policy.apex.examples.pcvs.vpnsla','name': 'VpnSlaTrigger','version': '1.0.0','source': 'LinkMonitor.py','target': 'VpnSlaPolicy','status': 'UP','edgeName': 'L04'}")
                                                producer.send("apex-in-0", b"{'nameSpace': 'org.onap.policy.apex.examples.pcvs.vpnsla','name': 'VpnSlaTrigger','version': '1.0.0','source': 'LinkMonitor.py','target': 'VpnSlaPolicy','status': 'UP','edgeName': 'L05'}")
                                                producer.send("apex-in-0", b"{'nameSpace': 'org.onap.policy.apex.examples.pcvs.vpnsla','name': 'VpnSlaTrigger','version': '1.0.0','source': 'LinkMonitor.py','target': 'VpnSlaPolicy','status': 'UP','edgeName': 'L06'}")
                                                producer.send("apex-in-0", b"{'nameSpace': 'org.onap.policy.apex.examples.pcvs.vpnsla','name': 'VpnSlaTrigger','version': '1.0.0','source': 'LinkMonitor.py','target': 'VpnSlaPolicy','status': 'UP','edgeName': 'L07'}")
                                                producer.send("apex-in-0", b"{'nameSpace': 'org.onap.policy.apex.examples.pcvs.vpnsla','name': 'VpnSlaTrigger','version': '1.0.0','source': 'LinkMonitor.py','target': 'VpnSlaPolicy','status': 'UP','edgeName': 'L08'}")
                                                producer.send("apex-in-0", b"{'nameSpace': 'org.onap.policy.apex.examples.pcvs.vpnsla','name': 'VpnSlaTrigger','version': '1.0.0','source': 'LinkMonitor.py','target': 'VpnSlaPolicy','status': 'UP','edgeName': 'L09'}")
                                                producer.send("apex-in-0", b"{'nameSpace': 'org.onap.policy.apex.examples.pcvs.vpnsla','name': 'VpnSlaTrigger','version': '1.0.0','source': 'LinkMonitor.py','target': 'VpnSlaPolicy','status': 'UP','edgeName': 'L10'}")

                                        testableLinks = switchLinks
                                        myfile = open('LinkInfo.json', 'a')
                                        myfile.write(str(testableLinks))
                                        myfile.write('\n')
                                        myfile.close()
                                counter += 1

Mininet Topology
----------------

         .. container:: sect1

            .. container:: sectionbody

               .. container:: paragraph

                  The topology is realized using Mininet. The following
                  script is use to estalish the topology and to realize
                  network configurations.

               .. container:: listingblock

                  .. container:: content

                     .. code:: CodeRay

                        # ============LICENSE_START=======================================================
                        #  Copyright (C) 2016-2018 Ericsson. All rights reserved.
                        # ================================================================================
                        # Licensed under the Apache License, Version 2.0 (the "License");
                        # you may not use this file except in compliance with the License.
                        # You may obtain a copy of the License at
                        #
                        #      http://www.apache.org/licenses/LICENSE-2.0
                        #
                        # Unless required by applicable law or agreed to in writing, software
                        # distributed under the License is distributed on an "AS IS" BASIS,
                        # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
                        # See the License for the specific language governing permissions and
                        # limitations under the License.
                        #
                        # SPDX-License-Identifier: Apache-2.0
                        # ============LICENSE_END=========================================================

                        #Add Mininet to PATH
                        import sys
                        sys.path.insert(0, "/~/mininet")

                        #Kafka
                        import httplib
                        import json
                        import time
                        from kafka import KafkaConsumer, KafkaProducer

                        #Mininet
                        from mininet.clean import *
                        from mininet.cli import *
                        from mininet.link import *
                        from mininet.log import *
                        from mininet.net import *
                        from mininet.node import *
                        from mininet.nodelib import *
                        from mininet.topo import *
                        from mininet.topolib import *

                        class StaticFlowPusher(object):
                            def __init__(self, server):
                                self.server = server

                            def enableFirewall(self, data):
                                path = "/wm/firewall/module/enable/json"
                                headers = {'Content-Type': 'application/json','Accept': 'application/json',}
                                body = json.dumps(data)
                                conn = httplib.HTTPConnection(self.server, 8080)
                                conn.request("PUT", path, "")
                                response = conn.getresponse()
                                ret = (response.status, response.reason, response.read())
                                conn.close()
                                return ret

                            def addRule(self, data):
                                path = '/wm/firewall/rules/json'
                                headers = {'Content-Type': 'application/json','Accept': 'application/json',}
                                body = json.dumps(data)
                                conn = httplib.HTTPConnection(self.server, 8080)
                                conn.request('POST', path, body, headers)
                                response = conn.getresponse()
                                ret = (response.status, response.reason, response.read())
                                conn.close()
                                return ret

                            def deleteRule(self, data):
                                path = '/wm/firewall/rules/json'
                                headers = {'Content-Type': 'application/json','Accept': 'application/json',}
                                body = json.dumps(data)
                                conn = httplib.HTTPConnection(self.server, 8080)
                                conn.request('DELETE', path, body, headers)
                                response = conn.getresponse()
                                ret = (response.status, response.reason, response.read())
                                conn.close()
                                return ret

                        #Build Pusher(REST/IN)
                        pusher = StaticFlowPusher('127.0.0.1')

                        net = Mininet(link=TCLink)

                        #Create Customers
                        customerA1 = net.addHost( 'A1' )
                        customerA2 = net.addHost( 'A2' )
                        customerB1 = net.addHost( 'B1' )
                        customerB2 = net.addHost( 'B2' )

                        #Create Switches
                        switchA1CO = net.addSwitch( 's1' )
                        switchA2CO = net.addSwitch( 's2' )
                        switchB1CO = net.addSwitch( 's3' )
                        switchB2CO = net.addSwitch( 's4' )
                        switchBBL = net.addSwitch( 's5' )
                        switchBBR = net.addSwitch( 's6' )
                        # we need an extra switch here because Mininet does not allow two links between two switches
                        switchEx = net.addSwitch( 's7' )

                        #Create Links
                        net.addLink( customerA1, switchA1CO )
                        net.addLink( customerA2, switchA2CO )
                        net.addLink( customerB1, switchB1CO )
                        net.addLink( customerB2, switchB2CO )
                        net.addLink( switchA1CO, switchBBL )
                        net.addLink( switchB1CO, switchBBL )
                        net.addLink( switchA2CO, switchBBR )
                        net.addLink( switchB2CO, switchBBR )
                        net.addLink( switchBBL, switchBBR)
                        net.addLink( switchBBR, switchEx, bw=1.2 )
                        net.addLink( switchEx, switchBBL )

                        #Create Controller
                        floodlightController = net.addController(name='c0' , controller=RemoteController , ip='127.0.0.1', port=6653)

                        net.start()

                        if pusher.enableFirewall({})[0] == 200:
                            print("Firewall enabled!")

                        #print(pusher.addRule({"switchid": "00:00:00:00:00:00:00:01"})[2])
                        s1id = json.loads(pusher.addRule({"switchid": "00:00:00:00:00:00:00:01"})[2])['rule-id']
                        s2id = json.loads(pusher.addRule({"switchid": "00:00:00:00:00:00:00:02"})[2])['rule-id']
                        s3id = json.loads(pusher.addRule({"switchid": "00:00:00:00:00:00:00:03"})[2])['rule-id']
                        s4id = json.loads(pusher.addRule({"switchid": "00:00:00:00:00:00:00:04"})[2])['rule-id']
                        s5id = json.loads(pusher.addRule({"switchid": "00:00:00:00:00:00:00:05"})[2])['rule-id']
                        s6id = json.loads(pusher.addRule({"switchid": "00:00:00:00:00:00:00:06"})[2])['rule-id']
                        s7id = json.loads(pusher.addRule({"switchid": "00:00:00:00:00:00:00:07"})[2])['rule-id']


                        result = 100
                        while result!=0:
                            result = net.pingAll(None)
                        print("Network Simulation Complete")

                        #Assume control and when finished "exit"
                        cli = CLI( net )

                        consumer = KafkaConsumer(bootstrap_servers='localhost:9092',auto_offset_reset='latest')
                        consumer.subscribe(['apex-out'])
                        print("Starting Message Loop")
                        for message in consumer:
                            myOutput = json.loads(message.value.decode())
                            action = ""
                            try:
                                print("Checking Message")
                                #print("SWITCHES= ",net.switches)
                                #print("LINKS= ",net.links)
                                #print("VALUES= ",net.values)
                                if myOutput['edgeName'] != '':
                                    print("Message Received: ",myOutput['edgeName'])
                                    pusher.deleteRule({"ruleid": s1id})
                                    pusher.deleteRule({"ruleid": s2id})
                                    pusher.deleteRule({"ruleid": s3id})
                                    pusher.deleteRule({"ruleid": s4id})
                                    pusher.deleteRule({"ruleid": s5id})
                                    pusher.deleteRule({"ruleid": s6id})
                                    pusher.deleteRule({"ruleid": s7id})
                                    s1id = json.loads(pusher.addRule({"switchid": "00:00:00:00:00:00:00:01"})[2])['rule-id']
                                    s2id = json.loads(pusher.addRule({"switchid": "00:00:00:00:00:00:00:02"})[2])['rule-id']
                                    s3id = json.loads(pusher.addRule({"switchid": "00:00:00:00:00:00:00:03"})[2])['rule-id']
                                    s4id = json.loads(pusher.addRule({"switchid": "00:00:00:00:00:00:00:04"})[2])['rule-id']
                                    s5id = json.loads(pusher.addRule({"switchid": "00:00:00:00:00:00:00:05"})[2])['rule-id']
                                    s6id = json.loads(pusher.addRule({"switchid": "00:00:00:00:00:00:00:06"})[2])['rule-id']
                                    s7id = json.loads(pusher.addRule({"switchid": "00:00:00:00:00:00:00:07"})[2])['rule-id']
                                    if myOutput['edgeName'] == "L01":
                                        action = "link s1 s5 down"
                                        #net.configLinkStatus('s1', 's5', "down")
                                        pusher.deleteRule({"ruleid": s1id})
                                        s1id = json.loads(pusher.addRule({"switchid": "00:00:00:00:00:00:00:01", "action": "DENY"})[2])['rule-id']
                                    if myOutput['edgeName'] == "L02":
                                        action = "link s3 s5 down"
                                        #net.configLinkStatus('s3', 's5', "down")
                                        pusher.deleteRule({"ruleid": s3id})
                                        s3id = json.loads(pusher.addRule({"switchid": "00:00:00:00:00:00:00:03", "action": "DENY"})[2])['rule-id']
                                    if myOutput['edgeName'] == "L03":
                                        action = "link s2 s6 down"
                                        #net.configLinkStatus('s2', 's6', "down")
                                        pusher.deleteRule({"ruleid": s1id})
                                        s1id = json.loads(pusher.addRule({"switchid": "00:00:00:00:00:00:00:01", "action": "DENY"})[2])['rule-id']
                                    if myOutput['edgeName'] == "L04":
                                        action = "link s4 s6 down"
                                        #net.configLinkStatus('s4', 's6', "down")
                                        pusher.deleteRule({"ruleid": s3id})
                                        s3id = json.loads(pusher.addRule({"switchid": "00:00:00:00:00:00:00:03", "action": "DENY"})[2])['rule-id']
                                    if myOutput['edgeName'] == "L05":
                                        action = "link s1 s5 down"
                                        #net.configLinkStatus('s1', 's5', "down")
                                        pusher.deleteRule({"ruleid": s1id})
                                        s1id = json.loads(pusher.addRule({"switchid": "00:00:00:00:00:00:00:01", "action": "DENY"})[2])['rule-id']
                                    if myOutput['edgeName'] == "L06":
                                        action = "link s3 s5 down"
                                        #net.configLinkStatus('s3', 's5', "down")
                                        pusher.deleteRule({"ruleid": s3id})
                                        s3id = json.loads(pusher.addRule({"switchid": "00:00:00:00:00:00:00:03", "action": "DENY"})[2])['rule-id']
                                    if myOutput['edgeName'] == "L07":
                                        action = "link s2 s6 down"
                                        #net.configLinkStatus('s2', 's6', "down")
                                        pusher.deleteRule({"ruleid": s2id})
                                        s2id = json.loads(pusher.addRule({"switchid": "00:00:00:00:00:00:00:02", "action": "DENY"})[2])['rule-id']
                                    if myOutput['edgeName'] == "L08":
                                        action = "link s4 s6 down"
                                        #net.configLinkStatus('s4', 's6', "down")
                                        pusher.deleteRule({"ruleid": s4id})
                                        s4id = json.loads(pusher.addRule({"switchid": "00:00:00:00:00:00:00:04", "action": "DENY"})[2])['rule-id']
                                    if myOutput['edgeName'] == "L09":
                                        action = "link s5 s6 down"
                                        #net.configLinkStatus('s5', 's6', "down")
                                        pusher.deleteRule({"ruleid": s7id})
                                        s7id = json.loads(pusher.addRule({"switchid": "00:00:00:00:00:00:00:07", "action": "DENY"})[2])['rule-id']
                                    if myOutput['edgeName'] == "L10":
                                        print("L10")
                                    #print(action)
                                #print("3")
                            except KeyError:
                                print(myOutput)
                        print("HA")
                        net.stop()

   .. container::
      :name: footer-text

      2.3.0-SNAPSHOT
      Last updated 2020-04-03 16:04:24 IST


.. |ONAP| image:: ../../../images/logos.png
   :class: builtBy
   :target: http://www.onap.org/

.. |VPN SLA Architecture| image:: images/pcvs/vpnsla-arch.png