1 files changed, 206 insertions, 0 deletions
diff --git a/components/slice-analysis-ms/src/main/java/org/onap/slice/analysis/ms/service/ccvpn/FixedUpperBoundStrategy.java b/components/slice-analysis-ms/src/main/java/org/onap/slice/analysis/ms/service/ccvpn/FixedUpperBoundStrategy.java
new file mode 100644
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--- /dev/null
+++ b/components/slice-analysis-ms/src/main/java/org/onap/slice/analysis/ms/service/ccvpn/FixedUpperBoundStrategy.java
@@ -0,0 +1,206 @@
+/*******************************************************************************
+ *  ============LICENSE_START=======================================================
+ *  slice-analysis-ms
+ *  ================================================================================
+ *   Copyright (C) 2022 Huawei Canada Limited.
+ *  ==============================================================================
+ *     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.
+ *     ============LICENSE_END=========================================================
+ *
+ *******************************************************************************/
+package org.onap.slice.analysis.ms.service.ccvpn;
+
+import com.google.gson.JsonObject;
+import org.onap.slice.analysis.ms.models.Configuration;
+import org.onap.slice.analysis.ms.service.PolicyService;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Component;
+
+import javax.annotation.PostConstruct;
+import java.util.Arrays;
+import java.util.Map;
+import java.util.TreeMap;
+import java.util.stream.Collectors;
+
+@Component
+public class FixedUpperBoundStrategy implements EvaluationStrategy{
+    private static Logger log = LoggerFactory.getLogger(FixedUpperBoundStrategy.class);
+    private Configuration configuration;
+
+    private static final String TYPE_NAME = "FixedUpperBoundStrategy";
+    private static final String SERVICE_INSTANCE_LOCATION_ID = "service-instance-location-id";
+    private static final String BANDWIDTH_TOTAL = "bandwidth-total";
+
+    /**
+     * Percentage threshold of bandwidth adjustment.
+     */
+    private static double threshold;
+
+    /**
+     * Precision of bandwidth evaluation and adjustment.
+     */
+    private static double precision; // in Mbps;
+
+    @Autowired
+    BandwidthEvaluator bandwidthEvaluator;
+
+    @Autowired
+    CCVPNPmDatastore ccvpnPmDatastore;
+
+    @Autowired
+    PolicyService policyService;
+
+    @PostConstruct
+    public void init() {
+        loadConfig();
+    }
+
+    @Override
+    public void execute(Event event){
+        if (event.type() == SimpleEvent.Type.PERIODIC_CHECK && isPeriodicCheckOn()){
+            log.debug("=== Processing new periodic check request: {} ===", event.time());
+            Map<Endpointkey, CCVPNPmDatastore.EvictingQueue<Integer>> usedBwMap = ccvpnPmDatastore.getUsedBwMap();
+            Map<String, Integer> candidate = new TreeMap<>();
+            for(Map.Entry<Endpointkey, CCVPNPmDatastore.EvictingQueue<Integer>> entry: usedBwMap.entrySet()) {
+                String serviceId = entry.getKey().getCllId();
+                Object[] usedBws = entry.getValue().tryReadToArray();
+
+                if (usedBws == null) {
+                    // No enough data for evaluating
+                    log.debug("CCVPN Evaluator Output: service {}, not enough data to evaluate", serviceId);
+                    continue;
+                }
+                if (ccvpnPmDatastore.getProvBwOfSvc(serviceId) == 0) {
+                    // Max bandwidth not cached yet
+                    log.debug("CCVPN Evaluator Output: service {}, max bandwidth not cached, wait for next round", serviceId);
+                    post(new SimpleEvent(SimpleEvent.Type.AAI_BW_REQ, serviceId));
+                    continue;
+                }
+                double avg = Arrays.stream(usedBws)
+                        .mapToInt(o -> (int) o)
+                        .summaryStatistics()
+                        .getAverage();
+                int provBw = ccvpnPmDatastore.getProvBwOfSvc(serviceId);
+                int upperBw = ccvpnPmDatastore.getUpperBoundBwOfSvc(serviceId);
+                if (needAdjust(serviceId, avg, provBw, upperBw)) {
+                    int newBw = needAdjustTo(serviceId, avg, provBw, upperBw);
+                    if(Math.abs(newBw - provBw) >= precision){
+                        log.info("CCVPN Evaluator Output: service {}, need adjustment, putting into candidate list", serviceId);
+                        candidate.put(serviceId, newBw);
+                    }
+                }
+            }
+            // check svc under maintenance
+            Map<String , ServiceState> svcUnderMaintenance = getServicesUnderMaintenance();
+            for (Map.Entry<String, ServiceState> entry: svcUnderMaintenance.entrySet()){
+                candidate.putIfAbsent(entry.getKey(), 0);
+            }
+            // fetch the provisioned bandwidth info if underMaintenance; otherwise send modification request
+            for(Map.Entry<String, Integer> entry: candidate.entrySet()) {
+                //still doing adjustment
+                if (isServiceUnderMaintenance(entry.getKey())) {
+                    if (entry.getValue() == 0){
+                        log.debug("CCVPN Evaluator Output: service {}," +
+                                " is in maintenance state, fetching bandwidth info from AAI", entry.getKey());
+                    } else {
+                        log.debug("CCVPN Evaluator Output: candidate {}," +
+                                " need an adjustment, but skipped due to in maintenance state", entry.getKey());
+                    }
+                    post(new SimpleEvent(SimpleEvent.Type.AAI_BW_REQ, entry.getKey()));
+                    continue;
+                }
+                //not in the mid of adjustment; we are free to adjust.
+                log.info("CCVPN Evaluator Output: candidate {}," +
+                        " need an adjustment, sending request to policy", entry.getKey());
+                ccvpnPmDatastore.updateSvcState(entry.getKey(), ServiceState.UNDER_MAINTENANCE);
+                sendModifyRequest(entry.getKey(), entry.getValue(), RequestOwner.DCAE);
+            }
+            log.debug("=== Processing periodic check complete ===");
+        }
+        if (event.type() == SimpleEvent.Type.ONDEMAND_CHECK && isOnDemandCheckOn()) {
+            log.debug("=== Processing upperbound adjustment request: {} ===", event.time());
+            JsonObject payload = (JsonObject) event.subject();
+            String serviceId = payload.get(SERVICE_INSTANCE_LOCATION_ID).getAsString();
+            int newBandwidth = payload.get(BANDWIDTH_TOTAL).getAsInt();
+            log.info("Update service {} bandwidth upperbound to {} ", serviceId, newBandwidth);
+            ccvpnPmDatastore.updateUpperBoundBw(serviceId, newBandwidth);
+            log.debug("=== Processing upperbound adjustment complete ===");
+        }
+    }
+
+    @Override
+    public String getName() {
+        return TYPE_NAME;
+    }
+
+    /**
+     * Post/broadcast event to the BandwidthEvaluator
+     * @param event event object
+     */
+    private void post(Event event){
+        bandwidthEvaluator.post(event);
+    }
+
+    private void loadConfig() {
+        configuration = Configuration.getInstance();
+        threshold = configuration.getCcvpnEvalThreshold();
+        precision = configuration.getCcvpnEvalPrecision(); // in Mbps;
+    }
+
+    private boolean isPeriodicCheckOn() {
+        configuration = Configuration.getInstance();
+        return configuration.isCcvpnEvalPeriodicCheckOn();
+    }
+
+    private boolean isOnDemandCheckOn() {
+        configuration = Configuration.getInstance();
+        return configuration.isCcvpnEvalOnDemandCheckOn();
+    }
+
+    // send modification requestion
+    private void sendModifyRequest(String cllId, Integer newBandwidth, RequestOwner owner) {
+        log.info("Sending modification request to policy. RequestOwner: {} - Service: {} change to bw: {}",
+                owner, cllId, newBandwidth);
+        policyService.sendOnsetMessageToPolicy(
+                policyService.formPolicyOnsetMessageForCCVPN(cllId, newBandwidth, owner)
+        );
+    }
+    // check if an adjustment is necessary
+    private boolean needAdjust(String serivceId, double used, int provBandwidth, int upper){
+        log.debug("CCVPN Service Usage Analysis: usage: {}, threshold: {}, currentProvisioned {}, upperbound {}",
+                used, threshold, provBandwidth, upper);
+        return provBandwidth > upper || used > threshold * provBandwidth;
+    }
+
+    // calculate new bandwidth to accomodate customer
+    private int needAdjustTo(String serivceId, double used, int cur, int upper){
+        if (cur >= upper){
+            return upper;
+        }
+        int expected = (int) (Math.ceil((used / threshold) * 1.2 / precision) * precision);
+        return Math.min(expected, upper);
+    }
+    // check is service under maint
+    private boolean isServiceUnderMaintenance(String serivceId) {
+        return ccvpnPmDatastore.getStatusOfSvc(serivceId) == ServiceState.UNDER_MAINTENANCE;
+    }
+    // get a collection of service under maint
+    private Map<String, ServiceState> getServicesUnderMaintenance(){
+        return ccvpnPmDatastore.getSvcStatusMap().entrySet()
+                .stream()
+                .filter(e -> e.getValue() == ServiceState.UNDER_MAINTENANCE)
+                .collect(Collectors.toMap(p -> p.getKey(), p -> p.getValue()));
+    }
+}