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
|
/*-
* ============LICENSE_START=======================================================
* Copyright (C) 2019 Nordix Foundation.
* ================================================================================
* 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=========================================================
*/
package org.onap.policy.apex.starter.handler;
import java.util.List;
import org.onap.policy.apex.starter.ApexStarterConstants;
import org.onap.policy.apex.starter.comm.PdpStatusPublisher;
import org.onap.policy.apex.starter.engine.ApexEngineHandler;
import org.onap.policy.apex.starter.exception.ApexStarterException;
import org.onap.policy.common.utils.services.Registry;
import org.onap.policy.models.pdp.concepts.PdpResponseDetails;
import org.onap.policy.models.pdp.concepts.PdpStateChange;
import org.onap.policy.models.pdp.concepts.PdpStatus;
import org.onap.policy.models.pdp.enums.PdpResponseStatus;
import org.onap.policy.models.pdp.enums.PdpState;
import org.onap.policy.models.tosca.authorative.concepts.ToscaPolicy;
/**
* This class supports the handling of pdp state change messages.
*
* @author Ajith Sreekumar (ajith.sreekumar@est.tech)
*/
public class PdpStateChangeMessageHandler {
/**
* Method which handles a pdp state change event from PAP.
*
* @param pdpStateChangeMsg pdp state change message
*/
public void handlePdpStateChangeEvent(final PdpStateChange pdpStateChangeMsg) {
final PdpStatus pdpStatusContext = Registry.get(ApexStarterConstants.REG_PDP_STATUS_OBJECT, PdpStatus.class);
final PdpStatusPublisher pdpStatusPublisher = Registry.get(ApexStarterConstants.REG_PDP_STATUS_PUBLISHER);
final PdpMessageHandler pdpMessageHandler = new PdpMessageHandler();
PdpResponseDetails pdpResponseDetails = null;
if (pdpStateChangeMsg.appliesTo(pdpStatusContext.getName(), pdpStatusContext.getPdpGroup(),
pdpStatusContext.getPdpSubgroup())) {
switch (pdpStateChangeMsg.getState()) {
case PASSIVE:
pdpResponseDetails = handlePassiveState(pdpStateChangeMsg, pdpStatusContext, pdpMessageHandler);
break;
case ACTIVE:
pdpResponseDetails = handleActiveState(pdpStateChangeMsg, pdpStatusContext, pdpMessageHandler);
break;
default:
break;
}
final PdpStatus pdpStatus = pdpMessageHandler.createPdpStatusFromContext();
pdpStatus.setResponse(pdpResponseDetails);
pdpStatus.setDescription("Pdp status response message for PdpStateChange");
pdpStatusPublisher.send(pdpStatus);
}
}
/**
* Method to handle when the new state from pap is active.
*
* @param pdpStateChangeMsg
* @param pdpStatusContext
* @param pdpMessageHandler
* @return pdpResponseDetails
*/
private PdpResponseDetails handleActiveState(final PdpStateChange pdpStateChangeMsg,
final PdpStatus pdpStatusContext, final PdpMessageHandler pdpMessageHandler) {
PdpResponseDetails pdpResponseDetails = null;
if (pdpStatusContext.getState().equals(PdpState.ACTIVE)) {
pdpResponseDetails = pdpMessageHandler.createPdpResonseDetails(pdpStateChangeMsg.getRequestId(),
PdpResponseStatus.SUCCESS, "Pdp already in active state");
} else {
final List<ToscaPolicy> policies = Registry.get(ApexStarterConstants.REG_APEX_TOSCA_POLICY_LIST);
if (policies.isEmpty()) {
pdpResponseDetails = pdpMessageHandler.createPdpResonseDetails(pdpStateChangeMsg.getRequestId(),
PdpResponseStatus.SUCCESS, "No policies found. Apex engine not running.");
} else {
try {
// assumed that the apex policies list contains only one entry.
final ApexEngineHandler apexEngineHandler =
new ApexEngineHandler((String) policies.get(0).getProperties().get("content"));
Registry.registerOrReplace(ApexStarterConstants.REG_APEX_ENGINE_HANDLER, apexEngineHandler);
pdpResponseDetails = pdpMessageHandler.createPdpResonseDetails(pdpStateChangeMsg.getRequestId(),
PdpResponseStatus.SUCCESS, "Apex engine started. State changed to active.");
pdpStatusContext.setState(PdpState.ACTIVE);
} catch (final ApexStarterException e) {
pdpResponseDetails = pdpMessageHandler.createPdpResonseDetails(pdpStateChangeMsg.getRequestId(),
PdpResponseStatus.FAIL, "Apex engine service running failed. " + e.getMessage());
}
}
}
return pdpResponseDetails;
}
/**
* Method to handle when the new state from pap is passive.
*
* @param pdpStateChangeMsg
* @param pdpStatusContext
* @param pdpMessageHandler
* @return pdpResponseDetails
*/
private PdpResponseDetails handlePassiveState(final PdpStateChange pdpStateChangeMsg,
final PdpStatus pdpStatusContext, final PdpMessageHandler pdpMessageHandler) {
PdpResponseDetails pdpResponseDetails = null;
if (pdpStatusContext.getState().equals(PdpState.PASSIVE)) {
pdpResponseDetails = pdpMessageHandler.createPdpResonseDetails(pdpStateChangeMsg.getRequestId(),
PdpResponseStatus.SUCCESS, "Pdp already in passive state");
} else {
final ApexEngineHandler apexEngineHandler = Registry.get(ApexStarterConstants.REG_APEX_ENGINE_HANDLER);
try {
apexEngineHandler.shutdown();
pdpResponseDetails = pdpMessageHandler.createPdpResonseDetails(pdpStateChangeMsg.getRequestId(),
PdpResponseStatus.SUCCESS, "Apex pdp state changed from Active to Passive.");
pdpStatusContext.setState(PdpState.PASSIVE);
} catch (final Exception e) {
pdpResponseDetails = pdpMessageHandler.createPdpResonseDetails(pdpStateChangeMsg.getRequestId(),
PdpResponseStatus.FAIL,
"Stopping apex engine failed. State cannot be changed to Passive." + e.getMessage());
}
}
return pdpResponseDetails;
}
}
|