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/*-
* ============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 (isMessageRelevant(pdpStateChangeMsg, pdpStatusContext)) {
switch (pdpStateChangeMsg.getState()) {
case TERMINATED:
pdpResponseDetails = handleTerminatedState(pdpStateChangeMsg, pdpStatusContext, pdpMessageHandler);
break;
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);
pdpStatusPublisher.send(pdpStatus);
}
}
/**
* Check if the pdp state change message is meant for this pdp.
*
* @param pdpStateChangeMsg
* @param pdpStatusContext
* @return boolean value if relevant or not
*/
private boolean isMessageRelevant(final PdpStateChange pdpStateChangeMsg, final PdpStatus pdpStatusContext) {
return pdpStatusContext.getName().equals(pdpStateChangeMsg.getName()) || (null == pdpStateChangeMsg.getName()
&& pdpStateChangeMsg.getPdpGroup().equals(pdpStatusContext.getPdpGroup())
&& pdpStateChangeMsg.getPdpSubgroup().equals(pdpStatusContext.getPdpSubgroup()));
}
/**
* 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.register(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;
}
/**
* Method to handle when the new state from pap is terminated.
*
* @param pdpStateChangeMsg
* @param pdpStatusPublisher
* @param pdpMessageHandler
* @return pdpResponseDetails
*/
private PdpResponseDetails handleTerminatedState(final PdpStateChange pdpStateChangeMsg,
final PdpStatus pdpStatusContext, final PdpMessageHandler pdpMessageHandler) {
PdpResponseDetails pdpResponseDetails;
if (pdpStatusContext.getState().equals(PdpState.ACTIVE)) {
final ApexEngineHandler apexEngineHandler = Registry.get(ApexStarterConstants.REG_APEX_ENGINE_HANDLER);
try {
apexEngineHandler.shutdown();
pdpStatusContext.setState(PdpState.PASSIVE);
pdpResponseDetails = pdpMessageHandler.createPdpResonseDetails(pdpStateChangeMsg.getRequestId(),
PdpResponseStatus.SUCCESS, "Apex Engine stopped. State changed to passive.");
} catch (final Exception e) {
pdpResponseDetails = pdpMessageHandler.createPdpResonseDetails(pdpStateChangeMsg.getRequestId(),
PdpResponseStatus.FAIL,
"Stopping apex engine failed. State cannot be changed." + e.getMessage());
}
} else {
pdpResponseDetails = pdpMessageHandler.createPdpResonseDetails(pdpStateChangeMsg.getRequestId(),
PdpResponseStatus.SUCCESS, "Pdp already in passive state");
}
return pdpResponseDetails;
}
}
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