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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;
import java.util.List;
import java.util.Properties;
import lombok.Getter;
import lombok.Setter;
import org.onap.policy.apex.starter.comm.PdpStateChangeListener;
import org.onap.policy.apex.starter.comm.PdpStatusPublisher;
import org.onap.policy.apex.starter.comm.PdpUpdateListener;
import org.onap.policy.apex.starter.exception.ApexStarterException;
import org.onap.policy.apex.starter.exception.ApexStarterRunTimeException;
import org.onap.policy.apex.starter.handler.PdpMessageHandler;
import org.onap.policy.apex.starter.parameters.ApexStarterParameterGroup;
import org.onap.policy.common.endpoints.event.comm.TopicEndpoint;
import org.onap.policy.common.endpoints.event.comm.TopicSink;
import org.onap.policy.common.endpoints.event.comm.TopicSource;
import org.onap.policy.common.endpoints.listeners.MessageTypeDispatcher;
import org.onap.policy.common.utils.services.Registry;
import org.onap.policy.common.utils.services.ServiceManager;
import org.onap.policy.common.utils.services.ServiceManagerException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* This class activates the ApexStarter as a complete service together with all its handlers.
*
* @author Ajith Sreekumar (ajith.sreekumar@est.tech)
*/
public class ApexStarterActivator {
private static final Logger LOGGER = LoggerFactory.getLogger(ApexStarterActivator.class);
private final ApexStarterParameterGroup apexStarterParameterGroup;
private List<TopicSink> topicSinks;// topics to which apex-pdp sends pdp status
private List<TopicSource> topicSources; // topics to which apex-pdp listens to for messages from pap.
private static final String[] MSG_TYPE_NAMES = { "messageName" };
/**
* Listens for messages on the topic, decodes them into a message, and then dispatches them.
*/
private final MessageTypeDispatcher msgDispatcher;
/**
* Used to manage the services.
*/
private ServiceManager manager;
@Getter
@Setter(lombok.AccessLevel.PRIVATE)
private volatile boolean alive = false;
public ApexStarterActivator(final ApexStarterParameterGroup apexStarterParameterGroup,
final Properties topicProperties) {
topicSinks = TopicEndpoint.manager.addTopicSinks(topicProperties);
topicSources = TopicEndpoint.manager.addTopicSources(topicProperties);
// TODO: instanceId currently set as a random string, could be fetched from actual deployment
final int random = (int) (Math.random() * 100);
final String instanceId = "apex_" + random;
try {
this.apexStarterParameterGroup = apexStarterParameterGroup;
this.msgDispatcher = new MessageTypeDispatcher(MSG_TYPE_NAMES);
} catch (final RuntimeException e) {
throw new ApexStarterRunTimeException(e);
}
final PdpUpdateListener pdpUpdateListener = new PdpUpdateListener();
final PdpStateChangeListener pdpStateChangeListener = new PdpStateChangeListener();
// @formatter:off
this.manager = new ServiceManager()
.addAction("topics",
() -> TopicEndpoint.manager.start(),
() -> TopicEndpoint.manager.shutdown())
.addAction("set alive",
() -> setAlive(true),
() -> setAlive(false))
.addAction("register pdp status context object",
() -> Registry.register(ApexStarterConstants.REG_PDP_STATUS_OBJECT,
new PdpMessageHandler().createPdpStatusFromParameters(instanceId,
apexStarterParameterGroup.getPdpStatusParameters())),
() -> Registry.unregister(ApexStarterConstants.REG_PDP_STATUS_OBJECT))
.addAction("topic sinks",
() -> Registry.register(ApexStarterConstants.REG_APEX_PDP_TOPIC_SINKS, topicSinks),
() -> Registry.unregister(ApexStarterConstants.REG_APEX_PDP_TOPIC_SINKS))
.addAction("Pdp Status publisher",
() -> Registry.register(ApexStarterConstants.REG_PDP_STATUS_PUBLISHER,
new PdpStatusPublisher(topicSinks,
apexStarterParameterGroup.getPdpStatusParameters().getTimeIntervalMs())),
() -> stopAndRemovePdpStatusPublisher())
.addAction("Register pdp update listener",
() -> msgDispatcher.register("PDP_UPDATE", pdpUpdateListener),
() -> msgDispatcher.unregister("PDP_UPDATE"))
.addAction("Register pdp state change request dispatcher",
() -> msgDispatcher.register("PDP_STATE_CHANGE", pdpStateChangeListener),
() -> msgDispatcher.unregister("PDP_STATE_CHANGE"))
.addAction("Message Dispatcher",
() -> registerMsgDispatcher(),
() -> unregisterMsgDispatcher());
// @formatter:on
}
/**
* Method to stop and unregister the pdp status publisher.
*/
private void stopAndRemovePdpStatusPublisher() {
final PdpStatusPublisher pdpStatusPublisher =
Registry.get(ApexStarterConstants.REG_PDP_STATUS_PUBLISHER, PdpStatusPublisher.class);
// send a final heartbeat with terminated status
pdpStatusPublisher.send(new PdpMessageHandler().getTerminatedPdpStatus());
pdpStatusPublisher.terminate();
Registry.unregister(ApexStarterConstants.REG_PDP_STATUS_PUBLISHER);
}
/**
* Initialize ApexStarter service.
*
* @throws ApexStarterException on errors in initializing the service
*/
public void initialize() throws ApexStarterException {
if (isAlive()) {
throw new IllegalStateException("activator already initialized");
}
try {
LOGGER.debug("ApexStarter starting as a service . . .");
manager.start();
LOGGER.debug("ApexStarter started as a service");
} catch (final ServiceManagerException exp) {
LOGGER.error("ApexStarter service startup failed");
throw new ApexStarterException(exp.getMessage(), exp);
}
}
/**
* Terminate ApexStarter.
*
* @throws ApexStarterException on errors in terminating the service
*/
public void terminate() throws ApexStarterException {
if (!isAlive()) {
throw new IllegalStateException("activator is not running");
}
try {
manager.stop();
Registry.unregister(ApexStarterConstants.REG_APEX_STARTER_ACTIVATOR);
} catch (final ServiceManagerException exp) {
LOGGER.error("ApexStarter termination failed");
throw new ApexStarterException(exp.getMessage(), exp);
}
}
/**
* Get the parameters used by the activator.
*
* @return the parameters of the activator
*/
public ApexStarterParameterGroup getParameterGroup() {
return apexStarterParameterGroup;
}
/**
* Registers the dispatcher with the topic source(s).
*/
private void registerMsgDispatcher() {
for (final TopicSource source : topicSources) {
source.register(msgDispatcher);
}
}
/**
* Unregisters the dispatcher from the topic source(s).
*/
private void unregisterMsgDispatcher() {
for (final TopicSource source : topicSources) {
source.unregister(msgDispatcher);
}
}
}
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