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/*-
* ============LICENSE_START=======================================================
* Copyright (C) 2021 Nordix Foundation.
* Modifications Copyright (C) 2021 AT&T Intellectual Property. 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=========================================================
*/
package org.onap.policy.clamp.acm.participant.intermediary.handler;
import java.io.Closeable;
import java.io.IOException;
import java.util.List;
import lombok.Getter;
import org.onap.policy.clamp.acm.participant.intermediary.parameters.ParticipantParameters;
import org.onap.policy.common.endpoints.event.comm.TopicEndpointManager;
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.ServiceManagerContainer;
import org.springframework.context.event.ContextClosedEvent;
import org.springframework.context.event.ContextRefreshedEvent;
import org.springframework.context.event.EventListener;
import org.springframework.stereotype.Component;
/**
* This class activates the Participant Intermediary together with all its handlers.
*/
@Component
public class IntermediaryActivator extends ServiceManagerContainer implements Closeable {
private static final String[] MSG_TYPE_NAMES = {"messageType"};
// Topics from which the participant receives and to which the participant sends messages
private List<TopicSink> topicSinks;
private List<TopicSource> topicSources;
private ParticipantHandler participantHandler;
@Getter
private final MessageTypeDispatcher msgDispatcher;
/**
* Instantiate the activator for participant.
*
* @param parameters the ParticipantParameters
* @param participantHandler the ParticipantHandler
* @param publishers list of Publishers
* @param listeners list of Listeners
*/
public <T> IntermediaryActivator(final ParticipantParameters parameters, ParticipantHandler participantHandler,
List<Publisher> publishers, List<Listener<T>> listeners) {
this.participantHandler = participantHandler;
topicSinks = TopicEndpointManager.getManager().addTopicSinks(
parameters.getIntermediaryParameters().getClampAutomationCompositionTopics().getTopicSinks());
topicSources = TopicEndpointManager.getManager().addTopicSources(
parameters.getIntermediaryParameters().getClampAutomationCompositionTopics().getTopicSources());
msgDispatcher = new MessageTypeDispatcher(MSG_TYPE_NAMES);
// @formatter:off
addAction("Topic endpoint management",
() -> TopicEndpointManager.getManager().start(),
() -> TopicEndpointManager.getManager().shutdown());
publishers.forEach(publisher ->
addAction("Publisher " + publisher.getClass().getSimpleName(),
() -> publisher.active(topicSinks),
publisher::stop));
listeners.forEach(listener ->
addAction("Listener " + listener.getClass().getSimpleName(),
() -> msgDispatcher.register(listener.getType(), listener.getScoListener()),
() -> msgDispatcher.unregister(listener.getType())));
addAction("Topic Message Dispatcher", this::registerMsgDispatcher, this::unregisterMsgDispatcher);
// @formatter:on
}
/**
* Handle ContextRefreshEvent.
*
* @param ctxRefreshedEvent ContextRefreshedEvent
*/
@EventListener
public void handleContextRefreshEvent(ContextRefreshedEvent ctxRefreshedEvent) {
if (!isAlive()) {
start();
sendParticipantRegister();
}
}
/**
* Handle ContextClosedEvent.
*
* @param ctxClosedEvent ContextClosedEvent
*/
@EventListener
public void handleContextClosedEvent(ContextClosedEvent ctxClosedEvent) {
if (isAlive()) {
sendParticipantDeregister();
stop();
}
}
private void sendParticipantRegister() {
participantHandler.sendParticipantRegister();
}
private void sendParticipantDeregister() {
participantHandler.sendParticipantDeregister();
}
/**
* 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);
}
}
@Override
public void close() throws IOException {
if (isAlive()) {
super.shutdown();
}
}
}
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