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/*-
* ============LICENSE_START=======================================================
* Copyright (C) 2021 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.clamp.controlloop.participant.intermediary.handler;
import java.util.List;
import java.util.concurrent.atomic.AtomicReference;
import javax.ws.rs.core.Response.Status;
import lombok.Getter;
import lombok.experimental.Delegate;
import org.onap.policy.clamp.controlloop.common.exception.ControlLoopRuntimeException;
import org.onap.policy.clamp.controlloop.participant.intermediary.comm.ControlLoopUpdateListener;
import org.onap.policy.clamp.controlloop.participant.intermediary.comm.ParticipantStatusPublisher;
import org.onap.policy.clamp.controlloop.participant.intermediary.parameters.ParticipantIntermediaryParameters;
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;
/**
* This class activates the Participant Intermediary together with all its handlers.
*/
public class IntermediaryActivator extends ServiceManagerContainer {
// Name of the message type for messages on topics
private static final String[] MSG_TYPE_NAMES = {"messageType"};
@Getter
private final ParticipantIntermediaryParameters parameters;
// Topics from which the participant receives and to which the participant sends messages
private List<TopicSink> topicSinks;
private List<TopicSource> topicSources;
// The participant handler for this intermediary
final AtomicReference<ParticipantHandler> participantHandler = new AtomicReference<>();
/**
* Listens for messages on the topic, decodes them into a message, and then dispatches them.
*/
private final MessageTypeDispatcher msgDispatcher;
/**
* Instantiate the activator for participant.
*
* @param parameters the parameters for the participant intermediary
*/
public IntermediaryActivator(final ParticipantIntermediaryParameters parameters) {
this.parameters = parameters;
topicSinks =
TopicEndpointManager.getManager().addTopicSinks(parameters.getClampControlLoopTopics().getTopicSinks());
topicSources = TopicEndpointManager.getManager()
.addTopicSources(parameters.getClampControlLoopTopics().getTopicSources());
try {
this.msgDispatcher = new MessageTypeDispatcher(MSG_TYPE_NAMES);
} catch (final RuntimeException e) {
throw new ControlLoopRuntimeException(Status.INTERNAL_SERVER_ERROR,
"topic message dispatcher failed to start", e);
}
// @formatter:off
final AtomicReference<ParticipantStatusPublisher> statusPublisher = new AtomicReference<>();
final AtomicReference<ControlLoopUpdateListener> controlLoopUpdateListener = new AtomicReference<>();
addAction("Topic endpoint management",
() -> TopicEndpointManager.getManager().start(),
() -> TopicEndpointManager.getManager().shutdown());
addAction("Participant Status Publisher",
() -> statusPublisher.set(new ParticipantStatusPublisher(topicSinks)),
() -> statusPublisher.get().close());
addAction("Participant Handler",
() -> participantHandler.set(new ParticipantHandler(parameters, statusPublisher.get())),
() -> participantHandler.get().close());
addAction("Control Loop Update Listener",
() -> controlLoopUpdateListener.set(new ControlLoopUpdateListener(participantHandler.get())),
() -> controlLoopUpdateListener.get().close());
addAction("Topic Message Dispatcher", this::registerMsgDispatcher, this::unregisterMsgDispatcher);
// @formatter:on
}
/**
* 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);
}
}
/**
* Return the participant handler.
*/
public ParticipantHandler getParticipantHandler() {
return participantHandler.get();
}
}
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