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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.runtime.main.startstop;
import java.util.List;
import javax.ws.rs.core.Response.Status;
import org.onap.policy.clamp.controlloop.common.exception.ControlLoopRuntimeException;
import org.onap.policy.clamp.controlloop.runtime.main.parameters.ClRuntimeParameterGroup;
import org.onap.policy.common.endpoints.event.comm.TopicEndpointManager;
import org.onap.policy.common.endpoints.event.comm.TopicSource;
import org.onap.policy.common.endpoints.listeners.MessageTypeDispatcher;
import org.onap.policy.common.parameters.ParameterService;
import org.onap.policy.common.utils.services.ServiceManagerContainer;
/**
* This class activates the control loop runtime component as a complete service together with all its controllers,
* listeners & handlers.
*/
public class ClRuntimeActivator extends ServiceManagerContainer {
// Name of the message type for messages on topics
private static final String[] MSG_TYPE_NAMES = {"messageType"};
private final ClRuntimeParameterGroup clRuntimeParameterGroup;
// Topics from which the application receives and to which the application sends messages
private List<TopicSource> topicSources;
/**
* Listens for messages on the topic, decodes them into a message, and then dispatches them.
*/
private final MessageTypeDispatcher msgDispatcher;
/**
* Instantiate the activator for the control loop runtime as a complete service.
*
* @param clRuntimeParameterGroup the parameters for the control loop runtime service
*/
public ClRuntimeActivator(final ClRuntimeParameterGroup clRuntimeParameterGroup) {
if (clRuntimeParameterGroup == null || !clRuntimeParameterGroup.isValid()) {
throw new ControlLoopRuntimeException(Status.INTERNAL_SERVER_ERROR, "ParameterGroup not valid");
}
this.clRuntimeParameterGroup = clRuntimeParameterGroup;
topicSources = TopicEndpointManager.getManager()
.addTopicSources(clRuntimeParameterGroup.getTopicParameterGroup().getTopicSources());
try {
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
addAction("Control loop runtime parameters",
() -> ParameterService.register(clRuntimeParameterGroup),
() -> ParameterService.deregister(clRuntimeParameterGroup.getName()));
addAction("Topic endpoint management",
() -> TopicEndpointManager.getManager().start(),
() -> TopicEndpointManager.getManager().shutdown());
addAction("Topic Message Dispatcher", this::registerMsgDispatcher, this::unregisterMsgDispatcher);
clRuntimeParameterGroup.getRestServerParameters().setName(clRuntimeParameterGroup.getName());
// @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);
}
}
/**
* Get the parameters used by the activator.
*
* @return the parameters of the activator
*/
public ClRuntimeParameterGroup getParameterGroup() {
return clRuntimeParameterGroup;
}
}
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