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/*-
* ============LICENSE_START=======================================================
* Copyright (C) 2019 Nordix Foundation.
* Modifications Copyright (C) 2019-2021 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.models.sim.pdp;
import java.util.List;
import java.util.Random;
import lombok.Getter;
import lombok.Setter;
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.Registry;
import org.onap.policy.common.utils.services.ServiceManager;
import org.onap.policy.common.utils.services.ServiceManagerException;
import org.onap.policy.models.pdp.enums.PdpMessageType;
import org.onap.policy.models.sim.pdp.comm.PdpStateChangeListener;
import org.onap.policy.models.sim.pdp.comm.PdpStatusPublisher;
import org.onap.policy.models.sim.pdp.comm.PdpUpdateListener;
import org.onap.policy.models.sim.pdp.exception.PdpSimulatorException;
import org.onap.policy.models.sim.pdp.exception.PdpSimulatorRunTimeException;
import org.onap.policy.models.sim.pdp.handler.PdpMessageHandler;
import org.onap.policy.models.sim.pdp.parameters.PdpSimulatorParameterGroup;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* This class activates the PdpSimulator as a complete service together with all its handlers.
*
* @author Ajith Sreekumar (ajith.sreekumar@est.tech)
*/
public class PdpSimulatorActivator {
private static final Logger LOGGER = LoggerFactory.getLogger(PdpSimulatorActivator.class);
private final PdpSimulatorParameterGroup pdpSimulatorParameterGroup;
private final List<TopicSink> topicSinks; // topics to which pdp sends pdp status
private final List<TopicSource> topicSources; // topics to which pdp listens to for messages from pap.
private static final String[] MSG_TYPE_NAMES = { "messageName" };
/*
* This simulator is only used for testing. Consequently, it is safe to use a simple
* random number generator, thus the sonar is disabled.
*/
private static final Random RANDOM = new Random(); // NOSONAR
/**
* 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 final ServiceManager manager;
@Getter
@Setter(lombok.AccessLevel.PRIVATE)
private volatile boolean alive = false;
/**
* Instantiate the activator for onappf PDP-A.
*
* @param pdpSimulatorParameterGroup the parameters for the onappf PDP-A service
*/
public PdpSimulatorActivator(final PdpSimulatorParameterGroup pdpSimulatorParameterGroup) {
topicSinks = TopicEndpointManager.getManager()
.addTopicSinks(pdpSimulatorParameterGroup.getTopicParameterGroup().getTopicSinks());
topicSources = TopicEndpointManager.getManager()
.addTopicSources(pdpSimulatorParameterGroup.getTopicParameterGroup().getTopicSources());
final var random = RANDOM.nextInt();
final String instanceId = "pdp_" + random;
LOGGER.debug("PdpSimulatorActivator initializing with instance id: {}", instanceId);
try {
this.pdpSimulatorParameterGroup = pdpSimulatorParameterGroup;
this.msgDispatcher = new MessageTypeDispatcher(MSG_TYPE_NAMES);
} catch (final RuntimeException e) {
throw new PdpSimulatorRunTimeException(e);
}
final var pdpUpdateListener = new PdpUpdateListener();
final var pdpStateChangeListener = new PdpStateChangeListener();
// @formatter:off
this.manager = new ServiceManager()
.addAction("topics",
TopicEndpointManager.getManager()::start,
TopicEndpointManager.getManager()::shutdown)
.addAction("set alive",
() -> setAlive(true),
() -> setAlive(false))
.addAction("register pdp status context object",
() -> Registry.register(PdpSimulatorConstants.REG_PDP_STATUS_OBJECT,
new PdpMessageHandler().createPdpStatusFromParameters(instanceId,
pdpSimulatorParameterGroup.getPdpStatusParameters())),
() -> Registry.unregister(PdpSimulatorConstants.REG_PDP_STATUS_OBJECT))
.addAction("topic sinks",
() -> Registry.register(PdpSimulatorConstants.REG_PDP_TOPIC_SINKS, topicSinks),
() -> Registry.unregister(PdpSimulatorConstants.REG_PDP_TOPIC_SINKS))
.addAction("Pdp Status publisher",
() -> Registry.register(PdpSimulatorConstants.REG_PDP_STATUS_PUBLISHER,
new PdpStatusPublisher(topicSinks,
pdpSimulatorParameterGroup.getPdpStatusParameters().getTimeIntervalMs())),
this::stopAndRemovePdpStatusPublisher)
.addAction("Register pdp update listener",
() -> msgDispatcher.register(PdpMessageType.PDP_UPDATE.name(), pdpUpdateListener),
() -> msgDispatcher.unregister(PdpMessageType.PDP_UPDATE.name()))
.addAction("Register pdp state change request dispatcher",
() -> msgDispatcher.register(PdpMessageType.PDP_STATE_CHANGE.name(), pdpStateChangeListener),
() -> msgDispatcher.unregister(PdpMessageType.PDP_STATE_CHANGE.name()))
.addAction("Message Dispatcher",
this::registerMsgDispatcher,
this::unregisterMsgDispatcher);
// @formatter:on
}
/**
* Method to stop and unregister the pdp status publisher.
*/
private void stopAndRemovePdpStatusPublisher() {
final var pdpStatusPublisher =
Registry.get(PdpSimulatorConstants.REG_PDP_STATUS_PUBLISHER, PdpStatusPublisher.class);
pdpStatusPublisher.terminate();
Registry.unregister(PdpSimulatorConstants.REG_PDP_STATUS_PUBLISHER);
}
/**
* Initialize PdpSimulator service.
*
* @throws PdpSimulatorException on errors in initializing the service
*/
public void initialize() throws PdpSimulatorException {
if (isAlive()) {
throw new IllegalStateException("activator already initialized");
}
try {
LOGGER.debug("PdpSimulator starting as a service . . .");
manager.start();
LOGGER.debug("PdpSimulator started as a service");
} catch (final ServiceManagerException exp) {
LOGGER.error("PdpSimulator service startup failed");
throw new PdpSimulatorException(exp.getMessage(), exp);
}
}
/**
* Terminate PdpSimulator.
*
* @throws PdpSimulatorException on errors in terminating the service
*/
public void terminate() throws PdpSimulatorException {
if (!isAlive()) {
throw new IllegalStateException("activator is not running");
}
try {
final var pdpStatusPublisher =
Registry.get(PdpSimulatorConstants.REG_PDP_STATUS_PUBLISHER, PdpStatusPublisher.class);
// send a final heartbeat with terminated status
pdpStatusPublisher.send(new PdpMessageHandler().getTerminatedPdpStatus());
manager.stop();
Registry.unregister(PdpSimulatorConstants.REG_PDP_SIMULATOR_ACTIVATOR);
} catch (final ServiceManagerException exp) {
LOGGER.error("PdpSimulator termination failed");
throw new PdpSimulatorException(exp.getMessage(), exp);
}
}
/**
* Get the parameters used by the activator.
*
* @return pdpSimulatorParameterGroup the parameters of the activator
*/
public PdpSimulatorParameterGroup getParameterGroup() {
return pdpSimulatorParameterGroup;
}
/**
* 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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