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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.exception.ApexStarterException;
import org.onap.policy.apex.starter.handler.CommunicationHandler;
import org.onap.policy.apex.starter.handler.PdpMessageHandler;
import org.onap.policy.apex.starter.parameters.ApexStarterParameterGroup;
import org.onap.policy.apex.starter.parameters.PdpStatusParameters;
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.parameters.ParameterService;
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 CommunicationHandler communicationHandler;
/**
* 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) {
final List<TopicSink> topicSinks = TopicEndpoint.manager.addTopicSinks(topicProperties);
final List<TopicSource> topicSources = TopicEndpoint.manager.addTopicSources(topicProperties);
this.apexStarterParameterGroup = apexStarterParameterGroup;
// 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;
// @formatter:off
this.manager = new ServiceManager()
.addAction("topics",
() -> TopicEndpoint.manager.start(),
() -> TopicEndpoint.manager.shutdown())
.addAction("set alive",
() -> setAlive(true),
() -> setAlive(false))
.addAction("register context map",
() -> Registry.register(ApexStarterConstants.REG_PDP_STATUS_OBJECT,
new PdpMessageHandler().createPdpStatusFromParameters(instanceId,
apexStarterParameterGroup.getPdpStatusParameters())),
() -> Registry.unregister(ApexStarterConstants.REG_PDP_STATUS_OBJECT))
.addAction("register parameters",
() -> registerToParameterService(apexStarterParameterGroup),
() -> deregisterToParameterService(apexStarterParameterGroup))
.addAction("Communication handler",
() -> startCommunicationHandler(topicSinks, topicSources,
apexStarterParameterGroup.getPdpStatusParameters()),
() -> communicationHandler.stop());
// @formatter:on
}
/**
* 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();
} 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;
}
/**
* Method to register the parameters to Common Parameter Service.
*
* @param apexStarterParameterGroup the apex starter parameter group
*/
public void registerToParameterService(final ApexStarterParameterGroup apexStarterParameterGroup) {
ParameterService.register(apexStarterParameterGroup);
}
/**
* Method to deregister the parameters from Common Parameter Service.
*
* @param apexStarterParameterGroup the apex starter parameter group
*/
public void deregisterToParameterService(final ApexStarterParameterGroup apexStarterParameterGroup) {
ParameterService.deregister(apexStarterParameterGroup.getName());
}
/**
* Starts the communication handler which handles the communication between apex pdp and pap.
*
* @param pdpStatusParameters
* @param topicSources
* @param topicSinks
*
* @throws ApexStarterException if the handler start fails
*/
public void startCommunicationHandler(final List<TopicSink> topicSinks, final List<TopicSource> topicSources,
final PdpStatusParameters pdpStatusParameters) throws ApexStarterException {
communicationHandler = new CommunicationHandler(topicSinks, topicSources, pdpStatusParameters);
if (!communicationHandler.start()) {
throw new ApexStarterException("Failed to start the communication handler for ApexStarter");
}
}
}
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