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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.dcae.main.startstop;
import java.util.Arrays;
import javax.ws.rs.core.Response;
import lombok.Getter;
import org.onap.policy.clamp.controlloop.common.ControlLoopConstants;
import org.onap.policy.clamp.controlloop.common.exception.ControlLoopException;
import org.onap.policy.clamp.controlloop.common.exception.ControlLoopRuntimeException;
import org.onap.policy.clamp.controlloop.participant.dcae.main.parameters.ParticipantDcaeParameterHandler;
import org.onap.policy.clamp.controlloop.participant.dcae.main.parameters.ParticipantDcaeParameters;
import org.onap.policy.common.utils.resources.MessageConstants;
import org.onap.policy.common.utils.services.Registry;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* This class initiates ONAP Policy Framework Control Loop participant component.
*/
public class Main {
private static final Logger LOGGER = LoggerFactory.getLogger(Main.class);
private ParticipantDcaeActivator activator;
@Getter
private ParticipantDcaeParameters parameterGroup;
/**
* Instantiates the control loop participant service.
*
* @param args the command line arguments
*/
public Main(final String[] args) {
final String argumentString = Arrays.toString(args);
LOGGER.info("Starting the control loop participant service with arguments - {}", argumentString);
// Check the arguments
final ParticipantDcaeCommandLineArguments arguments = new ParticipantDcaeCommandLineArguments();
try {
// The arguments return a string if there is a message to print and we should exit
final String argumentMessage = arguments.parse(args);
if (argumentMessage != null) {
LOGGER.info(argumentMessage);
return;
}
// Validate that the arguments are sane
arguments.validate();
// Read the parameters
parameterGroup = new ParticipantDcaeParameterHandler().getParameters(arguments);
// Now, create the activator for the service
activator = new ParticipantDcaeActivator(parameterGroup);
Registry.register(ControlLoopConstants.REG_CLRUNTIME_ACTIVATOR, activator);
// Start the activator
activator.start();
} catch (Exception exp) {
if (null != activator) {
Registry.unregister(ControlLoopConstants.REG_CLRUNTIME_ACTIVATOR);
}
throw new ControlLoopRuntimeException(Response.Status.BAD_REQUEST,
String.format(MessageConstants.START_FAILURE_MSG, MessageConstants.POLICY_CLAMP), exp);
}
// Add a shutdown hook to shut everything down in an orderly manner
Runtime.getRuntime().addShutdownHook(new ClRuntimeShutdownHookClass());
String successMsg = String.format(MessageConstants.START_SUCCESS_MSG, MessageConstants.POLICY_CLAMP);
LOGGER.info(successMsg);
}
/**
* Check if main is running.
*/
public boolean isRunning() {
return activator != null && activator.isAlive();
}
/**
* Shut down Execution.
*
* @throws ControlLoopException on shutdown errors
*/
public void shutdown() throws ControlLoopException {
// clear the parameterGroup variable
parameterGroup = null;
// clear the cl participant activator
if (activator != null) {
activator.stop();
}
}
/**
* The Class ClRuntimeShutdownHookClass terminates the control loop participant service
* when its run method is called.
*/
private class ClRuntimeShutdownHookClass extends Thread {
/*
* (non-Javadoc)
*
* @see java.lang.Runnable#run()
*/
@Override
public void run() {
if (!activator.isAlive()) {
return;
}
try {
// Shutdown the control loop participant service and wait for everything to stop
activator.stop();
} catch (final RuntimeException e) {
LOGGER.warn("error occured during shut down of the control loop participant service", e);
}
}
}
/**
* The main method.
*
* @param args the arguments
*/
public static void main(final String[] args) { // NOSONAR
/*
* NOTE: arguments are validated by the constructor, thus sonar is disabled.
*/
new Main(args);
}
}
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