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/*-
* ============LICENSE_START=======================================================
* Copyright (C) 2019-2021 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.Arrays;
import lombok.Getter;
import org.onap.policy.common.utils.cmd.CommandLineException;
import org.onap.policy.common.utils.services.Registry;
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.parameters.PdpSimulatorParameterGroup;
import org.onap.policy.models.sim.pdp.parameters.PdpSimulatorParameterHandler;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* This class initiates PdpSimulator.
*
* @author Ajith Sreekumar (ajith.sreekumar@est.tech)
*/
public class PdpSimulatorMain {
private static final String PDP_SIMULATOR_FAIL_MSG = "start of pdp simulator failed";
private static final Logger LOGGER = LoggerFactory.getLogger(PdpSimulatorMain.class);
private PdpSimulatorActivator activator;
@Getter
private PdpSimulatorParameterGroup parameters;
/**
* Instantiates the PdpSimulator.
*
* @param args the command line arguments
*/
public PdpSimulatorMain(final String[] args) {
if (LOGGER.isInfoEnabled()) {
LOGGER.info("In PdpSimulator with parameters {}", Arrays.toString(args));
}
// Check the arguments
final var arguments = new PdpSimulatorCommandLineArguments();
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.debug(argumentMessage);
return;
}
// Validate that the arguments are sane
arguments.validate();
} catch (final PdpSimulatorRunTimeException | CommandLineException e) {
LOGGER.error(PDP_SIMULATOR_FAIL_MSG, e);
return;
}
// Read the parameters
try {
parameters = new PdpSimulatorParameterHandler().getParameters(arguments);
} catch (final Exception e) {
LOGGER.error(PDP_SIMULATOR_FAIL_MSG, e);
return;
}
// create the activator
activator = new PdpSimulatorActivator(parameters);
Registry.register(PdpSimulatorConstants.REG_PDP_SIMULATOR_ACTIVATOR, activator);
// Start the activator
try {
activator.initialize();
} catch (final PdpSimulatorException e) {
LOGGER.error("start of PdpSimulator failed, used parameters are {}", Arrays.toString(args), e);
Registry.unregister(PdpSimulatorConstants.REG_PDP_SIMULATOR_ACTIVATOR);
return;
}
// Add a shutdown hook to shut everything down in an orderly manner
Runtime.getRuntime().addShutdownHook(new PdpSimulatorShutdownHookClass());
LOGGER.info("Started PdpSimulator service");
}
/**
* Shut down Execution.
*
* @throws PdpSimulatorException on shutdown errors
*/
public void shutdown() throws PdpSimulatorException {
// clear the parameterGroup variable
parameters = null;
// clear the pdp simulator activator
if (activator != null && activator.isAlive()) {
activator.terminate();
}
}
/**
* The Class PdpSimulatorShutdownHookClass terminates the pdp simulator when its run method is called.
*/
private class PdpSimulatorShutdownHookClass extends Thread {
/*
* (non-Javadoc)
*
* @see java.lang.Runnable#run()
*/
@Override
public void run() {
try {
// Shutdown the pdp simulator service and wait for everything to stop
if (activator != null && activator.isAlive()) {
activator.terminate();
}
} catch (final PdpSimulatorException e) {
LOGGER.warn("error occured during shut down of the pdp simulator service", e);
}
}
}
/**
* The main method. Arguments are validated in the constructor thus adding the NOSONAR.
*
* @param args the arguments
*
*/
public static void main(final String[] args) { // NOSONAR
/*
* The arguments are validated by the constructor, thus sonar is disabled.
*/
new PdpSimulatorMain(args);
}
}
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