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/*-
* ============LICENSE_START=======================================================
* Copyright (C) 2019 Nordix Foundation.
* Modifications Copyright (C) 2019 AT&T Intellectual Property.
* ================================================================================
* 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.pap.main.startstop;
import java.util.Arrays;
import org.onap.policy.common.utils.services.Registry;
import org.onap.policy.pap.main.PapConstants;
import org.onap.policy.pap.main.PolicyPapException;
import org.onap.policy.pap.main.parameters.PapParameterGroup;
import org.onap.policy.pap.main.parameters.PapParameterHandler;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* This class initiates ONAP Policy Framework PAP component.
*
* @author Ram Krishna Verma (ram.krishna.verma@est.tech)
*/
public class Main {
private static final String START_FAILED = "start of policy pap service failed";
private static final Logger LOGGER = LoggerFactory.getLogger(Main.class);
private PapActivator activator;
private PapParameterGroup parameterGroup;
/**
* Instantiates the policy pap service.
*
* @param args the command line arguments
*/
public Main(final String[] args) {
final String argumentString = Arrays.toString(args);
LOGGER.info("Starting policy pap service with arguments - {}", argumentString);
// Check the arguments
final PapCommandLineArguments arguments = new PapCommandLineArguments();
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();
} catch (final PolicyPapException e) {
LOGGER.error(START_FAILED, e);
return;
}
// Read the parameters
try {
parameterGroup = new PapParameterHandler().getParameters(arguments);
} catch (final Exception e) {
LOGGER.error(START_FAILED, e);
return;
}
// Initialize database
try {
new PapDatabaseInitializer().initializePapDatabase(parameterGroup.getDatabaseProviderParameters());
} catch (final PolicyPapException exp) {
LOGGER.error(START_FAILED + ", used parameters are {}", Arrays.toString(args), exp);
return;
}
// Now, create the activator for the policy pap service
activator = new PapActivator(parameterGroup);
Registry.register(PapConstants.REG_PAP_ACTIVATOR, activator);
// Start the activator
try {
activator.start();
} catch (final RuntimeException e) {
LOGGER.error("start of policy pap service failed, used parameters are {}", Arrays.toString(args), e);
Registry.unregister(PapConstants.REG_PAP_ACTIVATOR);
return;
}
// Add a shutdown hook to shut everything down in an orderly manner
Runtime.getRuntime().addShutdownHook(new PolicyPapShutdownHookClass());
LOGGER.info("Started policy pap service");
}
/**
* Get the parameters specified in JSON.
*
* @return the parameters
*/
public PapParameterGroup getParameters() {
return parameterGroup;
}
/**
* Shut down Execution.
*
* @throws PolicyPapException on shutdown errors
*/
public void shutdown() throws PolicyPapException {
// clear the parameterGroup variable
parameterGroup = null;
// clear the pap activator
if (activator != null) {
activator.stop();
}
}
/**
* The Class PolicyPapShutdownHookClass terminates the policy pap service when its run method is called.
*/
private class PolicyPapShutdownHookClass extends Thread {
/*
* (non-Javadoc)
*
* @see java.lang.Runnable#run()
*/
@Override
public void run() {
if (!activator.isAlive()) {
return;
}
try {
// Shutdown the policy pap service and wait for everything to stop
activator.stop();
} catch (final RuntimeException e) {
LOGGER.warn("error occured during shut down of the policy pap 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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