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/*-
* ============LICENSE_START=======================================================
* Copyright (C) 2019-2021,2024 Nordix Foundation.
* Modifications Copyright (C) 2019, 2021 AT&T Intellectual Property. All rights reserved.
* Modifications Copyright (C) 2020 Bell Canada. 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.apex.services.onappf;
import java.util.Arrays;
import lombok.Getter;
import org.onap.policy.apex.service.engine.main.ApexPolicyStatisticsManager;
import org.onap.policy.apex.services.onappf.exception.ApexStarterException;
import org.onap.policy.apex.services.onappf.exception.ApexStarterRunTimeException;
import org.onap.policy.apex.services.onappf.parameters.ApexStarterParameterGroup;
import org.onap.policy.apex.services.onappf.parameters.ApexStarterParameterHandler;
import org.onap.policy.common.utils.cmd.CommandLineException;
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 Apex as a service based on instructions from PAP.
*
* @author Ajith Sreekumar (ajith.sreekumar@est.tech)
*/
public class ApexStarterMain {
private static final Logger LOGGER = LoggerFactory.getLogger(ApexStarterMain.class);
private ApexStarterActivator activator;
@Getter
private ApexStarterParameterGroup parameters;
/**
* Instantiates the ApexStarter.
*
* @param args the command line arguments
*/
public ApexStarterMain(final String[] args) {
final var params = Arrays.toString(args);
LOGGER.info("In ApexStarter with parameters {}", params);
// Check the arguments
final var arguments = new ApexStarterCommandLineArguments();
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();
// Read the parameters
parameters = new ApexStarterParameterHandler().getParameters(arguments);
// create the activator
activator = new ApexStarterActivator(parameters);
Registry.register(ApexStarterConstants.REG_APEX_STARTER_ACTIVATOR, activator);
Registry.register(ApexPolicyStatisticsManager.REG_APEX_PDP_POLICY_COUNTER,
new ApexPolicyStatisticsManager());
// Start the activator
activator.initialize();
} catch (final ApexStarterException | CommandLineException e) {
if (null != activator) {
Registry.unregister(ApexStarterConstants.REG_APEX_STARTER_ACTIVATOR);
}
throw new ApexStarterRunTimeException(
String.format(MessageConstants.START_FAILURE_MSG, MessageConstants.POLICY_APEX_PDP), e);
}
// Add a shutdown hook to shut everything down in an orderly manner
Runtime.getRuntime().addShutdownHook(new ApexStarterShutdownHookClass());
var successMsg = String.format(MessageConstants.START_SUCCESS_MSG, MessageConstants.POLICY_APEX_PDP);
LOGGER.info(successMsg);
}
/**
* Shut down Execution.
*
* @throws ApexStarterException on shutdown errors
*/
public void shutdown() throws ApexStarterException {
// clear the parameterGroup variable
parameters = null;
// clear the apex starter activator
if (activator != null && activator.isAlive()) {
activator.terminate();
}
Registry.unregister(ApexPolicyStatisticsManager.REG_APEX_PDP_POLICY_COUNTER);
}
/**
* The Class ApexStarterShutdownHookClass terminates the Apex starter for the Apex service when its run method is
* called.
*/
private class ApexStarterShutdownHookClass extends Thread {
/**
* {@inheritDoc}.
*/
@Override
public void run() {
try {
// Shutdown the apex starter service and wait for everything to stop
if (activator != null && activator.isAlive()) {
activator.terminate();
}
} catch (final ApexStarterException e) {
LOGGER.warn("error occurred during shut down of the apex starter service", e);
}
}
}
/**
* The main method.
*
* @param args the arguments
*
*/
public static void main(final String[] args) {
new ApexStarterMain(args);
}
}
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