2 * ============LICENSE_START=======================================================
3 * Copyright (C) 2019 Nordix Foundation.
4 * Modifications Copyright (C) 2019, 2021 AT&T Intellectual Property.
5 * Modifications Copyright (C) 2020 Bell Canada. All rights reserved.
6 * ================================================================================
7 * Licensed under the Apache License, Version 2.0 (the "License");
8 * you may not use this file except in compliance with the License.
9 * You may obtain a copy of the License at
11 * http://www.apache.org/licenses/LICENSE-2.0
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS,
15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
19 * SPDX-License-Identifier: Apache-2.0
20 * ============LICENSE_END=========================================================
23 package org.onap.policy.pap.main.startstop;
25 import java.util.Arrays;
26 import org.onap.policy.common.utils.resources.MessageConstants;
27 import org.onap.policy.common.utils.services.Registry;
28 import org.onap.policy.pap.main.PapConstants;
29 import org.onap.policy.pap.main.PolicyPapException;
30 import org.onap.policy.pap.main.PolicyPapRuntimeException;
31 import org.onap.policy.pap.main.parameters.PapParameterGroup;
32 import org.onap.policy.pap.main.parameters.PapParameterHandler;
33 import org.slf4j.Logger;
34 import org.slf4j.LoggerFactory;
37 * This class initiates ONAP Policy Framework PAP component.
39 * @author Ram Krishna Verma (ram.krishna.verma@est.tech)
43 private static final Logger LOGGER = LoggerFactory.getLogger(Main.class);
45 private PapActivator activator;
46 private PapParameterGroup parameterGroup;
49 * Instantiates the policy pap service.
51 * @param args the command line arguments
53 public Main(final String[] args) {
54 final String argumentString = Arrays.toString(args);
55 LOGGER.info("Starting policy pap service with arguments - {}", argumentString);
57 // Check the arguments
58 final PapCommandLineArguments arguments = new PapCommandLineArguments();
60 // The arguments return a string if there is a message to print and we should exit
61 final String argumentMessage = arguments.parse(args);
62 if (argumentMessage != null) {
63 LOGGER.info(argumentMessage);
66 // Validate that the arguments are sane
69 // Read the parameters
70 parameterGroup = new PapParameterHandler().getParameters(arguments);
72 // Initialize database
73 new PapDatabaseInitializer().initializePapDatabase(parameterGroup.getDatabaseProviderParameters());
75 // Now, create the activator for the policy pap service
76 activator = new PapActivator(parameterGroup);
77 Registry.register(PapConstants.REG_PAP_ACTIVATOR, activator);
79 // Start the activator
81 } catch (Exception exp) { // NOSONAR
83 * Disabled sonar on the above line, because we want to capture the stack
84 * trace via the logger while still reporting the exception message on stdout
87 LOGGER.error("failed to start Main", exp);
88 if (null != activator) {
89 Registry.unregister(PapConstants.REG_PAP_ACTIVATOR);
91 throw new PolicyPapRuntimeException(
92 String.format(MessageConstants.START_FAILURE_MSG, MessageConstants.POLICY_PAP), exp);
95 // Add a shutdown hook to shut everything down in an orderly manner
96 Runtime.getRuntime().addShutdownHook(new PolicyPapShutdownHookClass());
97 String successMsg = String.format(MessageConstants.START_SUCCESS_MSG, MessageConstants.POLICY_PAP);
98 LOGGER.info(successMsg);
102 * Get the parameters specified in JSON.
104 * @return the parameters
106 public PapParameterGroup getParameters() {
107 return parameterGroup;
111 * Shut down Execution.
113 * @throws PolicyPapException on shutdown errors
115 public void shutdown() throws PolicyPapException {
116 // clear the parameterGroup variable
117 parameterGroup = null;
119 // clear the pap activator
120 if (activator != null) {
126 * The Class PolicyPapShutdownHookClass terminates the policy pap service when its run method is called.
128 private class PolicyPapShutdownHookClass extends Thread {
132 * @see java.lang.Runnable#run()
136 if (!activator.isAlive()) {
141 // Shutdown the policy pap service and wait for everything to stop
143 } catch (final RuntimeException e) {
144 LOGGER.warn("error occured during shut down of the policy pap service", e);
152 * @param args the arguments
154 public static void main(final String[] args) { // NOSONAR
156 * NOTE: arguments are validated by the constructor, thus sonar is disabled.