2 * ============LICENSE_START=======================================================
3 * Copyright (C) 2019 AT&T Intellectual Property. All rights reserved.
4 * ================================================================================
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
9 * http://www.apache.org/licenses/LICENSE-2.0
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
17 * SPDX-License-Identifier: Apache-2.0
18 * ============LICENSE_END=========================================================
21 package org.onap.policy.pdpx.main.comm;
23 import java.util.concurrent.Executors;
24 import java.util.concurrent.ScheduledExecutorService;
25 import java.util.concurrent.ScheduledFuture;
26 import java.util.concurrent.TimeUnit;
28 import org.onap.policy.common.endpoints.event.comm.client.TopicSinkClient;
29 import org.onap.policy.models.pdp.concepts.PdpStatus;
30 import org.onap.policy.pdpx.main.XacmlState;
31 import org.slf4j.Logger;
32 import org.slf4j.LoggerFactory;
34 public class XacmlPdpHearbeatPublisher implements Runnable {
35 public static final int DEFAULT_INTERVAL_MS = 60000;
37 private static final Logger LOGGER = LoggerFactory.getLogger(XacmlPdpHearbeatPublisher.class);
39 private final TopicSinkClient topicSinkClient;
42 * Tracks the state of this PDP.
44 private final XacmlState currentState;
47 * Current timer interval, in milliseconds.
50 private long intervalMs = DEFAULT_INTERVAL_MS;
52 private ScheduledExecutorService timerThread;
54 private ScheduledFuture<?> timer;
58 * Constructor for instantiating XacmlPdpPublisher.
60 * @param topicSinkClient used to send heart beat message
61 * @param state tracks the state of this PDP
63 public XacmlPdpHearbeatPublisher(TopicSinkClient topicSinkClient, XacmlState state) {
64 this.topicSinkClient = topicSinkClient;
65 this.currentState = state;
70 PdpStatus message = currentState.genHeartbeat();
71 LOGGER.info("Sending Xacml PDP heartbeat to the PAP - {}", message);
73 topicSinkClient.send(message);
77 * Method to terminate the heart beat.
79 public synchronized void terminate() {
80 if (timerThread != null) {
81 timerThread.shutdownNow();
88 * Restarts the timer if the interval has changed. If the timer is not currently
89 * running, then it updates the interval, but does not start the timer.
91 * @param intervalMs desired interval, or {@code null} to leave it unchanged
93 public synchronized void restart(Long intervalMs) {
94 if (intervalMs != null && intervalMs > 0 && intervalMs != this.intervalMs) {
95 this.intervalMs = intervalMs;
97 if (timerThread != null) {
99 timer = timerThread.scheduleWithFixedDelay(this, 0, this.intervalMs, TimeUnit.MILLISECONDS);
107 public synchronized void start() {
108 if (timerThread == null) {
109 timerThread = makeTimerThread();
110 timer = timerThread.scheduleWithFixedDelay(this, 0, this.intervalMs, TimeUnit.MILLISECONDS);
114 // these may be overridden by junit tests
116 protected ScheduledExecutorService makeTimerThread() {
117 return Executors.newScheduledThreadPool(1);