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/*-
* ============LICENSE_START=======================================================
* 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.pdpx.main.comm;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.ScheduledFuture;
import java.util.concurrent.TimeUnit;
import lombok.Getter;
import org.onap.policy.common.endpoints.event.comm.client.BidirectionalTopicClient;
import org.onap.policy.common.utils.coder.Coder;
import org.onap.policy.common.utils.coder.CoderException;
import org.onap.policy.common.utils.coder.StandardCoder;
import org.onap.policy.models.pdp.concepts.PdpStatus;
import org.onap.policy.models.pdp.concepts.PdpTopicCheck;
import org.onap.policy.pdpx.main.XacmlState;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class XacmlPdpHearbeatPublisher implements Runnable {
public static final int DEFAULT_HB_INTERVAL_MS = 60000;
private static final Logger LOGGER = LoggerFactory.getLogger(XacmlPdpHearbeatPublisher.class);
private static final Coder CODER = new StandardCoder();
private final BidirectionalTopicClient topicChecker;
private final long probeHeartbeatTopicMs;
/**
* Tracks the state of this PDP.
*/
private final XacmlState currentState;
/**
* Current timer interval, in milliseconds.
*/
@Getter
private long intervalMs = DEFAULT_HB_INTERVAL_MS;
private ScheduledExecutorService timerThread;
private ScheduledFuture<?> timer;
/**
* Constructor for instantiating XacmlPdpPublisher.
*
* @param topicChecker used to check the topic before sending heart beat message
* @param probeHeartbeatTopicMs frequency, in milliseconds, with which to probe the
* heartbeat topic before sending the first heartbeat. Zero disables probing
* @param state tracks the state of this PDP
*/
public XacmlPdpHearbeatPublisher(BidirectionalTopicClient topicChecker, long probeHeartbeatTopicMs,
XacmlState state) {
LOGGER.info("heartbeat topic probe {}ms", probeHeartbeatTopicMs);
this.topicChecker = topicChecker;
this.probeHeartbeatTopicMs = probeHeartbeatTopicMs;
this.currentState = state;
}
@Override
public void run() {
try {
if (!isTopicReady()) {
return;
}
PdpStatus message = currentState.genHeartbeat();
LOGGER.info("Sending Xacml PDP heartbeat to the PAP - {}", message);
String json = CODER.encode(message);
topicChecker.send(json);
} catch (RuntimeException | CoderException e) {
LOGGER.warn("send to {} failed because of {}", topicChecker.getSink().getTopic(), e.getMessage(), e);
}
}
private boolean isTopicReady() throws CoderException {
if (probeHeartbeatTopicMs <= 0 || topicChecker.isReady()) {
return true;
}
var check = new PdpTopicCheck();
check.setName(XacmlState.PDP_NAME);
return topicChecker.awaitReady(check, probeHeartbeatTopicMs);
}
/**
* Method to terminate the heart beat.
*/
public synchronized void terminate() {
topicChecker.stopWaiting();
if (timerThread != null) {
timerThread.shutdownNow();
timerThread = null;
timer = null;
}
}
/**
* Restarts the timer if the interval has changed. If the timer is not currently
* running, then it updates the interval, but does not start the timer.
*
* @param intervalMs desired interval, or {@code null} to leave it unchanged
*/
public synchronized void restart(Long intervalMs) {
if (intervalMs != null && intervalMs > 0 && intervalMs != this.intervalMs) {
this.intervalMs = intervalMs;
if (timerThread != null) {
timer.cancel(false);
timer = timerThread.scheduleWithFixedDelay(this, 0, this.intervalMs, TimeUnit.MILLISECONDS);
}
}
}
/**
* Starts the timer.
*/
public synchronized void start() {
if (timerThread == null) {
timerThread = makeTimerThread();
timer = timerThread.scheduleWithFixedDelay(this, 0, this.intervalMs, TimeUnit.MILLISECONDS);
}
}
// these may be overridden by junit tests
protected ScheduledExecutorService makeTimerThread() {
return Executors.newScheduledThreadPool(1);
}
}
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