org.camunda.bpm.engine.impl.jobexecutor.AcquireJobsRunnable Maven / Gradle / Ivy
/*
* Copyright Camunda Services GmbH and/or licensed to Camunda Services GmbH
* under one or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information regarding copyright
* ownership. Camunda licenses this file to you under the Apache License,
* Version 2.0; 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.
*/
package org.camunda.bpm.engine.impl.jobexecutor;
import java.util.concurrent.atomic.AtomicBoolean;
import org.camunda.bpm.engine.impl.ProcessEngineLogger;
/**
* @author Thorben Lindhauer
*
*/
public abstract class AcquireJobsRunnable implements Runnable {
private final static JobExecutorLogger LOG = ProcessEngineLogger.JOB_EXECUTOR_LOGGER;
protected final JobExecutor jobExecutor;
protected volatile boolean isInterrupted = false;
protected volatile boolean isJobAdded = false;
protected final Object MONITOR = new Object();
protected final AtomicBoolean isWaiting = new AtomicBoolean(false);
public AcquireJobsRunnable(JobExecutor jobExecutor) {
this.jobExecutor = jobExecutor;
}
protected void suspendAcquisition(long millis) {
if (millis <= 0) {
return;
}
try {
LOG.debugJobAcquisitionThreadSleeping(millis);
synchronized (MONITOR) {
if(!isInterrupted) {
isWaiting.set(true);
MONITOR.wait(millis);
}
}
LOG.jobExecutorThreadWokeUp();
}
catch (InterruptedException e) {
LOG.jobExecutionWaitInterrupted();
}
finally {
isWaiting.set(false);
}
}
public void stop() {
synchronized (MONITOR) {
isInterrupted = true;
if(isWaiting.compareAndSet(true, false)) {
MONITOR.notifyAll();
}
}
}
public void jobWasAdded() {
isJobAdded = true;
if(isWaiting.compareAndSet(true, false)) {
// ensures we only notify once
// I am OK with the race condition
synchronized (MONITOR) {
MONITOR.notifyAll();
}
}
}
protected void clearJobAddedNotification() {
isJobAdded = false;
}
public boolean isJobAdded() {
return isJobAdded;
}
}