org.activiti.engine.impl.asyncexecutor.ManagedAsyncJobExecutor Maven / Gradle / Ivy
/* 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.
*/
package org.activiti.engine.impl.asyncexecutor;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.enterprise.concurrent.ManagedThreadFactory;
import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
/**
* Simple JSR-236 async job executor to allocate threads through {@link ManagedThreadFactory}. Falls back to {@link AsyncExecutor} when a thread factory was not referenced in configuration.
*
* In Java EE 7, all application servers should provide access to a {@link ManagedThreadFactory}.
*
*/
public class ManagedAsyncJobExecutor extends DefaultAsyncJobExecutor {
private static Logger log = LoggerFactory.getLogger(ManagedAsyncJobExecutor.class);
protected ManagedThreadFactory threadFactory;
public ManagedThreadFactory getThreadFactory() {
return threadFactory;
}
public void setThreadFactory(ManagedThreadFactory threadFactory) {
this.threadFactory = threadFactory;
}
protected void initAsyncJobExecutionThreadPool() {
if (threadFactory == null) {
log.warn("A managed thread factory was not found, falling back to self-managed threads");
super.initAsyncJobExecutionThreadPool();
} else {
if (threadPoolQueue == null) {
log.info("Creating thread pool queue of size {}", queueSize);
threadPoolQueue = new ArrayBlockingQueue(queueSize);
}
if (executorService == null) {
log.info("Creating executor service with corePoolSize {}, maxPoolSize {} and keepAliveTime {}", corePoolSize, maxPoolSize, keepAliveTime);
ThreadPoolExecutor threadPoolExecutor = new ThreadPoolExecutor(corePoolSize, maxPoolSize, keepAliveTime, TimeUnit.MILLISECONDS, threadPoolQueue, threadFactory);
threadPoolExecutor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
executorService = threadPoolExecutor;
}
startJobAcquisitionThread();
}
}
}