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ActiveMQ example source code file (TaskRunnerFactory.java)

This example ActiveMQ source code file (TaskRunnerFactory.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - ActiveMQ tags/keywords

activemq, atomiclong, dedicatedtaskrunner, executor, executorservice, string, string, task, taskrunnerfactory, taskrunnerfactory, thread, thread, threading, threadpoolexecutor, threadpoolexecutor, threads

The ActiveMQ TaskRunnerFactory.java source code

/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.apache.activemq.thread;

import java.util.concurrent.Executor;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.SynchronousQueue;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicLong;

/**
 * Manages the thread pool for long running tasks. Long running tasks are not
 * always active but when they are active, they may need a few iterations of
 * processing for them to become idle. The manager ensures that each task is
 * processes but that no one task overtakes the system. This is kinda like
 * cooperative multitasking.
 * 
 * 
 */
public class TaskRunnerFactory implements Executor {

    private ExecutorService executor;
    private int maxIterationsPerRun;
    private String name;
    private int priority;
    private boolean daemon;
    private AtomicLong id = new AtomicLong(0);

    public TaskRunnerFactory() {
        this("ActiveMQ Task", Thread.NORM_PRIORITY, true, 1000);
    }
    
    private TaskRunnerFactory(String name, int priority, boolean daemon, int maxIterationsPerRun) {
    	this(name,priority,daemon,maxIterationsPerRun,false);
    }


    public TaskRunnerFactory(String name, int priority, boolean daemon, int maxIterationsPerRun, boolean dedicatedTaskRunner) {

        this.name = name;
        this.priority = priority;
        this.daemon = daemon;
        this.maxIterationsPerRun = maxIterationsPerRun;

        // If your OS/JVM combination has a good thread model, you may want to
        // avoid
        // using a thread pool to run tasks and use a DedicatedTaskRunner
        // instead.
        if (dedicatedTaskRunner || "true".equalsIgnoreCase(System.getProperty("org.apache.activemq.UseDedicatedTaskRunner"))) {
            executor = null;
        } else {
            executor = createDefaultExecutor();
        }
    }

    public void shutdown() {
        if (executor != null) {
            executor.shutdownNow();
        }
    }

    public TaskRunner createTaskRunner(Task task, String name) {
        if (executor != null) {
            return new PooledTaskRunner(executor, task, maxIterationsPerRun);
        } else {
            return new DedicatedTaskRunner(task, name, priority, daemon);
        }
    }

    public void execute(Runnable runnable) {
        execute(runnable, "ActiveMQ Task");
    }
    
    public void execute(Runnable runnable, String name) {
        if (executor != null) {
            executor.execute(runnable);
        } else {
            new Thread(runnable, name + "-" + id.incrementAndGet()).start();
        }
    }

    protected ExecutorService createDefaultExecutor() {
        ThreadPoolExecutor rc = new ThreadPoolExecutor(0, Integer.MAX_VALUE, 10, TimeUnit.SECONDS, new SynchronousQueue<Runnable>(), new ThreadFactory() {
            public Thread newThread(Runnable runnable) {
                Thread thread = new Thread(runnable, name + "-" + id.incrementAndGet());
                thread.setDaemon(daemon);
                thread.setPriority(priority);
                return thread;
            }
        });
        // rc.allowCoreThreadTimeOut(true);
        return rc;
    }

}

Other ActiveMQ examples (source code examples)

Here is a short list of links related to this ActiveMQ TaskRunnerFactory.java source code file:

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