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ActiveMQ example source code file (DeterministicTaskRunner.java)

This example ActiveMQ source code file (DeterministicTaskRunner.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

deterministictaskrunner, deterministictaskrunner, executor, interruptedexception, interruptedexception, map, runnable, runnable, task, task, taskrunner, threading, threads, util

The ActiveMQ DeterministicTaskRunner.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 org.apache.activemq.util.MDCHelper;
import org.slf4j.MDC;

import java.util.Map;
import java.util.concurrent.Executor;

/**
 * 
 */
public class DeterministicTaskRunner implements TaskRunner {

    private final Executor executor;
    private final Task task;
    private final Runnable runable;
    private boolean shutdown;    
    
    /**Constructor
     * @param executor
     * @param task
     */
    public DeterministicTaskRunner(Executor executor, Task task) {
        this.executor = executor;
        this.task = task;
        final Map context = MDCHelper.getCopyOfContextMap();
        this.runable = new Runnable() {
            public void run() {
                Thread.currentThread();
                if (context != null) {
                    MDCHelper.setContextMap(context);
                }
                runTask();
            }
        };
    }

    /**
     * We Expect MANY wakeup calls on the same TaskRunner - but each
     * needs to run
     */
    public void wakeup() throws InterruptedException {
        synchronized (runable) {

            if (shutdown) {
                return;
            }
            executor.execute(runable);

        }
    }

    /**
     * shut down the task
     * 
     * @throws InterruptedException
     */
    public void shutdown(long timeout) throws InterruptedException {
        synchronized (runable) {
            shutdown = true;
        }
    }

    public void shutdown() throws InterruptedException {
        shutdown(0);
    }

    final void runTask() {

        synchronized (runable) {
            if (shutdown) {
                runable.notifyAll();
                return;
            }
        }
        task.iterate();
    }
}

Other ActiveMQ examples (source code examples)

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

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