Examples of edu.emory.mathcs.backport.java.util.concurrent.Executor

Package edu.emory.mathcs.backport.java.util.concurrent

Examples of edu.emory.mathcs.backport.java.util.concurrent.Executor

edu.emory.mathcs.backport.java.util.concurrent.Executor
An object that executes submitted {@link Runnable} tasks. Thisinterface provides a way of decoupling task submission from the mechanics of how each task will be run, including details of thread use, scheduling, etc. An Executor is normally used instead of explicitly creating threads. For example, rather than invoking new Thread(new(RunnableTask())).start() for each of a set of tasks, you might use:
```
 Executor executor = anExecutor; executor.execute(new RunnableTask1()); executor.execute(new RunnableTask2()); ... 
```
However, the Executor interface does not strictly require that execution be asynchronous. In the simplest case, an executor can run the submitted task immediately in the caller's thread:
```
 class DirectExecutor implements Executor { public void execute(Runnable r) { r.run(); } }
```
More typically, tasks are executed in some thread other than the caller's thread. The executor below spawns a new thread for each task.
```
 class ThreadPerTaskExecutor implements Executor { public void execute(Runnable r) { new Thread(r).start(); } }
```
Many Executor implementations impose some sort of limitation on how and when tasks are scheduled. The executor below serializes the submission of tasks to a second executor, illustrating a composite executor.
```
 class SerialExecutor implements Executor { final Queue<Runnable> tasks = new ArrayDeque<Runnable>(); final Executor executor; Runnable active; SerialExecutor(Executor executor) { this.executor = executor; } public synchronized void execute(final Runnable r) { tasks.offer(new Runnable() { public void run() { try { r.run(); } finally { scheduleNext(); } } }); if (active == null) { scheduleNext(); } } protected synchronized void scheduleNext() { if ((active = tasks.poll()) != null) { executor.execute(active); } } }
```
The Executor implementations provided in this package implement {@link ExecutorService}, which is a more extensive interface. The {@link ThreadPoolExecutor} class provides anextensible thread pool implementation. The {@link Executors} classprovides convenient factory methods for these Executors. @since 1.5 @author Doug Lea

   * TaskExecutor interface, delegating to the ThreadPoolExecutor instance.
   * @see edu.emory.mathcs.backport.java.util.concurrent.Executor#execute(Runnable)
   * @see org.springframework.core.task.TaskExecutor#execute(Runnable)
   */
  public void execute(Runnable task) {
    Executor executor = getThreadPoolExecutor();
    try {
      executor.execute(task);
    }
    catch (RejectedExecutionException ex) {
      throw new TaskRejectedException("Executor [" + executor + "] did not accept task: " + task, ex);
    }
  }

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   * TaskExecutor interface, delegating to the ThreadPoolExecutor instance.
   * @see edu.emory.mathcs.backport.java.util.concurrent.Executor#execute(Runnable)
   * @see org.springframework.core.task.TaskExecutor#execute(Runnable)
   */
  public void execute(Runnable task) {
    Executor executor = getThreadPoolExecutor();
    try {
      executor.execute(task);
    }
    catch (RejectedExecutionException ex) {
      throw new TaskRejectedException("Executor [" + executor + "] did not accept task: " + task, ex);
    }
  }

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 */
public class ExecutorThreadModelFactoryBeanTest extends TestCase
{
    public void testSuccessfulCreationWithExecutor() throws Exception
    {
        Executor executor = new ThreadPoolExecutor( 1, 10, 3600, TimeUnit.SECONDS, new SynchronousQueue() );
        ExecutorThreadModelFactoryBean factory = new  ExecutorThreadModelFactoryBean();
        factory.setServiceName( "foo" );
        factory.setExecutor( executor );
        factory.afterPropertiesSet();
        ExecutorThreadModel threadModel = ( ExecutorThreadModel ) factory.getObject();

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   * TaskExecutor interface, delegating to the ThreadPoolExecutor instance.
   * @see edu.emory.mathcs.backport.java.util.concurrent.Executor#execute(Runnable)
   * @see org.springframework.core.task.TaskExecutor#execute(Runnable)
   */
  public void execute(Runnable task) {
    Executor executor = getThreadPoolExecutor();
    try {
      executor.execute(task);
    }
    catch (RejectedExecutionException ex) {
      throw new TaskRejectedException("Executor [" + executor + "] did not accept task: " + task, ex);
    }
  }

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 * @author The Apache Directory Project (mina-dev@directory.apache.org)
 * @version $Rev$, $Date$
 */
public class ExecutorThreadModelFactoryBeanTest extends TestCase {
    public void testSuccessfulCreationWithExecutor() throws Exception {
        Executor executor = new ThreadPoolExecutor(1, 10, 3600,
                TimeUnit.SECONDS, new SynchronousQueue());
        ExecutorThreadModelFactoryBean factory = new ExecutorThreadModelFactoryBean();
        factory.setServiceName("foo");
        factory.setExecutor(executor);
        factory.afterPropertiesSet();

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   * TaskExecutor interface, delegating to the ThreadPoolExecutor instance.
   * @see edu.emory.mathcs.backport.java.util.concurrent.Executor#execute(Runnable)
   * @see org.springframework.core.task.TaskExecutor#execute(Runnable)
   */
  public void execute(Runnable task) {
    Executor executor = getThreadPoolExecutor();
    try {
      executor.execute(task);
    }
    catch (RejectedExecutionException ex) {
      throw new TaskRejectedException("Executor [" + executor + "] did not accept task: " + task, ex);
    }
  }

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