Examples of java.util.concurrent.Executor

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 {@code Executor} is normally usedinstead of explicitly creating threads. For example, rather than invoking {@code new Thread(new(RunnableTask())).start()} for eachof a set of tasks, you might use:
```
 Executor executor = anExecutor; executor.execute(new RunnableTask1()); executor.execute(new RunnableTask2()); ... 
```
However, the {@code Executor} interface does not strictlyrequire that execution be asynchronous. In the simplest case, an executor can run the submitted task immediately in the caller's thread:
```
  {@code}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.
```
  {@code}class ThreadPerTaskExecutor implements Executor  public void execute(Runnable r) { new Thread(r).start(); } }}
```
Many {@code Executor} implementations impose some sort oflimitation on how and when tasks are scheduled. The executor below serializes the submission of tasks to a second executor, illustrating a composite executor.
```
  {@code}class SerialExecutor implements Executor  final Queue tasks = new ArrayDeque(); 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 {@code Executor} implementations provided in this packageimplement {@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.
Memory consistency effects: Actions in a thread prior to submitting a {@code Runnable} object to an {@code Executor}happen-before its execution begins, perhaps in another thread. @since 1.5 @author Doug Lea

                if(loopback) {
                    if(log.isTraceEnabled()) log.trace(new StringBuilder("looping back message ").append(msg));
                    if(msg.getSrc() == null)
                        msg.setSrc(local_addr);


                    Executor pool=msg.isFlagSet(Message.OOB)? oob_pool : default_pool;
                    pool.execute(new Runnable() {
                        public void run() {
                            up_prot.up(evt);
                        }
                    });
                }

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    FakeDataManager fdm = new FakeDataManager();
      TestProcessor.sampleData1(fdm);
      BufferManager bm = BufferManagerFactory.getStandaloneBufferManager();
      SessionAwareCache<CachedResults> cache = new SessionAwareCache<CachedResults>();
      cache.setBufferManager(bm);
      Executor executor = new Executor() {
      @Override
      public void execute(Runnable command) {
        command.run();
      }
      };

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    hdm.addData("SELECT mattable.info.e2, mattable.info.e1 FROM mattable.info", new List[] {Arrays.asList(1, "a"), Arrays.asList(2, "a")});
    
      BufferManager bm = BufferManagerFactory.getStandaloneBufferManager();
      SessionAwareCache<CachedResults> cache = new SessionAwareCache<CachedResults>();
      cache.setBufferManager(bm);
      Executor executor = new Executor() {
      @Override
      public void execute(Runnable command) {
        command.run();
      }
      };

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          context.setGlobalTableStore(new TempTableStore("SYSTEM"));
        }
        if (!(dataManager instanceof TempTableDataManager)) {
          SessionAwareCache<CachedResults> cache = new SessionAwareCache<CachedResults>();
          cache.setBufferManager(bufferMgr);
          Executor executor = new Executor() {
          @Override
          public void execute(Runnable command) {
            command.run();
          }
          };

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                                "Null message received from message consumer.",
                                " Exiting ListenerThread::run().");
                        return;
                    }
                    while (message != null) {
                        Executor executor = theTransport.callback.getExecutor();
                        if (executor == null) {
                            executor = theTransport.bus
                                .getWorkQueueManager().getAutomaticWorkQueue();
                        }
                        if (executor != null) {
                            try {
                                executor.execute(new JMSExecutor(theTransport, message));
                                message = null;
                            } catch (RejectedExecutionException ree) {
                                //FIXME - no room left on workqueue, what to do
                                //for now, loop until it WILL fit on the queue, 
                                //although we could just dispatch on this thread.

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        doTestInvokeAsync(useAutomaticWorkQueue, false);
    }


    public void doTestInvokeAsync(final boolean useAutomaticWorkQueue, boolean decoupled) throws Exception {


        Executor executor =  null;
        if (useAutomaticWorkQueue) {
            queueManager = new WorkQueueManagerImpl(bus);
            executor = queueManager.getAutomaticWorkQueue();
        } else {
            executorService = Executors.newFixedThreadPool(1);

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        ServerBinding sb = ei.getServerBinding();
        EndpointReferenceType ref = ei.getEndpointReferenceType();
        EndpointReferenceUtils.setAddress(ref, "test://localhost:7777/test");
        sb.activate();
        TestServerBinding tsb = (TestServerBinding)sb;
        ei.setExecutor(new Executor() {
            public void execute(Runnable command) {
                command.run();            
            }
        });

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        outputContext.getOutputStream().flush();
        outputContext.getOutputStream().close();
    }  


    private void executeAsync(Runnable command) {
        Executor executor = 
            sbeCallback.getExecutor() != null
            ? sbeCallback.getExecutor() 
            : getBus().getWorkQueueManager().getAutomaticWorkQueue(); 
        try {
            executor.execute(command);
        } catch (RejectedExecutionException ree) {
            LOG.log(Level.WARNING, "ONEWAY_FALLBACK_TO_DIRECT_MSG", ree);
            command.run();
        }
    }

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   * @param state {@link Service.State#STARTING} or
   *     {@link Service.State#STOPPING}, used by the default implementation for
   *     naming the thread
   */
  protected Executor executor(final State state) {
    return new Executor() {
      @Override
      public void execute(Runnable command) {
        new Thread(command, getServiceName() + " " + state).start();
      }
    };

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   * priority. The returned executor's {@link Executor#execute(Runnable)
   * execute()} method is called when this service is started, and should return
   * promptly.
   */
  protected Executor executor() {
    return new Executor() {
      @Override
      public void execute(Runnable command) {
        new Thread(command, getServiceName()).start();
      }
    };

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