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

        });


    }


    private Executor asyncExecutor() {
        Executor executor = exchange.getAttachment(ASYNC_EXECUTOR);
        if (executor == null) {
            executor = exchange.getDispatchExecutor();
        }
        if (executor == null) {
            executor = exchange.getConnection().getWorker();

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            if (exchange.isDispatched()) {
                if (resumed) {
                    throw new RuntimeException("resumed and dispatched");
                }
                final Runnable dispatchTask = exchange.getDispatchTask();
                Executor executor = exchange.getDispatchExecutor();
                exchange.setDispatchExecutor(null);
                exchange.unDispatch();
                if (dispatchTask != null) {
                    executor = executor == null ? exchange.getConnection().getWorker() : executor;
                    executor.execute(dispatchTask);
                }
            } else if (!resumed) {
                exchange.endExchange();
            }
        } catch (Throwable t) {

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     * @param delegate the delegate executor
     * @param taskWrapper the task wrapper
     * @return a wrapping executor
     */
    public static Executor wrappingExecutor(final Executor delegate, final DirectExecutor taskWrapper) {
        return new Executor() {
            public void execute(final Runnable command) {
                delegate.execute(executorTask(taskWrapper, command));
            }
        };
    }

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     *
     * @param factory the thread factory to use
     * @return the executor
     */
    public static Executor threadFactoryExecutor(final ThreadFactory factory) {
        return new Executor() {
            public void execute(final Runnable command) {
                factory.newThread(command).start();
            }
        };
    }

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            bound = true;


            future.setSuccess();
            fireChannelBound(channel, channel.getLocalAddress());


            Executor bossExecutor =
                ((NioServerSocketChannelFactory) channel.getFactory()).bossExecutor;
            bossExecutor.execute(new NamePreservingRunnable(
                    new Boss(channel),
                    "New I/O server boss #" + id +" (channelId: " + channel.getId() +
                    ", " + channel.getLocalAddress() + ')'));
            bossStarted = true;
        } catch (Throwable t) {

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        }
    }


    @Override
    public void start(final Runnable run) {
        Executor executor = asyncExecutor();
        final CompositeThreadSetupAction setup = servletRequestContext.getDeployment().getThreadSetupAction();
        executor.execute(new Runnable() {
            @Override
            public void run() {
                ThreadSetupAction.Handle handle = setup.setup(null);
                try {
                    run.run();

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        });


    }


    private Executor asyncExecutor() {
        Executor executor = exchange.getAttachment(ASYNC_EXECUTOR);
        if (executor == null) {
            executor = exchange.getDispatchExecutor();
        }
        if (executor == null) {
            executor = exchange.getConnection().getWorker();

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   public ConnectionEntry createConnectionEntry(final Acceptor acceptorUsed, final Connection connection)
   {
      final Configuration config = server.getConfiguration();
      
      Executor connectionExecutor = server.getExecutorFactory().getExecutor();


      final CoreRemotingConnection rc = new RemotingConnectionImpl(connection,
                                                                   interceptors,
                                                                   config.isAsyncConnectionExecutionEnabled() ? connectionExecutor
                                                                                                             : null,

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    String serviceName = "cancel_listener";
    ServiceDiscovered serviceDiscovered = discoveryServiceClient.discover(serviceName);


    // An executor that delay execute a Runnable. It's for testing race because listener cancel and discovery changes.
    Executor delayExecutor = new Executor() {
      @Override
      public void execute(final Runnable command) {
        Thread t = new Thread() {
          @Override
          public void run() {

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    return url;
  }


  @Override
  protected void startUp() throws Exception {
    Executor bossThreads = Executors.newFixedThreadPool(NUM_BOSS_THREADS,
                                                        new ThreadFactoryBuilder()
                                                          .setDaemon(true)
                                                          .setNameFormat("boss-thread")
                                                          .build());


    Executor workerThreads = Executors.newCachedThreadPool(new ThreadFactoryBuilder()
                                                             .setDaemon(true)
                                                             .setNameFormat("worker-thread#%d")
                                                             .build());


    ChannelFactory factory = new NioServerSocketChannelFactory(bossThreads, workerThreads);

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