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

                            outMessage.setContent(Exception.class, e);
                            outMessage.getInterceptorChain().getFaultObserver().onMessage(outMessage);
                        }
                    }
                };
                Executor ex = outMessage.getExchange().get(Executor.class);
                if (ex == null) {
                    WorkQueueManager mgr = outMessage.getExchange().get(Bus.class)
                        .getExtension(WorkQueueManager.class);
                    ex = mgr.getNamedWorkQueue("http-conduit");
                    if (ex == null) {
                        ex = mgr.getAutomaticWorkQueue();
                    }
                } else {
                    outMessage.getExchange().put(Executor.class.getName() 
                                                 + ".USING_SPECIFIED", Boolean.TRUE);
                }
                ex.execute(runnable);
            }
        }

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         */
        protected void initiate(boolean requestAcknowledge) {
            includeAckRequested = requestAcknowledge;
            pending = true;
            Endpoint ep = message.getExchange().get(Endpoint.class);
            Executor executor = ep.getExecutor();
            if (null == executor) {
                executor = ep.getService().getExecutor();
                LOG.log(Level.FINE, "Using service executor {0}", executor.getClass().getName());
            } else {
                LOG.log(Level.FINE, "Using endpoint executor {0}", executor.getClass().getName());
            }
            
            try {
                executor.execute(this);
            } catch (RejectedExecutionException ex) {
                LOG.log(Level.SEVERE, "RESEND_INITIATION_FAILED_MSG", ex);
            }
        }

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   */
  private void cacheBlock(String bpid, long blockId) {
    FsVolumeImpl volume;
    String blockFileName;
    long length, genstamp;
    Executor volumeExecutor;


    synchronized (this) {
      ReplicaInfo info = volumeMap.get(bpid, blockId);
      boolean success = false;
      try {

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        if (service instanceof ResourceAdapter) {
            ResourceAdapter resourceAdapter = (ResourceAdapter) service;


            // Create a thead pool for work manager
            int threadPoolSize = getIntProperty(serviceInfo.properties, "threadPoolSize", 30);
            Executor threadPool;
            if (threadPoolSize <= 0) {
                threadPool = Executors.newCachedThreadPool(new ResourceAdapterThreadFactory(serviceInfo.id));
            } else {
                threadPool = Executors.newFixedThreadPool(threadPoolSize, new ResourceAdapterThreadFactory(serviceInfo.id));
            }

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            if (sc == null) {
                sc = new SocketProcessor(socketWrapper, status);
            } else {
                sc.reset(socketWrapper, status);
            }
            Executor executor = getExecutor();
            if (dispatch && executor != null) {
                executor.execute(sc);
            } else {
                sc.run();
            }
        } catch (RejectedExecutionException ree) {
            log.debug(sm.getString("endpoint.executor.fail", socketWrapper), ree);

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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 = servletRequestContext.getDeployment().getAsyncExecutor();
        if (executor == null) {
            executor = servletRequestContext.getDeployment().getExecutor();
        }
        if (executor == null) {
            executor = exchange.getConnection().getWorker();

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        exchange.putAttachment(ServletRequestContext.ATTACHMENT_KEY, servletRequestContext);


        exchange.startBlocking(new ServletBlockingHttpExchange(exchange));
        servletRequestContext.setServletPathMatch(info);


        Executor executor = info.getServletChain().getExecutor();
        if (executor == null) {
            executor = servletContext.getDeployment().getExecutor();
        }


        if (exchange.isInIoThread() || executor != null) {

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        if (service instanceof ResourceAdapter) {
            ResourceAdapter resourceAdapter = (ResourceAdapter) service;


            // Create a thead pool for work manager
            int threadPoolSize = getIntProperty(serviceInfo.properties, "threadPoolSize", 30);
            Executor threadPool;
            if (threadPoolSize <= 0) {
                threadPool = Executors.newCachedThreadPool(new ResourceAdapterThreadFactory(serviceInfo.id));
            } else {
                threadPool = Executors.newFixedThreadPool(threadPoolSize, new ResourceAdapterThreadFactory(serviceInfo.id));
            }

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            public int getCount() {
                return count;
            }
        }
        Executor executor = new TestExecutor();
        service.setExecutor(executor);
        assertNotNull(service);
        assertSame(executor, service.getExecutor());

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