How to use

unconfigurableExecutorService

method

in

java.util.concurrent.Executors

final ExecutorService getExitingExecutorService(
  ThreadPoolExecutor executor, long terminationTimeout, TimeUnit timeUnit) {
 useDaemonThreadFactory(executor);
 ExecutorService service = Executors.unconfigurableExecutorService(executor);
 addDelayedShutdownHook(executor, terminationTimeout, timeUnit);
 return service;
}

final ExecutorService getExitingExecutorService(
  ThreadPoolExecutor executor, long terminationTimeout, TimeUnit timeUnit) {
 useDaemonThreadFactory(executor);
 ExecutorService service = Executors.unconfigurableExecutorService(executor);
 addDelayedShutdownHook(executor, terminationTimeout, timeUnit);
 return service;
}

final ExecutorService getExitingExecutorService(
  ThreadPoolExecutor executor, long terminationTimeout, TimeUnit timeUnit) {
 useDaemonThreadFactory(executor);
 ExecutorService service = Executors.unconfigurableExecutorService(executor);
 addDelayedShutdownHook(executor, terminationTimeout, timeUnit);
 return service;
}

@Override
protected ExecutorService initializeExecutor(
    ThreadFactory threadFactory, RejectedExecutionHandler rejectedExecutionHandler) {
  BlockingQueue<Runnable> queue = createQueue(this.queueCapacity);
  ThreadPoolExecutor executor  = createExecutor(this.corePoolSize, this.maxPoolSize,
      this.keepAliveSeconds, queue, threadFactory, rejectedExecutionHandler);
  if (this.allowCoreThreadTimeOut) {
    executor.allowCoreThreadTimeOut(true);
  }
  // Wrap executor with an unconfigurable decorator.
  this.exposedExecutor = (this.exposeUnconfigurableExecutor ?
      Executors.unconfigurableExecutorService(executor) : executor);
  return executor;
}

final ExecutorService getExitingExecutorService(
  ThreadPoolExecutor executor, long terminationTimeout, TimeUnit timeUnit) {
 useDaemonThreadFactory(executor);
 ExecutorService service = Executors.unconfigurableExecutorService(executor);
 addDelayedShutdownHook(executor, terminationTimeout, timeUnit);
 return service;
}

@Override
public ExecutorService getOrderedExecutor(String poolAlias, BlockingQueue<Runnable> queue) {
 ThreadPoolExecutor executor = new ThreadPoolExecutor(1, 1, 30, TimeUnit.SECONDS, queue, ThreadFactoryUtil.threadFactory(poolAlias),  OnDemandExecutionService::rejectedExecutionHandler);
 executor.allowCoreThreadTimeOut(true);
 return unconfigurableExecutorService(executor);
}

@Override
public ExecutorService getUnorderedExecutor(String poolAlias, BlockingQueue<Runnable> queue) {
 ThreadPoolExecutor executor = new ThreadPoolExecutor(1, Runtime.getRuntime().availableProcessors(), 30, TimeUnit.SECONDS, queue, ThreadFactoryUtil.threadFactory(poolAlias), OnDemandExecutionService::rejectedExecutionHandler);
 executor.allowCoreThreadTimeOut(true);
 return unconfigurableExecutorService(executor);
}

@Override
protected ExecutorService initializeExecutor(
    ThreadFactory threadFactory, RejectedExecutionHandler rejectedExecutionHandler) {
  BlockingQueue<Runnable> queue = createQueue(this.queueCapacity);
  ThreadPoolExecutor executor  = createExecutor(this.corePoolSize, this.maxPoolSize,
      this.keepAliveSeconds, queue, threadFactory, rejectedExecutionHandler);
  if (this.allowCoreThreadTimeOut) {
    executor.allowCoreThreadTimeOut(true);
  }
  // Wrap executor with an unconfigurable decorator.
  this.exposedExecutor = (this.exposeUnconfigurableExecutor ?
      Executors.unconfigurableExecutorService(executor) : executor);
  return executor;
}

ExecutorService executorService6 = Executors.newWorkStealingPool(4);
ExecutorService executorService7 =
    Executors.unconfigurableExecutorService(executorService4);
ExecutorService executorService8 =
    Executors.unconfigurableScheduledExecutorService(executorService5);

/**
 * Creates an Executor that uses a single worker thread operating off an unbounded queue. (Note
 * however that if this single thread terminates due to a failure during execution prior to
 * shutdown, a new one will take its place if needed to execute subsequent tasks.)  Tasks are
 * guaranteed to execute sequentially, and no more than one task will be active at any given
 * time. Unlike the otherwise equivalent <tt>newFixedThreadPool(1)</tt> the returned executor is
 * guaranteed not to be reconfigurable to use additional threads.
 *
 * @return the newly created single-threaded Executor
 */
public static ExecutorService newSingleThreadExecutor() {
  return Executors.unconfigurableExecutorService(newFixedThreadPool(1));
}

/**
 * Creates an Executor that uses a single worker thread operating off an unbounded queue, and
 * uses the provided ThreadFactory to create a new thread when needed. Unlike the otherwise
 * equivalent <tt>newFixedThreadPool(1, threadFactory)</tt> the returned executor is guaranteed
 * not to be reconfigurable to use additional threads.
 *
 * @param threadFactory the factory to use when creating new threads
 * @return the newly created single-threaded Executor
 * @throws NullPointerException if threadFactory is null
 */
public static ExecutorService newSingleThreadExecutor(ThreadFactory threadFactory) {
  return Executors.unconfigurableExecutorService(newFixedThreadPool(1, threadFactory));
}

/**
 * Creates an Executor that uses a single worker thread operating off an unbounded queue. (Note
 * however that if this single thread terminates due to a failure during execution prior to
 * shutdown, a new one will take its place if needed to execute subsequent tasks.)  Tasks are
 * guaranteed to execute sequentially, and no more than one task will be active at any given
 * time. Unlike the otherwise equivalent <tt>newFixedThreadPool(1)</tt> the returned executor is
 * guaranteed not to be reconfigurable to use additional threads.
 *
 * @param isDaemon denotes if the thread should be run as a daemon or not
 * @return the newly created single-threaded Executor
 */
public static ExecutorService newSingleThreadExecutor(boolean isDaemon) {
  return Executors.unconfigurableExecutorService(newFixedThreadPool(1, newNamedThreadFactory(isDaemon)));
}

final ExecutorService getExitingExecutorService(
  ThreadPoolExecutor executor, long terminationTimeout, TimeUnit timeUnit) {
 useDaemonThreadFactory(executor);
 ExecutorService service = Executors.unconfigurableExecutorService(executor);
 addDelayedShutdownHook(service, terminationTimeout, timeUnit);
 return service;
}

final ExecutorService getExitingExecutorService(
  ThreadPoolExecutor executor, long terminationTimeout, TimeUnit timeUnit) {
 useDaemonThreadFactory(executor);
 ExecutorService service = Executors.unconfigurableExecutorService(executor);
 addDelayedShutdownHook(service, terminationTimeout, timeUnit);
 return service;
}

final ExecutorService getExitingExecutorService(
  ThreadPoolExecutor executor, long terminationTimeout, TimeUnit timeUnit) {
 useDaemonThreadFactory(executor);
 ExecutorService service = Executors.unconfigurableExecutorService(executor);
 addDelayedShutdownHook(service, terminationTimeout, timeUnit);
 return service;
}

final ExecutorService getExitingExecutorService(
  ThreadPoolExecutor executor, long terminationTimeout, TimeUnit timeUnit) {
 useDaemonThreadFactory(executor);
 ExecutorService service = Executors.unconfigurableExecutorService(executor);
 addDelayedShutdownHook(service, terminationTimeout, timeUnit);
 return service;
}

final ExecutorService getExitingExecutorService(
  ThreadPoolExecutor executor, long terminationTimeout, TimeUnit timeUnit) {
 useDaemonThreadFactory(executor);
 ExecutorService service = Executors.unconfigurableExecutorService(executor);
 addDelayedShutdownHook(service, terminationTimeout, timeUnit);
 return service;
}

final ExecutorService getExitingExecutorService(
  ThreadPoolExecutor executor, long terminationTimeout, TimeUnit timeUnit) {
 useDaemonThreadFactory(executor);
 ExecutorService service = Executors.unconfigurableExecutorService(executor);
 addDelayedShutdownHook(service, terminationTimeout, timeUnit);
 return service;
}

final ExecutorService getExitingExecutorService(
  ThreadPoolExecutor executor, long terminationTimeout, TimeUnit timeUnit) {
 useDaemonThreadFactory(executor);
 ExecutorService service = Executors.unconfigurableExecutorService(executor);
 addDelayedShutdownHook(service, terminationTimeout, timeUnit);
 return service;
}

final ExecutorService getExitingExecutorService(
  ThreadPoolExecutor executor, long terminationTimeout, TimeUnit timeUnit) {
 useDaemonThreadFactory(executor);
 ExecutorService service = Executors.unconfigurableExecutorService(executor);
 addDelayedShutdownHook(service, terminationTimeout, timeUnit);
 return service;
}