<T> Future
static  ExecutorService	newFixedThreadPool (int nThreads, ThreadFactory           Creates a thread pool that reuses a fixed set of threads operating off a shared unbounded queue, using the provided ThreadFactory to create new threads when needed.
static  ScheduledExecutorService	newScheduledThreadPool (int corePoolSize)           Creates a thread pool that can schedule commands to run after a given delay, or to execute periodically.
static  ScheduledExecutorService	newScheduledThreadPool (int corePoolSize, ThreadFactory           Creates a thread pool that can schedule commands to run after a given delay, or to execute periodically.
static  ExecutorService	newSingleThreadExecutor ()           Creates an Executor that uses a single worker thread operating off an unbounded queue.
static  ExecutorService	newSingleThreadExecutor ( ThreadFactory           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.
static  ScheduledExecutorService	newSingleThreadScheduledExecutor ()           Creates a single-threaded executor that can schedule commands to run after a given delay, or to execute periodically.
static  ScheduledExecutorService	newSingleThreadScheduledExecutor ( ThreadFactory           Creates a single-threaded executor that can schedule commands to run after a given delay, or to execute periodically.
static <T> Callable	privilegedCallable execute ( Callable Executor <T> callable)  executor, Runnable  task, T value)           Returns a Callable object that will, when called, execute the given callable under the current access control context.           Executes a Runnable task and returns a Future representing that task.
static <T> Callable T	privilegedCallableUsingCurrentClassLoader invoke ( Callable Executor <T> callable)  executor, Callable <T> task)           Returns a Callable object that will, when called, execute the given callable under the current access control context, with the current context class loader as the context class loader.           Executes a value-returning task and blocks until it returns a value or throws an exception.
static  ThreadFactory	privilegedThreadFactory ()           Returns a thread factory used to create new threads that have the same permissions as the current thread.
static void	invoke ( Executor  executor, Runnable           Executes a Runnable task and blocks until it completes normally or throws an exception.
static  ExecutorService	unconfigurableExecutorService ( ExecutorService           Returns an object that delegates all defined ExecutorService
static  ExecutorService	newCachedThreadPool ()           Creates a thread pool that creates new threads as needed, but will reuse previously constructed threads when they are available.
static  ScheduledExecutorService	unconfigurableScheduledExecutorService ( ScheduledExecutorService           Returns an object that delegates all defined ScheduledExecutorService
static  ExecutorService	newCachedThreadPool ( ThreadFactory           Creates a thread pool that creates new threads as needed, but will reuse previously constructed threads when they are available, and uses the provided ThreadFactory to create new threads when needed.
static  ExecutorService	newFixedThreadPool (int nThreads)           Creates a thread pool that reuses a fixed set of threads operating off a shared unbounded queue.
static  ExecutorService	newFixedThreadPool (int nThreads, ThreadFactory           Creates a thread pool that reuses a fixed set of threads operating off a shared unbounded queue, using the provided ThreadFactory to create new threads when needed.
static  ExecutorService	newSingleThreadExecutor ()           Creates an Executor that uses a single worker thread operating off an unbounded queue.
static  ExecutorService	newSingleThreadExecutor ( ThreadFactory           Creates an Executor that uses a single worker thread operating off an unbounded queue, and uses the provided ThreadFactory to create new threads when needed.
static  ThreadFactory	privilegedThreadFactory ()           Return a thread factory used to create new threads that have the same permissions as the current thread.

newFixedThreadPool

public static ExecutorService newFixedThreadPool(int nThreads)

Creates a thread pool that reuses a fixed set of threads operating off a shared unbounded queue. If any thread terminates due to a failure during execution prior to shutdown, a new one will take its place if needed to execute subsequent tasks.

Parameters:

nThreads - the number of threads in the pool

Returns:

the newly created thread pool

newFixedThreadPool

public static ExecutorService newFixedThreadPool(int nThreads,
                                                 ThreadFactory threadFactory)

Creates a thread pool that reuses a fixed set of threads operating off a shared unbounded queue, using the provided ThreadFactory to create new threads when needed.

Parameters:

nThreads - the number of threads in the pool

threadFactory - the factory to use when creating new threads

Returns:

the newly created thread pool

newSingleThreadExecutor

public static ExecutorService newSingleThreadExecutor()

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 This method is equivalent in effect to newFixedThreadPool(1) new FixedThreadPool(1) the returned executor is guaranteed not to be reconfigurable to use additional threads. .

Returns:

the newly created newly-created single-threaded Executor

newSingleThreadExecutor

public static ExecutorService newSingleThreadExecutor(ThreadFactory threadFactory)

Creates an Executor that uses a single worker thread operating off an unbounded queue, and uses the provided ThreadFactory to create a new thread threads when needed. Unlike the otherwise equivalent newFixedThreadPool(1, threadFactory) the returned executor is guaranteed not to be reconfigurable to use additional threads.

Parameters:

threadFactory - the factory to use when creating new threads

Returns:

the newly created newly-created single-threaded Executor

newCachedThreadPool

public static ExecutorService newCachedThreadPool()

Creates a thread pool that creates new threads as needed, but will reuse previously constructed threads when they are available. These pools will typically improve the performance of programs that execute many short-lived asynchronous tasks. Calls to execute will reuse previously constructed threads if available. If no existing thread is available, a new thread will be created and added to the pool. Threads that have not been used for sixty seconds are terminated and removed from the cache. Thus, a pool that remains idle for long enough will not consume any resources. Note that pools with similar properties but different details (for example, timeout parameters) may be created using ThreadPoolExecutor constructors.

Returns:

the newly created thread pool

newCachedThreadPool

public static ExecutorService newCachedThreadPool(ThreadFactory threadFactory)

Creates a thread pool that creates new threads as needed, but will reuse previously constructed threads when they are available, and uses the provided ThreadFactory to create new threads when needed.

Parameters:

threadFactory - the factory to use when creating new threads

Returns:

the newly created thread pool

newSingleThreadScheduledExecutor execute

public static ScheduledExecutorServiceCancellablenewSingleThreadScheduledExecutor execute () ( Executor executor,
 Runnable task) 

Creates a single-threaded executor that can schedule commands to run after a given delay, or to execute periodically. (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 newScheduledThreadPool(1) the returned executor is guaranteed not to be reconfigurable to use additional threads. Executes a Runnable task and returns a Cancellable representing that task.

Parameters:

executor - the Executor to which the task will be submitted

task - the task to submit

Returns:

the newly created scheduled executor a Cancellable representing pending completion of the task

Throws:

RejectedExecutionException - if task cannot be scheduled for execution

newSingleThreadScheduledExecutor execute

public static ScheduledExecutorService<T> Future<T> newSingleThreadScheduledExecutor execute ( ThreadFactoryExecutor threadFactory)  executor,
 Runnable task,
 T value) 

Creates a single-threaded executor that can schedule commands to run after a given delay, or to execute periodically. (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 newScheduledThreadPool(1, threadFactory) the returned executor is guaranteed not to be reconfigurable to use additional threads. Executes a Runnable task and returns a Future representing that task.

Parameters:

threadFactory - the factory to use when creating new threads executor - the Executor to which the task will be submitted

task - the task to submit

value - the value which will become the return value of the task upon task completion

Returns:

a newly created scheduled executor a Future representing pending completion of the task

Throws:

RejectedExecutionException - if task cannot be scheduled for execution

newScheduledThreadPool execute

public static ScheduledExecutorService<T> Future<T> newScheduledThreadPool execute (int corePoolSize) ( Executor executor,
 Callable<T> task) 

Creates a thread pool that can schedule commands to run after a given delay, or to execute periodically. Executes a value-returning task and returns a Future representing the pending results of the task.

Parameters:

corePoolSize - the number of threads to keep in the pool, even if they are idle. executor - the Executor to which the task will be submitted

task - the task to submit

Returns:

a newly created scheduled thread pool a Future representing pending completion of the task

Throws:

RejectedExecutionException - if task cannot be scheduled for execution

newScheduledThreadPool invoke

public static ScheduledExecutorServicevoid newScheduledThreadPool invoke (int corePoolSize,
 ThreadFactory( Executor threadFactory)  executor,
 Runnable task)
 throws ExecutionException,
 InterruptedException

Creates a thread pool that can schedule commands to run after a given delay, or to execute periodically. Executes a Runnable task and blocks until it completes normally or throws an exception.

Parameters:

corePoolSize - the number of threads to keep in the pool, even if they are idle. executor - the Executor to which the task will be submitted

threadFactory - the factory to use when the executor creates a new thread. task - the task to submit

Returns: Throws:

a newly created scheduled thread pool RejectedExecutionException - if task cannot be scheduled for execution

ExecutionException - if the task encountered an exception while executing

InterruptedException

unconfigurableExecutorService invoke

public static ExecutorService<T> T unconfigurableExecutorService invoke ( ExecutorServiceExecutor executor)  executor,
 Callable<T> task)
 throws ExecutionException,
 InterruptedException

Returns an object that delegates all defined ExecutorService methods to the given executor, but not any other methods that might otherwise be accessible using casts. This provides a way to safely "freeze" configuration and disallow tuning of a given concrete implementation. Executes a value-returning task and blocks until it returns a value or throws an exception.

Parameters:

executor - the underlying implementation executor - the Executor to which the task will be submitted

task - the task to submit

Returns:

an ExecutorService instance a Future representing pending completion of the task

Throws:

NullPointerException RejectedExecutionException - if executor null - if task cannot be scheduled for execution

InterruptedException - if interrupted while waiting for completion

ExecutionException - if the task encountered an exception while executing

unconfigurableScheduledExecutorService execute

public static ScheduledExecutorServiceFuture< Object> unconfigurableScheduledExecutorService execute ( ScheduledExecutorServiceExecutor executor)  executor,
 PrivilegedAction action) 

Returns an object that delegates all defined ScheduledExecutorService methods to the given executor, but not any other methods that might otherwise be accessible using casts. This provides a way to safely "freeze" configuration and disallow tuning of a given concrete implementation. Executes a privileged action under the current access control context and returns a Future representing the pending result object of that action.

Parameters:

executor - the underlying implementation executor - the Executor to which the task will be submitted

action - the action to submit

Returns:

a ScheduledExecutorService instance a Future representing pending completion of the action

Throws:

NullPointerException RejectedExecutionException - if executor null - if action cannot be scheduled for execution

defaultThreadFactory execute

public static ThreadFactoryFuture< Object> defaultThreadFactory execute () ( Executor executor,
 PrivilegedExceptionAction action) 

Returns a default thread factory used to create new threads. This factory creates all new threads used by an Executor in the same ThreadGroup . If there is a SecurityManager , it uses the group of System.getSecurityManager() , else the group of the thread invoking this defaultThreadFactory method. Each new thread is created as a non-daemon thread with priority Thread.NORM_PRIORITY . New threads have names accessible via Thread.getName() of pool-N-thread-M, where N is the sequence number of this factory, and M is the sequence number of the thread created by this factory. Executes a privileged exception action under the current access control context and returns a Future representing the pending result object of that action.

Parameters:

executor - the Executor to which the task will be submitted

action - the action to submit

Returns:

a thread factory a Future representing pending completion of the action

Throws:

RejectedExecutionException - if action cannot be scheduled for execution

privilegedThreadFactory defaultThreadFactory

public static ThreadFactoryprivilegedThreadFactory defaultThreadFactory ()

Returns Return a default thread factory used to create new threads that have the same permissions as the current thread. threads. This factory creates all new threads with used by an Executor in the same settings as defaultThreadFactory() ThreadGroup , additionally setting the AccessControlContext and contextClassLoader of new threads to be the same as the thread invoking this . If there is a SecurityManager , it uses the group of System.getSecurityManager() , else the group of the thread invoking this privilegedThreadFactory defaultThreadFactory method. A new Each new thread is created as a non-daemon thread with priority privilegedThreadFactory Thread.NORM_PRIORITY can be created within an AccessController.doPrivileged(java.security.PrivilegedAction ) . New threads have names accessible via Thread.getName() action setting the current thread's access control context to create threads with the selected permission settings holding within that action. of pool-N-thread-M, where N is the sequence number of this factory, and M is the sequence number of the thread created by this factory.

Note that while tasks running within such threads will have the same access control and class loader settings as the current thread, they need not have the same ThreadLocal or InheritableThreadLocal values. If necessary, particular values of thread locals can be set or reset before any task runs in ThreadPoolExecutor subclasses using ThreadPoolExecutor.beforeExecute(java.lang.Thread, java.lang.Runnable) . Also, if it is necessary to initialize worker threads to have the same InheritableThreadLocal settings as some other designated thread, you can create a custom ThreadFactory in which that thread waits for and services requests to create others that will inherit its values.

Returns:

a thread factory

Throws:

AccessControlException - if the current access control context does not have permission to both get and set context class loader. the thread factory

callable privilegedThreadFactory

public static <T> CallableThreadFactory<T> callable privilegedThreadFactory ( Runnable task,
 T result) () 

Returns a Callable Return a thread factory used to create new threads that have the same permissions as the current thread. This factory creates threads with the same settings as defaultThreadFactory() object that, when called, runs the given task and returns the given result. This can be useful when applying methods requiring a , additionally setting the AccessControlContext and contextClassLoader of new threads to be the same as the thread invoking this Callable privilegedThreadFactory to an otherwise resultless action. method. A new privilegedThreadFactory can be created within an AccessController.doPrivileged(java.security.PrivilegedAction) action setting the current thread's access control context to create threads with the selected permission settings holding within that action.

Note that while tasks running within such threads will have the same access control and class loader settings as the current thread, they need not have the same ThreadLocal or InheritableThreadLocal values. If necessary, particular values of thread locals can be set or reset before any task runs in ThreadPoolExecutor subclasses using ThreadPoolExecutor.beforeExecute(java.lang.Thread, java.lang.Runnable) . Also, if it is necessary to initialize worker threads to have the same InheritableThreadLocal settings as some other designated thread, you can create a custom ThreadFactory in which that thread waits for and services requests to create others that will inherit its values.

Parameters: Returns:

task - the task to run

result - the result to return the thread factory

Returns: Throws:

a callable object AccessControlException - if the current access control context does not have permission to both get and set context class loader.

Throws: See Also:

NullPointerException PrivilegedFutureTask - if task null

callable

 
public static Callable< Object> callable ( Runnable task) 

Returns a Callable object that, when called, runs the given task and returns null .

Parameters:

task - the task to run

Returns:

a callable object

Throws:

NullPointerException - if task null

callable

 
public static Callable< Object> callable ( PrivilegedAction action) 

Returns a Callable object that, when called, runs the given privileged action and returns its result.

Parameters:

action - the privileged action to run

Returns:

a callable object

Throws:

NullPointerException - if action null

callable

 
public static Callable< Object> callable ( PrivilegedExceptionAction action) 

Returns a Callable object that, when called, runs the given privileged exception action and returns its result.

Parameters:

action - the privileged exception action to run

Returns:

a callable object

Throws:

NullPointerException - if action null

privilegedCallable

 
public static <T> Callable<T> privilegedCallable ( Callable<T> callable) 

Returns a Callable object that will, when called, execute the given callable under the current access control context. This method should normally be invoked within an AccessController.doPrivileged(java.security.PrivilegedAction ) action to create callables that will, if possible, execute under the selected permission settings holding within that action; or if not possible, throw an associated AccessControlException .

Parameters:

callable - the underlying task

Returns:

a callable object

Throws:

NullPointerException - if callable null

privilegedCallableUsingCurrentClassLoader

 
public static <T> Callable<T> privilegedCallableUsingCurrentClassLoader ( Callable<T> callable) 

Returns a Callable object that will, when called, execute the given callable under the current access control context, with the current context class loader as the context class loader. This method should normally be invoked within an AccessController.doPrivileged(java.security.PrivilegedAction ) action to create callables that will, if possible, execute under the selected permission settings holding within that action; or if not possible, throw an associated AccessControlException .

Parameters:

callable - the underlying task

Returns:

a callable object

Throws:

NullPointerException - if callable null

AccessControlException - if the current access control context does not have permission to both set and get context class loader.