Package java.util.concurrent

Classes
class	CopyOnWriteArrayList< E >
class	AbstractExecutorService
	Provides default implementation of ExecutorService execution methods. More...
class	ArrayBlockingQueue< E >
	A bounded BlockingQueue blocking queue} backed by an array. More...
interface	BlockingQueue< E >
	A java.util.Queue that additionally supports operations that wait for the queue to become non-empty when retrieving an element, and wait for space to become available in the queue when storing an element. More...
class	BrokenBarrierException
	Exception thrown when a thread tries to wait upon a barrier that is in a broken state, or which enters the broken state while the thread is waiting. More...
interface	Callable< V >
	A task that returns a result and may throw an exception. More...
class	CancellationException
	Exception indicating that the result of a value-producing task, such as a FutureTask, cannot be retrieved because the task was cancelled. More...
interface	CompletionService< V >
	A service that decouples the production of new asynchronous tasks from the consumption of the results of completed tasks. More...
class	ConcurrentHashMap< K, V >
	A hash table supporting full concurrency of retrievals and adjustable expected concurrency for updates. More...
class	ConcurrentLinkedQueue< E >
	An unbounded thread-safe Queue queue} based on linked nodes. More...
interface	ConcurrentMap< K, V >
	A java.util.Map providing additional atomic putIfAbsent, remove, and replace methods. More...
class	CopyOnWriteArraySet< E >
	A java.util.Set that uses java.util.concurrent.CopyOnWriteArrayList for all of its operations. More...
class	CountDownLatch
	A synchronization aid that allows one or more threads to wait until a set of operations being performed in other threads completes. More...
class	CyclicBarrier
	A synchronization aid that allows a set of threads to all wait for each other to reach a common barrier point. More...
class	DelayQueue< E extends Delayed >
	An unbounded BlockingQueue blocking queue} of Delayed elements, in which an element can only be taken when its delay has expired. More...
interface	Delayed
	A mix-in style interface for marking objects that should be acted upon after a given delay. More...
class	Exchanger< V >
	A synchronization point at which two threads can exchange objects. More...
class	ExecutionException
	Exception thrown when attempting to retrieve the result of a task that aborted by throwing an exception. More...
interface	Executor
	An object that executes submitted Runnable tasks. More...
class	ExecutorCompletionService< V >
	A CompletionService that uses a supplied Executor to execute tasks. More...
interface	ExecutorService
	An Executor that provides methods to manage termination and methods that can produce a Future for tracking progress of one or more asynchronous tasks. More...
class	Executors
	Factory and utility methods for Executor, ExecutorService, ScheduledExecutorService, ThreadFactory, and Callable classes defined in this package. More...
interface	Future< V >
	A Future represents the result of an asynchronous computation. More...
class	FutureTask< V >
	A cancellable asynchronous computation. More...
class	LinkedBlockingQueue< E >
	An optionally-bounded BlockingQueue blocking queue} based on linked nodes. More...
class	PriorityBlockingQueue< E >
	An unbounded BlockingQueue blocking queue} that uses the same ordering rules as class PriorityQueue and supplies blocking retrieval operations. More...
class	RejectedExecutionException
	Exception thrown by an Executor when a task cannot be accepted for execution. More...
interface	RejectedExecutionHandler
	A handler for tasks that cannot be executed by a ThreadPoolExecutor. More...
interface	ScheduledExecutorService
	An ExecutorService that can schedule commands to run after a given delay, or to execute periodically. More...
interface	ScheduledFuture< V >
	A delayed result-bearing action that can be cancelled. More...
class	ScheduledThreadPoolExecutor
	A ThreadPoolExecutor that can additionally schedule commands to run after a given delay, or to execute periodically. More...
class	Semaphore
	A counting semaphore. More...
class	SynchronousQueue< E >
	A BlockingQueue blocking queue} in which each put must wait for a take, and vice versa. More...
interface	ThreadFactory
	An object that creates new threads on demand. More...
class	ThreadPoolExecutor
	An ExecutorService that executes each submitted task using one of possibly several pooled threads, normally configured using Executors factory methods. More...
class	TimeoutException
	Exception thrown when a blocking operation times out. More...
Packages
package	atomic
package	locks
Enumerations
enum	TimeUnit { NANOSECONDS = (0), MICROSECONDS = (1), MILLISECONDS = (2), SECONDS = (3) }
	A TimeUnit represents time durations at a given unit of granularity and provides utility methods to convert across units, and to perform timing and delay operations in these units. More...

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Enumeration Type Documentation

enum TimeUnit

A TimeUnit represents time durations at a given unit of granularity and provides utility methods to convert across units, and to perform timing and delay operations in these units.

A TimeUnit does not maintain time information, but only helps organize and use time representations that may be maintained separately across various contexts.

A TimeUnit is mainly used to inform time-based methods how a given timing parameter should be interpreted. For example, the following code will timeout in 50 milliseconds if the lock is not available:

  Lock lock = ...;
  if ( lock.tryLock(50L, TimeUnit.MILLISECONDS) ) ...
 

while this code will timeout in 50 seconds:

  Lock lock = ...;
  if ( lock.tryLock(50L, TimeUnit.SECONDS) ) ...
 

Note however, that there is no guarantee that a particular timeout implementation will be able to notice the passage of time at the same granularity as the given TimeUnit.

Since:

1.5

Author:

Doug Lea

Enumerator:

NANOSECONDS
MICROSECONDS
MILLISECONDS
SECONDS