pl.edu.icm.jlargearrays

Class ConcurrencyUtils

java.lang.Object

pl.edu.icm.jlargearrays.ConcurrencyUtils

public class ConcurrencyUtils
extends Object

Concurrency utilities.

Author:

Piotr Wendykier (p.wendykier@icm.edu.pl)

Method Summary

Modifier and Type	Method and Description
static long	getConcurrentThreshold() Returns the minimum length of array for which multiple threads are used.
static int	getNumberOfProcessors() Returns the number of available processors.
static int	getNumberOfThreads() Returns the current number of threads.
static ExecutorService	getThreadPool() Returns the pool of threads.
static void	setConcurrentThreshold(long concurrentThreshold) Sets the minimum length of an array for which multiple threads are used.
static void	setNumberOfThreads(int n) Sets the number of threads.
static void	setThreadPool(ExecutorService threadPool) Sets the pool of threads.
static void	shutdownThreadPoolAndAwaitTermination() Shutdowns all submitted tasks.
static <T> Future<T>	submit(Callable<T> task) Submits a value-returning task for execution and returns a Future representing the pending results of the task.
static Future<?>	submit(Runnable task) Submits a Runnable task for execution and returns a Future representing that task.
static void	waitForCompletion(Future<?>[] futures) Waits for all threads to complete computation.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

getConcurrentThreshold

public static long getConcurrentThreshold()

Returns the minimum length of array for which multiple threads are used.

Returns:

the minimum length of array for which multiple threads are used

setConcurrentThreshold

public static void setConcurrentThreshold(long concurrentThreshold)

Sets the minimum length of an array for which multiple threads are used.

Parameters:

concurrentThreshold - minimum length of an array for which multiple threads are used

getNumberOfProcessors

public static int getNumberOfProcessors()

Returns the number of available processors.

Returns:

number of available processors

getNumberOfThreads

public static int getNumberOfThreads()

Returns the current number of threads.

Returns:

the current number of threads.

setNumberOfThreads

public static void setNumberOfThreads(int n)

Sets the number of threads.

Parameters:

n - new value of threads

submit

public static <T> Future<T> submit(Callable<T> task)

Submits a value-returning task for execution and returns a Future representing the pending results of the task.

Type Parameters:

T - type

Parameters:

task - task for execution

Returns:

handle to the task submitted for execution

submit

public static Future<?> submit(Runnable task)

Submits a Runnable task for execution and returns a Future representing that task.

Parameters:

task - task for execution

Returns:

handle to the task submitted for execution

waitForCompletion

public static void waitForCompletion(Future<?>[] futures)
                              throws InterruptedException,
                                     ExecutionException

Waits for all threads to complete computation.

Parameters:

futures - list of handles to the tasks

Throws:

ExecutionException - if the computation threw an exception

InterruptedException - if the current thread was interrupted while waiting

setThreadPool

public static void setThreadPool(ExecutorService threadPool)

Sets the pool of threads.

Parameters:

threadPool - pool of threads

getThreadPool

public static ExecutorService getThreadPool()

Returns the pool of threads.

Returns:

pool of threads

shutdownThreadPoolAndAwaitTermination

public static void shutdownThreadPoolAndAwaitTermination()

Shutdowns all submitted tasks.