Package velox.api.layer1.common.helper

Class ExecutorsHelper

java.lang.Object

velox.api.layer1.common.helper.ExecutorsHelper

public class ExecutorsHelper
extends Object

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	ExecutorsHelper.PrioritizedRunnable	Runnable with an integer priority.

Constructor Summary

Constructors

Constructor	Description
ExecutorsHelper()

Method Summary

Modifier and Type	Method	Description
static boolean	executeIfNotShutdown(ExecutorService executor, Runnable command)	Executes the given command the same as Executor.execute(Runnable), but only if the executor is not shutdown and returns true.
static <T> List<Future<T>>	invokeAllIfNotShutdown(ExecutorService executor, Collection<? extends Callable<T>> tasks)	Executes given tasks the same as ExecutorService.invokeAll(Collection), but only if the executor is not shutdown and returns a list of Futures representing pending completion of the tasks.
static ThreadPoolExecutor	newFixedThreadPoolExecutor(int poolSize, String name)
static velox.api.layer1.common.helper.PriorityThreadPoolExecutor	newOnDemandPriorityThreadPoolExecutor(String name)
static ThreadPoolExecutor	newOnDemandSingleThreadExecutor(String name)	Similar to Executors.newSingleThreadExecutor(), but limits threads lifetime and sets a name
static ThreadPoolExecutor	newOnDemandSingleThreadPriorityExecutor(String name)	Respects priority of runnables if those are instances of ExecutorsHelper.PrioritizedRunnable, limits threads lifetime, sets a name.
static ScheduledExecutorService	newScheduledThreadPool(int corePoolSize, String name)
static ThreadPoolExecutor	newSingleThreadExecutor(String name)	Similar to Executors.newSingleThreadExecutor(), but sets a name and isn't wrapped in FinalizableDelegatedExecutorService
static ThreadPoolExecutor	newSingleThreadExecutor(String name, Consumer<Boolean> queueEmptyCallback)	Similar to Executors.newSingleThreadExecutor(), but sets a name and isn't wrapped in FinalizableDelegatedExecutorService
static ThreadPoolExecutor	newThreadPoolExecutor(int corePoolSize, int maximumPoolSize, String name)
static ThreadPoolExecutor	newThreadPoolExecutor(int corePoolSize, int maximumPoolSize, String name, BlockingQueue<Runnable> queue)
static ThreadPoolExecutor	newThreadPoolExecutor(int corePoolSize, int maximumPoolSize, String name, BlockingQueue<Runnable> queue, RejectedExecutionHandler handler)
static ThreadPoolExecutor	newThreadPoolExecutor(int corePoolSize, int maximumPoolSize, String name, Consumer<Boolean> queueEmptyCallback)
static ThreadPoolExecutor	newThreadPoolPriorityExecutor(int corePoolSize, int maximumPoolSize, String name)
static ScheduledFuture<?>	scheduleIfNotShutDown(ScheduledExecutorService executor, Runnable command, long delay, TimeUnit unit)	Schedules the given command for execution after the specified delay, but only if the executor is not shut down.

Methods inherited from class java.lang.Object

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

Constructor Details

ExecutorsHelper

public ExecutorsHelper()

Method Details

newOnDemandSingleThreadExecutor

public static ThreadPoolExecutor newOnDemandSingleThreadExecutor(String name)

Similar to Executors.newSingleThreadExecutor(), but limits threads lifetime and sets a name

newOnDemandSingleThreadPriorityExecutor

public static ThreadPoolExecutor newOnDemandSingleThreadPriorityExecutor(String name)

Respects priority of runnables if those are instances of ExecutorsHelper.PrioritizedRunnable, limits threads lifetime, sets a name. Otherwise similar to Executors.newSingleThreadExecutor()

newSingleThreadExecutor

public static ThreadPoolExecutor newSingleThreadExecutor(String name)

Similar to Executors.newSingleThreadExecutor(), but sets a name and isn't wrapped in FinalizableDelegatedExecutorService

newSingleThreadExecutor

public static ThreadPoolExecutor newSingleThreadExecutor(String name,
 Consumer<Boolean> queueEmptyCallback)

Similar to Executors.newSingleThreadExecutor(), but sets a name and isn't wrapped in FinalizableDelegatedExecutorService

newThreadPoolExecutor

public static ThreadPoolExecutor newThreadPoolExecutor(int corePoolSize,
 int maximumPoolSize,
 String name,
 Consumer<Boolean> queueEmptyCallback)

newThreadPoolExecutor

public static ThreadPoolExecutor newThreadPoolExecutor(int corePoolSize,
 int maximumPoolSize,
 String name)

newFixedThreadPoolExecutor

public static ThreadPoolExecutor newFixedThreadPoolExecutor(int poolSize,
 String name)

newThreadPoolPriorityExecutor

public static ThreadPoolExecutor newThreadPoolPriorityExecutor(int corePoolSize,
 int maximumPoolSize,
 String name)

newThreadPoolExecutor

public static ThreadPoolExecutor newThreadPoolExecutor(int corePoolSize,
 int maximumPoolSize,
 String name,
 BlockingQueue<Runnable> queue)

newThreadPoolExecutor

public static ThreadPoolExecutor newThreadPoolExecutor(int corePoolSize,
 int maximumPoolSize,
 String name,
 BlockingQueue<Runnable> queue,
 RejectedExecutionHandler handler)

newScheduledThreadPool

public static ScheduledExecutorService newScheduledThreadPool(int corePoolSize,
 String name)

newOnDemandPriorityThreadPoolExecutor

public static velox.api.layer1.common.helper.PriorityThreadPoolExecutor newOnDemandPriorityThreadPoolExecutor(String name)

executeIfNotShutdown

public static boolean executeIfNotShutdown(ExecutorService executor,
 Runnable command)

Executes the given command the same as Executor.execute(Runnable), but only if the executor is not shutdown and returns true. Otherwise, the command is not executed and the method returns false.

Parameters:

executor - executor to be used to run the task

command - the runnable task

Returns:

true if the command was executed, false if the executor is shutdown

scheduleIfNotShutDown

public static ScheduledFuture<?> scheduleIfNotShutDown(ScheduledExecutorService executor,
 Runnable command,
 long delay,
 TimeUnit unit)

Schedules the given command for execution after the specified delay, but only if the executor is not shut down. If the executor is still active, the command is scheduled and a ScheduledFuture<?> representing pending completion of the task is returned. If the executor is shut down, the command is not scheduled, and the method returns null.

Parameters:

executor - The ScheduledExecutorService to be used to schedule the task.

command - The Runnable task to be scheduled.

delay - The delay after which the command is to be executed.

unit - The TimeUnit of the delay parameter.

Returns:

A ScheduledFuture<?> representing pending completion of the task, or null if the executor is shut down and the task could not be scheduled.

invokeAllIfNotShutdown

public static <T> List<Future<T>> invokeAllIfNotShutdown(ExecutorService executor,
 Collection<? extends Callable<T>> tasks)

Executes given tasks the same as ExecutorService.invokeAll(Collection), but only if the executor is not shutdown and returns a list of Futures representing pending completion of the tasks. Otherwise, the command is not executed and the method returns empty list.

Type Parameters:

T - type of the result

Parameters:

executor - executor to be used to run tasks

tasks - callable task to be executed

Returns:

a list of Futures representing pending completion of the tasks, or empty list if the executor is shutdown