Package de.xima.fc.gui.common.listener

Class TaskExecutorListener

java.lang.Object

de.xima.fc.gui.common.listener.TaskExecutorListener

All Implemented Interfaces:

EventListener, javax.servlet.ServletContextListener

public class TaskExecutorListener
extends Object
implements javax.servlet.ServletContextListener

Author:

XIMA MEDIA GmbH

Constructor Summary

Constructors

Constructor	Description
TaskExecutorListener()

Method Summary

Modifier and Type	Method	Description
void	contextDestroyed(javax.servlet.ServletContextEvent cs)
void	contextInitialized(javax.servlet.ServletContextEvent cs)
static <T> ScheduledFuture<?>	scheduleTask(Runnable runnable, long delay, TimeUnit unit)	Creates and executes a one-shot action that becomes enabled after the given delay.
static <T> ScheduledFuture<T>	scheduleTask(Callable<T> callable, long delay, TimeUnit unit)	Creates and executes a ScheduledFuture that becomes enabled after the given delay.
static Future<?>	submitTask(Runnable runnable)	Submits a Runnable task for execution and returns a Future representing that task.
static <T> Future<T>	submitTask(Callable<T> callable)	Submits a value-returning task for execution and returns a Future representing the pending results of the task.

Methods inherited from class java.lang.Object

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

Constructor Detail

TaskExecutorListener

public TaskExecutorListener()

Method Detail

contextInitialized

public void contextInitialized(javax.servlet.ServletContextEvent cs)

Specified by:

contextInitialized in interface javax.servlet.ServletContextListener

contextDestroyed

public void contextDestroyed(javax.servlet.ServletContextEvent cs)

Specified by:

contextDestroyed in interface javax.servlet.ServletContextListener

submitTask

public static Future<?> submitTask(Runnable runnable)

Submits a Runnable task for execution and returns a Future representing that task. The Future's get method will return null upon successful completion.

Parameters:

runnable - the task to submit

Returns:

a Future representing pending completion of the task

Throws:

RejectedExecutionException - if the task cannot be scheduled for execution

NullPointerException - if the task is null

scheduleTask

public static <T> ScheduledFuture<?> scheduleTask(Runnable runnable,
                                                  long delay,
                                                  TimeUnit unit)

Creates and executes a one-shot action that becomes enabled after the given delay.

Parameters:

runnable - the task to execute

delay - the time from now to delay execution

unit - the time unit of the delay parameter

Returns:

a ScheduledFuture representing pending completion of the task and whose get() method will return null upon completion

Throws:

RejectedExecutionException - if the task cannot be scheduled for execution

NullPointerException - if command is null

scheduleTask

public static <T> ScheduledFuture<T> scheduleTask(Callable<T> callable,
                                                  long delay,
                                                  TimeUnit unit)

Creates and executes a ScheduledFuture that becomes enabled after the given delay.

Type Parameters:

T - the type of the callable's result

Parameters:

callable - the function to execute

delay - the time from now to delay execution

unit - the time unit of the delay parameter

Returns:

a ScheduledFuture that can be used to extract result or cancel

Throws:

RejectedExecutionException - if the task cannot be scheduled for execution

NullPointerException - if callable is null

submitTask

public static <T> Future<T> submitTask(Callable<T> callable)

Submits a value-returning task for execution and returns a Future representing the pending results of the task. The Future's get method will return the task's result upon successful completion.

If you would like to immediately block waiting for a task, you can use constructions of the form result = exec.submit(aCallable).get();

Note: The Executors class includes a set of methods that can convert some other common closure-like objects, for example, PrivilegedAction to Callable form so they can be submitted.

Type Parameters:

T - the type of the task's result

Parameters:

callable - the task to submit

Returns:

a Future representing pending completion of the task

Throws:

RejectedExecutionException - if the task cannot be scheduled for execution

NullPointerException - if the task is null