hudson.util
Class OneShotEvent

java.lang.Object
  hudson.util.OneShotEvent

public final class OneShotEvent
extends Object

Concurrency primitive.

A OneShotEvent is like a pandora's box. It starts with the closed (non-signaled) state. Multiple threads can wait for the event to become the signaled state.

Once the event becomes signaled, or the pandora's box is opened, every thread gets through freely, and there's no way to turn it back off.

Author:

Kohsuke Kawaguchi

Constructor Summary

OneShotEvent()

OneShotEvent(Object lock)

Method Summary

void	block() Blocks until the event becomes the signaled state.
void	block(long timeout) Blocks until the event becomes the signaled state.
boolean	isSignaled() Returns true if a value is offered.
void	signal() Non-blocking method that signals this event.

Methods inherited from class java.lang.Object

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

Constructor Detail

OneShotEvent

public OneShotEvent()

OneShotEvent

public OneShotEvent(Object lock)

Method Detail

signal

public void signal()

Non-blocking method that signals this event.

block

public void block()
           throws InterruptedException

Blocks until the event becomes the signaled state.

This method blocks infinitely until a value is offered.

Throws:

InterruptedException

block

public void block(long timeout)
           throws InterruptedException

Blocks until the event becomes the signaled state.

If the specified amount of time elapses, this method returns null even if the value isn't offered.

Throws:

InterruptedException

isSignaled

public boolean isSignaled()

Returns true if a value is offered.