nl.knowledgeplaza.util.thread
Class Semaphore

java.lang.Object
  nl.knowledgeplaza.util.thread.Semaphore

public class Semaphore
extends java.lang.Object

A simple semaphore for multithreading issues.

Version:

$Revision: 1.2 $

Field Summary

static java.lang.String

SOURCECODE_VERSION Standard variable for determining version of a class file.

Constructor Summary

Semaphore(int n)

Semaphore(int n, boolean exitOnStopFlag)

Method Summary

void	acquire()
boolean	aquireNonBlocking()
java.lang.String	getName()
int	getValue() Get the current value, mostly for debugging purposes.
void	release()
void	setName(java.lang.String Name) name of the semaphore (default is hashCode)

Methods inherited from class java.lang.Object

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

Field Detail

SOURCECODE_VERSION

public static final java.lang.String SOURCECODE_VERSION

Standard variable for determining version of a class file.

See Also:

Constant Field Values

Constructor Detail

Semaphore

public Semaphore(int n)

Parameters:

n -

Semaphore

public Semaphore(int n,
                 boolean exitOnStopFlag)

Parameters:

n -

exitOnStopFlag - see ThreadUtils

Method Detail

setName

public void setName(java.lang.String Name)

name of the semaphore (default is hashCode)

getName

public java.lang.String getName()

acquire

public void acquire()

aquireNonBlocking

public boolean aquireNonBlocking()

Returns:

false is the aquire would have blocked, true if an aquire actually occured

release

public void release()

getValue

public int getValue()

Get the current value, mostly for debugging purposes. Beware: to not use this to create a check-and-aquire loop, that will create a whole in the logic. For such a algorithm, use the aquireNonBlocking.

Returns:

current value