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com.yaftp.utils
Class TokenSemaphore  

java.lang.Object
  com.yaftp.utils.TokenSemaphore

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public class TokenSemaphore

extends java.lang.Object

Copyright Jean-Yves MENGANT 1998,1999,2000 This class implements a MUTUAL EXCLUSIVE semaphore access using internal _tokenIsReady flag use this to synchronize concurent access to a single ressource Implementation is based on OReilly JAVA THREAD book examples

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Field Summary
private  int	_busyCount
private  boolean	_debug
static boolean	_DEBUG_MODE_
private  java.lang.String	_name
private  java.lang.Thread	_owner
static boolean	_SET_BUSY_
static boolean	_SET_FREE_

 

Constructor Summary

TokenSemaphore(java.lang.String name, boolean tokenState)           basic constructor

TokenSemaphore(java.lang.String name, boolean tokenState, boolean debug)           debug Constructor

 

Method Summary
private  void	debug(java.lang.String dbg)
void	freeSemaphore()           free synchronized ressource
private  java.lang.Thread	getBusyCountOwner()
private  void	initInstance(java.lang.String name, boolean tokenState)
boolean	isBusy()           returns true if object is belonging to some thread
static void	main(java.lang.String[] arg)           Unit Testing semaphores
void	set_debug(boolean debug)
private  boolean	tryGetToken()           request token primitive
void	waitForOwning(java.lang.Thread owner)           put a clean waiting process when a thread is waiting upon another thread getting ressource property
void	waitForSemaphore()           wait for synchronized ressource

 

Methods inherited from class java.lang.Object

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

 

Field Detail

_busyCount

private transient int _busyCount

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_owner

private transient java.lang.Thread _owner

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_name

private transient java.lang.String _name

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_debug

private transient boolean _debug

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_SET_BUSY_

public static final boolean _SET_BUSY_

See Also:

Constant Field Values

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_SET_FREE_

public static final boolean _SET_FREE_

See Also:

Constant Field Values

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_DEBUG_MODE_

public static final boolean _DEBUG_MODE_

See Also:

Constant Field Values

Constructor Detail

TokenSemaphore

public TokenSemaphore(java.lang.String name,
                      boolean tokenState)

basic constructor

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TokenSemaphore

public TokenSemaphore(java.lang.String name,
                      boolean tokenState,
                      boolean debug)

debug Constructor

Method Detail

set_debug

public void set_debug(boolean debug)

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debug

private void debug(java.lang.String dbg)

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initInstance

private void initInstance(java.lang.String name,
                          boolean tokenState)

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getBusyCountOwner

private java.lang.Thread getBusyCountOwner()

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tryGetToken

private boolean tryGetToken()

request token primitive

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waitForSemaphore

public void waitForSemaphore()

wait for synchronized ressource

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freeSemaphore

public void freeSemaphore()

free synchronized ressource

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waitForOwning

public void waitForOwning(java.lang.Thread owner)

put a clean waiting process when a thread is waiting upon another thread getting ressource property

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isBusy

public boolean isBusy()

returns true if object is belonging to some thread

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main

public static void main(java.lang.String[] arg)

Unit Testing semaphores

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