org.apache.ode.bpel.engine

Class NStateLatch

java.lang.Object

org.apache.ode.bpel.engine.NStateLatch

public class NStateLatch
extends java.lang.Object

An N state synchronization latch useful for implementing hydration/dehydration. The latch functions as follows. At any time, the latch is in one of N states and has a count. Clients can "latch" and "release" the latch, which increments/decrements the count; however, when latching, a state must be specified. If the state does not match the current state, the latch blocks until the count is zero. Essentially, the latch can change state only when the count is zero. Every time the latch changes state an optional Runnable corresponding to the new state is executed.

Author:

Maciej Szefler ( m s z e f l e r @ g m a i l . c o m )

Field Summary

Fields

Modifier and Type	Field and Description
protected java.lang.Runnable[]	_transitions Action for state transition ?-->i

Constructor Summary

Constructors

Constructor and Description
NStateLatch(java.lang.Runnable[] transitions) Constructor, the array of Runnables defines the number of states and the transition actions.

Method Summary

Modifier and Type	Method and Description
int	getDepth(int state)
static java.lang.String	getStackTrace(java.lang.Throwable aThrowable)
void	latch(int state)
void	release(int state)

Methods inherited from class java.lang.Object

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

Field Detail

_transitions

protected java.lang.Runnable[] _transitions

Action for state transition ?-->i

Constructor Detail

NStateLatch

public NStateLatch(java.lang.Runnable[] transitions)

Constructor, the array of Runnables defines the number of states and the transition actions.

Parameters:

transitions - action to perform when entering state x.

Method Detail

latch

public void latch(int state)

release

public void release(int state)

getDepth

public int getDepth(int state)

getStackTrace

public static java.lang.String getStackTrace(java.lang.Throwable aThrowable)