alt.jiapi.event

Class JiapiEvent

java.lang.Object

java.util.EventObject

alt.jiapi.event.JiapiEvent

All Implemented Interfaces:

java.io.Serializable

Direct Known Subclasses:

ExceptionEvent, FieldEvent, MethodEvent

public class JiapiEvent
extends java.util.EventObject

Base class for Jiapi events. This method is safe, in terms of event loop protection. That is, calling methods of JiapiEvent is guaranteed not to produce any further events from occuring.

Version:

$Revision: 1.7 $ $Date: 2002/03/26 08:16:13 $

Author:

Mika Riekkinen, Joni Suominen

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
protected int	id
protected java.lang.Object	sourceObject
protected java.lang.Object	target
protected java.lang.String	targetName

Fields inherited from class java.util.EventObject

source

Constructor Summary

Constructors

Constructor and Description
JiapiEvent(EventProducer ep, java.lang.Object sourceObject, java.lang.String targetName, int id) Constructor for JiapiEvent.
JiapiEvent(EventProducer ep, java.lang.Object sourceObject, java.lang.String targetName, java.lang.Object target, int id) Constructor for JiapiEvent.

Method Summary

Modifier and Type	Method and Description
void	finalize() Finalization releases possible locks made on EventProducer.
java.lang.Object	getSourceObject() Get the source Object.
java.lang.Object	getTarget() Gets target Object.
java.lang.String	getTargetName() Gets the name associated with this event.
void	protect() This method protects application from entering into recursive event loop.
void	release() This method releases EventProducer so, that it is able to produce more events for the sourceObject.
java.lang.String	toString()

Methods inherited from class java.util.EventObject

getSource

Methods inherited from class java.lang.Object

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

Field Detail

id

protected int id

sourceObject

protected java.lang.Object sourceObject

target

protected java.lang.Object target

targetName

protected java.lang.String targetName

Constructor Detail

JiapiEvent

public JiapiEvent(EventProducer ep,
                  java.lang.Object sourceObject,
                  java.lang.String targetName,
                  int id)

Constructor for JiapiEvent. Target is set to null.

Parameters:

ep - EventProducer

sourceObject - Source Object.

targetName - name of the target Object

id - Id of the event

JiapiEvent

public JiapiEvent(EventProducer ep,
                  java.lang.Object sourceObject,
                  java.lang.String targetName,
                  java.lang.Object target,
                  int id)

Constructor for JiapiEvent.

Parameters:

ep - EventProducer. This is passed to parent class with super(ep);

sourceObject - Source Object.

targetName - name of the target Object

target - target Object

id - Id of the event

Method Detail

finalize

public void finalize()

Finalization releases possible locks made on EventProducer.

Overrides:

finalize in class java.lang.Object

getSourceObject

public java.lang.Object getSourceObject()

Get the source Object.

Returns:

source Object

getTarget

public java.lang.Object getTarget()

Gets target Object.

Returns:

target Object or null, if target is not specified.

getTargetName

public java.lang.String getTargetName()

Gets the name associated with this event. For example, MethodEvent provides name of the method and FieldEvent provides name of the field.

Returns:

name of the target

protect

public void protect()

This method protects application from entering into recursive event loop. This situation may occur, if a method has been instrumented, and instrumentation produces an event. If that method is called, directly or indirectly, with the aid of JiapiEvent, application will enter to an endless event loop, eventually crashing Virtual Machine.

Calling this method prevents EventProducer from producing further events for the same sourceObject. This protection mechanism allows applications to call methods of sourceObject and targetObject without worrying about event loops.

To enable events again, one will have to release EventProducer with method release.

See Also:

EventProducer.protect(JiapiEvent), release()

release

public void release()

This method releases EventProducer so, that it is able to produce more events for the sourceObject.

See Also:

EventProducer.release(JiapiEvent), protect()

toString

public java.lang.String toString()

Overrides:

toString in class java.util.EventObject