goodsjpi
Class OptimisticMetaobject

java.lang.Object
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  +--goodsjpi.Metaobject
        |
        +--goodsjpi.BasicMetaobject
              |
              +--goodsjpi.OptimisticMetaobject

public class OptimisticMetaobject

extends BasicMetaobject

Metaobject for optimistic scheme of synchronization. Optimistic means we don't lock. Multiple Readers, multiple Writers would be another way of putting it.

Another way to say this is of course, "You'd better know what you're doing", and then later, "You've been warned".
On the other hand, if you do know that this is no problem, the benefit is that you save the time for the locking (which is a network request in the Pessimistic case)

Field Summary

Fields inherited from class goodsjpi.Metaobject

CONSTRUCTOR, EXCEPTION, MUTATOR, VARIABLE

Constructor Summary

OptimisticMetaobject()

Method Summary

void	beginReadAccess(goodsjpi.Persistent obj) beginReadAccess is a no-op.
void	beginWriteAccess(goodsjpi.Persistent obj) beginWriteAccess is a no-op.
void	endAccess(goodsjpi.Persistent obj) endAccess adds the object to the cache managers transaction list if the object has been modified.

Methods inherited from class goodsjpi.BasicMetaobject

abortTransaction, abortTransaction, beginNestedTransaction, commitObjectChanges, commitTransaction, destroyObject, endNestedTransaction, forgetObject, invalidateObject, loadObject, makePersistent, notifyOnModification, postDaemon, preDaemon, preloadObject, releaseObject, sendForgottenObjectsToServers, undoObjectChanges

Methods inherited from class goodsjpi.Metaobject

modify, mutator

Methods inherited from class java.lang.Object

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

Constructor Detail

OptimisticMetaobject

public OptimisticMetaobject()

Method Detail

beginWriteAccess

public void beginWriteAccess(goodsjpi.Persistent obj)

beginWriteAccess is a no-op. That's why it's optimistic.

Specified by:

beginWriteAccess in class Metaobject

Parameters:

obj - a Persistent object to be modified.

endAccess

public void endAccess(goodsjpi.Persistent obj)

endAccess adds the object to the cache managers transaction list if the object has been modified.

Specified by:

endAccess in class Metaobject

Parameters:

obj - a Persistent object that was (or was not) modified.

beginReadAccess

public void beginReadAccess(goodsjpi.Persistent obj)

beginReadAccess is a no-op. We're being optimistic, remember.

Specified by:

beginReadAccess in class Metaobject

Parameters:

obj - a Persistent object to be modified.