org.multiverse.stms.alpha
Class AlphaTranlocalSnapshot

java.lang.Object
  org.multiverse.stms.alpha.AlphaTranlocalSnapshot

public abstract class AlphaTranlocalSnapshot
extends Object

A snapshot of a AlphaTranlocal. This can be used to make a snapshot and restore an Tranlocal to that state later when the transaction does a rollback. This functionality is useful for the orelse mechanism that requires rollback on Tranlocals.

A TranlocalSnapshot also is a single linked list. This is done to prevent object creation overhead.

Author:

Peter Veentjer.

Field Summary

AlphaTranlocalSnapshot

___next Each AlphaTranlocalSnapshot can also be used as a single linked list.

Constructor Summary

AlphaTranlocalSnapshot()

Method Summary

abstract AlphaTranlocal	getTranlocal() The Tranlocal that created this TranlocalSnapshot.
abstract void	restore() Does the rollback so that the Tranlocal is restored.

Methods inherited from class java.lang.Object

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

Field Detail

___next

public AlphaTranlocalSnapshot ___next

Each AlphaTranlocalSnapshot can also be used as a single linked list. Normally you would not add this kind of junk to your objects, but for performance reasons we make an exception. Object creation is very expensive en should be reduced to a minimum.

Constructor Detail

AlphaTranlocalSnapshot

public AlphaTranlocalSnapshot()

Method Detail

getTranlocal

public abstract AlphaTranlocal getTranlocal()

The Tranlocal that created this TranlocalSnapshot.

Returns:

the Tranlocal that created this AlphaTranlocalSnapshot.

restore

public abstract void restore()

Does the rollback so that the Tranlocal is restored. This method should only be called as long as the Tranlocal is not committed. No check is required to be done when it is committed.