org.apache.tapestry.record
Class PageRecorderImpl

java.lang.Object
  org.apache.tapestry.record.PageRecorderImpl

All Implemented Interfaces:

IPageRecorder, ChangeObserver

public class PageRecorderImpl
extends Object
implements IPageRecorder

Since:

4.0

Author:

Howard M. Lewis Ship

Constructor Summary

PageRecorderImpl(String pageName, PropertyPersistenceStrategySource strategySource, org.apache.hivemind.ErrorLog log)

Method Summary

void	commit() Persists all changes that have been accumulated.
Collection	getChanges()
boolean	isLocked() Checks if the current state changes have already been committed.
void	observeChange(ObservedChangeEvent event) Sent when the observed object changes a property.
void	rollback(IPage page) Rolls back the page to the currently persisted state.

Methods inherited from class java.lang.Object

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

Constructor Detail

PageRecorderImpl

public PageRecorderImpl(String pageName,
                        PropertyPersistenceStrategySource strategySource,
                        org.apache.hivemind.ErrorLog log)

Method Detail

commit

public void commit()

Description copied from interface: IPageRecorder

Persists all changes that have been accumulated. If the recorder saves change incrementally, this should ensure that all changes have been persisted.

After commiting, a page recorder automatically locks itself.

Specified by:

commit in interface IPageRecorder

isLocked

public boolean isLocked()

Description copied from interface: ChangeObserver

Checks if the current state changes have already been committed.

Specified by:

isLocked in interface ChangeObserver

Returns:

True if state changes are locked, false otherwise.

getChanges

public Collection getChanges()

rollback

public void rollback(IPage page)

Description copied from interface: IPageRecorder

Rolls back the page to the currently persisted state.

A page recorder can only rollback changes to properties which have changed at some point. This can cause some minor problems, addressed by PageDetachListener.pageDetached(org.apache.tapestry.event.PageEvent).

Specified by:

rollback in interface IPageRecorder

observeChange

public void observeChange(ObservedChangeEvent event)

Description copied from interface: ChangeObserver

Sent when the observed object changes a property. The event identifies the object, the property and the new value.

Specified by:

observeChange in interface ChangeObserver