org.apache.commons.transaction.file
Class MemoryUndoManager

java.lang.Object
  org.apache.commons.transaction.file.MemoryUndoManager

All Implemented Interfaces:

FileResourceUndoManager

public class MemoryUndoManager
extends Object
implements FileResourceUndoManager

Default implementation of FileResourceUndoManager.

Undo information is held in memory only. Changed content streams are stored as temporary files.

Caution:This implementation does not guarantee ACID properties after a JVM crash.

This implementation is thread-safe.

Nested Class Summary

protected class

MemoryUndoManager.UndoRecord

Nested classes/interfaces inherited from interface org.apache.commons.transaction.file.FileResourceUndoManager

FileResourceUndoManager.Code

Field Summary

protected ThreadLocal<List<MemoryUndoManager.UndoRecord>>

localRecords

Constructor Summary

MemoryUndoManager(String logDir)

Method Summary

void	forgetRecord()
void	recordCreate(File file)
void	recordDelete(File file)
void	recordUpdate(File file)
protected void	recordUpdate(File file, boolean moveAllowed)
void	startRecord()
protected void	storeRecord(MemoryUndoManager.UndoRecord record)
void	undoRecord()

Methods inherited from class java.lang.Object

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

Field Detail

localRecords

protected ThreadLocal<List<MemoryUndoManager.UndoRecord>> localRecords

Constructor Detail

MemoryUndoManager

public MemoryUndoManager(String logDir)
                  throws IOException

Throws:

IOException

Method Detail

startRecord

public void startRecord()

Specified by:

startRecord in interface FileResourceUndoManager

undoRecord

public void undoRecord()

Specified by:

undoRecord in interface FileResourceUndoManager

forgetRecord

public void forgetRecord()

Specified by:

forgetRecord in interface FileResourceUndoManager

storeRecord

protected void storeRecord(MemoryUndoManager.UndoRecord record)

recordUpdate

public void recordUpdate(File file)

Specified by:

recordUpdate in interface FileResourceUndoManager

recordUpdate

protected void recordUpdate(File file,
                            boolean moveAllowed)

recordCreate

public void recordCreate(File file)

Specified by:

recordCreate in interface FileResourceUndoManager

recordDelete

public void recordDelete(File file)

Specified by:

recordDelete in interface FileResourceUndoManager