com.atomikos.persistence.imp
Class StreamObjectLog

java.lang.Object
  com.atomikos.persistence.imp.StreamObjectLog

All Implemented Interfaces:

ObjectLog

public class StreamObjectLog
extends Object
implements ObjectLog

implementation. It keeps on growing, and only does a checkpoint on restart.

Field Summary

protected LogStream	logstream_
protected Hashtable	logTable_
protected boolean	panic_
protected long	size_

Constructor Summary

StreamObjectLog(LogStream logstream, long checkpointInterval)
Constructor.

Method Summary

void	close() Closes the log after use.
void	delete(Object id) Deletes the given object from the log.
void	flush(Recoverable rec) Flushes to permanent memory.
protected void	flush(com.atomikos.persistence.imp.SystemLogImage img, boolean shouldSync)
void	init() Initializes the object log.
Vector	recover() Recovers all non-deleted object images flushed so far.
Recoverable	recover(Object id) Recovers the instance with given ID.

Methods inherited from class java.lang.Object

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

Field Detail

logstream_

protected LogStream logstream_

logTable_

protected Hashtable logTable_

size_

protected long size_

panic_

protected boolean panic_

Constructor Detail

StreamObjectLog

public StreamObjectLog(LogStream logstream,
                       long checkpointInterval)

Constructor. Builds a new StreamObjectLog with the given logstream and the specified maximum number of entries.

Parameters:

logstream - The underlying logstream. This stream should be reserved for this instance! Upon close, the underlying stream will also be closed.

checkpointInterval - How many flush() calls between two checkpoints?

console - For output of feedback.

Method Detail

init

public void init()
          throws LogException

Description copied from interface: ObjectLog

Initializes the object log. To be called as the first method.

Specified by:

init in interface ObjectLog

Throws:

LogException - If error occurs.

See Also:

ObjectLog

recover

public Vector recover()
               throws LogException

Description copied from interface: ObjectLog

Recovers all non-deleted object images flushed so far.

Specified by:

recover in interface ObjectLog

Returns:

Vector A list of Recoverable instances, reconstructed from their images.

Throws:

LogException

See Also:

ObjectLog

flush

public void flush(Recoverable rec)
           throws LogException

Description copied from interface: ObjectLog

Flushes to permanent memory.

Specified by:

flush in interface ObjectLog

Parameters:

rec - Recoverable instance. NOTE: if the instance has the same ObjectId as a previous one, then the latter will be overridden by this one! More precisely, history() will only return the last image for a given ObjectId.

Throws:

LogException - if it did not work.

See Also:

ObjectLog

flush

protected void flush(com.atomikos.persistence.imp.SystemLogImage img,
                     boolean shouldSync)
              throws LogException

Throws:

LogException

recover

public Recoverable recover(Object id)
                    throws LogException

Description copied from interface: ObjectLog

Recovers the instance with given ID.

Specified by:

recover in interface ObjectLog

Parameters:

id - The id to recover. @return Recoverable The recovered logimage, null if not found. @exception LogException On failure.

Throws:

LogException

See Also:

ObjectLog

delete

public void delete(Object id)
            throws LogException

Description copied from interface: ObjectLog

Deletes the given object from the log.

Specified by:

delete in interface ObjectLog

Parameters:

id - The object UID.

Throws:

LogException - on failure.

See Also:

ObjectLog

close

public void close()
           throws LogException

Description copied from interface: ObjectLog

Closes the log after use.

Specified by:

close in interface ObjectLog

Throws:

LogException - on failure.

See Also:

ObjectLog