org.apache.jackrabbit.core.journal

Class FileRevision

java.lang.Object

org.apache.jackrabbit.core.journal.FileRevision

All Implemented Interfaces:

InstanceRevision

public class FileRevision
extends Object
implements InstanceRevision

Maintains a file-based revision counter with locking, assuring uniqueness.

Field Summary

Fields

Modifier and Type	Field and Description
protected boolean	closed Flag indicating whether this revision file is closed.
protected RandomAccessFile	raf Underlying random access file.
protected boolean	sync Flag indicating whether to sync the file on every write.
protected long	value Cached value.

Constructor Summary

Constructors

Constructor and Description
FileRevision(File file, boolean sync) Creates a new file based revision counter.

Method Summary

Modifier and Type	Method and Description
void	close() Close file revision.
long	get() Return current counter value.
void	set(long value) Set current counter value.

Methods inherited from class java.lang.Object

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

Field Detail

raf

protected final RandomAccessFile raf

Underlying random access file.

sync

protected final boolean sync

Flag indicating whether to sync the file on every write.

value

protected long value

Cached value.

closed

protected boolean closed

Flag indicating whether this revision file is closed.

Constructor Detail

FileRevision

public FileRevision(File file,
                    boolean sync)
             throws JournalException

Creates a new file based revision counter.

Parameters:

file - holding global counter

sync - whether to sync the file on every write

Throws:

JournalException - if some error occurs

Method Detail

get

public long get()
         throws JournalException

Return current counter value.

Specified by:

get in interface InstanceRevision

Returns:

counter value

Throws:

JournalException - if some error occurs

set

public void set(long value)
         throws JournalException

Set current counter value.

Specified by:

set in interface InstanceRevision

Parameters:

value - new counter value

Throws:

JournalException - if some error occurs

close

public void close()

Close file revision. Closes underlying random access file.

Specified by:

close in interface InstanceRevision