org.exist.storage.journal
Class Lsn

java.lang.Object
  org.exist.storage.journal.Lsn

public class Lsn

extends java.lang.Object

Log Sequence Number: identifies a log record within the journal file. A LSN is represented by a Java long and consists of the file number of the journal file and an offset into the file.

Author:

wolf

Field Summary

static long

LSN_INVALID

Constructor Summary

Lsn()

Method Summary

static long	create(int fileNumber, int offset)
static java.lang.String	dump(long lsn)
static long	getFileNumber(long lsn) Returns the file number encoded in the passed LSN.
static long	getOffset(long lsn) Returns the file offset encoded in the passed LSN.

Methods inherited from class java.lang.Object

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

Field Detail

LSN_INVALID

public static final long LSN_INVALID

See Also:

Constant Field Values

Constructor Detail

Lsn

public Lsn()

Method Detail

create

public static long create(int fileNumber,
                          int offset)

getFileNumber

public static long getFileNumber(long lsn)

Returns the file number encoded in the passed LSN.

Parameters:

lsn -

Returns:

getOffset

public static long getOffset(long lsn)

Returns the file offset encoded in the passed LSN.

Parameters:

lsn -

Returns:

dump

public static java.lang.String dump(long lsn)