com.sleepycat.je.log.entry

Class LNLogEntry

java.lang.Object

com.sleepycat.je.log.entry.BaseEntry

com.sleepycat.je.log.entry.LNLogEntry

All Implemented Interfaces:

LogEntry, NodeLogEntry, java.lang.Cloneable

Direct Known Subclasses:

DeletedDupLNLogEntry, NameLNLogEntry

public class LNLogEntry
extends BaseEntry
implements LogEntry, NodeLogEntry

LNLogEntry embodies all LN transactional log entries. On disk, an LN log entry contains (pre version 6)

   LN
   databaseid
   key
   abortLsn          -- if transactional
   abortKnownDeleted -- if transactional
   txn               -- if transactional

 (version 6)
   databaseid
   abortLsn          -- if transactional
   abortKnownDeleted -- if transactional
   txn               -- if transactional
   LN
   key
 

Before version 6, a non-full-item read of a log entry only retrieved the node id. After version 6, the database id, transaction id and node id are all available.

Field Summary

Fields inherited from class com.sleepycat.je.log.entry.BaseEntry

entryType, logClass

Constructor Summary

Constructors

Constructor and Description
LNLogEntry(java.lang.Class<? extends LN> LNClass)
LNLogEntry(LogEntryType entryType, LN ln, DatabaseId dbId, byte[] key, long abortLsn, boolean abortKnownDeleted, Txn txn)

Method Summary

Methods

Modifier and Type	Method and Description
java.lang.Object	clone()
boolean	countAsObsoleteWhenLogged() Returns true for a deleted LN to count it immediately as obsolete.
java.lang.StringBuffer	dumpEntry(java.lang.StringBuffer sb, boolean verbose) Print out the contents of an entry.
boolean	getAbortKnownDeleted()
long	getAbortLsn()
DatabaseId	getDbId() All node entries have a database ID.
byte[]	getDupKey()
byte[]	getKey()
int	getLastLoggedSize() Returns the last logged size, saved by readEntry and writeEntry.
LN	getLN()
java.lang.Object	getMainItem()
long	getNodeId() Returns the node ID.
int	getSize() #see LogEntry#getSize
long	getTransactionId()
java.lang.Long	getTxnId()
Txn	getUserTxn()
boolean	logicalEquals(LogEntry other)
void	postLogWork(long justLoggedLsn) For LN entries, we need to record the latest LSN for that node with the owning transaction, within the protection of the log latch.
void	readEntry(LogEntryHeader header, java.nio.ByteBuffer entryBuffer, boolean readFullItem) Read in a log entry.
void	writeEntry(LogEntryHeader header, java.nio.ByteBuffer destBuffer) Serialize this object into the buffer.

Methods inherited from class com.sleepycat.je.log.entry.BaseEntry

getLogType, setLogType, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.sleepycat.je.log.entry.LogEntry

getLogType, setLogType

Constructor Detail

LNLogEntry

public LNLogEntry(java.lang.Class<? extends LN> LNClass)

LNLogEntry

public LNLogEntry(LogEntryType entryType,
          LN ln,
          DatabaseId dbId,
          byte[] key,
          long abortLsn,
          boolean abortKnownDeleted,
          Txn txn)

Method Detail

readEntry

public void readEntry(LogEntryHeader header,
             java.nio.ByteBuffer entryBuffer,
             boolean readFullItem)
               throws DatabaseException

Description copied from interface: LogEntry

Read in a log entry.

Specified by:

readEntry in interface LogEntry

Throws:

DatabaseException

See Also:

LogEntry.readEntry(com.sleepycat.je.log.LogEntryHeader, java.nio.ByteBuffer, boolean)

dumpEntry

public java.lang.StringBuffer dumpEntry(java.lang.StringBuffer sb,
                               boolean verbose)

Description copied from interface: LogEntry

Print out the contents of an entry.

Specified by:

dumpEntry in interface LogEntry

Specified by:

dumpEntry in class BaseEntry

See Also:

LogEntry.dumpEntry(java.lang.StringBuffer, boolean)

getMainItem

public java.lang.Object getMainItem()

Specified by:

getMainItem in interface LogEntry

Returns:

the first item of the log entry

See Also:

LogEntry.getMainItem()

clone

public java.lang.Object clone()
                       throws java.lang.CloneNotSupportedException

Specified by:

clone in interface LogEntry

Overrides:

clone in class java.lang.Object

Returns:

a shallow clone.

Throws:

java.lang.CloneNotSupportedException

See Also:

LogEntry.clone()

getTransactionId

public long getTransactionId()

Specified by:

getTransactionId in interface LogEntry

Returns:

return the transaction id if this log entry is transactional, 0 otherwise.

See Also:

LogEntry.getTransactionId()

getNodeId

public long getNodeId()

Description copied from interface: NodeLogEntry

Returns the node ID. This value is redundant with the main item (Node) of a log entry. It is returned separately so that it can be obtained when the entry's main item (Node) is not loaded. Partial loading is an optimization for recovery.

Specified by:

getNodeId in interface NodeLogEntry

See Also:

NodeLogEntry.getNodeId()

getSize

public int getSize()

#see LogEntry#getSize

Specified by:

getSize in interface LogEntry

Returns:

size of byte buffer needed to store this entry.

getLastLoggedSize

public int getLastLoggedSize()

Returns the last logged size, saved by readEntry and writeEntry.

Specified by:

getLastLoggedSize in interface LogEntry

Overrides:

getLastLoggedSize in class BaseEntry

Returns:

total size of last logged entry, or zero if unknown. The last logged size is known for LNs, and is used for obsolete size counting.

writeEntry

public void writeEntry(LogEntryHeader header,
              java.nio.ByteBuffer destBuffer)

Description copied from interface: LogEntry

Serialize this object into the buffer.

Specified by:

writeEntry in interface LogEntry

destBuffer - is the destination buffer

See Also:

LogEntry.writeEntry(com.sleepycat.je.log.LogEntryHeader, java.nio.ByteBuffer)

countAsObsoleteWhenLogged

public boolean countAsObsoleteWhenLogged()

Returns true for a deleted LN to count it immediately as obsolete.

Specified by:

countAsObsoleteWhenLogged in interface LogEntry

Overrides:

countAsObsoleteWhenLogged in class BaseEntry

See Also:

LogEntry.countAsObsoleteWhenLogged()

postLogWork

public void postLogWork(long justLoggedLsn)
                 throws DatabaseException

For LN entries, we need to record the latest LSN for that node with the owning transaction, within the protection of the log latch. This is a callback for the log manager to do that recording.

Specified by:

postLogWork in interface LogEntry

Overrides:

postLogWork in class BaseEntry

Throws:

DatabaseException

See Also:

LogEntry.postLogWork(long)

getLN

public LN getLN()

getDbId

public DatabaseId getDbId()

Description copied from interface: NodeLogEntry

All node entries have a database ID.

Specified by:

getDbId in interface NodeLogEntry

getKey

public byte[] getKey()

getDupKey

public byte[] getDupKey()

getAbortLsn

public long getAbortLsn()

getAbortKnownDeleted

public boolean getAbortKnownDeleted()

getTxnId

public java.lang.Long getTxnId()

getUserTxn

public Txn getUserTxn()

logicalEquals

public boolean logicalEquals(LogEntry other)

Specified by:

logicalEquals in interface LogEntry

Returns:

true if these two log entries are logically the same. Used for replication.

See Also:

LogEntry.logicalEquals(com.sleepycat.je.log.entry.LogEntry)