com.sleepycat.je.log.entry

Class LNLogEntry

java.lang.Object

com.sleepycat.je.log.entry.LNLogEntry

All Implemented Interfaces:

LogEntry, NodeLogEntry, java.lang.Cloneable

Direct Known Subclasses:

DeletedDupLNLogEntry

public class LNLogEntry
extends java.lang.Object
implements LogEntry, NodeLogEntry

LNLogEntry embodies all LN transactional log entries. On disk, an LN log entry contains:

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

Constructor Summary

Constructors

Constructor and Description
LNLogEntry(java.lang.Class 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()
byte[]	getDupKey()
byte[]	getKey()
LN	getLN()
LogEntryType	getLogType()
java.lang.Object	getMainItem()
long	getNodeId() Returns the node ID.
int	getSize()
long	getTransactionId()
java.lang.Long	getTxnId()
Txn	getUserTxn()
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 an log entry.
void	setLastLoggedSize(int size) By default, do nothing.
void	setLogType(LogEntryType entryType) Inform a BaseEntry instance of its corresponding LogEntryType.
void	writeEntry(LogEntryHeader header, java.nio.ByteBuffer destBuffer) Serialize this object into the buffer.

Methods inherited from class java.lang.Object

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

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

getLogType, setLogType

Constructor Detail

LNLogEntry

public LNLogEntry(java.lang.Class 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 an 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

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()

Specified by:

getSize in interface LogEntry

Returns:

size of byte buffer needed to store this entry.

setLastLoggedSize

public void setLastLoggedSize(int size)

By default, do nothing. This is overridden by some entries (LNs) to save the last logged size

Specified by:

setLastLoggedSize in interface LogEntry

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

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

Throws:

DatabaseException

See Also:

LogEntry.postLogWork(long)

getLN

public LN getLN()

getDbId

public DatabaseId getDbId()

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()

setLogType

public void setLogType(LogEntryType entryType)

Inform a BaseEntry instance of its corresponding LogEntryType.

getLogType

public LogEntryType getLogType()

Returns:

the type of log entry