com.sleepycat.je.tree

Class OldBINDelta

java.lang.Object

com.sleepycat.je.tree.OldBINDelta

All Implemented Interfaces:

Loggable

public class OldBINDelta
extends Object
implements Loggable

An OldBINDelta contains the information needed to create a partial (delta) BIN log entry. It also knows how to combine a full BIN log entry and a delta to generate a new BIN. An OldBINDelta is no longer written by this version of JE, but it may be read from a log file written by earlier versions.

Constructor Summary

Constructors

Constructor and Description
OldBINDelta() For instantiating from the log.
OldBINDelta(SizeofMarker marker) For Sizeof.

Method Summary

Modifier and Type	Method and Description
void	dumpLog(StringBuilder sb, boolean verbose) Write the object into the string buffer for log dumping.
DatabaseId	getDbId()
long	getLastFullLsn()
int	getLogSize()
long	getMemorySize() Returns the number of bytes occupied by this object.
long	getPrevDeltaLsn()
byte[]	getSearchKey() Returns a key that can be used to find the BIN associated with this delta.
long	getTransactionId()
boolean	logicalEquals(Loggable other) Always return false, this item should never be compared.
void	readFromLog(ByteBuffer itemBuffer, int entryVersion) Initialize this object from the data in itemBuf.
BIN	reconstituteBIN(DatabaseImpl dbImpl) Create a BIN by fetching the full version and applying the deltas.
void	reconstituteBIN(DatabaseImpl dbImpl, BIN fullBIN) Given a full version BIN, apply the deltas.
void	writeToLog(ByteBuffer logBuffer) Serialize this object into the buffer.

Methods inherited from class java.lang.Object

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

Constructor Detail

OldBINDelta

public OldBINDelta()

For instantiating from the log.

OldBINDelta

public OldBINDelta(SizeofMarker marker)

For Sizeof.

Method Detail

getDbId

public DatabaseId getDbId()

getLastFullLsn

public long getLastFullLsn()

getPrevDeltaLsn

public long getPrevDeltaLsn()

Returns:

the prior delta version of this BIN, or NULL_LSN if the prior version is a full BIN. The returned value is the LSN that is obsoleted by this delta.

getSearchKey

public byte[] getSearchKey()

Returns a key that can be used to find the BIN associated with this delta. The key of any slot will do.

reconstituteBIN

public BIN reconstituteBIN(DatabaseImpl dbImpl)

Create a BIN by fetching the full version and applying the deltas.

reconstituteBIN

public void reconstituteBIN(DatabaseImpl dbImpl,
                            BIN fullBIN)

Given a full version BIN, apply the deltas.

getLogSize

public int getLogSize()

Specified by:

getLogSize in interface Loggable

Returns:

number of bytes used to store this object.

writeToLog

public void writeToLog(ByteBuffer logBuffer)

Description copied from interface: Loggable

Serialize this object into the buffer.

Specified by:

writeToLog in interface Loggable

Parameters:

logBuffer - is the destination buffer

readFromLog

public void readFromLog(ByteBuffer itemBuffer,
                        int entryVersion)

Description copied from interface: Loggable

Initialize this object from the data in itemBuf.

Specified by:

readFromLog in interface Loggable

Parameters:

itemBuffer - the source buffer

entryVersion - the log version of the data

dumpLog

public void dumpLog(StringBuilder sb,
                    boolean verbose)

Description copied from interface: Loggable

Write the object into the string buffer for log dumping. Each object should be dumped without indentation or new lines and should be valid XML.

Specified by:

dumpLog in interface Loggable

Parameters:

sb - destination string buffer

verbose - if true, dump the full, verbose version

getTransactionId

public long getTransactionId()

Specified by:

getTransactionId in interface Loggable

Returns:

the transaction id embedded within this loggable object. Objects that have no transaction id should return 0.

logicalEquals

public boolean logicalEquals(Loggable other)

Always return false, this item should never be compared.

Specified by:

logicalEquals in interface Loggable

Returns:

true if these two loggable items are logically the same. Used for replication testing.

getMemorySize

public long getMemorySize()

Returns the number of bytes occupied by this object. Deltas are not stored in the Btree, but they are budgeted during a SortedLSNTreeWalker run.