com.sleepycat.je.cleaner
Class PackedOffsets

java.lang.Object
  com.sleepycat.je.cleaner.PackedOffsets

All Implemented Interfaces:

Loggable

public class PackedOffsets
extends Object
implements Loggable

Stores a sorted list of LSN offsets in a packed short representation. Each stored value is the difference between two consecutive offsets. The stored values are stored as one or more shorts where each short holds 0x7fff values. Shorts are in LSB order. The value is negated if more shorts for the same offset follow; this works because offsets are always positive values.

Nested Class Summary

(package private) class

PackedOffsets.Iterator An iterator over all offsets.

Constructor Summary

PackedOffsets()
Creates an empty object.

Method Summary

void	dumpLog(StringBuilder buf, boolean verbose) Write the object into the string buffer for log dumping.
int	getExtraMemorySize() Return the extra memory used by this object when the pack() method has been called to allocate the data array.
int	getLogSize()
long	getTransactionId() Never called.
(package private) PackedOffsets.Iterator	iterator() Returns an iterator over all offsets.
boolean	logicalEquals(Loggable other)
void	pack(long[] offsets) Packs the given offsets, replacing any offsets stored in this object.
void	readFromLog(ByteBuffer buf, int entryVersion) Initialize this object from the data in itemBuf.
(package private) long[]	toArray() Returns the unpacked offsets.
String	toString()
void	writeToLog(ByteBuffer buf) Serialize this object into the buffer.

Methods inherited from class java.lang.Object

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

Constructor Detail

PackedOffsets

public PackedOffsets()

Creates an empty object.

Method Detail

iterator

PackedOffsets.Iterator iterator()

Returns an iterator over all offsets.

pack

public void pack(long[] offsets)

Packs the given offsets, replacing any offsets stored in this object.

toArray

long[] toArray()

Returns the unpacked offsets.

getExtraMemorySize

public int getExtraMemorySize()

Return the extra memory used by this object when the pack() method has been called to allocate the data array.

getLogSize

public int getLogSize()

Specified by:

getLogSize in interface Loggable

Returns:

number of bytes used to store this object.

See Also:

Loggable.getLogSize()

writeToLog

public void writeToLog(ByteBuffer buf)

Description copied from interface: Loggable

Serialize this object into the buffer.

Specified by:

writeToLog in interface Loggable

Parameters:

buf - is the destination buffer

See Also:

Loggable.writeToLog(java.nio.ByteBuffer)

readFromLog

public void readFromLog(ByteBuffer buf,
                        int entryVersion)

Description copied from interface: Loggable

Initialize this object from the data in itemBuf.

Specified by:

readFromLog in interface Loggable

See Also:

Loggable.readFromLog(java.nio.ByteBuffer, int)

dumpLog

public void dumpLog(StringBuilder buf,
                    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:

buf - destination string buffer

verbose - if true, dump the full, verbose version

See Also:

Loggable.dumpLog(java.lang.StringBuilder, boolean)

getTransactionId

public long getTransactionId()

Never called.

Specified by:

getTransactionId in interface Loggable

Returns:

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

See Also:

Loggable.getTransactionId()

logicalEquals

public boolean logicalEquals(Loggable other)

Specified by:

logicalEquals in interface Loggable

Returns:

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

See Also:

Always return false, this item should never be compared.

toString

public String toString()

Overrides:

toString in class Object