com.sleepycat.je.rep.stream

Class FeederSyncupReader

java.lang.Object

com.sleepycat.je.log.FileReader

com.sleepycat.je.rep.stream.VLSNReader

com.sleepycat.je.rep.stream.FeederSyncupReader

public class FeederSyncupReader
extends VLSNReader

The FeederSyncupReader scans the log backwards for requested log entries. It uses the vlsnIndex to optimize its search, repositioning when a concrete vlsn->lsn mapping is available. The FeederSyncupReader is not thread safe, and can only be used serially. It will stop at the finishLsn, which should be set using the GlobalCBVLSN.

Nested Class Summary

Nested classes/interfaces inherited from class com.sleepycat.je.log.FileReader

FileReader.EOFException, FileReader.ReadWindow

Field Summary

Fields inherited from class com.sleepycat.je.rep.stream.VLSNReader

currentFeedRecord, currentVLSN, nReposition, nScanned, vlsnIndex

Fields inherited from class com.sleepycat.je.log.FileReader

cksumValidator, currentEntryHeader, currentEntryOffset, currentEntryPrevOffset, envImpl, eof, fileManager, forward, logger, nextEntryOffset, startLsn, window

Constructor Summary

Constructors

Constructor and Description
FeederSyncupReader(EnvironmentImpl envImpl, VLSNIndex vlsnIndex, long endOfLogLsn, int readBufferSize, NameIdPair nameIdPair, VLSN startVLSN, long finishLsn)

Method Summary

Methods

Modifier and Type	Method and Description
protected boolean	isTargetEntry()
protected boolean	processEntry(java.nio.ByteBuffer entryBuffer) Instantiate a WireRecord to house this log entry.
OutputWireRecord	scanBackwards(VLSN vlsn) Backward scanning for records for the feeder's part in syncup.

Methods inherited from class com.sleepycat.je.rep.stream.VLSNReader

getNReposition, getNScanned, resetStats, setPosition

Methods inherited from class com.sleepycat.je.log.FileReader

entryIsReplicated, getAndResetNReads, getLastEntrySize, getLastLsn, getNRepeatIteratorReads, getNumRead, initStartingPosition, makeWindow, readNextEntry, readNextEntryAllowExceptions, resyncReader, setAlwaysValidateChecksum, setBackwardPosition, setForwardPosition, skipData, skipEntry

Methods inherited from class java.lang.Object

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

Constructor Detail

FeederSyncupReader

public FeederSyncupReader(EnvironmentImpl envImpl,
                  VLSNIndex vlsnIndex,
                  long endOfLogLsn,
                  int readBufferSize,
                  NameIdPair nameIdPair,
                  VLSN startVLSN,
                  long finishLsn)
                   throws java.io.IOException,
                          DatabaseException

Throws:

java.io.IOException

DatabaseException

Method Detail

scanBackwards

public OutputWireRecord scanBackwards(VLSN vlsn)
                               throws java.io.FileNotFoundException,
                                      ChecksumException

Backward scanning for records for the feeder's part in syncup.

Throws:

ChecksumException

java.io.FileNotFoundException

isTargetEntry

protected boolean isTargetEntry()
                         throws DatabaseException

Overrides:

isTargetEntry in class FileReader

Returns:

true if this reader should process this entry, or just skip over it.

Throws:

DatabaseException - from subclasses.

processEntry

protected boolean processEntry(java.nio.ByteBuffer entryBuffer)

Instantiate a WireRecord to house this log entry.

Overrides:

processEntry in class VLSNReader

Parameters:

entryBuffer - contains the entry data and is positioned at the data

Returns:

true if this entry should be returned