com.sleepycat.je.log

Class CheckpointFileReader

java.lang.Object

com.sleepycat.je.log.FileReader

com.sleepycat.je.log.CheckpointFileReader

public class CheckpointFileReader
extends FileReader

CheckpointFileReader searches for root and checkpoint entries.

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.log.FileReader

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

Constructor Summary

Constructors

Constructor and Description
CheckpointFileReader(EnvironmentImpl env, int readBufferSize, boolean forward, long startLsn, long finishLsn, long endOfFileLsn) Create this reader to start at a given LSN.

Method Summary

Modifier and Type	Method and Description
boolean	isCheckpointEnd()
boolean	isCheckpointStart()
boolean	isDbTree()
protected boolean	isTargetEntry() This method is called by readNextEntry() after the header of the current logrec has been de-serialized, but not the body.
protected boolean	processEntry(ByteBuffer entryBuffer) This reader instantiates the first object of a given log entry

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

entryIsReplicated, getAndResetNReads, getLastEntrySize, getLastLsn, getLastVlsn, getLogVersion, getNRepeatIteratorReads, getNumRead, handleGapInBackwardsScan, initStartingPosition, makeWindow, readNextEntry, readNextEntryAllowExceptions, 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

CheckpointFileReader

public CheckpointFileReader(EnvironmentImpl env,
                            int readBufferSize,
                            boolean forward,
                            long startLsn,
                            long finishLsn,
                            long endOfFileLsn)
                     throws DatabaseException

Create this reader to start at a given LSN.

Throws:

DatabaseException

Method Detail

isTargetEntry

protected boolean isTargetEntry()

Description copied from class: FileReader

This method is called by readNextEntry() after the header of the current logrec has been de-serialized, but not the body. Based on header info only, it may perform some actions and then decide whether the rest of the logrec should be de-serialized or just skipped.

Overrides:

isTargetEntry in class FileReader

Returns:

true if this is a targeted entry.

processEntry

protected boolean processEntry(ByteBuffer entryBuffer)

This reader instantiates the first object of a given log entry

Specified by:

processEntry in class FileReader

Parameters:

entryBuffer - A ByteBuffer that the logrec data and is positioned at the start of the logrec body (i.e., just after the logrec header).

Returns:

true if this entry should be returned to the caller of readNextEntry().

isDbTree

public boolean isDbTree()

Returns:

true if last entry was a DbTree entry.

isCheckpointEnd

public boolean isCheckpointEnd()

Returns:

true if last entry was a checkpoint end entry.

isCheckpointStart

public boolean isCheckpointStart()

Returns:

true if last entry was a checkpoint start entry.