com.sleepycat.je.rep.stream

Class FeederReader.SwitchWindow

java.lang.Object

com.sleepycat.je.log.FileReader.ReadWindow

com.sleepycat.je.rep.stream.FeederReader.SwitchWindow

Enclosing class:

FeederReader

static class FeederReader.SwitchWindow
extends FileReader.ReadWindow

The SwitchWindow can fill itself from either the log file or the log buffers.

Field Summary

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

endOffset, envImpl, fileManager, readBuffer, startOffset

Constructor Summary

Constructors

Constructor and Description
FeederReader.SwitchWindow(int readBufferSize, EnvironmentImpl envImpl)

Method Summary

Methods

Modifier and Type	Method and Description
protected boolean	fillNext(boolean singleFile, int bytesNeeded) Fill up the read buffer with more data, moving along to the following file (next largest number) if needed.
void	slideAndFill(long windowFileNum, long windowStartOffset, long targetOffset, boolean forward)

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

adjustReadBufferSize, containsLsn, currentFileNum, fillFromFile, getEndOffset, initAtFileStart, positionBuffer, setFileNum, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

FeederReader.SwitchWindow

FeederReader.SwitchWindow(int readBufferSize,
                         EnvironmentImpl envImpl)

Method Detail

slideAndFill

public void slideAndFill(long windowFileNum,
                long windowStartOffset,
                long targetOffset,
                boolean forward)
                  throws ChecksumException,
                         java.io.FileNotFoundException,
                         DatabaseException

Overrides:

slideAndFill in class FileReader.ReadWindow

Throws:

ChecksumException

java.io.FileNotFoundException

DatabaseException

fillNext

protected boolean fillNext(boolean singleFile,
               int bytesNeeded)
                    throws ChecksumException,
                           DatabaseException,
                           FileReader.EOFException

Fill up the read buffer with more data, moving along to the following file (next largest number) if needed. Unlike other file readers, we are reading log files that are concurrently growing, so this read window must also know to look in the log buffers. The contract between the feeder reader and the VLSNIndex lets us assume that the feeder reader is only active when it is sure that there is more data available somewhere -- whether it's in the log buffers, write queue, or on disk.

Overrides:

fillNext in class FileReader.ReadWindow

Returns:

true if the fill moved us to a new file.

Throws:

ChecksumException

DatabaseException

FileReader.EOFException

See Also:

ReadWindow#fillNext