Package org.elasticsearch.index.translog

Class BaseTranslogReader

java.lang.Object

org.elasticsearch.index.translog.BaseTranslogReader

All Implemented Interfaces:

Comparable<BaseTranslogReader>

Direct Known Subclasses:

TranslogReader, TranslogWriter

public abstract class BaseTranslogReader
extends Object
implements Comparable<BaseTranslogReader>

A base class for all classes that allows reading ops from translog files

Field Summary

Fields

Modifier and Type	Field	Description
protected FileChannel	channel
protected long	generation
protected org.elasticsearch.index.translog.TranslogHeader	header
protected Path	path

Constructor Summary

Constructors

Constructor	Description
BaseTranslogReader(long generation, FileChannel channel, Path path, org.elasticsearch.index.translog.TranslogHeader header)

Method Summary

Modifier and Type	Method	Description
protected BufferedChecksumStreamInput	checksummedStream(ByteBuffer reusableBuffer, long position, int opSize, BufferedChecksumStreamInput reuse)	reads an operation at the given position and returns it.
int	compareTo(BaseTranslogReader o)
long	getFirstOperationOffset()
long	getGeneration()
long	getLastModifiedTime()
long	getPrimaryTerm()	Returns the primary term associated with this translog reader.
org.elasticsearch.index.translog.TranslogSnapshot	newSnapshot()
Path	path()
protected Translog.Operation	read(BufferedChecksumStreamInput inStream)
protected abstract void	readBytes(ByteBuffer buffer, long position)	reads bytes at position into the given buffer, filling it.
protected int	readSize(ByteBuffer reusableBuffer, long position)	read the size of the op (i.e., number of bytes, including the op size) written at the given position
abstract long	sizeInBytes()
String	toString()
abstract int	totalOperations()

Methods inherited from class java.lang.Object

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

Field Detail

generation

protected final long generation

channel

protected final FileChannel channel

path

protected final Path path

header

protected final org.elasticsearch.index.translog.TranslogHeader header

Constructor Detail

BaseTranslogReader

public BaseTranslogReader(long generation,
                          FileChannel channel,
                          Path path,
                          org.elasticsearch.index.translog.TranslogHeader header)

Method Detail

getGeneration

public long getGeneration()

sizeInBytes

public abstract long sizeInBytes()

totalOperations

public abstract int totalOperations()

getFirstOperationOffset

public final long getFirstOperationOffset()

getPrimaryTerm

public final long getPrimaryTerm()

Returns the primary term associated with this translog reader.

readSize

protected final int readSize(ByteBuffer reusableBuffer,
                             long position)
                      throws IOException

read the size of the op (i.e., number of bytes, including the op size) written at the given position

Throws:

IOException

newSnapshot

public org.elasticsearch.index.translog.TranslogSnapshot newSnapshot()

checksummedStream

protected final BufferedChecksumStreamInput checksummedStream(ByteBuffer reusableBuffer,
                                                              long position,
                                                              int opSize,
                                                              BufferedChecksumStreamInput reuse)
                                                       throws IOException

reads an operation at the given position and returns it. The buffer length is equal to the number of bytes reads.

Throws:

IOException

read

protected Translog.Operation read(BufferedChecksumStreamInput inStream)
                           throws IOException

Throws:

IOException

readBytes

protected abstract void readBytes(ByteBuffer buffer,
                                  long position)
                           throws IOException

reads bytes at position into the given buffer, filling it.

Throws:

IOException

toString

public String toString()

Overrides:

toString in class Object

compareTo

public int compareTo(BaseTranslogReader o)

Specified by:

compareTo in interface Comparable<BaseTranslogReader>

path

public Path path()

getLastModifiedTime

public long getLastModifiedTime()
                         throws IOException

Throws:

IOException