Package org.apache.bookkeeper.bookie

Class BufferedReadChannel

java.lang.Object

org.apache.bookkeeper.bookie.BufferedChannelBase

org.apache.bookkeeper.bookie.BufferedReadChannel

Direct Known Subclasses:

BufferedChannel

public class BufferedReadChannel
extends BufferedChannelBase

A Buffered channel without a write buffer. Only reads are buffered.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.bookkeeper.bookie.BufferedChannelBase

BufferedChannelBase.BufferedChannelClosedException

Field Summary

Fields

Modifier and Type	Field	Description
(package private) long	cacheHitCount
(package private) long	invocationCount
protected io.netty.buffer.ByteBuf	readBuffer
protected long	readBufferStartPosition
protected int	readCapacity
(package private) boolean	sealed

Fields inherited from class org.apache.bookkeeper.bookie.BufferedChannelBase

fileChannel

Constructor Summary

Constructors

Constructor	Description
BufferedReadChannel(java.nio.channels.FileChannel fileChannel, int readCapacity)
BufferedReadChannel(java.nio.channels.FileChannel fileChannel, int readCapacity, boolean sealed)

Method Summary

Modifier and Type	Method	Description
void	clear()
int	read(io.netty.buffer.ByteBuf dest, long pos)	Read as many bytes into dest as dest.capacity() starting at position pos in the FileChannel.
int	read(io.netty.buffer.ByteBuf dest, long pos, int length)
long	size()	Get the current size of the underlying FileChannel.

Methods inherited from class org.apache.bookkeeper.bookie.BufferedChannelBase

validateAndGetFileChannel

Methods inherited from class java.lang.Object

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

Field Detail

readCapacity

protected final int readCapacity

readBuffer

protected final io.netty.buffer.ByteBuf readBuffer

readBufferStartPosition

protected long readBufferStartPosition

invocationCount

long invocationCount

cacheHitCount

long cacheHitCount

sealed

final boolean sealed

Constructor Detail

BufferedReadChannel

public BufferedReadChannel(java.nio.channels.FileChannel fileChannel,
                           int readCapacity)

BufferedReadChannel

public BufferedReadChannel(java.nio.channels.FileChannel fileChannel,
                           int readCapacity,
                           boolean sealed)

Method Detail

read

public int read(io.netty.buffer.ByteBuf dest,
                long pos)
         throws java.io.IOException

Read as many bytes into dest as dest.capacity() starting at position pos in the FileChannel. This function can read from the buffer or the file channel depending on the implementation..

Parameters:

dest -

pos -

Returns:

The total number of bytes read. -1 if the given position is greater than or equal to the file's current size.

Throws:

java.io.IOException - if I/O error occurs

size

public long size()
          throws java.io.IOException

Description copied from class: BufferedChannelBase

Get the current size of the underlying FileChannel.

Overrides:

size in class BufferedChannelBase

Returns:

Throws:

java.io.IOException

read

public int read(io.netty.buffer.ByteBuf dest,
                long pos,
                int length)
         throws java.io.IOException

Throws:

java.io.IOException

clear

public void clear()