org.apache.cassandra.io.util

Class DataOutputBuffer

java.lang.Object

java.io.OutputStream

org.apache.cassandra.io.util.DataOutputStreamPlus

org.apache.cassandra.io.util.BufferedDataOutputStreamPlus

org.apache.cassandra.io.util.DataOutputBuffer

All Implemented Interfaces:

java.io.Closeable, java.io.DataOutput, java.io.Flushable, java.lang.AutoCloseable, DataOutputPlus

Direct Known Subclasses:

DataOutputBufferFixed, SafeMemoryWriter

public class DataOutputBuffer
extends BufferedDataOutputStreamPlus

An implementation of the DataOutputStream interface using a FastByteArrayOutputStream and exposing its buffer so copies can be avoided. This class is completely thread unsafe.

Field Summary

Fields

Modifier and Type	Field and Description
static io.netty.util.concurrent.FastThreadLocal<DataOutputBuffer>	scratchBuffer Scratch buffers used mostly for serializing in memory.

Fields inherited from class org.apache.cassandra.io.util.BufferedDataOutputStreamPlus

buffer

Fields inherited from class org.apache.cassandra.io.util.DataOutputStreamPlus

channel

Constructor Summary

Constructors

Constructor and Description
DataOutputBuffer()
DataOutputBuffer(java.nio.ByteBuffer buffer)
DataOutputBuffer(int size)

Method Summary

Modifier and Type	Method and Description
java.nio.ByteBuffer	asNewBuffer()
java.nio.ByteBuffer	buffer()
java.nio.ByteBuffer	buffer(boolean duplicate)
void	clear()
void	close()
protected void	doFlush(int count)
protected void	expandToFit(long count)
void	flush()
byte[]	getData()
int	getLength()
boolean	hasPosition() If the implementation supports providing a position, this method returns true, otherwise false.
protected java.nio.channels.WritableByteChannel	newDefaultChannel()
long	position() Returns the current position of the underlying target like a file-pointer or the position withing a buffer.
byte[]	toByteArray()

Methods inherited from class org.apache.cassandra.io.util.BufferedDataOutputStreamPlus

order, write, write, write, write, writeBoolean, writeByte, writeBytes, writeChar, writeChars, writeDouble, writeFloat, writeInt, writeLong, writeShort, writeUTF

Methods inherited from class org.apache.cassandra.io.util.DataOutputStreamPlus

retrieveTemporaryBuffer

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.cassandra.io.util.DataOutputPlus

write, writeUnsignedVInt, writeVInt

Field Detail

scratchBuffer

public static final io.netty.util.concurrent.FastThreadLocal<DataOutputBuffer> scratchBuffer

Scratch buffers used mostly for serializing in memory. It's important to call #recycle() when finished to keep the memory overhead from being too large in the system.

Constructor Detail

DataOutputBuffer

public DataOutputBuffer()

DataOutputBuffer

public DataOutputBuffer(int size)

DataOutputBuffer

public DataOutputBuffer(java.nio.ByteBuffer buffer)

Method Detail

flush

public void flush()

Specified by:

flush in interface java.io.Flushable

Overrides:

flush in class BufferedDataOutputStreamPlus

doFlush

protected void doFlush(int count)
                throws java.io.IOException

Overrides:

doFlush in class BufferedDataOutputStreamPlus

Throws:

java.io.IOException

expandToFit

protected void expandToFit(long count)

newDefaultChannel

protected java.nio.channels.WritableByteChannel newDefaultChannel()

Overrides:

newDefaultChannel in class DataOutputStreamPlus

clear

public void clear()

close

public void close()

Specified by:

close in interface java.io.Closeable

Specified by:

close in interface java.lang.AutoCloseable

Overrides:

close in class BufferedDataOutputStreamPlus

buffer

public java.nio.ByteBuffer buffer()

buffer

public java.nio.ByteBuffer buffer(boolean duplicate)

getData

public byte[] getData()

getLength

public int getLength()

hasPosition

public boolean hasPosition()

Description copied from interface: DataOutputPlus

If the implementation supports providing a position, this method returns true, otherwise false.

position

public long position()

Description copied from interface: DataOutputPlus

Returns the current position of the underlying target like a file-pointer or the position withing a buffer. Not every implementation may support this functionality. Whether or not this functionality is supported can be checked via the DataOutputPlus.hasPosition().

asNewBuffer

public java.nio.ByteBuffer asNewBuffer()

toByteArray

public byte[] toByteArray()