org.jboss.netty.buffer

类 DirectChannelBufferFactory

java.lang.Object

org.jboss.netty.buffer.AbstractChannelBufferFactory

org.jboss.netty.buffer.DirectChannelBufferFactory

所有已实现的接口:

ChannelBufferFactory

public class DirectChannelBufferFactory
extends AbstractChannelBufferFactory

A ChannelBufferFactory which pre-allocates a large chunk of direct buffer and returns its slice on demand. Direct buffers are reclaimed via ReferenceQueue in most JDK implementations, and therefore they are deallocated less efficiently than an ordinary heap buffer. Consequently, a user will get OutOfMemoryError when one tries to allocate small direct buffers more often than the GC throughput of direct buffers, which is much lower than the GC throughput of heap buffers. This factory avoids this problem by allocating a large chunk of pre-allocated direct buffer and reducing the number of the garbage collected internal direct buffer objects.

构造器概要

构造器

构造器和说明
DirectChannelBufferFactory() Creates a new factory whose default ByteOrder is ByteOrder.BIG_ENDIAN.
DirectChannelBufferFactory(java.nio.ByteOrder defaultOrder) Creates a new factory with the specified default ByteOrder.
DirectChannelBufferFactory(java.nio.ByteOrder defaultOrder, int preallocatedBufferCapacity) Creates a new factory with the specified default ByteOrder.
DirectChannelBufferFactory(int preallocatedBufferCapacity) Creates a new factory whose default ByteOrder is ByteOrder.BIG_ENDIAN.

方法概要

方法

限定符和类型	方法和说明
ChannelBuffer	getBuffer(java.nio.ByteBuffer nioBuffer) Returns a ChannelBuffer whose content is equal to the sub-region of the specified nioBuffer.
ChannelBuffer	getBuffer(java.nio.ByteOrder order, byte[] array, int offset, int length) Returns a ChannelBuffer whose content is equal to the sub-region of the specified array.
ChannelBuffer	getBuffer(java.nio.ByteOrder order, int capacity) Returns a ChannelBuffer with the specified endianness and capacity.
static ChannelBufferFactory	getInstance()
static ChannelBufferFactory	getInstance(java.nio.ByteOrder defaultEndianness)

从类继承的方法 org.jboss.netty.buffer.AbstractChannelBufferFactory

getBuffer, getBuffer, getDefaultOrder

从类继承的方法 java.lang.Object

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

构造器详细资料

DirectChannelBufferFactory

public DirectChannelBufferFactory()

Creates a new factory whose default ByteOrder is ByteOrder.BIG_ENDIAN.

DirectChannelBufferFactory

public DirectChannelBufferFactory(int preallocatedBufferCapacity)

Creates a new factory whose default ByteOrder is ByteOrder.BIG_ENDIAN.

DirectChannelBufferFactory

public DirectChannelBufferFactory(java.nio.ByteOrder defaultOrder)

Creates a new factory with the specified default ByteOrder.

参数:

defaultOrder - the default ByteOrder of this factory

DirectChannelBufferFactory

public DirectChannelBufferFactory(java.nio.ByteOrder defaultOrder,
                          int preallocatedBufferCapacity)

Creates a new factory with the specified default ByteOrder.

参数:

defaultOrder - the default ByteOrder of this factory

方法详细资料

getInstance

public static ChannelBufferFactory getInstance()

getInstance

public static ChannelBufferFactory getInstance(java.nio.ByteOrder defaultEndianness)

getBuffer

public ChannelBuffer getBuffer(java.nio.ByteOrder order,
                      int capacity)

从接口复制的说明: ChannelBufferFactory

Returns a ChannelBuffer with the specified endianness and capacity.

参数:

order - the endianness of the returned ChannelBuffer

capacity - the capacity of the returned ChannelBuffer

返回:

a ChannelBuffer with the specified endianness and capacity, whose readerIndex and writerIndex are 0

getBuffer

public ChannelBuffer getBuffer(java.nio.ByteOrder order,
                      byte[] array,
                      int offset,
                      int length)

从接口复制的说明: ChannelBufferFactory

Returns a ChannelBuffer whose content is equal to the sub-region of the specified array. Depending on the factory implementation, the returned buffer could wrap the array or create a new copy of the array.

参数:

order - the endianness of the returned ChannelBuffer

array - the byte array

offset - the offset of the byte array

length - the length of the byte array

返回:

a ChannelBuffer with the specified content, whose readerIndex and writerIndex are 0 and (length - offset) respectively

getBuffer

public ChannelBuffer getBuffer(java.nio.ByteBuffer nioBuffer)

从接口复制的说明: ChannelBufferFactory

Returns a ChannelBuffer whose content is equal to the sub-region of the specified nioBuffer. Depending on the factory implementation, the returned buffer could wrap the nioBuffer or create a new copy of the nioBuffer.

参数:

nioBuffer - the NIO ByteBuffer

返回:

a ChannelBuffer with the specified content, whose readerIndex and writerIndex are 0 and nioBuffer.remaining() respectively