org.apache.directmemory.memory.allocator
Class FixedSizeByteBufferAllocatorImpl

java.lang.Object
  org.apache.directmemory.memory.allocator.AbstractByteBufferAllocator
      org.apache.directmemory.memory.allocator.FixedSizeByteBufferAllocatorImpl

All Implemented Interfaces:

Closeable, ByteBufferAllocator

public class FixedSizeByteBufferAllocatorImpl
extends AbstractByteBufferAllocator

ByteBufferAllocator implementation that instantiate ByteBuffers of fixed size, called slices.

Since:

0.6

Field Summary

Fields inherited from class org.apache.directmemory.memory.allocator.AbstractByteBufferAllocator

logger

Constructor Summary

FixedSizeByteBufferAllocatorImpl(int number, int totalSize, int sliceSize, int numberOfSegments)
Constructor.

Method Summary

ByteBuffer	allocate(int size) Allocates and returns a ByteBuffer with Buffer.limit() set to the given size.
void	clear() Clear all allocated ByteBuffer, resulting in a empty and ready to deserve ByteBufferAllocator
void	close()
protected ByteBuffer	findFreeBuffer(int capacity)
void	free(ByteBuffer byteBuffer) Returns the given ByteBuffer making it available for a future usage.
int	getCapacity()
int	getSliceSize()
protected void	init(int numberOfSegments)

Methods inherited from class org.apache.directmemory.memory.allocator.AbstractByteBufferAllocator

getHash, getLogger, getNumber, isClosed, setClosed

Methods inherited from class java.lang.Object

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

Constructor Detail

FixedSizeByteBufferAllocatorImpl

public FixedSizeByteBufferAllocatorImpl(int number,
                                        int totalSize,
                                        int sliceSize,
                                        int numberOfSegments)

Constructor.

Parameters:

number - : internal identifier of the allocator

totalSize - : the internal buffer

sliceSize - : arbitrary number of the buffer.

numberOfSegments - : number of parent ByteBuffer to allocate.

Method Detail

init

protected void init(int numberOfSegments)

findFreeBuffer

protected ByteBuffer findFreeBuffer(int capacity)

free

public void free(ByteBuffer byteBuffer)

Description copied from interface: ByteBufferAllocator

Returns the given ByteBuffer making it available for a future usage. Returning twice a ByteBuffer won't throw an exception.

Parameters:

byteBuffer - : the ByteBuffer to return

allocate

public ByteBuffer allocate(int size)

Description copied from interface: ByteBufferAllocator

Allocates and returns a ByteBuffer with Buffer.limit() set to the given size. When the allocation fails, it returns either null or throws an BufferOverflowException, depending on the implementation.

Parameters:

size - : the size in byte to allocate

Returns:

a ByteBuffer of the given size, or either return null or throw an BufferOverflowException when the allocation fails.

getSliceSize

public int getSliceSize()

clear

public void clear()

Description copied from interface: ByteBufferAllocator

Clear all allocated ByteBuffer, resulting in a empty and ready to deserve ByteBufferAllocator

getCapacity

public int getCapacity()

Returns:

the internal total size that can be allocated

close

public void close()