org.apache.directmemory.memory.allocator
Class SlabByteBufferAllocatorImpl

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

All Implemented Interfaces:

Closeable, ByteBufferAllocator

public class SlabByteBufferAllocatorImpl
extends AbstractByteBufferAllocator

ByteBufferAllocator implementation that uses FixedSizeByteBufferAllocatorImpl of different size to allocate best matching's size ByteBuffer

Since:

0.6

Field Summary

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

logger

Constructor Summary

SlabByteBufferAllocatorImpl(int number, Collection<FixedSizeByteBufferAllocatorImpl> slabs, boolean allowAllocationToBiggerSlab)
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()
void	free(ByteBuffer byteBuffer) Returns the given ByteBuffer making it available for a future usage.
int	getCapacity()

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

SlabByteBufferAllocatorImpl

public SlabByteBufferAllocatorImpl(int number,
                                   Collection<FixedSizeByteBufferAllocatorImpl> slabs,
                                   boolean allowAllocationToBiggerSlab)

Constructor.

Parameters:

number - : internal allocator identifier

slabs - : FixedSizeByteBufferAllocatorImpl to use for allocation

allowAllocationToBiggerSlab - : tells if it is allowed to look in a bigger slab to perform the request.

Method Detail

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.

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()
           throws IOException

Throws:

IOException