org.glassfish.grizzly.memory
Class ByteBufferViewManager

java.lang.Object
  org.glassfish.grizzly.memory.ByteBufferManager
      org.glassfish.grizzly.memory.ByteBufferViewManager

All Implemented Interfaces:

MemoryManager<ByteBufferWrapper>, WrapperAware<ByteBufferWrapper>

Direct Known Subclasses:

DefaultMemoryManager

public class ByteBufferViewManager
extends ByteBufferManager

The ByteBufferManager implementation, which doesn't allocate ByteBuffers each time allocate is called. Instead of this, implementation preallocates large ByteBuffer pool, and returns ByteBuffer view of required size for each allocate method call.

Author:

Jean-Francois Arcand, Alexey Stashok

See Also:

MemoryManager, ByteBufferManager, ByteBuffer

Field Summary

protected int	capacity Capacity of the large ByteBuffer pool.
static int	DEFAULT_CAPACITY The default capacity of the ByteBuffer from which views will be created.
protected ByteBuffer	largeByteBuffer Large ByteBuffer pool.

Fields inherited from class org.glassfish.grizzly.memory.ByteBufferManager

isDirect

Constructor Summary

ByteBufferViewManager()

ByteBufferViewManager(boolean isDirect)

ByteBufferViewManager(boolean isDirect, int capacity)

Method Summary

ByteBufferWrapper	allocate(int size) Allocates Buffer of required size, which is actually sliced from large preallocated ByteBuffer pool.
ByteBufferWrapper	reallocate(ByteBufferWrapper oldBuffer, int newSize) Reallocate Buffer to a required size.
protected static ByteBuffer	slice(ByteBuffer chunk, int size) Slice ByteBuffer of required size from big chunk.

Methods inherited from class org.glassfish.grizzly.memory.ByteBufferManager

allocate0, isDirect, release, setDirect, wrap, wrap, wrap, wrap, wrap

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_CAPACITY

public static final int DEFAULT_CAPACITY

The default capacity of the ByteBuffer from which views will be created.

See Also:

Constant Field Values

largeByteBuffer

protected ByteBuffer largeByteBuffer

Large ByteBuffer pool.

capacity

protected int capacity

Capacity of the large ByteBuffer pool.

Constructor Detail

ByteBufferViewManager

public ByteBufferViewManager()

ByteBufferViewManager

public ByteBufferViewManager(boolean isDirect)

ByteBufferViewManager

public ByteBufferViewManager(boolean isDirect,
                             int capacity)

Method Detail

allocate

public ByteBufferWrapper allocate(int size)

Allocates Buffer of required size, which is actually sliced from large preallocated ByteBuffer pool.

Specified by:

allocate in interface MemoryManager<ByteBufferWrapper>

Overrides:

allocate in class ByteBufferManager

Parameters:

size - size of the Buffer to be allocated.

Returns:

Buffer of required size, which is actualled sliced from large preallocated ByteBuffer pool.

reallocate

public ByteBufferWrapper reallocate(ByteBufferWrapper oldBuffer,
                                    int newSize)

Reallocate Buffer to a required size. Implementation may choose the way, how reallocation could be done, either by allocating new Buffer of required size and copying old Buffer content there, or perform more complex logic related to memory pooling etc.

Specified by:

reallocate in interface MemoryManager<ByteBufferWrapper>

Overrides:

reallocate in class ByteBufferManager

Parameters:

oldBuffer - old Buffer to be reallocated.

newSize - new Buffer required size.

Returns:

reallocated Buffer.

slice

protected static ByteBuffer slice(ByteBuffer chunk,
                                  int size)

Slice ByteBuffer of required size from big chunk.

Parameters:

chunk - big ByteBuffer pool.

size - required slice size.

Returns:

sliced ByteBuffer of required size.