org.glassfish.grizzly.memory
Class DefaultMemoryManager

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

All Implemented Interfaces:

MemoryManager<ByteBufferWrapper>, WrapperAware<ByteBufferWrapper>

public class DefaultMemoryManager
extends ByteBufferViewManager

Default MemoryManager, used in Grizzly. DefaultMemory has simple Buffer pooling implementation, which makes released Buffer's memory to be reused.

Author:

Alexey Stashok

Nested Class Summary

class	DefaultMemoryManager.BufferInfo Information about thread associated memory pool.
class	DefaultMemoryManager.TrimAwareWrapper ByteBufferWrapper implementation, which supports triming.

Field Summary

static int

DEFAULT_MAX_BUFFER_SIZE

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

capacity, DEFAULT_CAPACITY, largeByteBuffer

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

isDirect

Constructor Summary

DefaultMemoryManager()

Method Summary

ByteBufferWrapper	allocate(int size) Allocates Buffer of required size.
int	getMaxThreadBufferSize() Get the maximum size of memory pool for one thread.
int	getReadyThreadBufferSize() Get the size of local thread memory pool.
long	getTotalBytesAllocated() Get real number of bytes allocated by this MemoryManager.
boolean	isMonitoring() Is monotoring enabled.
ByteBufferWrapper	reallocate(ByteBufferWrapper oldBuffer, int newSize) Reallocate Buffer to a required size.
void	release(ByteBufferWrapper buffer) Release Buffer.
void	setMaxThreadBufferSize(int maxThreadBufferSize) Set the maximum size of memory pool for one thread.
void	setMonitoring(boolean isMonitoring) Set monotoring mode.
ByteBufferWrapper	wrap(ByteBuffer byteBuffer) Returns Buffer, which wraps the ByteBuffer.

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

slice

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

allocate0, isDirect, setDirect, 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_MAX_BUFFER_SIZE

public static final int DEFAULT_MAX_BUFFER_SIZE

See Also:

Constant Field Values

Constructor Detail

DefaultMemoryManager

public DefaultMemoryManager()

Method Detail

getMaxThreadBufferSize

public int getMaxThreadBufferSize()

Get the maximum size of memory pool for one thread.

Returns:

the maximum size of memory pool for one thread.

setMaxThreadBufferSize

public void setMaxThreadBufferSize(int maxThreadBufferSize)

Set the maximum size of memory pool for one thread.

Parameters:

maxThreadBufferSize - the maximum size of memory pool for one thread.

isMonitoring

public boolean isMonitoring()

Is monotoring enabled.

Returns:

true, if monitoring is enabled, or false otherwise.

setMonitoring

public void setMonitoring(boolean isMonitoring)

Set monotoring mode.

Parameters:

isMonitoring - true, if monitoring is enabled, or false otherwise.

getTotalBytesAllocated

public long getTotalBytesAllocated()

Get real number of bytes allocated by this MemoryManager. It doesn't count bytes, which were pooled and then reused.

Returns:

real number of bytes allocated by this MemoryManager.

allocate

public ByteBufferWrapper allocate(int size)

Allocates Buffer of required size. First of all DefaultMemoryManager tries to reuse thread local memory pool. If it's not possible - it delegates allocation to ByteBufferViewManager.

Specified by:

allocate in interface MemoryManager<ByteBufferWrapper>

Overrides:

allocate in class ByteBufferViewManager

Parameters:

size - number of bytes to be allocated.

Returns:

allocated ByteBufferWrapper.

reallocate

public ByteBufferWrapper reallocate(ByteBufferWrapper oldBuffer,
                                    int newSize)

Reallocate Buffer to a required size. First of all DefaultMemoryManager tries to reuse thread local memory pool. If it's not possible - it delegates reallocation to ByteBufferViewManager.

Specified by:

reallocate in interface MemoryManager<ByteBufferWrapper>

Overrides:

reallocate in class ByteBufferViewManager

Parameters:

oldBuffer - old Buffer we want to reallocate.

newSize - Buffer required size.

Returns:

reallocated Buffer.

release

public void release(ByteBufferWrapper buffer)

Release Buffer. DefaultMemoryManager will checks if it's possible to return the buffer to thread local pool. If not - let's garbage collector utilize the memory.

Specified by:

release in interface MemoryManager<ByteBufferWrapper>

Overrides:

release in class ByteBufferManager

Parameters:

buffer - Buffer to be released.

getReadyThreadBufferSize

public int getReadyThreadBufferSize()

Get the size of local thread memory pool.

Returns:

the size of local thread memory pool.

wrap

public ByteBufferWrapper wrap(ByteBuffer byteBuffer)

Description copied from class: ByteBufferManager

Returns Buffer, which wraps the ByteBuffer.

Specified by:

wrap in interface WrapperAware<ByteBufferWrapper>

Overrides:

wrap in class ByteBufferManager

Parameters:

byteBuffer - ByteBuffer to wrap

Returns:

Buffer wrapper on top of passed ByteBuffer.