org.glassfish.grizzly.memory.slab
Class SlabMemoryManagerFactory

java.lang.Object
  org.glassfish.grizzly.memory.slab.SlabMemoryManagerFactory

public class SlabMemoryManagerFactory
extends Object

Factory for Allocators (pooled and non-pooled) and SlabPools.

Author:

Ken Cavanaugh

Nested Class Summary

static interface

SlabMemoryManagerFactory.SlabPool Obtain useful statistics about the SlabPool.

Field Summary

static boolean	DEFAULT_BYTE_BUFFER_TYPE
static long	DEFAULT_POOL_MAX_SIZE Default max size of which the pool my grow to
static long	DEFAULT_POOL_MIN_SIZE The default minimum size of the pool in bytes.
static int	DEFAULT_SLAB_SIZE The default maximum size that can be satisfied by a call to Allocator.allocate().

Method Summary

static MemoryManager	makeAllocator()
static MemoryManager	makeAllocator(int allocatorSize, boolean bufferType) Return an Allocator that allocates from one slab at a time, creating a new slab as needed.
static SlabMemoryManagerFactory.SlabPool	makeDefaultSlabPool() Get a SlabPool with defaults
static MemoryManager	makePoolAllocator(SlabMemoryManagerFactory.SlabPool pool) Create an Allocator that allocates from a pool of slabs.
static SlabMemoryManagerFactory.SlabPool	makeSlabPool(int maxAllocationSize, long minSize, long maxSize, boolean bufferType) Create a SlabPool from which Allocators may be created.

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_SLAB_SIZE

public static final int DEFAULT_SLAB_SIZE

The default maximum size that can be satisfied by a call to Allocator.allocate().

See Also:

Constant Field Values

DEFAULT_POOL_MAX_SIZE

public static final long DEFAULT_POOL_MAX_SIZE

Default max size of which the pool my grow to

See Also:

Constant Field Values

DEFAULT_POOL_MIN_SIZE

public static final long DEFAULT_POOL_MIN_SIZE

The default minimum size of the pool in bytes.

See Also:

Constant Field Values

DEFAULT_BYTE_BUFFER_TYPE

public static final boolean DEFAULT_BYTE_BUFFER_TYPE

See Also:

Constant Field Values

Method Detail

makeAllocator

public static MemoryManager makeAllocator(int allocatorSize,
                                          boolean bufferType)

Return an Allocator that allocates from one slab at a time, creating a new slab as needed. Space is recovered by the garbage collector. This version will create a new slab allocator when available space is exhausted. It will only return null if an attempt is made to allocate a BufferWrapper larger than allocatorSize - headerSize bytes. trim is supported, but only for the last BufferWrapper returned from an allocate call.

Parameters:

allocatorSize - The total size available for all allocate calls in a single Allocator.

bufferType - The buffer type of the slabs created for this allocator.

Returns:

MemoryManager

makeAllocator

public static MemoryManager makeAllocator()

makePoolAllocator

public static MemoryManager makePoolAllocator(SlabMemoryManagerFactory.SlabPool pool)

Create an Allocator that allocates from a pool of slabs. All space is managed by the Slabs and SlabPool, and Slabs are recycled once they have been completely freed.

Parameters:

pool - The SlabPool to use for Slabs for this Allocator.

Returns:

MemoryManager

makeSlabPool

public static SlabMemoryManagerFactory.SlabPool makeSlabPool(int maxAllocationSize,
                                                             long minSize,
                                                             long maxSize,
                                                             boolean bufferType)

Create a SlabPool from which Allocators may be created.

Parameters:

maxAllocationSize - The maximum size that can be satisfied by a call to Allocator.allocate().

minSize - The minimum size of the pool in bytes.

maxSize - The maximum size to which a pool may grow.

bufferType - The buffer type used in this pool.

makeDefaultSlabPool

public static SlabMemoryManagerFactory.SlabPool makeDefaultSlabPool()

Get a SlabPool with defaults

Returns: