io.undertow.server.handlers.cache

Class LimitedBufferSlicePool

java.lang.Object

io.undertow.server.handlers.cache.LimitedBufferSlicePool

public final class LimitedBufferSlicePool
extends Object

A limited buffer pooled allocator. This pool uses a series of buffer regions to back the returned pooled buffers. When the buffer is no longer needed, it should be freed back into the pool; failure to do so will cause the corresponding buffer area to be unavailable until the buffer is garbage-collected.

Author:

David M. Lloyd, Jason T. Greene

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	LimitedBufferSlicePool.PooledByteBuffer

Constructor Summary

Constructors

Constructor and Description
LimitedBufferSlicePool(BufferAllocator<ByteBuffer> allocator, int bufferSize, int maxRegionSize) Construct a new instance.
LimitedBufferSlicePool(BufferAllocator<ByteBuffer> allocator, int bufferSize, int maxRegionSize, int maxRegions) Construct a new instance.
LimitedBufferSlicePool(int bufferSize, int maxRegionSize) Construct a new instance, using a direct buffer allocator.

Method Summary

Modifier and Type	Method and Description
LimitedBufferSlicePool.PooledByteBuffer	allocate() Allocates a new byte buffer if possible
boolean	canAllocate(int slices)

Methods inherited from class java.lang.Object

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

Constructor Detail

LimitedBufferSlicePool

public LimitedBufferSlicePool(BufferAllocator<ByteBuffer> allocator,
                              int bufferSize,
                              int maxRegionSize,
                              int maxRegions)

Construct a new instance.

Parameters:

allocator - the buffer allocator to use

bufferSize - the size of each buffer

maxRegionSize - the maximum region size for each backing buffer

maxRegions - the maximum regions to create, zero for unlimited

LimitedBufferSlicePool

public LimitedBufferSlicePool(BufferAllocator<ByteBuffer> allocator,
                              int bufferSize,
                              int maxRegionSize)

Construct a new instance.

Parameters:

allocator - the buffer allocator to use

bufferSize - the size of each buffer

maxRegionSize - the maximum region size for each backing buffer

LimitedBufferSlicePool

public LimitedBufferSlicePool(int bufferSize,
                              int maxRegionSize)

Construct a new instance, using a direct buffer allocator.

Parameters:

bufferSize - the size of each buffer

maxRegionSize - the maximum region size for each backing buffer

Method Detail

allocate

public LimitedBufferSlicePool.PooledByteBuffer allocate()

Allocates a new byte buffer if possible

Returns:

new buffer or null if none available

canAllocate

public boolean canAllocate(int slices)