Package org.apache.lucene.util

Class IntBlockPool

java.lang.Object

org.apache.lucene.util.IntBlockPool

public final class IntBlockPool
extends Object

A pool for int blocks similar to ByteBlockPool

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	IntBlockPool.Allocator	Abstract class for allocating and freeing int blocks.
static class	IntBlockPool.DirectAllocator	A simple IntBlockPool.Allocator that never recycles.
static class	IntBlockPool.SliceReader	A IntBlockPool.SliceReader that can read int slices written by a IntBlockPool.SliceWriter
static class	IntBlockPool.SliceWriter	A IntBlockPool.SliceWriter that allows to write multiple integer slices into a given IntBlockPool.

Field Summary

Fields

Modifier and Type	Field	Description
int[]	buffer	Current head buffer
int[][]	buffers	array of buffers currently used in the pool.
static int	INT_BLOCK_MASK
static int	INT_BLOCK_SHIFT
static int	INT_BLOCK_SIZE
int	intOffset	Current head offset
int	intUpto	Pointer to the current position in head buffer

Constructor Summary

Constructors

Constructor	Description
IntBlockPool()	Creates a new IntBlockPool with a default IntBlockPool.Allocator.
IntBlockPool(IntBlockPool.Allocator allocator)	Creates a new IntBlockPool with the given IntBlockPool.Allocator.

Method Summary

Modifier and Type	Method	Description
void	nextBuffer()	Advances the pool to its next buffer.
void	reset()	Resets the pool to its initial state reusing the first buffer.
void	reset(boolean zeroFillBuffers, boolean reuseFirst)	Expert: Resets the pool to its initial state reusing the first buffer.

Methods inherited from class java.lang.Object

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

Field Detail

INT_BLOCK_SHIFT

public static final int INT_BLOCK_SHIFT

See Also:

Constant Field Values

INT_BLOCK_SIZE

public static final int INT_BLOCK_SIZE

See Also:

Constant Field Values

INT_BLOCK_MASK

public static final int INT_BLOCK_MASK

See Also:

Constant Field Values

buffers

public int[][] buffers

array of buffers currently used in the pool. Buffers are allocated if needed don't modify this outside of this class

intUpto

public int intUpto

Pointer to the current position in head buffer

buffer

public int[] buffer

Current head buffer

intOffset

public int intOffset

Current head offset

Constructor Detail

IntBlockPool

public IntBlockPool()

Creates a new IntBlockPool with a default IntBlockPool.Allocator.

See Also:

nextBuffer()

IntBlockPool

public IntBlockPool(IntBlockPool.Allocator allocator)

Creates a new IntBlockPool with the given IntBlockPool.Allocator.

See Also:

nextBuffer()

Method Detail

reset

public void reset()

Resets the pool to its initial state reusing the first buffer. Calling nextBuffer() is not needed after reset.

reset

public void reset(boolean zeroFillBuffers,
                  boolean reuseFirst)

Expert: Resets the pool to its initial state reusing the first buffer.

Parameters:

zeroFillBuffers - if true the buffers are filled with 0. This should be set to true if this pool is used with IntBlockPool.SliceWriter.

reuseFirst - if true the first buffer will be reused and calling nextBuffer() is not needed after reset iff the block pool was used before ie. nextBuffer() was called before.

nextBuffer

public void nextBuffer()

Advances the pool to its next buffer. This method should be called once after the constructor to initialize the pool. In contrast to the constructor a reset() call will advance the pool to its first buffer immediately.