Package org.apache.lucene.util

Class IntBlockPool

java.lang.Object

org.apache.lucene.util.IntBlockPool

public class IntBlockPool
extends Object

A pool for int blocks similar to ByteBlockPool

NOTE: This API is for internal purposes only and might change in incompatible ways in the next release.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	IntBlockPool.Allocator	Abstract class for allocating and freeing int blocks.
static final class	IntBlockPool.DirectAllocator	A simple IntBlockPool.Allocator that never recycles.

Field Summary

Fields

Modifier and Type	Field	Description
int[]	buffer	Current head buffer
int[][]	buffers	array of buffers currently used in the pool.
static final int	INT_BLOCK_MASK
static final int	INT_BLOCK_SHIFT
static final 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(boolean zeroFillBuffers, boolean reuseFirst)	Expert: Resets the pool to its initial state, while optionally reusing the first buffer.

Methods inherited from class java.lang.Object

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

Field Details

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 Details

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 Details

reset

public void reset(boolean zeroFillBuffers,
 boolean reuseFirst)

Expert: Resets the pool to its initial state, while optionally reusing the first buffer. Buffers that are not reused are reclaimed by ByteBlockPool.Allocator.recycleByteBlocks(byte[][], int, int). Buffers can be filled with zeros before recycling them. This is useful if a slice pool works on top of this int pool and relies on the buffers being filled with zeros to find the non-zero end of slices.

Parameters:

zeroFillBuffers - if true the buffers are filled with 0.

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(boolean, boolean) call will advance the pool to its first buffer immediately.