Package org.apache.lucene.util
Class IntBlockPool
- java.lang.Object
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- org.apache.lucene.util.IntBlockPool
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public final class IntBlockPool extends java.lang.Object
A pool for int blocks similar toByteBlockPool
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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 simpleIntBlockPool.Allocator
that never recycles.static class
IntBlockPool.SliceReader
AIntBlockPool.SliceReader
that can read int slices written by aIntBlockPool.SliceWriter
static class
IntBlockPool.SliceWriter
AIntBlockPool.SliceWriter
that allows to write multiple integer slices into a givenIntBlockPool
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Field Summary
Fields Modifier and Type Field Description private IntBlockPool.Allocator
allocator
int[]
buffer
Current head bufferint[][]
buffers
array of buffers currently used in the pool.private int
bufferUpto
index into the buffers array pointing to the current buffer used as the headprivate static int
FIRST_LEVEL_SIZE
The first level size for new slicesstatic int
INT_BLOCK_MASK
static int
INT_BLOCK_SHIFT
static int
INT_BLOCK_SIZE
int
intOffset
Current head offsetint
intUpto
Pointer to the current position in head bufferprivate static int[]
LEVEL_SIZE_ARRAY
An array holding the level sizes for int slices.private static int[]
NEXT_LEVEL_ARRAY
An array holding the offset into theLEVEL_SIZE_ARRAY
to quickly navigate to the next slice level.
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Constructor Summary
Constructors Constructor Description IntBlockPool()
Creates a newIntBlockPool
with a defaultIntBlockPool.Allocator
.IntBlockPool(IntBlockPool.Allocator allocator)
Creates a newIntBlockPool
with the givenIntBlockPool.Allocator
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Method Summary
All Methods Static Methods Instance Methods Concrete Methods Modifier and Type Method Description private int
allocSlice(int[] slice, int sliceOffset)
Allocates a new slice from the given offsetprivate static boolean
assertSliceBuffer(int[] buffer)
private int
newSlice(int size)
Creates a new int slice with the given starting size and returns the slices offset in the pool.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.
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Field Detail
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INT_BLOCK_SHIFT
public static final int INT_BLOCK_SHIFT
- See Also:
- Constant Field Values
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INT_BLOCK_SIZE
public static final int INT_BLOCK_SIZE
- See Also:
- Constant Field Values
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INT_BLOCK_MASK
public static final int INT_BLOCK_MASK
- See Also:
- Constant Field Values
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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
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bufferUpto
private int bufferUpto
index into the buffers array pointing to the current buffer used as the head
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intUpto
public int intUpto
Pointer to the current position in head buffer
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buffer
public int[] buffer
Current head buffer
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intOffset
public int intOffset
Current head offset
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allocator
private final IntBlockPool.Allocator allocator
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NEXT_LEVEL_ARRAY
private static final int[] NEXT_LEVEL_ARRAY
An array holding the offset into theLEVEL_SIZE_ARRAY
to quickly navigate to the next slice level.
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LEVEL_SIZE_ARRAY
private static final int[] LEVEL_SIZE_ARRAY
An array holding the level sizes for int slices.
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FIRST_LEVEL_SIZE
private static final int FIRST_LEVEL_SIZE
The first level size for new slices
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Constructor Detail
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IntBlockPool
public IntBlockPool()
Creates a newIntBlockPool
with a defaultIntBlockPool.Allocator
.- See Also:
nextBuffer()
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IntBlockPool
public IntBlockPool(IntBlockPool.Allocator allocator)
Creates a newIntBlockPool
with the givenIntBlockPool.Allocator
.- See Also:
nextBuffer()
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Method Detail
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reset
public void reset()
Resets the pool to its initial state reusing the first buffer. CallingnextBuffer()
is not needed after reset.
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reset
public void reset(boolean zeroFillBuffers, boolean reuseFirst)
Expert: Resets the pool to its initial state reusing the first buffer.- Parameters:
zeroFillBuffers
- iftrue
the buffers are filled with 0. This should be set totrue
if this pool is used withIntBlockPool.SliceWriter
.reuseFirst
- iftrue
the first buffer will be reused and callingnextBuffer()
is not needed after reset iff the block pool was used before ie.nextBuffer()
was called before.
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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 areset()
call will advance the pool to its first buffer immediately.
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newSlice
private int newSlice(int size)
Creates a new int slice with the given starting size and returns the slices offset in the pool.- See Also:
IntBlockPool.SliceReader
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assertSliceBuffer
private static boolean assertSliceBuffer(int[] buffer)
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allocSlice
private int allocSlice(int[] slice, int sliceOffset)
Allocates a new slice from the given offset
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