edu.unh.sdb.datasource
Class BlockCache

java.lang.Object
  edu.unh.sdb.datasource.BlockCache

Direct Known Subclasses:

LRUCache, ThreadedSliceCache

public abstract class BlockCache
extends java.lang.Object

The BlockCache class is the parent class for all caches that store blocks of data in memory. Typically, these blocks are read from disk in order to achieve a speedup by reducing the total number of reads made to disk.

Field Summary

protected ISBounds	cacheBlockBounds
protected int[]	cacheBlockDimensions
protected int	dimensionality
protected ISBounds	dsSpaceBounds
protected int[]	dsSpaceDimensions
protected ISBounds	iterationSpaceBounds
protected int[]	iterationSpaceDimensions
protected int[]	lowerDSSpaceCoords
protected int[]	lowerIterationSpaceCoords
protected int	numAttributes
protected int	numCacheBlocks
protected int[]	partitioningDimensions
protected RegularISPartitioning	spacePartitioning
protected AxisOrdering	spacePartitioningOrdering
protected long[]	tagAxisWeights
protected PhysicalDataSource	theSource
protected int[]	upperDSSpaceCoords
protected int[]	upperIterationSpaceCoords

Method Summary

ISBounds	tagToBounds(long tag, ISBounds bounds) Return the bounds of the region in the index space corresponding to the given tag.
int[]	tagToPartitioningCoords(long tag, int[] pcoords)

Methods inherited from class java.lang.Object

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

Field Detail

cacheBlockBounds

protected ISBounds cacheBlockBounds

cacheBlockDimensions

protected int[] cacheBlockDimensions

spacePartitioning

protected RegularISPartitioning spacePartitioning

tagAxisWeights

protected long[] tagAxisWeights

spacePartitioningOrdering

protected AxisOrdering spacePartitioningOrdering

partitioningDimensions

protected int[] partitioningDimensions

numCacheBlocks

protected int numCacheBlocks

theSource

protected PhysicalDataSource theSource

dimensionality

protected int dimensionality

numAttributes

protected int numAttributes

iterationSpaceBounds

protected ISBounds iterationSpaceBounds

lowerIterationSpaceCoords

protected int[] lowerIterationSpaceCoords

upperIterationSpaceCoords

protected int[] upperIterationSpaceCoords

iterationSpaceDimensions

protected int[] iterationSpaceDimensions

dsSpaceBounds

protected ISBounds dsSpaceBounds

lowerDSSpaceCoords

protected int[] lowerDSSpaceCoords

upperDSSpaceCoords

protected int[] upperDSSpaceCoords

dsSpaceDimensions

protected int[] dsSpaceDimensions

Method Detail

tagToBounds

public final ISBounds tagToBounds(long tag,
                                  ISBounds bounds)

Return the bounds of the region in the index space corresponding to the given tag.

tagToPartitioningCoords

public final int[] tagToPartitioningCoords(long tag,
                                           int[] pcoords)