edu.unh.sdb.datasource
Class LRUCacheDataSource

java.lang.Object
  edu.unh.sdb.datasource.DataCollection
      edu.unh.sdb.datasource.DataSource
          edu.unh.sdb.datasource.CacheDataSource
              edu.unh.sdb.datasource.BlockCacheDataSource
                  edu.unh.sdb.datasource.LRUCacheDataSource

All Implemented Interfaces:

Indexable

public class LRUCacheDataSource
extends BlockCacheDataSource

The LRUCacheDataSource provides cache service for an underlying datasource.

Field Summary

protected int

numCacheBlocks

Fields inherited from class edu.unh.sdb.datasource.DataSource

fdlDescriptor, isActivated, name, wsName

Fields inherited from class edu.unh.sdb.datasource.DataCollection

attributeOrder, axisOrdering, axisWeights, bounds, dataOrder, dimensionality, numAttributes, pointOrder, recordDesc

Constructor Summary

LRUCacheDataSource(java.lang.String name, ChunkedDataSource ds, int numCacheBlocks)
Create a LRUCacheDataSource with a single CacheBlock connected to the ChunkedDataSource argument.

LRUCacheDataSource(java.lang.String name, DataSource ds, IndexSpaceID blockSizes, int numCacheBlocks)
Create a LRUCacheDataSource with a single CacheBlock connected to the DataSource argument.

Method Summary

void	activate() Calls activate() for the underlying datasource, and creates the actual cache, which allocates memory for the CacheBlocks.
static void	main(java.lang.String[] args) For debugging.
void	setIterationBounds(ISBounds bounds)

Methods inherited from class edu.unh.sdb.datasource.BlockCacheDataSource

getCacheBlockBounds, getCacheBlockBounds, getCacheBlockBounds, getCacheBlockBoundsIterator, getCacheBlockBoundsIterator, getCacheBlockDimensions, getCacheMemoryUsage

Methods inherited from class edu.unh.sdb.datasource.CacheDataSource

datum, datum, datum, deactivate, getIterationSpace, getSource, subblock, subblock

Methods inherited from class edu.unh.sdb.datasource.DataSource

checkActivated, clearCache, copyBestID, create, create, create, createRemote, createRemote, createRemoteClient, createRemoteClient, createRemoteDataSource, createRemoteDataSource, createRemoteDataSourceUDP, createRemoteUDP, createRemoteUDP, dumpData, equals, getName, getValues, isActivated, toString, toString

Methods inherited from class edu.unh.sdb.datasource.DataCollection

byteSize, computeOffset, computeOffset, copyBounds, createDataBlock, createDataBlock, createDataBlock, createDatum, createDatum, createDatum, createDatum, createDatum, createDatum, datum, datum, datum, datum, dim, getAxisOrdering, getAxisWeight, getAxisWeights, getBounds, getByte, getBytes, getBytes, getBytes, getBytes, getBytes, getBytes, getBytesByAttribute, getBytesByAttribute, getBytesByPoint, getBytesByPoint, getDataOrder, getDimensionsArray, getDouble, getDoubles, getDoubles, getDoubles, getDoubles, getDoubles, getDoubles, getDoublesByAttribute, getDoublesByAttribute, getDoublesByPoint, getDoublesByPoint, getFloat, getFloats, getFloats, getFloats, getFloats, getFloats, getFloats, getFloatsByAttribute, getFloatsByAttribute, getFloatsByPoint, getFloatsByPoint, getInt, getInts, getInts, getInts, getInts, getInts, getInts, getIntsByAttribute, getIntsByAttribute, getIntsByPoint, getIntsByPoint, getLowerBoundsArray, getNumAttributes, getRecordDescriptor, getShort, getShorts, getShorts, getShorts, getShorts, getShorts, getShorts, getShortsByAttribute, getShortsByAttribute, getShortsByPoint, getShortsByPoint, getStorageType, getValues, getValuesByAttribute, getValuesByPoint, longVolume, setAxisOrdering, setBounds, setRecordDescriptor, size, subblock, subblock, subblock, subblock, subblock, subblock, subblock, subblock, subblock, subblock, useBytesOnly, volume

Methods inherited from class java.lang.Object

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

Field Detail

numCacheBlocks

protected int numCacheBlocks

Constructor Detail

LRUCacheDataSource

public LRUCacheDataSource(java.lang.String name,
                          ChunkedDataSource ds,
                          int numCacheBlocks)

Create a LRUCacheDataSource with a single CacheBlock connected to the ChunkedDataSource argument. The CacheBlock dimensions match the datasource chunk size. The memory for the cache itself is not allocated until this datasource is activated.

LRUCacheDataSource

public LRUCacheDataSource(java.lang.String name,
                          DataSource ds,
                          IndexSpaceID blockSizes,
                          int numCacheBlocks)

Create a LRUCacheDataSource with a single CacheBlock connected to the DataSource argument. The CacheBlock dimensions are specified by the last argument. The memory for the cache itself is not allocated until this datasource is activated.

Method Detail

activate

public void activate()

Calls activate() for the underlying datasource, and creates the actual cache, which allocates memory for the CacheBlocks.

Overrides:

activate in class BlockCacheDataSource

setIterationBounds

public void setIterationBounds(ISBounds bounds)

main

public static void main(java.lang.String[] args)

For debugging. Runs basic tests on the LRUCacheDataSource class.