edu.unh.sdb.datasource
Class DynamicChunking

java.lang.Object
  edu.unh.sdb.datasource.DataCollection
      edu.unh.sdb.datasource.DataSource
          edu.unh.sdb.datasource.DynamicChunking

All Implemented Interfaces:

Indexable

public class DynamicChunking
extends DataSource

Abstract class for a dynamic chunking data source that provides a Indexable.datum(edu.unh.sdb.datasource.IndexSpaceID) method that either reads the datum from memory if the block that contained it is loaded, or loads the block, eventually discards an already loaded block in LRU fashion and then returns the data from the loaded block. Each time a block is accessed, it it moved at the begining of the LRU list.

Author:

dlipsa

Field Summary

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

DynamicChunking(DataSource dataSource)
Creates a new instance of DynamicChunking

Method Summary

void	activate() Activates the cache for the given memory and page size.
void	datum(Datum datum, IndexSpaceID dataId) Given an IndexSpaceID, copy the values of the Datum at that position to the argument Datum.
void	datum(Datum dtm, IndexSpaceID did, FieldIDMapper mp) not implemented
void	deactivate() Dealocate all resources used for the DynamicChunking but do not deactivate the original dataSource.
IndexSpaceID	getBlockDimensions()
DataSource	getDataSource()
java.util.Iterator	getIterator()
int	getMaxMemoryBlockCount()
long	getMemory()
java.lang.String	getStatistics()
protected ISBounds	pageToRead(IndexSpaceID _pageId)
void	setBlockDimensions(IndexSpaceID dimensions)
void	setMemory(long memory)
void	subblock(DataBlock dstBlock, ISBounds dstBounds, ISBounds srcBounds) Reads a subblock defined by srcBounds into the region of the Datablock argument defined by dstBounds.
void	subblock(DataBlock theBlock, ISBounds dstBounds, ISBounds srcBounds, FieldIDMapper mp) not implemented

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, main, 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, 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

Constructor Detail

DynamicChunking

public DynamicChunking(DataSource dataSource)

Creates a new instance of DynamicChunking

Method Detail

getDataSource

public DataSource getDataSource()

setMemory

public void setMemory(long memory)

getMemory

public long getMemory()

setBlockDimensions

public void setBlockDimensions(IndexSpaceID dimensions)

getBlockDimensions

public IndexSpaceID getBlockDimensions()

getStatistics

public java.lang.String getStatistics()

activate

public void activate()

Activates the cache for the given memory and page size. If the memory is 0, it frees any memory that was previously used, if any.

Overrides:

activate in class DataSource

deactivate

public void deactivate()

Dealocate all resources used for the DynamicChunking but do not deactivate the original dataSource.

Overrides:

deactivate in class DataSource

pageToRead

protected ISBounds pageToRead(IndexSpaceID _pageId)

getMaxMemoryBlockCount

public int getMaxMemoryBlockCount()

datum

public void datum(Datum datum,
                  IndexSpaceID dataId)

Description copied from class: DataCollection

Given an IndexSpaceID, copy the values of the Datum at that position to the argument Datum. TODO Define error conditions

Specified by:

datum in interface Indexable

Overrides:

datum in class DataCollection

datum

public void datum(Datum dtm,
                  IndexSpaceID did,
                  FieldIDMapper mp)

not implemented

Specified by:

datum in interface Indexable

Specified by:

datum in class DataCollection

subblock

public void subblock(DataBlock dstBlock,
                     ISBounds dstBounds,
                     ISBounds srcBounds)

Description copied from class: DataCollection

Reads a subblock defined by srcBounds into the region of the Datablock argument defined by dstBounds.

Specified by:

subblock in interface Indexable

Specified by:

subblock in class DataCollection

subblock

public void subblock(DataBlock theBlock,
                     ISBounds dstBounds,
                     ISBounds srcBounds,
                     FieldIDMapper mp)

not implemented

Specified by:

subblock in interface Indexable

Specified by:

subblock in class DataCollection

getIterator

public java.util.Iterator getIterator()