com.bigdata.btree.proc
Class BatchLookup

java.lang.Object
  com.bigdata.btree.proc.AbstractIndexProcedure
      com.bigdata.btree.proc.AbstractKeyArrayIndexProcedure
          com.bigdata.btree.proc.BatchLookup

All Implemented Interfaces:

IIndexProcedure, IKeyArrayIndexProcedure, IParallelizableIndexProcedure, Externalizable, Serializable

public class BatchLookup
extends AbstractKeyArrayIndexProcedure
implements IParallelizableIndexProcedure

Batch lookup operation.

Version:

$Id: BatchLookup.java 2265 2009-10-26 12:51:06Z thompsonbry $

Author:

Bryan Thompson

See Also:

Serialized Form

Nested Class Summary

static class

BatchLookup.BatchLookupConstructor Factory for BatchLookup procedures.

Nested classes/interfaces inherited from class com.bigdata.btree.proc.AbstractKeyArrayIndexProcedure

AbstractKeyArrayIndexProcedure.ResultBitBuffer, AbstractKeyArrayIndexProcedure.ResultBitBufferCounter, AbstractKeyArrayIndexProcedure.ResultBitBufferHandler, AbstractKeyArrayIndexProcedure.ResultBuffer, AbstractKeyArrayIndexProcedure.ResultBufferHandler

Field Summary

Fields inherited from class com.bigdata.btree.proc.AbstractKeyArrayIndexProcedure

DEBUG, log

Constructor Summary

	BatchLookup() De-serialization ctor.
protected	BatchLookup(IRabaCoder keysCoder, IRabaCoder valsCoder, int fromIndex, int toIndex, byte[][] keys) Create a batch lookup operation.

Method Summary

Object	apply(IIndex ndx) Run the procedure.
boolean	isReadOnly() Return true iff the procedure asserts that it will not write on the index.

Methods inherited from class com.bigdata.btree.proc.AbstractKeyArrayIndexProcedure

getKey, getKeyCount, getKeys, getValue, getValues, readExternal, readMetadata, writeExternal, writeMetadata

Methods inherited from class com.bigdata.btree.proc.AbstractIndexProcedure

getKeyBuilder

Methods inherited from class java.lang.Object

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

Constructor Detail

BatchLookup

public BatchLookup()

De-serialization ctor.

BatchLookup

protected BatchLookup(IRabaCoder keysCoder,
                      IRabaCoder valsCoder,
                      int fromIndex,
                      int toIndex,
                      byte[][] keys)

Create a batch lookup operation.

Parameters:

keys - The array of keys (one key per tuple).

See Also:

BatchLookup.BatchLookupConstructor

Method Detail

isReadOnly

public final boolean isReadOnly()

Description copied from interface: IIndexProcedure

Return true iff the procedure asserts that it will not write on the index. When true, the procedure may be run against a view of the index that is read-only or which allows concurrent processes to read on the same index object. When false the procedure will be run against a mutable view of the index (assuming that the procedure is executed in a context that has access to a mutable index view).

Specified by:

isReadOnly in interface IIndexProcedure

apply

public Object apply(IIndex ndx)

Description copied from interface: IIndexProcedure

Run the procedure.

Note: Unisolated procedures have "auto-commit" ACID properties for a local index only. In order for a distributed procedure to be ACID, the procedure MUST be executed within a fully isolated transaction.

Specified by:

apply in interface IIndexProcedure

Parameters:

ndx - The index.

Returns:

ResultBuffer