Package org.terrier.realtime.matching

Class IncrementalSelectiveMatching

java.lang.Object

org.terrier.realtime.matching.IncrementalSelectiveMatching

Direct Known Subclasses:

IncrementalSelectiveMostRecent

public class IncrementalSelectiveMatching
extends java.lang.Object

This class is used by the incremental indexer to do selective matching on a MultiIndex structure. The basic idea is that you specify a policy to determine which of the index shards actually get used for each specific query. This is useful because each shard can be seen as a subset of the documents indexed for a specific time, hence this class enables one to specify that I want to retrieve from only the last h hours of documents for example. What selective matching actually means will be dependent upon the flush policy that is selected, i.e. is the boundary for a shard based on time, number of documents, etc.

Since:

4.0

Author:

Richard McCreadie

Constructor Summary

Constructors

Constructor	Description
IncrementalSelectiveMatching()	Empty Constructor

Method Summary

Modifier and Type	Method	Description
static IncrementalSelectiveMatching	get(java.lang.String policy)	Get an new IncrementalSelectiveMatching policy object of the specified type.
java.util.List<Index>	getSelectedIndices(java.util.List<Index> indices)	Return all indices (default)

Methods inherited from class java.lang.Object

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

Constructor Detail

IncrementalSelectiveMatching

public IncrementalSelectiveMatching()

Empty Constructor

Method Detail

get

public static IncrementalSelectiveMatching get(java.lang.String policy)

Get an new IncrementalSelectiveMatching policy object of the specified type.

Parameters:

policy - a string describing the policy to be applied. "mostrecent" results in IncrementalSelectiveMostRecent

Returns:

IncrementalSelectiveMostRecent unless policy is "mostrecent"

getSelectedIndices

public java.util.List<Index> getSelectedIndices(java.util.List<Index> indices)

Return all indices (default)

Parameters:

indices - the list of indices to be filtered.

Returns:

all indices