Module org.apache.lucene.core

Package org.apache.lucene.index

Class CachingMergeContext

java.lang.Object

org.apache.lucene.index.CachingMergeContext

All Implemented Interfaces:

MergePolicy.MergeContext

class CachingMergeContext
extends Object
implements MergePolicy.MergeContext

a wrapper of IndexWriter MergeContext. Try to cache the numDeletesToMerge(SegmentCommitInfo) result in merge phase, to avoid duplicate calculation

Field Summary

Fields

Modifier and Type	Field	Description
(package private) final HashMap<SegmentCommitInfo,Integer>	cachedNumDeletesToMerge
(package private) final MergePolicy.MergeContext	mergeContext

Constructor Summary

Constructors

Constructor	Description
CachingMergeContext(MergePolicy.MergeContext mergeContext)

Method Summary

Modifier and Type	Method	Description
final InfoStream	getInfoStream()	Returns the info stream that can be used to log messages
final Set<SegmentCommitInfo>	getMergingSegments()	Returns an unmodifiable set of segments that are currently merging.
final int	numDeletedDocs(SegmentCommitInfo info)	Returns the number of deleted documents in the given segments.
final int	numDeletesToMerge(SegmentCommitInfo info)	Returns the number of deletes a merge would claim back if the given segment is merged.

Methods inherited from class java.lang.Object

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

Field Details

mergeContext

final MergePolicy.MergeContext mergeContext

cachedNumDeletesToMerge

final HashMap<SegmentCommitInfo,Integer> cachedNumDeletesToMerge

Constructor Details

CachingMergeContext

CachingMergeContext(MergePolicy.MergeContext mergeContext)

Method Details

numDeletesToMerge

public final int numDeletesToMerge(SegmentCommitInfo info)
                            throws IOException

Description copied from interface: MergePolicy.MergeContext

Returns the number of deletes a merge would claim back if the given segment is merged.

Specified by:

numDeletesToMerge in interface MergePolicy.MergeContext

Parameters:

info - the segment to get the number of deletes for

Throws:

IOException

See Also:

• MergePolicy.numDeletesToMerge(SegmentCommitInfo, int, org.apache.lucene.util.IOSupplier)

numDeletedDocs

public final int numDeletedDocs(SegmentCommitInfo info)

Description copied from interface: MergePolicy.MergeContext

Returns the number of deleted documents in the given segments.

Specified by:

numDeletedDocs in interface MergePolicy.MergeContext

getInfoStream

public final InfoStream getInfoStream()

Description copied from interface: MergePolicy.MergeContext

Returns the info stream that can be used to log messages

Specified by:

getInfoStream in interface MergePolicy.MergeContext

getMergingSegments

public final Set<SegmentCommitInfo> getMergingSegments()

Description copied from interface: MergePolicy.MergeContext

Returns an unmodifiable set of segments that are currently merging.

Specified by:

getMergingSegments in interface MergePolicy.MergeContext