org.apache.lucene.index

Class OneMergeWrappingMergePolicy

java.lang.Object

org.apache.lucene.index.MergePolicy

org.apache.lucene.index.MergePolicyWrapper

org.apache.lucene.index.OneMergeWrappingMergePolicy

public class OneMergeWrappingMergePolicy
extends MergePolicyWrapper

A wrapping merge policy that wraps the MergePolicy.OneMerge objects returned by the wrapped merge policy.

WARNING: This API is experimental and might change in incompatible ways in the next release.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.lucene.index.MergePolicy

MergePolicy.MergeAbortedException, MergePolicy.MergeException, MergePolicy.MergeSpecification, MergePolicy.OneMerge, MergePolicy.OneMergeProgress

Field Summary

Fields inherited from class org.apache.lucene.index.MergePolicyWrapper

in

Fields inherited from class org.apache.lucene.index.MergePolicy

DEFAULT_MAX_CFS_SEGMENT_SIZE, DEFAULT_NO_CFS_RATIO, maxCFSSegmentSize, noCFSRatio

Constructor Summary

Constructors

Constructor and Description
OneMergeWrappingMergePolicy(MergePolicy in, UnaryOperator<MergePolicy.OneMerge> wrapOneMerge) Constructor

Method Summary

Modifier and Type	Method and Description
MergePolicy.MergeSpecification	findForcedDeletesMerges(SegmentInfos segmentInfos, IndexWriter writer) Determine what set of merge operations is necessary in order to expunge all deletes from the index.
MergePolicy.MergeSpecification	findForcedMerges(SegmentInfos segmentInfos, int maxSegmentCount, Map<SegmentCommitInfo,Boolean> segmentsToMerge, IndexWriter writer) Determine what set of merge operations is necessary in order to merge to <= the specified segment count.
MergePolicy.MergeSpecification	findMerges(MergeTrigger mergeTrigger, SegmentInfos segmentInfos, IndexWriter writer) Determine what set of merge operations are now necessary on the index.

Methods inherited from class org.apache.lucene.index.MergePolicyWrapper

getNoCFSRatio, setMaxCFSSegmentSizeMB, setNoCFSRatio, size, toString, useCompoundFile

Methods inherited from class org.apache.lucene.index.MergePolicy

getMaxCFSSegmentSizeMB, isMerged

Methods inherited from class java.lang.Object

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

Constructor Detail

OneMergeWrappingMergePolicy

public OneMergeWrappingMergePolicy(MergePolicy in,
                                   UnaryOperator<MergePolicy.OneMerge> wrapOneMerge)

Constructor

Parameters:

in - - the wrapped merge policy

wrapOneMerge - - operator for wrapping OneMerge objects

Method Detail

findMerges

public MergePolicy.MergeSpecification findMerges(MergeTrigger mergeTrigger,
                                                 SegmentInfos segmentInfos,
                                                 IndexWriter writer)
                                          throws IOException

Description copied from class: MergePolicy

Determine what set of merge operations are now necessary on the index. IndexWriter calls this whenever there is a change to the segments. This call is always synchronized on the IndexWriter instance so only one thread at a time will call this method.

Overrides:

findMerges in class MergePolicyWrapper

Parameters:

mergeTrigger - the event that triggered the merge

segmentInfos - the total set of segments in the index

writer - the IndexWriter to find the merges on

Throws:

IOException

findForcedMerges

public MergePolicy.MergeSpecification findForcedMerges(SegmentInfos segmentInfos,
                                                       int maxSegmentCount,
                                                       Map<SegmentCommitInfo,Boolean> segmentsToMerge,
                                                       IndexWriter writer)
                                                throws IOException

Description copied from class: MergePolicy

Determine what set of merge operations is necessary in order to merge to <= the specified segment count. IndexWriter calls this when its IndexWriter.forceMerge(int) method is called. This call is always synchronized on the IndexWriter instance so only one thread at a time will call this method.

Overrides:

findForcedMerges in class MergePolicyWrapper

Parameters:

segmentInfos - the total set of segments in the index

maxSegmentCount - requested maximum number of segments in the index (currently this is always 1)

segmentsToMerge - contains the specific SegmentInfo instances that must be merged away. This may be a subset of all SegmentInfos. If the value is True for a given SegmentInfo, that means this segment was an original segment present in the to-be-merged index; else, it was a segment produced by a cascaded merge.

writer - the IndexWriter to find the merges on

Throws:

IOException

findForcedDeletesMerges

public MergePolicy.MergeSpecification findForcedDeletesMerges(SegmentInfos segmentInfos,
                                                              IndexWriter writer)
                                                       throws IOException

Description copied from class: MergePolicy

Determine what set of merge operations is necessary in order to expunge all deletes from the index.

Overrides:

findForcedDeletesMerges in class MergePolicyWrapper

Parameters:

segmentInfos - the total set of segments in the index

writer - the IndexWriter to find the merges on

Throws:

IOException