Package org.apache.lucene.monitor
Class ParallelMatcher<T extends QueryMatch>
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- org.apache.lucene.monitor.CandidateMatcher<T>
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- org.apache.lucene.monitor.ParallelMatcher<T>
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- Type Parameters:
T- the QueryMatch type returned
public class ParallelMatcher<T extends QueryMatch> extends CandidateMatcher<T>
Matcher class that runs matching queries in parallel.This class delegates the actual matching to separate CandidateMatcher classes, built from a passed in MatcherFactory.
Use this when individual queries can take a long time to run, and you want to minimize latency. The matcher distributes queries amongst its worker threads using a BlockingQueue, and synchronization overhead may affect performance if the individual queries are very fast.
- See Also:
PartitionMatcher
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Field Summary
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Fields inherited from class org.apache.lucene.monitor.CandidateMatcher
searcher
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Method Summary
All Methods Static Methods Instance Methods Concrete Methods Modifier and Type Method Description protected voiddoFinish()Called when all monitoring of a batch of documents is completestatic <T extends QueryMatch>
MatcherFactory<T>factory(ExecutorService executor, MatcherFactory<T> matcherFactory)Create a new MatcherFactory for a ParallelMatcherstatic <T extends QueryMatch>
MatcherFactory<T>factory(ExecutorService executor, MatcherFactory<T> matcherFactory, int threads)Create a new MatcherFactory for a ParallelMatcherprotected voidmatchQuery(String queryId, Query matchQuery, Map<String,String> metadata)Runs the supplied query against this CandidateMatcher's set of documents, storing any resulting match, and recording the query in the presearcher hitsTresolve(T match1, T match2)If two matches from the same query are found (for example, two branches of a disjunction), combine them.-
Methods inherited from class org.apache.lucene.monitor.CandidateMatcher
addMatch, copyMatches
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Method Detail
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matchQuery
protected void matchQuery(String queryId, Query matchQuery, Map<String,String> metadata) throws IOException
Description copied from class:CandidateMatcherRuns the supplied query against this CandidateMatcher's set of documents, storing any resulting match, and recording the query in the presearcher hits- Specified by:
matchQueryin classCandidateMatcher<T extends QueryMatch>- Parameters:
queryId- the query idmatchQuery- the query to runmetadata- the query metadata- Throws:
IOException- on IO errors
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resolve
public T resolve(T match1, T match2)
Description copied from class:CandidateMatcherIf two matches from the same query are found (for example, two branches of a disjunction), combine them.- Specified by:
resolvein classCandidateMatcher<T extends QueryMatch>- Parameters:
match1- the first match foundmatch2- the second match found- Returns:
- a Match object that combines the two
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doFinish
protected void doFinish()
Description copied from class:CandidateMatcherCalled when all monitoring of a batch of documents is complete- Overrides:
doFinishin classCandidateMatcher<T extends QueryMatch>
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factory
public static <T extends QueryMatch> MatcherFactory<T> factory(ExecutorService executor, MatcherFactory<T> matcherFactory, int threads)
Create a new MatcherFactory for a ParallelMatcher- Type Parameters:
T- the type of QueryMatch generated- Parameters:
executor- the ExecutorService to usematcherFactory- the MatcherFactory to use to create submatchersthreads- the number of threads to use
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factory
public static <T extends QueryMatch> MatcherFactory<T> factory(ExecutorService executor, MatcherFactory<T> matcherFactory)
Create a new MatcherFactory for a ParallelMatcherThis factory will create a ParallelMatcher that uses as many threads as there are cores available to the JVM (as determined by
Runtime.getRuntime().availableProcessors()).- Type Parameters:
T- the type of QueryMatch generated- Parameters:
executor- the ExecutorService to usematcherFactory- the MatcherFactory to use to create submatchers
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