Package org.apache.lucene.search
Interface CollectorManager<C extends Collector,T>
- All Known Implementing Classes:
MultiCollectorManager
,TotalHitCountCollectorManager
public interface CollectorManager<C extends Collector,T>
A manager of collectors. This class is useful to parallelize execution of search requests and has
two main methods:
newCollector()
which must return a NEW collector which will be used to collect a certain set of leaves.reduce(Collection)
which will be used to reduce the results of individual collections into a meaningful result. This method is only called after all leaves have been fully collected.
- See Also:
- WARNING: This API is experimental and might change in incompatible ways in the next release.
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Method Summary
Modifier and TypeMethodDescriptionReturn a newCollector
.reduce
(Collection<C> collectors) Reduce the results of individual collectors into a meaningful result.
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Method Details
-
newCollector
Return a newCollector
. This must return a different instance on each call.- Throws:
IOException
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reduce
Reduce the results of individual collectors into a meaningful result. For instance aTopDocsCollector
would compute thetop docs
of each collector and then merge them usingTopDocs.merge(int, TopDocs[])
. This method must be called after collection is finished on all provided collectors.- Throws:
IOException
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