org.eclipse.incquery.runtime.matchers.context

Interface IQueryCacheContext

All Known Implementing Classes:

IncQueryEngineImpl

public interface IQueryCacheContext

Provides information on already cached queries to query evaluator backends at runtime.

Author:

Bergmann Gabor

Method Summary

Modifier and Type	Method and Description
IQueryResultProvider	getCachingResultProvider(PQuery query) Returns a caching result provider for the given query; it must be constructed if it does not exist yet.
boolean	isResultCached(PQuery query) Checks if there already is a caching result provider for the given query.

Method Detail

isResultCached

boolean isResultCached(PQuery query)

Checks if there already is a caching result provider for the given query.

Returns false if called while the caching result provider of the given query is being constructed in the first place.

getCachingResultProvider

IQueryResultProvider getCachingResultProvider(PQuery query)
                                       throws QueryProcessingException

Returns a caching result provider for the given query; it must be constructed if it does not exist yet.

Caution: behavior undefined if called while the caching result provider of the given query is being constructed. Beware of infinite loops.

Postcondition: IQueryBackend.isCaching() returns true for the #getQueryBackend() of the returned provider

Throws:

QueryProcessingException