Interface IQueryBackendFactory
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- All Known Implementing Classes:
DRedReteBackendFactory
,LocalSearchEMFBackendFactory
,LocalSearchGenericBackendFactory
,ReteBackendFactory
,TimelyReteBackendFactory
public interface IQueryBackendFactory
A Query Backend Factory identifies a query evaluator implementation, and can create an evaluator instance (anIQueryBackend
) tied to a specific VIATRA Query engine upon request.The factory is used as a lookup key for the backend instance, therefore implementors should either be singletons, or implement equals() / hashCode() accordingly.
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Method Summary
All Methods Instance Methods Abstract Methods Modifier and Type Method Description IMatcherCapability
calculateRequiredCapability(PQuery query, QueryEvaluationHint hint)
Calculate the required capabilities, which are needed to execute the given patternIQueryBackend
create(IQueryBackendContext context)
Creates a newIQueryBackend
instance tied to the given context elements.java.lang.Class<? extends IQueryBackend>
getBackendClass()
The backend instances created by this factory are guaranteed to conform to the returned class.boolean
isCaching()
Returns whether the current backend is caching
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Method Detail
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create
IQueryBackend create(IQueryBackendContext context)
Creates a newIQueryBackend
instance tied to the given context elements.- Returns:
- an instance of the class returned by
getBackendClass()
that operates in the given context. - Since:
- 1.5
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getBackendClass
java.lang.Class<? extends IQueryBackend> getBackendClass()
The backend instances created by this factory are guaranteed to conform to the returned class.
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calculateRequiredCapability
IMatcherCapability calculateRequiredCapability(PQuery query, QueryEvaluationHint hint)
Calculate the required capabilities, which are needed to execute the given pattern- Since:
- 1.4
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isCaching
boolean isCaching()
Returns whether the current backend is caching- Since:
- 2.0
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