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VIATRA/Query/DeveloperDocumentation/QueryEngineArchitecture

VIATRA Query Engine Internals

Overview

IncQueryEngine.png

Most important concepts

  • ViatraQueryEngine: the central element of the API.
  • QueryScope: the set of model elements the ViatraQueryEngine should work on.
    • The project itself implements only EMFScope right now.
  • IQueryRuntimeContext: wrapper class for the query backends to access the model. The access can be both indexed and non-indexed.
  • IQueryBackend: an executor of graph pattern matches; it instantiates IQueryResultProviders. Query Backends needs to be registered to the ViatraQueryEngine itself.
    • RetePatternMatcher is the fully incremental implementation of the IQueryResultProvider interface.
    • LocalSearchResultProvider is a local search based implementation of the IQueryResultProvider interface.
  • The ViatraQueryMatcher interface is the public matcher API: generated instances are type-safe.

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