Notice: This Wiki is now read only and edits are no longer possible. Please see: https://gitlab.eclipse.org/eclipsefdn/helpdesk/-/wikis/Wiki-shutdown-plan for the plan.
VIATRA/Query/DeveloperDocumentation/QueryEngineArchitecture
Old information
The content from this page was migrated to the new, Github-based wiki system of VIATRA: https://github.com/eclipse-viatra/org.eclipse.viatra/wiki/VIATRA-Query-Engine-Internals
The content from this page was migrated to the new, Github-based wiki system of VIATRA: https://github.com/eclipse-viatra/org.eclipse.viatra/wiki/VIATRA-Query-Engine-Internals
VIATRA Query Engine Internals
Overview
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.