# Package org.optaplanner.core.impl.score.stream.drools.common

- Interface Summary
  Interface | Description
  --- | ---
  DroolsMetadata<LogicalFactType,GenuineFactType> | Represents a variable on the left-hand side of a rule.

- Class Summary
  Class | Description
  --- | ---
  DroolsAbstractConstraintStream<Solution_> |
  DroolsAccumulateContext<ResultContainer_> | Each context is uniquely identified by its `System.identityHashCode(Object)`.
  DroolsGenuineMetadata<A> |
  DroolsInferredMetadata<A> |
  DroolsLogicalTuple | Used inside Drools-based constraint stream implementation to implement grouping operations.

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