# Package org.optaplanner.core.api.score.stream.bi

The `ConstraintStream` API for two matched facts.

See: Description

- Interface Summary
  Interface | Description
  --- | ---
  BiConstraintCollector<A,B,ResultContainer_,Result_> | Usually created with `ConstraintCollectors`.
  BiConstraintStream<A,B> | A `ConstraintStream` that matches two facts.
  BiJoiner<A,B> | Created with `Joiners`.

## Package org.optaplanner.core.api.score.stream.bi Description

The `ConstraintStream` API for two matched facts.

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