Blog tag constraint

Constraint Streams - Modern Java constraints without the Drools Rule Language

Tue 7 April 2020

 Geoffrey De Smet

Traditionally, to scale out with OptaPlanner, you had to learn DRL. No more. With the new Constraints Streams API, inspired by Java 8 Streams and SQL, you can now write your constraints in Java (or Kotlin or Scala) and still benefit from incremental calculation. Underneath, Constraints Streams (CS) still use the powerful Drools engine. We also...

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Formula for measuring unfairness

Fri 3 February 2017

 Geoffrey De Smet

Load balancing is a common constraint for many OptaPlanner use cases. Especially when scheduling employees, the workload needs to be spread out fairly. Easier said than done. Let’s take a look at this challenging problem. For example, let’s assign 15 undesirable tasks to 5 employees. Each task takes a day, but they have different...

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