Blog tag coding

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...

Exploring the new OptaWeb Employee Rostering backend

Tue 22 October 2019

Julian Cui

To help you solve employee shift rostering challenges, we maintain an end-to-end web application called OptaWeb Employee Rostering. It is a web application that optimizes shift scheduling for maximum efficiency and fairness for employees. Scheduling guards is very different from scheduling nurses, therefore you can fork and customize the code to your requirements. Recently,...

Mechanic scheduling (part 2) - Architecture and integration

Thu 9 May 2019

Musa Talluzi

The more smart devices are connected to the internet, the more in need of smarter systems we are. These systems should monitor, automate and maintain these devices in a robust and efficient way. In this demo, we simulate a factory plant containing multiple pieces of machinery. The system we built monitors these...

Java Reflection, but much faster

Tue 9 January 2018

Geoffrey De Smet

What is the fastest way to read a getter from a Java class without knowing the class at compilation time? Java frameworks often do this. A lot. And it can directly influence their performance. So let’s benchmark different approaches, such as reflection, method handles and code generation. The use case Presume we have a...