11.2. Running the Cloud Balancing Hello World

Procedure

1. Download and configure the examples in your preferred IDE. For instructions on downloading and configuring examples in an IDE, see 「Running the Red Hat Business Optimizer examples in an IDE (IntelliJ, Eclipse, or Netbeans)」.

2. Create a run configuration with the following main class: org.optaplanner.examples.cloudbalancing.app.CloudBalancingHelloWorld

   By default, the Cloud Balancing Hello World is configured to run for 120 seconds.

1. Build the Solver based on a solver configuration (in this case an XML file, cloudBalancingSolverConfig.xml, from the classpath).

   Building the Solver is the most complicated part of this procedure. For more details, see 「Solver Configuration」.

           SolverFactory<CloudBalance> solverFactory = SolverFactory.createFromXmlResource(
                   "org/optaplanner/examples/cloudbalancing/solver/cloudBalancingSolverConfig.xml");
           Solver solver<CloudBalance> = solverFactory.buildSolver();

2. Load the problem.

   CloudBalancingGenerator generates a random problem: you will replace this with a class that loads a real problem, for example from a database.

           CloudBalance unsolvedCloudBalance = new CloudBalancingGenerator().createCloudBalance(400, 1200);

3. Solve the problem.

           CloudBalance solvedCloudBalance = solver.solve(unsolvedCloudBalance);

4. Display the result.

           System.out.println("\nSolved cloudBalance with 400 computers and 1200 processes:\n"
                   + toDisplayString(solvedCloudBalance));