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OptaPlanner solves planning problems. This lightweight, embeddable planning engine implements powerful and scalable algorithms to optimize business resource scheduling and planning. This module contains the examples which demonstrate how to use it in a normal Java application.

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package org.optaplanner.examples.cloudbalancing.swingui.realtime;

import java.util.function.LongFunction;

import org.optaplanner.core.api.solver.change.ProblemChange;
import org.optaplanner.core.api.solver.change.ProblemChangeDirector;
import org.optaplanner.examples.cloudbalancing.domain.CloudBalance;
import org.optaplanner.examples.cloudbalancing.domain.CloudProcess;

public class AddProcessProblemChange implements ProblemChange {

    private final LongFunction generator;

    public AddProcessProblemChange(LongFunction generator) {
        this.generator = generator;
    }

    @Override
    public void doChange(CloudBalance cloudBalance, ProblemChangeDirector problemChangeDirector) {
        // Set a unique id on the new process
        long nextProcessId = 0L;
        for (CloudProcess otherProcess : cloudBalance.getProcessList()) {
            if (nextProcessId <= otherProcess.getId()) {
                nextProcessId = otherProcess.getId() + 1L;
            }
        }
        CloudProcess process = generator.apply(nextProcessId);
        // A SolutionCloner clones planning entity lists (such as processList), so no need to clone the processList here
        // Add the planning entity itself
        problemChangeDirector.addEntity(process, cloudBalance.getProcessList()::add);
    }

}