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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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/*
 * Copyright 2015 Red Hat, Inc. and/or its affiliates.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.optaplanner.examples.projectjobscheduling.domain.solver;

import java.util.ArrayDeque;
import java.util.Objects;
import java.util.Queue;

import org.optaplanner.core.impl.domain.variable.listener.VariableListener;
import org.optaplanner.core.impl.score.director.ScoreDirector;
import org.optaplanner.examples.projectjobscheduling.domain.Allocation;

public class PredecessorsDoneDateUpdatingVariableListener implements VariableListener {

    @Override
    public void beforeEntityAdded(ScoreDirector scoreDirector, Allocation allocation) {
        // Do nothing
    }

    @Override
    public void afterEntityAdded(ScoreDirector scoreDirector, Allocation allocation) {
        updateAllocation(scoreDirector, allocation);
    }

    @Override
    public void beforeVariableChanged(ScoreDirector scoreDirector, Allocation allocation) {
        // Do nothing
    }

    @Override
    public void afterVariableChanged(ScoreDirector scoreDirector, Allocation allocation) {
        updateAllocation(scoreDirector, allocation);
    }

    @Override
    public void beforeEntityRemoved(ScoreDirector scoreDirector, Allocation allocation) {
        // Do nothing
    }

    @Override
    public void afterEntityRemoved(ScoreDirector scoreDirector, Allocation allocation) {
        // Do nothing
    }

    protected void updateAllocation(ScoreDirector scoreDirector, Allocation originalAllocation) {
        Queue uncheckedSuccessorQueue = new ArrayDeque<>();
        uncheckedSuccessorQueue.addAll(originalAllocation.getSuccessorAllocationList());
        while (!uncheckedSuccessorQueue.isEmpty()) {
            Allocation allocation = uncheckedSuccessorQueue.remove();
            boolean updated = updatePredecessorsDoneDate(scoreDirector, allocation);
            if (updated) {
                uncheckedSuccessorQueue.addAll(allocation.getSuccessorAllocationList());
            }
        }
    }

    /**
     * @param scoreDirector never null
     * @param allocation never null
     * @return true if the startDate changed
     */
    protected boolean updatePredecessorsDoneDate(ScoreDirector scoreDirector, Allocation allocation) {
        // For the source the doneDate must be 0.
        Integer doneDate = 0;
        for (Allocation predecessorAllocation : allocation.getPredecessorAllocationList()) {
            int endDate = predecessorAllocation.getEndDate();
            doneDate = Math.max(doneDate, endDate);
        }
        if (Objects.equals(doneDate, allocation.getPredecessorsDoneDate())) {
            return false;
        }
        scoreDirector.beforeVariableChanged(allocation, "predecessorsDoneDate");
        allocation.setPredecessorsDoneDate(doneDate);
        scoreDirector.afterVariableChanged(allocation, "predecessorsDoneDate");
        return true;
    }

}