Optaplanner添加计算机室限制 [英] Optaplanner add computerroom restriction

问题描述

这是我在这里的第一篇文章，我发布为我的学习Java程序员的学校项目团队。所以我们不是好的程序员。
如何添加约束，使Optaplanner将讲座移动到特定的房间类型。
例如，我想将编程课程移动到计算机室，在正常的房间里演讲数学。但是我的约束声明了硬约束，但不移动他们的房间里的讲座。这应该是一个负约束。所以显示这个硬约束的负分数，但它仍然不会被解决/移动。

it's my first post here and I'm posting for my team of learning Java programmer for an school project. So we aren't good programmer. how can I add a constraint to make the Optaplanner move the lectures into a specific room type. For example I want to move the lecture "Programming" into a computerroom and the lecture "Math" in a normal room. But with my constraint it declares the hard constraints but doesn't move the lectures in their room. This should be a negative constraint. So the negative score for this hard constraint is shown, but it still won't be resolved/moved.

以下是约束：

rule "computerroom"
    when
       $room : Room($computerroom : computerroom)
       $course : Course(computerroom == $computerroom)
    then
        scoreHolder.addHardConstraintMatch(kcontext, -1);
end

我们在Room类中添加了一个新变量， p>

We added a new variable to the class Room, that look like:

package org.optaplanner.examples.curriculumcourse.domain;

import com.thoughtworks.xstream.annotations.XStreamAlias;
import org.optaplanner.examples.common.domain.AbstractPersistable;

@XStreamAlias("Room")
public class Room extends AbstractPersistable {

    private String code;
    private int capacity;
    private boolean computerroom;

    public String getCode() {
        return code;
    }

    public void setCode(String code) {
        this.code = code;
    }

    public boolean getComputerroom() {
        return computerroom;
    }

    public void setComputerroom(boolean computerroom) {
        this.computerroom = computerroom;
    }

    public int getCapacity() {
        return capacity;
    }

    public void setCapacity(int capacity) {
        this.capacity = capacity;
    }

    public String getLabel() {
        return code;
    }

    @Override
    public String toString() {
        return code + " {C" + capacity + "}";
    }

}

我们？

另一件小事：Optaplanner获得了大量的数据：
我们如何增加解决的最大秒花费？因为我们尝试了超过1152的其他值，但它不工作。
这只是一个小问题，约束更重要，但我们很乐意让程序运行！

Another little thing: the Optaplanner gets a lot of data to work with: How can we increase the maximun seconds spend for resolving? Because we tried other values over 1152 but it does't work. It's only a little question, the constraint is more important, but we would be happy to get the program running!

Greets
SEP2014

Greets SEP2014

推荐答案

该分数规则不检查任何计划变量（=在解决过程中更改的变量）。

That score rule isn't checking anything that is "planning variable" (= a variable that changes during solving). So it's static, it can never have a different score than with what it starts out with.

请考虑这样做：

rule "computerroom"
  when
    // If there's a room which has no computer
    $r : Room(hasComputer == false)
    // And we're putting a course which needs a computer in that room
    $course : Course(needsComputer == true, room == $r)
  then
    scoreHolder.addHardConstraintMatch(kcontext, -1);
end

这里重要的是 ...，room == $ r） 。 room 是一个规划变量：在规划期间会发生变化。

The important thing here is Course(..., room == $r). That room is a planning variable: it changes during planning.

注意：

相同的规则，但写得更短，更有效率

Same rule, but written shorter and more efficiently:

rule "computerroom"
  when
    $course : Course(needsComputer == true, room != null, room.hasComputer == false)
  then
    scoreHolder.addHardConstraintMatch(kcontext, -1);
end

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