50 lines
1.6 KiB
Java
50 lines
1.6 KiB
Java
// concurrent/Pizza.java
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// (c)2017 MindView LLC: see Copyright.txt
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// We make no guarantees that this code is fit for any purpose.
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// Visit http://OnJava8.com for more book information.
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import java.util.function.*;
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import onjava.Nap;
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public class Pizza {
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public enum Step {
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DOUGH(4), ROLLED(1), SAUCED(1), CHEESED(2),
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TOPPED(5), BAKED(2), SLICED(1), BOXED(0);
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int effort; // Needed to get to the next step
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Step(int effort) { this.effort = effort; }
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Step forward() {
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if(equals(BOXED)) return BOXED;
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new Nap(effort * 0.1);
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return values()[ordinal() + 1];
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}
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}
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private Step step = Step.DOUGH;
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private final int id;
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public Pizza(int id) { this.id = id; }
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public Pizza next() {
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step = step.forward();
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System.out.println("Pizza " + id + ": " + step);
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return this;
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}
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public Pizza next(Step previousStep) {
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if(!step.equals(previousStep))
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throw new IllegalStateException("Expected " +
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previousStep + " but found " + step);
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return next();
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}
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public Pizza roll() { return next(Step.DOUGH); }
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public Pizza sauce() { return next(Step.ROLLED); }
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public Pizza cheese() { return next(Step.SAUCED); }
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public Pizza toppings() { return next(Step.CHEESED); }
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public Pizza bake() { return next(Step.TOPPED); }
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public Pizza slice() { return next(Step.BAKED); }
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public Pizza box() { return next(Step.SLICED); }
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public boolean complete() {
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return step.equals(Step.BOXED);
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}
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@Override
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public String toString() {
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return "Pizza" + id + ": " +
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(step.equals(Step.BOXED)? "complete" : step);
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}
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}
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