47 lines
1.5 KiB
Java
47 lines
1.5 KiB
Java
// concurrent/Pizza.java
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// (c)2016 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 static java.util.concurrent.TimeUnit.*;
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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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try {
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MILLISECONDS.sleep(effort * 100);
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} catch(InterruptedException e) {
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throw new RuntimeException(e);
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}
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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 void next() {
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step = step.forward();
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System.out.println("Pizza " + id + ": " + step);
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}
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public void 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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next();
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}
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public void roll() { next(Step.DOUGH); }
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public void sauce() { next(Step.ROLLED); }
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public void cheese() { next(Step.SAUCED); }
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public void toppings() { next(Step.CHEESED); }
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public void bake() { next(Step.TOPPED); }
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public void slice() { next(Step.BAKED); }
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public void box() { 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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}
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