49 lines
1.3 KiB
Java
49 lines
1.3 KiB
Java
//: concurrency/Philosopher.java
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// ©2015 MindView LLC: see Copyright.txt
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// A dining philosopher
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import java.util.concurrent.*;
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import java.util.*;
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import static net.mindview.util.Print.*;
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public class Philosopher implements Runnable {
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private Chopstick left;
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private Chopstick right;
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private final int id;
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private final int ponderFactor;
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private Random rand = new Random(47);
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private void pause() throws InterruptedException {
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if(ponderFactor == 0) return;
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TimeUnit.MILLISECONDS.sleep(
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rand.nextInt(ponderFactor * 250));
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}
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public Philosopher(Chopstick left, Chopstick right,
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int ident, int ponder) {
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this.left = left;
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this.right = right;
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id = ident;
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ponderFactor = ponder;
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}
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@Override
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public void run() {
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try {
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while(!Thread.interrupted()) {
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print(this + " " + "thinking");
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pause();
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// Philosopher becomes hungry
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print(this + " " + "grabbing right");
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right.take();
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print(this + " " + "grabbing left");
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left.take();
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print(this + " " + "eating");
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pause();
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right.drop();
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left.drop();
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}
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} catch(InterruptedException e) {
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print(this + " " + "exiting via interrupt");
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}
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}
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@Override
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public String toString() { return "Philosopher " + id; }
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} ///:~
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