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PO"Dining Philosophers" using Fututre in Java
 

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  1. PO"Dining Philosophers" using Fututre in Java
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    <p>I am trying to solve Philosopher Problem using Future in Java.</p> <pre><code> public class Philo implements Callable&lt;PhiloStatus&gt; { private PhiloStatus status; private Philo leftPhilo; private Philo rightPhilo; private String name; public Philo(String name) { status = PhiloStatus.THINKING; this.name =name; } public void setLeftPhilo(Philo leftPhilo) { this.leftPhilo = leftPhilo; } enter code here public void setRightPhilo(Philo rightPhilo) { this.rightPhilo = rightPhilo; } @Override public PhiloStatus call() throws Exception { if (leftPhilo.getStatus() == PhiloStatus.THINKING &amp;&amp; rightPhilo.getStatus() == PhiloStatus.THINKING) { this.status =PhiloStatus.DINING; System.out.println("Dininig "+this); return PhiloStatus.DINING; } this.status =PhiloStatus.THINKING; System.out.println("Thinking "+this); return PhiloStatus.THINKING; } public PhiloStatus getStatus() { return status; } @Override public String toString() { // TODO Auto-generated method stub return name; } } </code></pre> <p>Starting point of the program</p> <pre><code>public class Start { /** * @param args */ public static void main(String[] args) { ExecutorService executorService = Executors.newFixedThreadPool(5); Philo[] philosophers = new Philo[5]; for (int i = 0; i &lt; 5; ++i) philosophers[i] = new Philo(""+i); for (int i = 0; i &lt; 5; ++i) { philosophers[i].setLeftPhilo(philosophers[(i + 4) % 5]); philosophers[i].setRightPhilo(philosophers[(i + 1) % 5]); executorService.submit( philosophers[i]); } } } </code></pre> <p>But seems like once Callable is finished executing , it returns the same result.</p> <p>I doubt now that it might not be possible to solve this problem using Future? </p> <p>Could anyone please shed a light on this.</p>
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    1. COI think the error is in the part where you actually use the Callable. Can you please post that code part?
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    2. COThe lifecycle of the callable is till it returns the result, while the lifecycle of the algorithm is much more than that. The philosopher must not complete execution by returning status.
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    3. CO@TwoThe added the code.
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      1. USnish1013
 

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