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POHow to hand over a method call on a Master to n Workers and return?
 

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    <p>Let's assume we have n Workers which do some computation. The computation may take a while and n computations may run in parallel. Each Worker needs some data structure (not shared between Workers) to do the work. </p> <p>I thought about setting up each Worker during some initialization of the Master and handing over the required data structure to the Worker's constructor. </p> <pre><code>public class Master { public Master() { // initialize n Workers and "register" them "somewhere" } public boolean doCompute(int someInput) throws NoIdleWorkerException { // check if there is an idle Worker, otherwise throw NoIdleWorkerException // call the idle Worker, hand over someInput and wait for the result // synchronously return the result } } </code></pre> <p>A Worker may implement Runnable and then be handed over to a Thread. An instance of Worker may be reused.</p> <pre><code>public class Worker implements Runnable { private SomeDataStructure ds; public Worker(SomeDataStructure ds) { this.ds = ds; } public void run() { // may call doCompute, but run() doesn't has a return type } public boolean doCompute(int someInput) { // do the computation an return } } </code></pre> <p>What is the best way to manage the Worker instances? I was thinking about using ThreadFactory which returns a Thread only if a Worker instance is idle, otherwise null. Using this approach, I would have to manage Worker instances in some data structure.</p> <p>Also, since Master.doCompute(int someInput) has a return value but its computation is done by a Thread, thus asynchronously, I may have to use Futures. Are there any alternatives?</p>
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