Main.java Source code

Introduction

Here is the source code for Main.java

Source

import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;

public class Main {
    int[] itemsToBeProcessed;

    public static void main(String[] args) {
        new Main(32).processUsers(4);
    }

    public Main(int size) {
        itemsToBeProcessed = new int[size];
    }

    public void processUsers(int numOfWorkerThreads) {
        ExecutorService threadPool = Executors.newFixedThreadPool(numOfWorkerThreads);
        int chunk = itemsToBeProcessed.length / numOfWorkerThreads;
        int start = 0;
        List<Future> tasks = new ArrayList<Future>();
        for (int i = 0; i < numOfWorkerThreads; i++) {
            tasks.add(threadPool.submit(new WorkerThread(start, start + chunk)));
            start = start + chunk;
        }
        // join all worker threads to main thread
        for (Future f : tasks) {
            try {
                f.get();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        threadPool.shutdown();
        while (!threadPool.isTerminated()) {
        }
    }
}

class WorkerThread implements Callable {
    int startIndex, endIndex;

    public WorkerThread(int startIndex, int endIndex) {
        this.startIndex = startIndex;
        this.endIndex = endIndex;
    }

    @Override
    public Object call() throws Exception {
        for (int currentUserIndex = startIndex; currentUserIndex < endIndex; currentUserIndex++) {
            // Add your logic here
            System.out.println(currentUserIndex + " is the user being processed in thread "
                    + Thread.currentThread().getName());
        }
        return null;
    }
}