package com.ls.java_concurrency.countdownlatch;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.Executors;
import java.util.concurrent.SynchronousQueue;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
/**
* Another typical usage would be to divide a problem into N parts,
* describe each part with a Runnable that executes that portion and
* counts down on the latch, and queue all the Runnables to an
* Executor. When all sub-parts are complete, the coordinating thread
* will be able to pass through await. (When threads must repeatedly
* count down in this way, instead use a CyclicBarrier.)
* @author astute_sparrow
* ------Driver------
*/
public class CountDownLatchAnotherDemo {
public static void main(String[] args) throws InterruptedException {
CountDownLatch doneSignal = new CountDownLatch(10);
final BlockingQueue<Runnable> queue = new SynchronousQueue<Runnable>();
final ThreadPoolExecutor executor = new ThreadPoolExecutor(10, 600, 30,
TimeUnit.SECONDS, queue, Executors.defaultThreadFactory(),
new ThreadPoolExecutor.AbortPolicy());
for(int i=0; i<20; i++)
executor.execute(new WorkerRunnable(doneSignal, 1));
System.out.println("Main Thread starts......");
Thread.sleep(10000);
doneSignal.await();
System.out.println("All sub thread ends!!!");
}
}
class WorkerRunnable implements Runnable {
private final CountDownLatch doneSignal;
private final int i;
WorkerRunnable(CountDownLatch doneSignal, int i) {
this.doneSignal = doneSignal;
this.i = i;
}
public void run() {
doWork(i);
doneSignal.countDown();
}
void doWork(int i) {
System.out.println("......doWork......" + Thread.currentThread());
}
}
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