纯demo代码
package com.honey;
import java.util.Arrays;
import java.util.List;
import java.util.concurrent.*;
public class ConsumerQueueDemo {
public static void main(String[] args) {
//making hot spot code
// for (int i = 0; i < 100; i++) {
// blockingVersion(false);
// lockFreeVersion(false);
// }
System.err.println("///=============///");
blockingVersion(true);
lockFreeVersion(true);
}
private static void blockingVersion(boolean print) {
List<Integer> array = g();
BlockingQueue blockingQueue = new ArrayBlockingQueue(array.size(), false, array);
long startMills = System.currentTimeMillis();
int threadNum = 10;
CountDownLatch countDownLatch = new CountDownLatch(threadNum);
ExecutorService pool = Executors.newFixedThreadPool(threadNum);
for (int i = 0; i < threadNum; i++) {
pool.execute(new BlockingConsumer(blockingQueue, countDownLatch));
}
pool.shutdown();
try {
countDownLatch.await();
} catch (InterruptedException e) {
//
}
if (print)
System.out.println("blocking version cost ms:" + (System.currentTimeMillis() - startMills));
}
private static void lockFreeVersion(boolean print) {
List<Integer> array = g();
ConcurrentLinkedQueue linkedQueue = new ConcurrentLinkedQueue(Arrays.asList(array));
long startMills = System.currentTimeMillis();
int threadNum = 10;
CountDownLatch countDownLatch = new CountDownLatch(threadNum);
ExecutorService pool = Executors.newFixedThreadPool(threadNum);
for (int i = 0; i < threadNum; i++) {
pool.execute(new LockFreeConsumer(linkedQueue, countDownLatch));
}
pool.shutdown();
try {
countDownLatch.await();
} catch (InterruptedException e) {
//
}
if (print)
System.out.println("lock free cost ms:" + (System.currentTimeMillis() - startMills));
}
static class BlockingConsumer implements Runnable {
final BlockingQueue blockingQueue;
final CountDownLatch countDownLatch;
BlockingConsumer(BlockingQueue blockingQueue, CountDownLatch countDownLatch) {
this.blockingQueue = blockingQueue;
this.countDownLatch = countDownLatch;
}
@Override
public void run() {
try {
for (; ; ) {
Object object = blockingQueue.poll();
if (object == null) {
return;
}
//doing works
Thread.sleep(20L);
}
} catch (InterruptedException e) {
//
} finally {
countDownLatch.countDown();
}
}
}
static class LockFreeConsumer implements Runnable {
final ConcurrentLinkedQueue linkedQueue;
final CountDownLatch countDownLatch;
LockFreeConsumer(ConcurrentLinkedQueue linkedQueue, CountDownLatch countDownLatch) {
this.linkedQueue = linkedQueue;
this.countDownLatch = countDownLatch;
}
@Override
public void run() {
try {
for (; ; ) {
Object object = linkedQueue.poll();
if (object == null) {
return;
}
//doing works
Thread.sleep(20L);
}
} catch (InterruptedException e) {
//
} finally {
countDownLatch.countDown();
}
}
}
static List<Integer> g() {
Integer[] array = new Integer[10_000];
Arrays.fill(array, 0);
return Arrays.asList(array);
}
}
结果
///
///
///
///=============///
blocking version cost ms:22052
lock free cost ms:22
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