在JUnit的@Test方法中启用多线程,新启动的线程会随着@Test主线程的死亡而死亡!导致没有任何输出
解决方法
1. 在@Test方法中每创建一个线程,就join一下,这样我们新建的线程不死亡,Test主线程也不会死亡。
2. 让主线程睡眠一会,等待其它线程结束后本线程在结束
3. 使用CountLatch等同步器同步一下,让主线程等其它线程结束后在结束
其它方法,总之就是让@Test的线程等待我们新建的线程运行结束后再结束
直接实现第三种
package com.zjm;
import com.zjm.bean.Stock;
import com.zjm.redis.RedisLock;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;
import java.util.concurrent.CountDownLatch;
@RunWith(SpringRunner.class)
@SpringBootTest(classes = ZookeeperApplication.class, webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
public class TestStock {
@Autowired
public RedisLock redisLock;
CountDownLatch countDownLatch = new CountDownLatch(2);
public class StockThread implements Runnable{
public RedisLock redisLock;
public StockThread(RedisLock redisLock){
this.redisLock=redisLock;
}
public void run(){
redisLock.lock();
boolean b = new Stock().reduceStock();
redisLock.unlock();
if (b){
System.out.println(Thread.currentThread().getName()+":减少库存成功");
}else{
System.out.println(Thread.currentThread().getName()+":减少库存失败");
}
countDownLatch.countDown();
}
}
@Test
public void test(){
new Thread(new StockThread(redisLock),"线程2").start();
new Thread(new StockThread(redisLock),"线程1").start();
try {
countDownLatch.await();
} catch (InterruptedException e) {
e.printStackTrace();
}
//单元测试无法测试多线程!!!!需要借助 可以利用三方工具:GroboUtils。
// new Thread(new StockThread(redisLock),"线程1").start();
// new Thread(new StockThread(redisLock),"线程2").start();
/* redisLock.lock();
boolean b = new Stock().reduceStock();
redisLock.unlock();
if (b){
System.out.println(Thread.currentThread().getName()+":减少库存成功");
}else{
System.out.println(Thread.currentThread().getName()+":减少库存失败");
}*/
}
}