下面程序代碼通過使用Lock鎖執行簡單的流水線任務：

import java.util.concurrent.locks.Condition;

import java.util.concurrent.locks.Lock;

import java.util.concurrent.locks.ReentrantLock;

/**

* @author lzq

* @data 2020/4/29 0029 - 下午 9:48

*/

public class TestLock {

public static void main(String[] args) {

DataSource dataSource=new DataSource();

new Thread(() -> {

for (int i=0;i<10;i++){

dataSource.a();

}

},"A").start();

new Thread(() -> {

for (int i=0;i<10;i++){

dataSource.b();

}

},"B").start();

new Thread(() -> {

for (int i=0;i<10;i++){

dataSource.c();

}

},"C").start();

}

}

class DataSource{

private int x=1;

private Lock lock=new ReentrantLock();

private Condition condition1=lock.newCondition();

private Condition condition2=lock.newCondition();

private Condition condition3=lock.newCondition();

public void a(){

lock.lock();

try {

while(x!=1){

condition1.await();

}

System.out.println(Thread.currentThread().getName()+":aaa");

x=2;

condition2.signal();

} catch (InterruptedException e) {

e.printStackTrace();

} finally {

lock.unlock();

}

}

public void b(){

lock.lock();

try {

while(x!=2){

condition2.await();

}

System.out.println(Thread.currentThread().getName()+":bbb");

x=3;

condition3.signal();

} catch (InterruptedException e) {

e.printStackTrace();

} finally {

lock.unlock();

}

}

public void c(){

lock.lock();

try {

while(x!=3){

condition3.await();

}

System.out.println(Thread.currentThread().getName()+":ccc");

x=1;

condition1.signal();

} catch (InterruptedException e) {

e.printStackTrace();

} finally {

lock.unlock();

}

}

}

執行結果如下：

總結

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