下面程序代码通过使用Lock锁执行简单的流水线任务：
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();
}
}
}
执行结果如下：
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