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();
    }
  }
}