测试ReentrantReadWriteLock的相应特性

ReentrantReadWriteLock
所在的包是java.util.concurrent.locks.ReentrantReadWriteLock，读写锁所包含的锁有俩中，一种是与读操作相关的锁也被称为共享锁，一种是与写操作相关的锁也被称为排它锁，在没有写入操作时，读锁之间互不排斥，多个线程都可以获取读锁，当在涉及写入操作时，只有一个线程可以获取写锁进行写入操作，也就是说，当在读取时，多个线程可以同时获取读锁，当在写入式，只有一个线程可以写入。
互斥情况：读写互斥，写写互斥，写读互斥。
读锁：ReentrantReadWriteLock.readLock().lock(),
写锁：ReentrantReadWriteLock.writeLock().lock(),
读读共享的示例：

package com.example.demo.controller;

import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.ReentrantReadWriteLock;

/*
测试ReentrantReadWriteLock的读读共享
 */
public class LockTest {
    public static void main(String[] args) {
        ExecutorService executorService = new ThreadPoolExecutor(
                5,
                5,
                10,
                TimeUnit.SECONDS,
                new ArrayBlockingQueue<Runnable>(5));
        LOCKService lockService = new LOCKService();
        for(int i=0;i<3;i++){
            executorService.execute(new Runnable() {
                @Override
                public void run() {
                    try {
                        lockService.read();
                    }catch (Exception e){
                        e.printStackTrace();
                    }
                }
            });
        }
    }
}
class LOCKService{
    private ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
    public void read(){
        try {
            try {
                //设置写锁
                lock.readLock().lock();
                System.out.println("获得读锁"+"线程名为："+Thread.currentThread().getName()+"获取读锁时间为："+System.currentTimeMillis());
                Thread.sleep(10000);
            }finally {
                //释放读锁
                System.out.println("释放读锁："+"线程名为："+Thread.currentThread().getName()+"获取读锁时间为："+System.currentTimeMillis());
                lock.readLock().unlock();
            }
        }catch (Exception e){
            e.printStackTrace();
        }
    }
}

运行结果：写写互斥示例：

package com.example.demo.controller;

import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.ReentrantReadWriteLock;

/*
测试ReentrantReadWriteLock的写写互斥
 */
public class LockTest {
    public static void main(String[] args) {
        ExecutorService executorService = new ThreadPoolExecutor(
                5,
                5,
                10,
                TimeUnit.SECONDS,
                new ArrayBlockingQueue<Runnable>(5));
        LOCKService lockService = new LOCKService();
        for(int i=0;i<3;i++){
            executorService.execute(new Runnable() {
                @Override
                public void run() {
                    try {
                        lockService.write();
                    }catch (Exception e){
                        e.printStackTrace();
                    }
                }
            });
        }
    }
}
class LOCKService{
    private ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
    public void write(){
        try {
            try {
                //设置写锁
                lock.writeLock().lock();
                System.out.println("获得写锁"+"线程名为："+Thread.currentThread().getName()+"获取写锁时间为："+System.currentTimeMillis());
                Thread.sleep(10000);
            }finally {
                //释放读锁
                System.out.println("释放写锁："+"线程名为："+Thread.currentThread().getName()+"获取写锁时间为："+System.currentTimeMillis());
                lock.writeLock().unlock();
            }
        }catch (Exception e){
            e.printStackTrace();
        }
    }
}

运行结果：
读写互斥

package com.example.demo.controller;

import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.ReentrantReadWriteLock;

/*
测试ReentrantReadWriteLock的读写互斥
 */
public class LockTest {
    public static void main(String[] args) {
        ExecutorService executorService = new ThreadPoolExecutor(
                5,
                5,
                10,
                TimeUnit.SECONDS,
                new ArrayBlockingQueue<Runnable>(5));
        LOCKService lockService = new LOCKService();
        for(int i=0;i<3;i++){
            executorService.execute(new Runnable() {
                @Override
                public void run() {
                    try {
                        lockService.read();
                        lockService.write();
                    }catch (Exception e){
                        e.printStackTrace();
                    }
                }
            });
        }
    }
}
class LOCKService{
    private ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
    public void read(){
        try {
            try {
                //设置读锁
                lock.readLock().lock();
                System.out.println("获得读锁"+"线程名为："+Thread.currentThread().getName()+"获取读锁时间为："+System.currentTimeMillis());
                Thread.sleep(10000);
            }finally {
                lock.readLock().unlock();
                System.out.println("释放读锁"+"线程名为："+Thread.currentThread().getName()+"释放读锁时间为："+System.currentTimeMillis());
            }
        }catch (Exception e){
            e.printStackTrace();
        }
    }
    public void write(){
        try {
            try {
                //设置写锁
                lock.writeLock().lock();
                System.out.println("获得写锁"+"线程名为："+Thread.currentThread().getName()+"获取写锁时间为："+System.currentTimeMillis());
                Thread.sleep(10000);
            }finally {
                //释放写锁
                System.out.println("释放写锁："+"线程名为："+Thread.currentThread().getName()+"釋放写锁时间为："+System.currentTimeMillis());
                lock.writeLock().unlock();
            }
        }catch (Exception e){
            e.printStackTrace();
        }
    }
}

运行结果
写读互斥：

package com.example.demo.controller;

import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.ReentrantReadWriteLock;

/*
测试ReentrantReadWriteLock的写读互斥
 */
public class LockTest {
    public static void main(String[] args) {
        ExecutorService executorService = new ThreadPoolExecutor(
                5,
                5,
                10,
                TimeUnit.SECONDS,
                new ArrayBlockingQueue<Runnable>(5));
        LOCKService lockService = new LOCKService();
        for(int i=0;i<3;i++){
            executorService.execute(new Runnable() {
                @Override
                public void run() {
                    try {
                        lockService.write();
                        lockService.read();
                    }catch (Exception e){
                        e.printStackTrace();
                    }
                }
            });
        }
    }
}
class LOCKService{
    private ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
    public void read(){
        try {
            try {
                //设置读锁
                lock.readLock().lock();
                System.out.println("获得读锁"+"线程名为："+Thread.currentThread().getName()+"获取读锁时间为："+System.currentTimeMillis());
                Thread.sleep(10000);
            }finally {
                lock.readLock().unlock();
                System.out.println("释放读锁"+"线程名为："+Thread.currentThread().getName()+"释放读锁时间为："+System.currentTimeMillis());
            }
        }catch (Exception e){
            e.printStackTrace();
        }
    }
    public void write(){
        try {
            try {
                //设置写锁
                lock.writeLock().lock();
                System.out.println("获得写锁"+"线程名为："+Thread.currentThread().getName()+"获取写锁时间为："+System.currentTimeMillis());
                Thread.sleep(10000);
            }finally {
                //释放写锁
                System.out.println("释放写锁："+"线程名为："+Thread.currentThread().getName()+"釋放写锁时间为："+System.currentTimeMillis());
                lock.writeLock().unlock();
            }
        }catch (Exception e){
            e.printStackTrace();
        }
    }
}

运行结果：