使用spring+redisson解决集群同步锁问题

提要：先说明下应用场景，例如：在修改订单的时候，防止同一个订单号，只有一个线程在修改，如果多个修改，则后面的等待一定时间后直接报错（支持集群）。

基础组件：redis、spring

1.spring的配置我这里不再详细说明，具体可以自己去搜搜 如何搭建spring。创建spring-redisson.xml，并且引入到spring配置中：

<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"xmlns:redisson="http://redisson.org/schema/redisson"xsi:schemaLocation="http://www.springframework.org/schema/beans         http://www.springframework.org/schema/beans/spring-beans.xsd         http://www.springframework.org/schema/context         http://www.springframework.org/schema/context/spring-context.xsd         http://redisson.org/schema/redisson         http://redisson.org/schema/redisson/redisson.xsd"><redisson:client id="redissonClient"><redisson:single-server address="redis://${redis.host}"password="${redis.password}" database="${redis.database}" /></redisson:client></beans>

其中 ${redis.host} 配置127.0.0.1:7396之类地址，前面一定要加上redis:// 否则会报错。password、database可以不配置

2.编写Junit test

基础测试类：

package com.ideacome.car.scanner.test.base;import org.junit.Test;import org.junit.runner.RunWith;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import org.springframework.test.context.ContextConfiguration;import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;import org.springframework.transaction.annotation.Transactional;/** * 功能介绍: 基础测试类，用于继承</br> * * @author： 罗成</br> */@RunWith(SpringJUnit4ClassRunner.class)@ContextConfiguration(locations = {"classpath:spring/applicationContextTest.xml"})@Transactionalpublic class BaseTest {    protected static final Logger LOGGER = LoggerFactory.getLogger(BaseTest.class);    @Test    public void doBaseTest() {        LOGGER.info("doBaseTest");    }}

redisson测试类：

package com.ideacome.car.scanner.test.service;import java.util.concurrent.TimeUnit;import org.apache.commons.lang3.StringUtils;import org.junit.Test;import org.redisson.api.RLock;import org.redisson.api.RedissonClient;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.beans.factory.annotation.Value;import org.springframework.test.annotation.Rollback;import com.ideacome.business.car.scanner.param.Address;import com.ideacome.business.car.scanner.param.CarInfo;import com.ideacome.business.car.scanner.param.QueryCarInfoInParam;import com.ideacome.business.car.scanner.service.QueryCarInfoService;import com.ideacome.car.scanner.core.config.HandlerChainFactory;import com.ideacome.car.scanner.dto.convert.CarInfoConvert;import com.ideacome.car.scanner.dto.zt.ZTQueryCarModeData;import com.ideacome.car.scanner.dto.zt.ZTQueryCarModeRequest;import com.ideacome.car.scanner.test.base.BaseTest;import com.ideacome.car.scanner.util.ZTSignatureTools;import com.ideacome.common.entity.result.Result;import com.ideacome.common.enums.AppMark;import com.ideacome.common.utils.DateUtils;import com.ideacome.common.utils.GsonUtils;import com.ideacome.common.utils.HttpUtils;/** * 测试Redisson * * @author 罗成 */public class RedissonTest extends BaseTest {    @Autowired    private RedissonClient redissonClient;    @Test    public void testLock() throws Exception {        Thread t1 = new MyThread();        Thread t2 = new MyThread();        t1.setName("t1");        t2.setName("t2");        t1.start();        t2.start();        Thread.sleep(100 * 1000);    }    public class MyThread extends Thread {        @Override        public void run() {            try {                LOGGER.info(getName() + "run start");                RLock rLock = redissonClient.getLock("testLcok");                if (rLock.tryLock(5, TimeUnit.SECONDS)) {                    LOGGER.info(getName() + "get lock");                    Thread.sleep(10 * 1000);                }                LOGGER.info(getName() + "run over");            } catch (Exception e) {                e.printStackTrace();            }        }    }}

运行结果为：

2017/11/22-16:58:11.216 INFO [t2] com.ideacome.car.scanner.test.service.RedissonTest$MyThread:57>>>>>t2run start
2017/11/22-16:58:11.216 INFO [t1] com.ideacome.car.scanner.test.service.RedissonTest$MyThread:57>>>>>t1run start
2017/11/22-16:58:11.238 INFO [t1] com.ideacome.car.scanner.test.service.RedissonTest$MyThread:60>>>>>t1get lock
2017/11/22-16:58:16.223 INFO [t2] com.ideacome.car.scanner.test.service.RedissonTest$MyThread:63>>>>>t2run over
2017/11/22-16:58:21.239 INFO [t1] com.ideacome.car.scanner.test.service.RedissonTest$MyThread:63>>>>>t1run over

可见 线程t1 运行10秒后runover 线程2 并没有获取锁，等待5秒后 runover