一、Redis集群简介
1、RedisCluster概念
Redis的分布式解决方案，在3.0版本后推出的方案，有效地解决了Redis分布式的需求，当一个服务宕机可以快速的切换到另外一个服务。redis cluster主要是针对海量数据+高并发+高可用的场景。
2、Redis环境搭建
二、与SpringBoot2.0整合
1、核心依赖
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-redis</artifactId>
<version>${spring-boot.version}</version>
</dependency>
<dependency>
<groupId>redis.clients</groupId>
<artifactId>jedis</artifactId>
<version>${redis-client.version}</version>
</dependency>
2、核心配置
spring:
# Redis 集群
redis:
sentinel:
# sentinel 配置
master: mymaster
nodes: 192.168.0.127:26379
maxTotal: 60
minIdle: 10
maxWaitMillis: 10000
testWhileIdle: true
testOnBorrow: true
testOnReturn: false
timeBetweenEvictionRunsMillis: 10000
3、参数渲染类
@ConfigurationProperties(prefix = "spring.redis.sentinel")
public class RedisParam {
private String nodes ;
private String master ;
private Integer maxTotal ;
private Integer minIdle ;
private Integer maxWaitMillis ;
private Integer timeBetweenEvictionRunsMillis ;
private boolean testWhileIdle ;
private boolean testOnBorrow ;
private boolean testOnReturn ;
// 省略GET和SET方法
}
4、集群配置文件
@Configuration
@EnableConfigurationProperties(RedisParam.class)
public class RedisPool {
@Resource
private RedisParam redisParam ;
@Bean("jedisSentinelPool")
public JedisSentinelPool getRedisPool (){
Set<String> sentinels = new HashSet<>();
sentinels.addAll(Arrays.asList(redisParam.getNodes().split(",")));
GenericObjectPoolConfig poolConfig = new GenericObjectPoolConfig();
poolConfig.setMaxTotal(redisParam.getMaxTotal());
poolConfig.setMinIdle(redisParam.getMinIdle());
poolConfig.setMaxWaitMillis(redisParam.getMaxWaitMillis());
poolConfig.setTestWhileIdle(redisParam.isTestWhileIdle());
poolConfig.setTestOnBorrow(redisParam.isTestOnBorrow());
poolConfig.setTestOnReturn(redisParam.isTestOnReturn());
poolConfig.setTimeBetweenEvictionRunsMillis(redisParam.getTimeBetweenEvictionRunsMillis());
JedisSentinelPool redisPool = new JedisSentinelPool(redisParam.getMaster(), sentinels, poolConfig);
return redisPool;
}
@Bean
SpringUtil springUtil() {
return new SpringUtil();
}
@Bean
RedisListener redisListener() {
return new RedisListener();
}
}
5、配置Redis模板类
@Configuration
public class RedisConfig {
@Bean
public StringRedisTemplate stringRedisTemplate(RedisConnectionFactory factory) {
StringRedisTemplate stringRedisTemplate = new StringRedisTemplate();
stringRedisTemplate.setConnectionFactory(factory);
return stringRedisTemplate;
}
}
三、模拟队列场景案例
生产者消费者模式：客户端监听消息队列，消息达到，消费者马上消费，如果消息队列里面没有消息，那么消费者就继续监听。基于Redis的LPUSH（BLPUSH）把消息入队，用 RPOP（BRPOP）获取消息的模式。
1、加锁解锁工具
@Component
public class RedisLock {
private static String keyPrefix = "RedisLock:";
@Resource
private JedisSentinelPool jedisSentinelPool;
public boolean addLock(String key, long expire) {
Jedis jedis = null;
try {
jedis = jedisSentinelPool.getResource();
/*
* nxxx的值只能取NX或者XX，如果取NX，则只有当key不存在是才进行set，如果取XX，则只有当key已经存在时才进行set
* expx的值只能取EX或者PX，代表数据过期时间的单位，EX代表秒，PX代表毫秒。
*/
String value = jedis.set(keyPrefix + key, "1", "nx", "ex", expire);
return value != null;
} catch (Exception e){
e.printStackTrace();
}finally {
if (jedis != null) jedis.close();
}
return false;
}
public void removeLock(String key) {
Jedis jedis = null;
try {
jedis = jedisSentinelPool.getResource();
jedis.del(keyPrefix + key);
} finally {
if (jedis != null) jedis.close();
}
}
}
2、消息消费
1）封装接口
public interface RedisHandler {
/**
* 队列名称
*/
String queueName();
/**
* 队列消息内容
*/
String consume (String msgBody);
}
2）接口实现
@Component
public class LogAListen implements RedisHandler {
private static final Logger LOG = LoggerFactory.getLogger(LogAListen.class) ;
@Resource
private RedisLock redisLock;
@Override
public String queueName() {
return "LogA-key";
}
@Override
public String consume(String msgBody) {
// 加锁，防止消息重复投递
String lockKey = "lock-order-uuid-A";
boolean lock = false;
try {
lock = redisLock.addLock(lockKey, 60);
if (!lock) {
return "success";
}
LOG.info("LogA-key == >>" + msgBody);
} catch (Exception e){
e.printStackTrace();
} finally {
if (lock) {
redisLock.removeLock(lockKey);
}
}
return "success";
}
}
3、消息监听器
public class RedisListener implements InitializingBean {
/**
* Redis 集群
*/
@Resource
private JedisSentinelPool jedisSentinelPool;
private List<RedisHandler> handlers = null;
private ExecutorService product = null;
private ExecutorService consumer = null;
/**
* 初始化配置
*/
@Override
public void afterPropertiesSet() {
handlers = SpringUtil.getBeans(RedisHandler.class) ;
product = new ThreadPoolExecutor(10,15,60 * 3,
TimeUnit.SECONDS,new SynchronousQueue<>());
consumer = new ThreadPoolExecutor(10,15,60 * 3,
TimeUnit.SECONDS,new SynchronousQueue<>());
for (RedisHandler redisHandler : handlers){
product.execute(() -> {
redisTask(redisHandler);
});
}
}
/**
* 队列监听
*/
public void redisTask (RedisHandler redisHandler){
Jedis jedis = null ;
while (true){
try {
jedis = jedisSentinelPool.getResource() ;
List<String> msgBodyList = jedis.brpop(0, redisHandler.queueName());
if (msgBodyList != null && msgBodyList.size()>0){
consumer.execute(() -> {
redisHandler.consume(msgBodyList.get(1)) ;
});
}
} catch (Exception e){
e.printStackTrace();
} finally {
if (jedis != null) jedis.close();
}
}
}
}
4、消息生产者
@Service
public class RedisServiceImpl implements RedisService {
@Resource
private JedisSentinelPool jedisSentinelPool;
@Override
public void saveQueue(String queueKey, String msgBody) {
Jedis jedis = null;
try {
jedis = jedisSentinelPool.getResource();
jedis.lpush(queueKey,msgBody) ;
} catch (Exception e){
e.printStackTrace();
} finally {
if (jedis != null) jedis.close();
}
}
}
5、场景测试接口
@RestController
public class RedisController {
@Resource
private RedisService redisService ;
/**
* 队列推消息
*/
@RequestMapping("/saveQueue")
public String saveQueue (){
MsgBody msgBody = new MsgBody() ;
msgBody.setName("LogAModel");
msgBody.setDesc("描述");
msgBody.setCreateTime(new Date());
redisService.saveQueue("LogA-key", JSONObject.toJSONString(msgBody));
return "success" ;
}
}
四、源代码地址
GitHub地址：知了一笑
https://github.com/cicadasmile/middle-ware-parent
码云地址：知了一笑
https://gitee.com/cicadasmile/middle-ware-parent
原文发布于微信公众号 - 知了一笑（cicada_smile）
https://www.cnblogs.com/toutou/archive/2019/02/11/redis_lock.html