disconf-基于xml分布式配置管理redis

本文介绍disconf如何管理redis（单机和集群）的配置

1. redis单机
   注意，pom中jedis的版本必须2.4.2及以下版本，否则报错
   新建redis-single.properties，内容为：
   

   # redis jedis version 2.4.2
   redis.host=localhost
   redis.port=6379
   redis.password=

   新建redis-single.xml，内容为：
   

   xml version="1.0" encoding="UTF-8"?>
   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:p="http://www.springframework.org/schema/p" xmlns:c="http://www.springframework.org/schema/c"
     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">
   
     id="jedisConnectionFactory"
       class="org.springframework.data.redis.connection.jedis.JedisConnectionFactory"
       p:host-name="${redis.host}" p:port="${redis.port}" p:password="${redis.password}"
       p:use-pool="true" />
   
     id="stringRedisSerializer"
       class="org.springframework.data.redis.serializer.StringRedisSerializer" />
   
     id="redisTemplate" class="org.springframework.data.redis.core.RedisTemplate"
       p:connection-factory-ref="jedisConnectionFactory"
       p:defaultSerializer-ref="stringRedisSerializer" />
   
   
   

   这里主要是用的spring data redis，注入redisTemplate就可以使用spring data封装的api
2. redis集群
   由于我们redis搭建的是真实集群（基于3.0以上的版本），而目前spring data redis还不支持redis的集群，所以必须使用原生的jedis，做了个简单的封装如下
   

   public class JedisClusterFactory implements FactoryBean, InitializingBean {
   
   private JedisCluster jedisCluster;
       private Integer timeout;
       private String cluster;
   
       private Set parseHostAndPort() {
           String[] clusters = this.cluster.split(",");
           Set haps = new HashSet();
           for (String c : clusters) {
               String[] ipAndPort = c.split(":");
               HostAndPort hap = new HostAndPort(ipAndPort[0], Integer.parseInt(ipAndPort[1]));
               haps.add(hap);
           }
   return haps;
       }
   
   @Override
       public JedisCluster getObject() throws Exception {
   return jedisCluster;
       }
   
   @Override
       public Class getObjectType() {
   return (this.jedisCluster != null ? this.jedisCluster.getClass() : JedisCluster.class);
       }
   
   @Override
       public boolean isSingleton() {
   return true;
       }
   
   @Override
       public void afterPropertiesSet() throws Exception {
           Set haps = this.parseHostAndPort();
           jedisCluster = new JedisCluster(haps, timeout);
       }
   
   public Integer getTimeout() {
   return timeout;
       }
   
   public void setTimeout(Integer timeout) {
   this.timeout = timeout;
       }
   
   public String getCluster() {
   return cluster;
       }
   
   public void setCluster(String cluster) {
   this.cluster = cluster;
       }
   }
   从代码中可以看出我们并没有提供连接池这样的概念，实际上JedisCluster自己维护了一个连接池，可以看GenericObjectPoolConfig源码
   注意，pom中的jedis版本必须在2.7.2及以上版本，这个版本以上才支持JedisCluster

   新建redis-cluster.properties，内容如下：
   

   # redis jedis version 2.7.2
   redis.cluster=192.168.88.140:6378,192.168.88.140:6379,192.168.88.143:6378,192.168.88.143:6379,192.168.88.145:6378,192.168.88.145:6379
   redis.timeout=300000
   新建redis-cluster.xml，内容为：
   

   xml version="1.0" encoding="UTF-8"?>
   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:p="http://www.springframework.org/schema/p" xmlns:c="http://www.springframework.org/schema/c"
     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">
   
     id="jedisClusterFactory" class="xxx.disconf.demo.service.JedisClusterFactory">
       name="cluster" value="${redis.cluster}" />
       name="timeout" value="${redis.timeout}" />
     
   
   

   那么我们使用的时候注入jedisClusterFactory就可以使用了，这个bean比较轻，不需要依赖别的bean，所以之前提到的disconf中修改了redis的配置后相应的jedisClusterFactory也会重新flush成新的bean
   

参考： https://github.com/knightliao/disconf/wiki