disconf实践（三）基于XML的分布式配置文件管理，自动reload

上一篇介绍了基于xml的非自动reload的分布式配置文件管理，这一篇介绍自动reload的方式（基于disconf实践二）。

1. 修改RedisConfig.java

 package org.springinaction.weather.config;

 public class RedisConfig {

     private String host;

     private String port;

     public String getHost() {
         return host;
     }

     public String getPort() {
         return port;
     }

     public void setHost(String host) {
         this.host = host;
     }

     public void setPort(String port) {
         this.port = port;
     }

 }

2. 新增回调

 package org.springinaction.weather.config.callback;

 import org.springframework.stereotype.Component;

 import com.baidu.disconf.client.common.annotations.DisconfUpdateService;
 import com.baidu.disconf.client.common.update.IDisconfUpdate;

 @Component
 @DisconfUpdateService(confFileKeys = { "redis.properties" })
 public class RedisConfigCallback implements IDisconfUpdate {

     @Override
     public void reload() throws Exception {
     }

 }

3. 修改spring配置文件

 <?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"
     xsi:schemaLocation="http://www.springframework.org/schema/beans
         http://www.springframework.org/schema/beans/spring-beans-4.3.xsd
         http://www.springframework.org/schema/context
         http://www.springframework.org/schema/context/spring-context-4.3.xsd">

     <!-- 使用disconf必须添加以下配置 -->
     <bean id="disconfMgrBean" class="com.baidu.disconf.client.DisconfMgrBean"
         destroy-method="destroy">
         <property name="scanPackage" value="org.springinaction.weather.config" />
     </bean>
     <bean id="disconfMgrBean2" class="com.baidu.disconf.client.DisconfMgrBeanSecond"
         init-method="init" destroy-method="destroy">
     </bean>

     <!-- 使用托管方式的disconf配置(无代码侵入, 配置更改会自动reload) -->
     <bean id="configproperties_reloadable_disconf"
         class="com.baidu.disconf.client.addons.properties.ReloadablePropertiesFactoryBean">
         <property name="locations">
             <list>
                 <value>redis.properties</value>
             </list>
         </property>
     </bean>

     <bean id="propertyConfigurer"
         class="com.baidu.disconf.client.addons.properties.ReloadingPropertyPlaceholderConfigurer">
         <property name="ignoreResourceNotFound" value="true" />
         <property name="ignoreUnresolvablePlaceholders" value="true" />
         <property name="propertiesArray">
             <list>
                 <ref bean="configproperties_reloadable_disconf" />
             </list>
         </property>
     </bean>

     <bean id="redisConfig" class="org.springinaction.weather.config.RedisConfig">
         <property name="host" value="${redis.host}" />
         <property name="port" value="${redis.port}" />
     </bean>
 </beans>

修改之后，在管理端修改redis.properties的配置信息时，应用会自动reload并修改相应的参数。