上一篇介紹了基於xml的非自動reload的分布式配置文件管理，這一篇介紹自動reload的方式（基於disconf實踐二）。

1. 修改RedisConfig.java

 1 package org.springinaction.weather.config;
 2 
 3 public class RedisConfig {
 4 
 5     private String host;
 6 
 7     private String port;
 8 
 9     public String getHost() {
10         return host;
11     }
 
12 
13     public String getPort() {
14         return port;
15     }
16 
17     public void setHost(String host) {
18         this.host = host;
19     }
20 
21     public void setPort(String port) {
22         this.port = port;
23     }
24 
25 }

2. 新增回調

 1 package org.springinaction.weather.config.callback;
 
 2 
 3 import org.springframework.stereotype.Component;
 4 
 5 import com.baidu.disconf.client.common.annotations.DisconfUpdateService;
 6 import com.baidu.disconf.client.common.update.IDisconfUpdate;
 7 
 8 @Component
 9 @DisconfUpdateService(confFileKeys = { "redis.properties" })
10 public class RedisConfigCallback implements
 
 IDisconfUpdate {
11 
12     @Override
13     public void reload() throws Exception {
14     }
15 
16 }

3. 修改spring配置文件

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <beans xmlns="http://www.springframework.org/schema/beans"
 3     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
 4     xsi:schemaLocation="http://www.springframework.org/schema/beans
 5         http://www.springframework.org/schema/beans/spring-beans-4.3.xsd
 6         http://www.springframework.org/schema/context
 7         http://www.springframework.org/schema/context/spring-context-4.3.xsd">
 8 
 9     <!-- 使用disconf必須添加以下配置 -->
10     <bean id="disconfMgrBean" class="com.baidu.disconf.client.DisconfMgrBean"
11         destroy-method="destroy">
12         <property name="scanPackage" value="org.springinaction.weather.config" />
13     </bean>
14     <bean id="disconfMgrBean2" class="com.baidu.disconf.client.DisconfMgrBeanSecond"
15         init-method="init" destroy-method="destroy">
16     </bean>
17 
18     <!-- 使用托管方式的disconf配置(無代碼侵入, 配置更改會自動reload) -->
19     <bean id="configproperties_reloadable_disconf"
20         class="com.baidu.disconf.client.addons.properties.ReloadablePropertiesFactoryBean">
21         <property name="locations">
22             <list>
23                 <value>redis.properties</value>
24             </list>
25         </property>
26     </bean>
27 
28     <bean id="propertyConfigurer"
29         class="com.baidu.disconf.client.addons.properties.ReloadingPropertyPlaceholderConfigurer">
30         <property name="ignoreResourceNotFound" value="true" />
31         <property name="ignoreUnresolvablePlaceholders" value="true" />
32         <property name="propertiesArray">
33             <list>
34                 <ref bean="configproperties_reloadable_disconf" />
35             </list>
36         </property>
37     </bean>
38     
39     <bean id="redisConfig" class="org.springinaction.weather.config.RedisConfig">
40         <property name="host" value="${redis.host}" />
41         <property name="port" value="${redis.port}" />
42     </bean>
43 </beans>

修改之後，在管理端修改redis.properties的配置信息時，應用會自動reload並修改相應的參數。

disconf實踐（三）基於XML的分布式配置文件管理，自動reload