来自数据库和属性的Spring配置属性

Question

I asked a similar question, but based on the responses, I did a bad job describing what I am after. I have a spring 4 webapp that loads properties from a properties file. We consume those properties both via the "${proper.name"} expressions in spring, as well as by injecting a properties object into some of our classes.

We want to move most of the properties to a database table and make them reloadable. However, a few need to stay in local properties, potentially overriding the database setting. These should also be loaded dynamically after the app is running.

I know that once a particular bean is injected, it won't get reloaded, that doesn't concern me, it's up to that module to handle that. But I am having trouble getting the behavior I want. In particular, I have implemented an AbstractConfiguration from apache commons configuration to get the dual source and overriding I am after. But while it works for injecting the properties object, expressions loaded with "${prop.name}" don't work at all.

How can I get them to work? Did I override the wrong thing? Is it just some config detail?

<bean id="sysProperties" class="org.springframework.beans.factory.config.MethodInvokingFactoryBean">
    <property name="targetObject" ref="databaseConfigurator" />
    <property name="targetMethod" value="getProperties"/>
</bean> 

<bean id="databaseConfigurator" class="my.util.config.MyDatabaseConfigurator">
    <property name="datasource" ref="dataSource" />
    <property name="propertyFile" value="/WEB-INF/my.properties" />
    <property name="applicationName" value="ThisApp" />
</bean>

<bean id="dbConfigFactory" class="org.apache.commons.configuration.ConfigurationConverter" factory-method="getProperties">
    <constructor-arg ref="databaseConfigurator" />
</bean> 

Answer 1

I haven't tested this, but I think it might work.

<bean id="sysProperties" class="org.springframework.beans.factory.config.MethodInvokingFactoryBean">
    <property name="targetObject" ref="databaseConfigurator" />
    <property name="targetMethod" value="getProperties"/>
</bean> 

<bean id="databaseConfigurator" class="my.util.config.MyDatabaseConfigurator">
    <property name="datasource" ref="dataSource" />
    <property name="propertyFile" value="/WEB-INF/my.properties" />
    <property name="applicationName" value="ThisApp" />
</bean>



<bean name="PropertyPlaceholderConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
    <property name="properties" ref="CommonsConfigurationFactoryBean"/>
</bean>

<bean name="CommonsConfigurationFactoryBean" class="org.springmodules.commons.configuration.CommonsConfigurationFactoryBean">
       <constructor-arg ref="databaseConfigurator"/>
</bean>