“Recycling” names within a spring application context


“Recycling” names within a spring application context



lets say, I have a lot of stuff within my spring application context which looks like that

<bean name="foo.0001" class="com.example.MyClass">     <property name="name" value="foo.name.0001"/>     <property name="zap">         <bean class="com.example.Other">             <property name="name" value="foo.name.0001"/>         </bean>     </property>     <property name="bar">         <bean class="com.example.NextOther">             <property name="name" value="foo.name.0001"/>         </bean>     </property> </bean> 

so the string foo.name.0001 appears within the bean definition several times. Because it is a larger system with several blocks of this configuration, it is quite annoying to modify each of those ids. Ideally I would want to set it only once within a block. Is there a possibility to set some kind of property which exists only in a local scope of a bean definition?




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I'm not sure how that would logically work, as you would still have to reference that value somehow to pass it to the nested beans.


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If you are worried about defining it multiple times, you can have a look at Springs PropertyPlaceholderConfigurer.


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It will allow you to the following:.
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<property name="bar">    <bean class="com.example.NextOther">       <property name="name" value="${foo.name.001}"/>    </bean> </property> 
This would allow you to define it once, and reference it from multiple locations..
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It depends how much effort you want to put into to this but your requirements could be fufilled by a spring custom namespace.

These are ideal when you have lots of identical blocks of beans each configured differently.

. Basically you'd define the xml schema then write a bean definition parser that sets up the beans as required.. See here for more details:. http://www.javaworld.com/javaworld/jw-02-2008/jw-02-springcomponents.html. This is how Spring security simplified its xml configuration..



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