Lorenzo Puccetti's Blog: A Dynamic Language For Bean Factory

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Lorenzo Puccetti's Blog

Main | Can XML capture the Dependency Injection pattern ? »

A Dynamic Language For Bean Factory

Posted by unoinpiu on November 30, 2006 at 12:47 PM | Comments (5)

A Dynamic Language For BeanFactory

A Dynamic Language For BeanFactory.

One of the things I like the most about the Spring-IOC-container is its non-intrusiveness. I can write my classes, test them and then, only when I come to assemble them, use Spring. For this final step, I use the XmlBeanFactory (the most commonly used implementation of the BeanFactory) and write an xml file like this:

<beans>
   <bean id="timerService"    class="foo.core.TimerService"/>
   <bean id="locationService" class="foo.core.LocationService" />
   <bean id="currencyExchangeService" class="foo.core.CurrencyExchangeService">
      <property name="currencies">
         <set>
            <value>EUR</value>
            <value>GBP</value>
            <value>USD</value>
         </set>
      </property>
   </bean>
   <bean id="serviceManager"  class="foo.core.ServiceManager">
      <property name="services">
         <set>
            <ref bean="timerService" />
            <ref bean="locationService" />
            <ref bean="currencyExchangeService" />
         </set>
      </property>
   </bean>
   <bean id="encoder" class="foo.core.Encoder">
      <property name="mode" value="UTF-8"/>
   </bean>
   <bean id="server" class="foo.core.Server">
       <property name="host"    value="localhost" />
       <property name="port"    value="9999" />
       <property name="encoder" ref="encoder" />
       <property name="serviceManager" ref="serviceManager" />
   </bean>
</beans>

This file is generally easy to understand and mantain. Besides the Spring-IDE makes my job easier and there are several articles on best practices on how to write a Spring xml file.

Yet, I can't stop wondering about a new BeanFactory which uses one of the many scripting languages for java to make this job simpler (and to an extent more natural). Let me give you an example. If I were to use Rhino (popular javascript engine for java) my configuration file could look like this:

var timerService = new foo.core.TimerService();

      var locationService = new foo.core.LocationService();

      var currencyExchangeService = new foo.core.CurrencyExchangeService();

      {  // curly brackets ensure an unreachable scope for 'set'.

         var set = new HashSet(); 

         set.add("EUR");

         set.add("GBP"); 

         set.add("USD"); 

         currencyExchangeService.add(set); 

      }

      var serviceManager = new foo.core.ServiceManager();

      {  // curly brackets ensure an unreachable scope for 'set'.

         var set = new HashSet(); 

         set.add( timerService );

         set.add( locationService ); 

         set.add( currencyExchangeService ); 

         currencyExchangeService.add(set); 

      }

      var encoder = new foo.core.Encoder();

encoder.setMode(

"UTF-8");

 var server = new foo.core.Server(); 

      server.setHost("localhost");

      server.setPort(9999);

      server.setEncoder(encoder);

      server.setServiceManager(serviceManager);

      

      // 'native' objects could be used to indicate the scope of the beans

      __scriptFactory.setBeanScope(server,"SINGLETON");

It is your call to think which approach reads better.

Of course, writing this RhinoScriptBeanFactory would present new challenges. For example, we should probably limit the scripting capabilities neither to have conditional statements nor loops but allow just that bit of functionality that encourages the Dependency Injection pattern and nothing more.

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Comments

Comments are listed in date ascending order (oldest first) | Post Comment

I think if you're going to do this, at least make it more natural, like:

server.host="localhost";
server.port=9999

and so on.

Unfortunately, javascript doesn't have the concept of a set, as such, but a bit of guessed coercion like this might be nicer:

currencyExchange.add(["EUR","GBP","USD"]);

ie. convert the javascript array to a Set.

Personally, I prefer the XML format though. Stops anyone who has to support it later from wondering what on earth you've done :-)

Posted by: goron on November 30, 2006 at 01:33 PM

Just had a thought.... given that Rhino supports E4X (although IIRC, not the bundled one with Java SE 6), you could mix the two styles up :-)

Posted by: goron on November 30, 2006 at 01:39 PM

Have a look at this blog entry by Rod Johnson: http://blog.interface21.com/main/2006/11/28/a-java-configuration-option-for-spring/. Does exactly what you want in pure Java - which means you can use any standard IDE to great effect instead of inventing yet another syntax.

Posted by: pcholakov on November 30, 2006 at 08:34 PM

Have a look at this blog entry by Rod Johnson: http://blog.interface21.com/main/2006/11/28/a-java-configuration-option-for-spring/. You can use your favourite Java IDE instead of inventing a new syntax.

Posted by: pcholakov on November 30, 2006 at 08:35 PM

Have a look at this blog entry by Rod Johnson: http://blog.interface21.com/main/2006/11/28/a-java-configuration-option-for-spring/. You can use your favourite Java IDE instead of inventing a new syntax.

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