[jboss-dev-forums] [Design the new POJO MicroContainer] - Re: Handling contexts in error

[adrian@jboss.org]

"julien at jboss.com" wrote : 
  | Please try to get an answer understandable by someone that has little knowledge about MC.

This isn't really an MC question, it's a programming patterns question :-)
The answer is to use a factory/singleton pattern.

e.g. These two would use the object constructed by MyFactory
(which can also be an instance class rather than the shown static method).

  | <bean name="Bean1">
  |    <constructor factoryClass="MyFactory" factoryMethod="getInstance"/>
  | </bean>
  | 
  | <bean name="Bean2">
  |    <constructor factoryClass="MyFactory" factoryMethod="getInstance"/>
  | </bean>
  | 
  | ALTERNATIVE:
  | 
  | If you don't like the boiler plate of coding a singleton factory, 
  | I wrote an aspect that does it for you:
  | http://viewvc.jboss.org/cgi-bin/viewvc.cgi/jbossas/projects/aop/trunk/aspects/src/main/org/jboss/aspects/patterns/singleton/Singleton.java?revision=63048&view=markup
  | which I guess could also be configured with an annotation (although it doesn't exist currently).
  | 
  | 
  |   | <bind pointcut="execution(@com.acme.Singleton->new())">
  |   |      <advice name="constructorAdvice" aspect="Singleton"/>
  |   | </bind>
  |   | 
  |   | @com.acme.Singleton
  |   | public class MyBean {}
  |   | 
  | 
  | I'm sure you can adapt it to your needs if it doesn't do exactly what you want. ;-)

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