Re: [Springframework-developer] AutoProxyCreator problem

[Rajeev K. <Ra...@cu...>]

I am thinking of a solution for condensing the verbose configuration =
(shown below) for prototype business logic beans I am using in my =
application.  A shared controller instance (singelton) creates the =
business logic bean.  However the business logic bean must be =
instantiated per each thread that runs through the shared controller.  I =
have been using the configuration shown below:


<bean id=3D"prototypeBean" class=3D"xyz.BusLogicBean" =
singleton=3D"false">=20

<property name=3D"count"><value>10</value></property>

</bean>



<bean id=3D"prototypeInvokerInterceptor" =
class=3D"org.springframework.aop.interceptor.PrototypeInvokerInterceptor"=
>=20

<property =
name=3D"targetBeanName"><value>prototypeBean</value></property>

</bean>


<bean id=3D"prototype" =
class=3D"org.springframework.aop.framework.ProxyFactoryBean">=20

<property =
name=3D"interceptorNames"><value>prototypeInvokerInterceptor</value></pro=
perty>


</bean>



As you can see this is very verbose, especially if you have a lot of =
these business logic beans in your application.  I tried using a derived =
version of BeanNameAutoProxyCreator to solve this, but ran into =
problems. I would like to replace this configuration with something =
shown below:



<bean id=3D"prototypeBean" class=3D"xyz.BusLogicBean" =
singleton=3D"false" proxy=3D"prototype">=20

<property name=3D"count"><value>10</value></property>

</bean>

This would involve adding a "PROXY" attribute which would specify the =
type of proxy interceptor desired for the bean.  For example, =
"prototype" would mean ProxyFactoryBean with =
PrototypeInvokerInterceptor, "default" would mean ProxyFactoryBean with =
InvokerInterceptor, etc.  In loadBeanDefinition() method of the =
XmlBeanFactory class, the supporting proxy classes (ProxyFactoryBean  =
and PrototypeInvokerInterceptor) could be automatically generated and =
registered.

Any suggestions, comments, ...?



Rajeev

  ----- Original Message -----=20
  From: Rajeev Kaul=20
  To: spr...@li...=20
  Sent: Tuesday, November 18, 2003 1:29 PM
  Subject: [Springframework-developer] AutoProxyCreator problem


  I have been trying to use BeanNameAutoProxyCreator class (I noticed =
there are no test cases for it) to create proxies for "prototype" =
business objects. I extended the BeanNameAutoProxyCreator class to use =
the PrototypeInvokerInterceptor in the "createInvokerInterceptor()" =
method.  However, this results in an infinite loop, as the =
PrototypeInvokerInterceptor calls the beanFactory getBean() method which =
in turn triggers the beanPostProcessor and the cycle repeats endlessly.

  Any suggestions on getting around this problem?

  It would have been better, if the BeanNameAutoProxyCreator class was =
designed to take invokerInterceptor as a property, which could be =
specified in the configuration, instead of having to subclass it to use =
other invokerInterceptor(s).=20

  Rajeev Kaul