RE: [Springframework-developer] AutoProxyCreator problem

[Kopylenko, D. <dko...@ac...>]

I guess this could also be solved with source-level metadata and
'enterpriseservices' aouto proxy creation mechanism. Anyone, comments?

Dmitriy.

-----Original Message-----
From: Rajeev Kaul
To: spr...@li...
Sent: 11/19/2003 7:33 PM
Subject: Re: [Springframework-developer] AutoProxyCreator problem

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="prototypeBean" class="xyz.BusLogicBean" singleton="false"> 

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

</bean>

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


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

</bean>

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

<property
name="interceptorNames"><value>prototypeInvokerInterceptor</value></prop
erty>

</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="prototypeBean" class="xyz.BusLogicBean" singleton="false"
proxy="prototype"> 

<property name="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 ----- 
From: Rajeev Kaul <mailto:Ra...@cu...>  
To: spr...@li...
<mailto:spr...@li...>  
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). 
 
Rajeev Kaul