Extending Spring with new Schema

[magott]

Hi,

I'm trying to extend Spring, and in the process supply a new schema.

Here's the background (reason) for my extension. I want to extend the SimpleRemoteStatelessSessionProxyFactoryBean to allow a list of MethodInterceptors to be set. These interceptors should be called before the proxy is called (and subsequently the EJB). I'm using these interceptors to move context from a local thread into a request context.

So I've made an extension of RemoteStatelessSessionBeanDefinitionParser (which actually can't be extended, as it for some reason is package private. so I had to extend AbstractSingleBeanDefinitionParser and duplicate the business logic from the subimplementations) and a separate NamespaceHandler.

So, here's the issue. I have to implement the postProcess to process the custom element I have called "method-interceptors". It's defined like this in my xsd:

<xsd:element name="method-interceptors"  minOccurs="0" maxOccurs="1">   
  <xsd:complexType> 
    <xsd:sequence>                                          
      <xsd:element ref="beans:list"/> 
    </xsd:sequence>                                         
  </xsd:complexType> 
</xsd:element>

My context.xml:

....(part of remote-slsb-extension)...
<myscema:method-interceptor>
   <list><bean ref="myInterceptorBean"/></list>
</myscema:method-interceptor>
..

This is my postProcess-code:

       
protected void postProcess(BeanDefinitionBuilder definitionBuilder, Element element) { 
                NodeList childNodes = element.getChildNodes(); 
                for (int i = 0; i < childNodes.getLength(); i++) { 
                        Node node = childNodes.item(i); 
if(METHOD_INTERCEPTORS.equals(node.getLocalName())){ 
                                //Get the listNode 
                                Node listNode = node.getFirstChild(); 
                                NodeList interceptors = listNode.getChildNodes(); 
                                //TODO: Implement
                        } 
                } 
        }

At the todo, I want to get the List of bean-refs that is in my context.xml and set it on my bean. But I can't figure out how. The parameters provided through the method doesn't really help me. Obviously, I'm just being stupid...but instead of waisting more time trying to find out this myself I thought I'd give the forum a go. Basically what I want is a way to convert this nodeList into a javalist and set it on my bean instance...

[Dave Syer]

I think what you need is probably a BeanDefinitionParserDelegate - you can use it to embed beans namespace elements inside a custim namespace.

[magott]

I think what you need is probably a BeanDefinitionParserDelegate - you can use it to embed beans namespace elements inside a custim namespace.

Well that class isn't documented very well, and the usage is even worse documented.

Can you provide me some example code, and tell me which method I should hook into from the AbstractSimpleBeanDefinitionParser to where the necessary variables are available?