[jboss-dev-forums] [Design of EJB 3.0] - Re: [long read] Info/help needed on extending EJB3 container

[bill.burke@jboss.com]

EJB3 is built on JBoss AOP framework.  ALl the facilities you would need to do this are built in already.

You need:

1. A service that holds your routing information and matches it up to an EJBContainer.  EJB3 containers are all registered in org.jboss.ejb3.Ejb3Registry

2. a Server-side aspect that intercepts the invocation and reroutes the invocation.  You can add this aspect to all EJB containers by adding your aspect to the ejb3-interceptors-aop.xml file.  Server side AOP bindings are defined in various aspect domains in this file.

3. Use org.jboss.aop.metadata.ThreadMetaData class to associate contextual data with with the calling Thread.

4. Add the MergeMetaDataInterceptor to the client interceptor chains defined in ejb3-interceptors-aop.xml.  This interceptor must be defined before InvokeRemoteInterceptor in the interceptor stack definition.  What this interceptor will allow you to do is to pass contextual data you assigned with the ThreadMetaData class over the wire to the server.

5. The Server-side aspect would do Invocation.getMetaData(key, value) to obtain any contextual metadata you assigned through ThreadMetaData.

Hope this gives you some hints.

Bill

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