Multiple Hibernate Entity Interceptors?

[irbouho]

rmangi,

If I understand what you said, deciding what interceptor to use depends on the entity and method called.

So lets configure our interceptors as plain POJOs

  <bean id="interceptor1" class="Interceptor1"/> 
  <bean id="interceptor2" class="Interceptor2"/> 
  ...

Now we create the uber-interceptor with a property of type map that holds the (entity, interceptor) pairs

  <bean id="myInterceptor" class="MyInterceptor">
    <property name="interceptors">
      <entry key="entity1"> 
       <value>interceptor1</value>
      </entry> 
      <entry key="entity2"> 
       <value>interceptor2</value>
      </entry> 
    <property>
  </bean>

myInterceptor will lookup the interceptor to be used for each call using the interceptors map:

  public class MyInterceptor implements Interceptor, Serializable {

    private map interceptors;
    //getters and setters

    ...

    public void onDelete(Object entity,
                         Serializable id,
                         Object[] state,
                         String[] propertyNames,
                         Type[] types) {
        Interceptor interceptor = resolveInterceptor(entity);
        if (interceptor != null)
          interceptor.onDelete(entity, id, state, propertynames, types);
    }

    ...

    //interceptor resolver
    private Interceptor resolveInterceptor(Object entity) {
      //uses property interceptors, if not found returns null
      ...
      return interceptor;
    }
  }

I did not try this solution before, but It seems extensible.

[rmangi]

Yes, that's pretty much where I'm headed right now. I'd like it to be smart enough to be aware of which methods a particular interceptor is overriding to avoid extra method calls (although they would be quick if they just return null). I'd also like it to be able to call two interceptors in the case where there may be more than 1 interceptor interested in a particular method call (not currently the case, but in the interest of the best possible solution...)

None of this is rocket science, it just seems like a duplication of a lot of the functionality offered in other packages in spring, but not available for the hibernate entity interceptors. That's really my reason for asking about this.

Thanks,

Rick

[kajism]

This may be useful:
http://www.hibernate.org/92.html
http://wiki.opensymphony.com/display...ng+Interceptor

[rmangi]

This may be useful:
http://www.hibernate.org/92.html
http://wiki.opensymphony.com/display...ng+Interceptor

Thanks. Good to see others have thought about this problem.