How to intercept associations

imsathya · **Joined:** Mon Nov 08, 2004 4:05 am **Posts:** 6

Hibernate version: 3.1

Friends,

I am trying to create an Audit interceptor to track all entity changes in the application. This also includes tracking all new associations.

I am having problems with intercepting unidirectional one-to-many association. I tried this with some simple entities to work on the problem. Here are the mapping files :

Mapping documents:

Class : Client

Code:

   <class name="com.test.Client" table="CLIENT" lazy="false">
      <id name="clientNumber" type="integer" unsaved-value="null" >
         <column name="clientNumber" not-null="true"/>
         <generator class="increment"/>
      </id>
      
      <property column="title" name="title" type="string" />
      <property column="lastName" name="lastName" type="string" not-null="true"/>
      <property column="firstName" name="firstName" type="string" not-null="true"/>

      <set name="references" inverse="false" cascade="delete">
         <key column="client_id" />
         <one-to-many class="Reference"/>
      </set>
   </class>

Class : Reference

Code:

   <class name="com.test.Reference" table="Reference" >
      <id name="id" type="integer" unsaved-value="null" >
         <column name="id" not-null="true"/>
         <generator class="increment"/>
      </id>
      
      <property column="name" name="name" type="string" not-null="true"/>
      
   </class>

Here is my test case :

Code:

   public void testUnidirectionalAssociation() {
      Client client = new Client();
      client.setClientNumber(null);
      client.setFirstName("Steve");
      client.setLastName("Jobs");
      client.setTitle("Mr");
      
      dao.persist(client); // Client object is saved and flushed

      Reference r = new Reference();
      r.setName("Client type");
      dao.persist(r); // Reference object is saved and flushed

      client.addReference(r);
      dao.persist(client);
   }

Now, my AuditInterceptor's onSave() method gets called when the Client and Reference objects are created. But when there is just an association change, the onFlushDirty() methods do not get called.

We do have an onCollectionUpdate() callback which however sends across the entire collection. How do we find the newly added (or the "dirty") entities ?

Any help on how to track such association changes please ?

Thanks so much.[/code]

beejal27 · **Joined:** Mon Sep 26, 2005 8:43 am **Posts:** 16

Can anyone reply to this post? I am also facing similar problem and do not know way out. I am using Hibernate 3.0.5 where in Interceptor doesn't have onCollectionUpdate API itself. So I decided to switch on to Hibernate 3.2.4.sp1 wherein onCollectionUpdate API of Interceptor provides with all the objects of a particular collection rather than the changed ones.

So I have a Student table and Student_Addresses table. One Student can have multiple addresses. This association is managed using idbag in the mapping file. I want to audit last when was the student address edited. So I have implemented the Interceptor to intercept calls to have latest timestamp on lastmodified column of Student_Addresses table before commit to database. But onCollectionUpdate API provides me with all the address of a particular student and not the changed ones.

Is there any other appropriate API for this purpose?