Interceptors are used to mainly intercept a save or flush. To define a Interceptor we have to implement the
Interceptor interface.However extending the EmptyInterceptor class helps as it gives you the basic implementations of the needed functions.
Session:
the session used by the interceptor should be independent of the session on which the interceptor is working on.
Adding Interceptors
On Session:
The Interceptor need not be thread safe.
The interceptor is added to the sessions as [sessionFactory.openSession(interceptor)]
On SessionFactory:
The Interceptor needs to be thread safe as it works with instance objects.
The interceptor is added using the Configuration before the sessionFactory is build.