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We have more than one chain of interceptors, to cover all the different operations 

Using an interceptor for Mitosis 

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The main problem is that we should guarantee an ACID transaction , which means that we must set a lock on the object  until it has been managed by the nexus.

Add Entry operation

Suppose that we add an entry E_i in the serveur S_i at time T_i, and that we have to propagate this change to server S_k.

This operation will have to deal with those followong cases :

1. The server S_k is not responding
2. The entry E_i already exist in serveur S_k
3. The entry E_i does not exist in serveur S_k
4. The entry E_i has already been created on another server S_n at T_x where T_x < T_i
5. The entry E_i has been created on another server S_n at T_x where T_x > T_i

The third case is the most general case.