Active Modules / Active Objects

• Any module or application can be converted into an ``active module'' (active object) by using a special form of save:
  :- save_active_module(name_server, Addr, Addr Hook).
  (Addr Hook is code to report Addr).

• Procedures can be imported from remote ``active modules'' via a simple declaration: E.g.
  :- use_active_module(name_server, [get_address/2]).

• Calls to such imported procedures are then executed remotely in a transparent way.

• No need for code management, global state, etc. to be kept coherent.

• Example application: client-server. Client imports module which exports the functionality provided by server. Access is transparent from then on.

• Typical examples of active objects: databases, name servers, agendas, demons (ftp, telnet, ...), etc.