[erlang-questions] Generic server and state recovery

[Edmond Begumisa]

You could implement this functionality in to your gen_server (that is  
trapping exits) using the terminate callback, persisting the state for  
recovery later or sending it to another process just before the gen_server  
process itself exits...

init() ->
    process_flag(trap_exit, true),
    ...

terminate(normal, State) ->
    ignore;
terminate(_Crash, State) ->
    ok = save_crashing_state(State),
    ignore.

save_crashing_state(State) ->
    % do something with State
    ...

- Edmond -


On Wed, 08 Dec 2010 22:29:40 +1100, Alessandro Sivieri  
<alessandro.sivieri@REDACTED> wrote:

> 2010/12/8 Edmond Begumisa <ebegumisa@REDACTED>
>
>> By "recover", do you mean after an abnormal exit?
>>
>>
> Yes, for example after a crash, when the supervisor restarts the  
> process...
>


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