[erlang-questions] process hierarchy and passing references

Schneider schneider@REDACTED
Thu Aug 14 17:47:15 CEST 2014

Right, thanks. Looks good.
So simple, as always.


> Op 14 aug. 2014 om 17:16 heeft Ladislav Lenart <lenartlad@REDACTED> het volgende geschreven:
> Hello again.
>> On 14.8.2014 17:00, Ladislav Lenart wrote:
>> Hello.
>> What about the following solution:
>> * Put all three processes under one supervisor.
>> * Set its restart strategy to one_for_all.
> Or rest_for_one. This one may better suite your needs. For more info, refer to
> the official documentation at: http://www.erlang.org/doc/man/supervisor.html
>> * Pass supervisor's PID to its children.
>> * Each worker process can lookup PID of its relevant sibling via
>> supervisor:which_children/1.
> HTH,
> Ladislav Lenart
>>> On 14.8.2014 16:48, Schneider wrote:
>>> Hi list,
>>> Since I am very new to Erlang, I am not sure how to layout process 
>>> hierarchies in the following case:
>>> Besides the domain specific functionality, every program has a RPC 
>>> middleman and an XML-RPC interface, each implemented as gen_servers. In 
>>> the current setup, the main gen_server process starts the RPC middleman, 
>>> passing it its Pid, and the RPC gen_server starts the XML-RPC server 
>>> which is passed the RPC middleman's Pid.
>>> Using the passed in Pid's, the XML-RPC server can do a 
>>> gen_server:call()/cast() back to the RPC server which on its turn can 
>>> call the main server. Works ok, but I would like to have the RPC 
>>> middleman and XML-RPC controller under the control of a supervisor. The 
>>> main supervisor should start the main gen_server process plus a 
>>> supervisor that on its turn should start the RPC midleman and the 
>>> XML-RPC handler.
>>> The thing I can't figure out is how the XML-RPC process should find the 
>>> RPC middleman process and how that process should locate the main server 
>>> when using supervision. Since there can be many RPC middlemen and 
>>> XMP-RPC servers around, each belonging to different main servers, naming 
>>> and registering seems a little hard.
>>> So how to pass references around?
>>> Any help will be very much appreciated.
>>> Frans
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