[erlang-questions] OTP Design

Thu Aug 18 21:45:26 CEST 2011

STOMP is another messaging option: http://stomp.github.com/

On Thu, Aug 18, 2011 at 2:46 PM, Kunthar <kunthar@REDACTED> wrote:
> I strongly recommend to read Erlang and OTP in Action.
> http://www.manning.com/logan/
> It would be needed to have a concrete idea.
> On Thu, Aug 18, 2011 at 9:01 PM, Anchise Inzaghi <erlang@REDACTED> wrote:
>> I am quite new to erlang and now on the first step to my first application
>> in our actual production environment. I surely want to make use of the OTP
>> framework. I have played a bit with it, read the documentation and Joe
>> Armstrong's book. I am still unsure about the design. I hope you can help me
>> out and give me some precious input.
>> The setup is the following:
>> 1 DB-Server somewhere in the internet,
>> 1 Comm-Server in our local LAN with static public IP and static LAN IP,
>> n Comm-Slaves in our local LAN with static LAN IPs and each with a number of
>> different devices attached.
>> Comm-Server and Comm-Slaves suffer from frequent blackouts and power surges,
>> so they fall down and reboot quite a lot.
>> The LAN is stable, the internet connection (of our LAN, not of the
>> DB-Server) is the worst connection you can possibly imagine.
>> Each Comm-Salve has one process for each of its comm devices attached which
>> receive data from these devices. When it receives data I want them to pass
>> this data to the Comm-Server, the Comm-Server then writes them to the
>> persistence layer (postgres), does some preprocessing and then sends it to
>> the central DB-Server. If there is no internet connection, it should wait
>> until he sees the DB-Server again and send the buffered data then.
>> The DB-Server, Comm-Server and Comm-Salves I imagined would be of the
>> behaviout gen_server. The Comm-Server starts up with an ini-File indicating
>> which Node on which Slave controlles which devices, and start up the
>> corresponding Comm-Slaves on the indicated nodes, passing them the
>> information of which devices to controll.
>> The Comm-Server will also have some interface for adding and removing
>> devices (i.e. processes receiving data from devices).
>> If a Comm-Slave process dies, I need to restart it one-on-one. I thought
>> about a supervisor on the Comm-Server to supervise all the Salves and here
>> comes my first problem:
>> **As I read the documentation, there is no way to start_link a process on a
>> different node, or am I missing something?**
>> **What supervision strategy would you suggest?**
>> I also dived a bit into distributed application docu, but I have the
>> impression that it is more aimed at Takeover and Failover mechanisms. I
>> fear, these won't help me much, as each slave can only run on the machine
>> where its actual hardware device is connected.
>> **Please prove me wrong and show me the way how to use ditributed app?**
>> I will be thankful for any indications how to sensefully use OTP with this
>> setup.
>> Thanks a lot in advance.
>> Anchise Inzaghi
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> --
> BR,
> \|/ Kunthar
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