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| mahandler |
 Posted: Tue Apr 29, 2008 9:38 pm |
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Joined: 23 Apr 2008
Posts: 5
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The current application I am working on is similar to a general chat server except that chatrooms have a shared xml state that the users can perform all sorts of actions on. I initially set this up as a gen_server where the state of the server is the xml and the list of the users in the "chatroom." My intent was that once this was done, i could then have a supervisor control the spawning of multiple gen_server's for different groups of clients. It turns out this is the wrong approach, and now I am thinking that what i should do is have another gen_server that controls the functionality of spawning/managing the chatrooms, and in turn spawns a supervisor and registers each spawned chatroom gen_server with that supervisor. As far as I can tell this will work the way I want it to, but I wanted to see if anyone had any tips for this kind of problem.
More generally, what is the OTP style solution when you want to have a gen_server that controls other gen_servers (with more functionality than a supervisor)? |
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| francesco |
| Posted: Mon Jun 02, 2008 12:00 pm |
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Joined: 07 Jul 2006
Posts: 249
Location: London
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From your gen_server, spawn new processes calling process_lib:spawn_link. Make sure you link yourself to the parent, because if your application is restarted, you might end up with zombie processes. This might not appear as a problem at first, but think that Erlang programs run years and years without being stopped. Zombie processes would cause a memory leak, forcing you to restart the whole system. Linking to the parent would allow you to fix the bug by restarting the parent only.
Francesco
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http://www.erlang-consulting.com |
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