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< Open Telecom Platform (OTP) ~ How to find a child process efficiently in a supervisor? |
| diyu01 |
 Posted: Wed Aug 19, 2009 6:16 pm |
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Joined: 19 Aug 2009
Posts: 7
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Hi, I am new to Erlang/OTP and am trying to implement a process that maintains a (dynamic) list of child processes in a supervisor way, and is able to get messages like {ChildName, RealMessage} from outside, and find a child process based on the child name and then pass "RealMessage" to that child process.
The child processes are all similar, but the number is dynamic and might be quite large, so I am planning to use simple_one_for_one strategy in the process. But in that case, how should I register the name->child mapping in the supervisor? I do not see anything like an "internal state" in the supervisor behaviour, and if I use supervisor:which_children and loop through the returned list, it would not only be potentially too slow but also still cannot provide the name->child mapping, since for simple_one_for_one supervisors there is no "ID" for newly added child.
So how should I implement this? Thanks! |
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| uwiger |
| Posted: Wed Aug 19, 2009 8:03 pm |
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Joined: 03 Jul 2006
Posts: 604
Location: Sweden
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diyu01 wrote: Hi, I am new to Erlang/OTP and am trying to implement a process that maintains a (dynamic) list of child processes in a supervisor way, and is able to get messages like {ChildName, RealMessage} from outside, and find a child process based on the child name and then pass "RealMessage" to that child process.
The rule regarding supervisors is that they do one thing, and one thing only: supervise processes. The only user code that's allowed to run inside a supervisor is either in the init phase or the start function of the child process. The rest, you don't get to touch.
If you want to dispatch messages to processes, you can use something like proc_reg in jungerl, or roll your own: a process that keeps a dictionary mapping child names to pids. Don't mix it up with supervision, if you can help it.
BR,
Ulf W |
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| wuji |
| Posted: Sat Aug 11, 2012 1:46 am |
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