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< Open Telecom Platform (OTP) ~ Starting an included application using its own environment |
| LeHoff |
 Posted: Wed Sep 05, 2007 9:06 pm |
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Joined: 28 Nov 2006
Posts: 38
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I have an application simple_app that is started by calling
Code: simple_sup:start_link({Arg1,Arg2})
Being somewhat tidy at times I have placed the specifics of Arg1 and Arg1 in the env key of the simple_app.app file so that I can build the arguments by looking up values in the environment of the application.
Now I am in the situation that I need to use simple_app as part of a bigger application and looking at the documentation for doing so (http://www.erlang.org/doc/design_principles/included_applications.html#8) it states that...
Quote: "the top supervisor of the included application must be started by a supervisor in the including application."
This means that the nice and tidy start up I have created in the simple_app:start() function has to be duplicated in the top supervisor of the new application that includes simple_app.
Apart from annoying my natural laziness this "feature" seems to be at odds with normal structuring principles such as re-use and encapsulation.
Should I bite the bullet and - bugger, bugger, bugger  - copy the code over to the new top supervisor or is there a neat way out of this predicament?
Cheers,
Torben |
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| KatolaZ |
| Posted: Thu Sep 06, 2007 10:51 am |
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Joined: 04 Jul 2007
Posts: 5
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As far as I understand, you include your params in the environment of the application when you start it, right ?
The best way to it when your application is started by another process is setting those values into the application environment *before* starting the application itself. This can be done using application:set_env/3 or application:set_env/4, directly from the supervisor which is in charge of starting your application.
Hope this can help
HND
Enzo |
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| LeHoff |
| Posted: Fri Sep 07, 2007 9:02 am |
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Joined: 28 Nov 2006
Posts: 38
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I think I can see where you are headed.
My specific problem is that I have to start two C ports that I have created and I have created entries in the .app files like this:
Code:
{env, [{lapd_daemon, "lapd_daemon"},
{lapd_client_port, "lapd_client_port"}]}
In the .erl file for the application (when started on its own) I then figure out the specific path to the C object files like this:
Code:
PrivDir = code:priv_dir(mps_app),
DaemonName = case application:get_env(mps_app,lapd_daemon) of
{ok, DName } -> DName;
BadD -> exit({bad_config, {mps_app, {lapd_daemon, BadD}}})
end,
ClientName = case application:get_env(mps_app,lapd_client_port) of
{ok, CName } -> CName;
BadC -> exit({bad_config, {mps_app, {lapd_client_port, BadC}}})
end,
Daemon = filename:join([PrivDir, DaemonName]),
Client = filename:join([PrivDir, ClientName]),
mps_sup:start_link({Daemon, Client}).
So if I re-factored the last bit of code such that the Daemon and Client were instead put into the environment at start-up (thus getting the right paths to the object files on the target machine) I could then look up, say, lapd_deamon and lapd_client in the environment of that application when it is used as an included application, right?
This seems like a sensible way of putting the right amount of configuration into the .app file and then build the concrete environment when starting up.
I will implement this once I have gotten past the next milestone in our project since I did the nasty code cloning just to get on with the show.
Cheers,
Torben |
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| timrila |
| Posted: Tue Jun 12, 2012 9:06 am |
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| brandzclothes |
| Posted: Mon Jun 25, 2012 4:07 pm |
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| wuji |
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