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< Erlang questions mailing list ~ Problem with socket-based distribution example in the "Progr |
| mberrow |
 Posted: Sun Aug 05, 2007 9:26 pm |
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User
Joined: 20 May 2007
Posts: 14
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Hi,
I am trying to following along with Joe's tutorial on socket-based distribution from "Programming
Erlang" book.
On page 190 we are asked to start the name server (and the module kvs).
So in the first session, I set up my environment, then do as asked.
Eshell V5.5.4 (abort with ^G)
1> os:putenv("HOME","C:\\Documents and Settings\\mberrow").
true
2> code:add_patha("./socket_dist").
true
3> kvs:start().
true
4> lib_chan:start_server().
lib_chan starting:"C:\\Documents and Settings\\mberrow/.erlang_config/lib_chan.conf"
ConfigData=[{port,1234},
{service,nameServer,
password,
"ABXy45",
mfa,
mod_name_server,
start_me_up,
notUsed}]
true
That looks happy. And it has found the config file (placed as directed).
So (as directed) I start up the second session (1st adding "./socket_dist" to my code path)
as follows:
Eshell V5.5.4 (abort with ^G)
1> code:add_patha("./socket_dist").
true
2> {ok, Pid} = lib_chan:connect("localhost", 1234, nameServer, "ABXy45", "").
{ok,<0.34.0>}
That looked OK, but immediately in the 1st session, I get
5> server error:{undef,[{mod_name_server,start_me_up,[<0.40.0>,[],notUsed]},
{lib_chan,really_start,3}]}
And there I am stuck.
but mod_name_server.beam is sitting right there in ./socket_dist dir with all the others.
Why am I getting 'undef' ?
-- Mike Berrow
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| mberrow |
| Posted: Mon Aug 06, 2007 2:41 am |
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User
Joined: 20 May 2007
Posts: 14
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Aha!! ... that was it.
the beam file for mod_name_server in the zip file I downloaded for the book did not
correspond to the source. It had 'startMeUp' in the beam file (the mod_name_server.erl
file and the config file has 'start_me_up').
4> l(mod_name_server).
{module,mod_name_server}
5>
5> mod_name_server:
module_info/0 module_info/1 startMeUp/3
...
re-compiling ...
2> c(mod_name_server).
{ok,mod_name_server}
...
8> mod_name_server:
module_info/0 module_info/1 start_me_up/3
Now it works as prescribed.
2> {ok, Pid} = lib_chan:connect("localhost", 1234, nameServer, "ABXy45", "").
{ok,<0.34.0>}
3> lib_chan:cast(Pid, {store, joe, "writing a book"}).
{send,{store,joe,"writing a book"}}
4> lib_chan:rpc(Pid, {lookup, joe}).
{ok,"writing a book"}
5> lib_chan:rpc(Pid, {lookup, jim}).
undefined
6>
Thanks much. I'll know how to track that kind of thing down in future.
(and also not take pre-compiled beams as gospel).
-- Mike Berrow
----- Original Message -----
From: "t ty" <tty.erlang@gmail.com>
To: "Mike Berrow" <mberrow1@pacbell.net>
Sent: Sunday, August 05, 2007 2:53 PM
Subject: Re: [erlang-questions] Problem with socket-based distribution example in the "Programming
Erlang" book
> Is there are start_me_up function in the module. And is it exported ?
> From the shell do
>
> 1> l(mod_name_server).
> 2> mod_name_server:<hit tab key>
>
> this should show you the list of available functions.
>
> t
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| wuji |
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