After spending a good while getting rb to work on a remote shell, I would like to get stdio / error logger messages on a remote shell, I have dug around changing group_leaders but it would seem to require changing the group_leader of all the running process, and my experiments have found that to be pretty unstable. ...
In using the erlang mysql module the exposed external functions are: %% External exports -export([start_link/5, start_link/6, start_link/7, start_link/8, start/5, start/6, start/7, start/8, connect/7, connect/8, connect/9, fetch/1, fetch/2, fetch/3, prepare/2, execute/1, execute/2, ...
It has to be self contained, some sort of Erlang runtime library, and the BEAM files. This is so that anyone can run the program with one click, by running a .exe off a network drive, without having to install Erlang or anything else. ...
Hello! What do you recommend me to use with Erlang -- MySQL or Postgres ? Which DB has better (more mature, more stable, faster) driver for Erlang ? ...
Hi, I've got a block of erlydtl code which I use repeatedly and would like to abstract to some kind of block / partial template. The issue is that I need to pass the block a local variable. This is possible with Rails partial templates; it looks like it's possible with Django's blocks [albeit with some kind of Python hackery]; I'm wonde...
I've got a module that I'm attempting to turn into a proper OTP application. Currently, the module has start/0 which starts a genserver which supplies configuration data read from a config file. It then calls inets:start(httpd,config:lookup(httpd_conf)). I gather that I need to move the starting of these out into the .app file's (appl...
I have an Erlang application running as a daemon, configured as an SSH server. I can connect to it with an SSH client and I get the standard Erlang REPL. If I 'q().' I shut down the Erlang VM, not the connection. If I close the connection ('~.' for OpenSSH, close the window in PuTTY) some processes remain under the sshd_sup/ssh_system_...
I am writing an AMQP Client Library in Erlang. For the 'connection.open' method, there are 2 reserved parameters "documented" in AMQP 0.9.1 out of a total of 3. When I send the method in question without the "reserved parameters", I get "unable to decode method" in the error log. What should I be sending as value for those "reserved p...
I am currently using: c(module_name) : to build my Erlang files ones by one, and I was wondering about how other people handle the build process for Erlang when they have multiple files ...
Let's say that I have an Erlang function, with spec. -spec foo(integer(), string()) -> boolean(). foo(_Integer, _String) -> true. My dream would be to generate the edoc from this information within Emacs automatically. The generated code should look like: %%-----------------------------------------------------------------...
I've been reading a lot about how Scala and Erlang does lightweight threads and their concurrency model (actors). However, I have my doubts. Do Scala and Erlang use an approach similar to the old thread model used by Java (green threads) ? For example, suppose that there is a machine with 2 cores, so the Scala/Erlang environment will ...
Hello, I am working on a decentralized Erlang application. I am currently working on a single PC and creating multiple nodes by initializing erl with the -sname flag. When I spawn a process using spawn/4 on its home node, I can see output generated by calls io:format/2 within that process in its home erl instance. When I spawn a proce...
I have a list of tuples, say [{x, a, y}, {x, b, y}]. Is there a built-in function (or can I use a combination of BIFs) to delete all tuples matching {x, _, y}, as in match and delete based on the first and third term in the tuples, ignoring the second? ...
I try to compare Mnesia with more traditional databases. As I understand it tables in Mnesia can be located to (see Memory consumption in Mnesia): ram_copies - tables are stored in ets, so no durability as in ACID. disc_copies - tables are located to ets and dets, so the table can not be bigger than the available memory? And if the ta...
Hello all, Since a few months I've been learning Erlang, and now it was time to do some basic GUI. After some quick research I saw there was an interesting library called 'wxi' (based on Fudgets of Haskell) which uses a different approach on GUI's. No central loop, every widget processes it's own events and handles it's own data. What...
I have written a simple erlang app using gen_server. When starting it with application:start(myapp), I get the following tuple... {error,{bad_application,{appliction,myapp ... (rest of my application config). There are no other error or warning messages. I have also tried to google examples of how to configure gen_server and also the...
Is there any way to implement Erlang-style light-weight processes in .NET? I found some projects that implement Erlang messaging model (actors model). For example, Axum. But I found nothing about light-weight processes implementation. I mean multiple processes that run in a context of a single OS-thread or OS-process. ...
Hi, I have the following function that takes a number like 5 and creates a list of all the numbers from 1 to that number so create(5). returns [1,2,3,4,5]. I have over used guards I think and was wondering if there is a better way to write the following: create(N) -> create(1, N). create(N,M) when N =:= M -> [N]; create(N,M) ...
I need my erlang application to read and write through a named pipe. Opening the named pipe as a file will fail with eisdir. I wrote the following module, but it is fragile and feels wrong in many ways. Also it fails on reading after a while. Is there a way to make it more ... elegant ? -module(port_forwarder). -export([start/2, forwa...
Hi, I have a OTP application comprising a single supervisor supervising a small number of gen_servers. A typical child specification is as follows: {my_server, {my_server, start_link, [123]}, permanent, 5000, worker, [my_server]} No problems so far. I now want to an add extra gen_server to the supervisor structure, usi...