%% Thanks to Ulf Wiger at Ericcson for these comments:
%%
%% This file is identified via the erl command line option -config File.
%% Note that File should have no extension, e.g.
%% erl -config .../sys (if this file is called sys.config)
%%
%% In this file, you can redefine application environment variables.
%% This way, you don't have to modify the .app files of e.g. OTP applications.
%%
%%
%% This is an example config file for an HTTP balancer (TCP port 80)
%% instead of a distcc server balancer.

%% The balancer app is expecting a list of "be" records.  However, the
%% Erlang record mechanism is kindof ugly and limited.  So, we create 
%% tuples here that look like "be" records, but we must be careful so
%% that each entry in the tuple matches an actual "be" record:
%%
%% 0. The atom 'be'
%% 1. A string containing a hostname or IP address
%% 2. The TCP port number
%% 3. The status atom 'up'
%% 4. The maximum number of simultaneous connections, >= 1.
%% 5. The number of pending connections, 0.
%% 6. The number of active connections, 0.
%% 7. The last error term, 'no_error'.
%% 8. The last error timestamp, 0.
%% 9. Activity counter, 0.
%% 10. Activity time counter, 0.
%% 11. Activity list, [].

%% As an example, here's a list of quite heterogenous back-end hosts:
%% 
%% Server   CPU Mhz 
%% bld1     2 x  932
%% bld2     2 x  932
%% bld3     2 x  846
%% bld4     1 x 1263
%% bld5     2 x 1263
%% bld6     4 x 2384
%%
%% As far as distcc is concerned, CPU speed is the main concern, so
%% the back-end list will contain the hosts in descending CPU speed.


[{balance,
  [
   %% New distcc (0.15 or later) uses port 3632, old distcc uses 4200
   {local_tcp_port, 3632},
   %% be_conn_timeout is the timeout value to connect to a back-end host
   %% Value is in milliseconds
   {be_conn_timeout, 1000},
   %% be_inactivity_timeout is the timeout value for inactivity to a
   %% back-end host.  Value is in milliseconds.
   {be_inactivity_timeout, 120000},
   %% Initial back-end host list.  See the comments at top of file.
   %% Faster hosts should appear at the beginning of the list.
   {initial_be_list,
    [
     {be, "bld6", 3632, up, 4, 0, 0, no_error, 0, 0, 0, []},
     {be, "bld4", 3632, up, 1, 0, 0, no_error, 0, 0, 0, []},
     {be, "bld5", 3632, up, 2, 0, 0, no_error, 0, 0, 0, []},
     {be, "bld1", 3632, up, 2, 0, 0, no_error, 0, 0, 0, []},
     {be, "bld2", 3632, up, 2, 0, 0, no_error, 0, 0, 0, []},
     {be, "bld3", 3632, up, 2, 0, 0, no_error, 0, 0, 0, []}
     % Do _not_ put a trailing comma after the last item in an Erlang list.
    ]}
   %% Any additional {key, value} tuples for the balancer app go here
  ]}
].