Plasma GitLab Archive
Projects Blog Knowledge

Module Netplex_main

module Netplex_main: sig .. end
Main program for Netplex servers

type cmdline_config 
val args : ?defaults:cmdline_config ->
unit -> (Arg.key * Arg.spec * Arg.doc) list * cmdline_config
let (opt_list, cmdline_cfg) = args(): Returns opt_list for inclusion in the Arg.parse option list. The effects made available by the returned cmdline_cfg value.

defaults : The default argument values
val create : ?config_filename:string ->
?pidfile:string option ->
?foreground:bool -> unit -> cmdline_config
Creates the command-line configuration object
val modify : ?config_filename:string ->
?pidfile:string option ->
?foreground:bool ->
cmdline_config -> cmdline_config
Modifies the command-line configuration object
val config_filename : cmdline_config -> string
Returns the filename of the configuration file, or the default if it has not been set on the command-line
val config_filename_opt : cmdline_config -> string option
Returns the filename of the configuration file, or None if it has not been set on the command-line
val pidfile : cmdline_config -> string option
Returns the location of the PID file (if any)
val foreground : cmdline_config -> bool
Returns whether the daemon runs in the foreground
val startup : ?late_initializer:(Netplex_types.config_file ->
Netplex_types.controller -> unit) ->
?config_parser:(string -> Netplex_types.config_file) ->
Netplex_types.parallelizer ->
Netplex_types.logger_factory list ->
Netplex_types.workload_manager_factory list ->
Netplex_types.processor_factory list -> cmdline_config -> unit
Parses the configuration file and starts the Netplex daemon. Fails with Netplex_config.Config_error when an error in the configuration file is detected.

The late_initializer is called after the Netplex controller has been fully initialized, and before the main event loop is entered. You can perform here further initializations, e.g. starting helper threads.

The config_parser is by default Netplex_config.read_config_file. You can override it by whatever parser you would like to use.

As side-effect, the current logger of the Netlog module is set to selected Netplex logger. Note that this setting remains active even after startup returns to the caller. Also note that log messages submitted via Netlog appear as from component "netplex.other" if they are sent from outside of a container.


The typical main program for a Netplex server system looks like:

   let my_factories = ...

   let start() =
    let opts, cmdconf = Netplex_main.args() in
      (fun s -> raise(Arg.Bad ("Unknown arg: " ^ s))) 
      "usage: protoserver";
    let par = in  (* or *)

   Sys.set_signal Sys.sigpipe Sys.Signal_ignore;

This main program enables:

  • The standard command-line arguments -conf, -pid and -fg are understood
  • The configuration file is parsed
  • The configuration can refer to all loggers and workload managers coming with Netplex
  • The parallelizer is selected: Here, it is multi-processing (Netplex_mp). One could also select multi-threading (Netplex_mt)
  • The processors defined by my_factories are made available for connection processing

This web site is published by Informatikbüro Gerd Stolpmann
Powered by Caml