How to resolve the algorithm Distributed programming step by step in the OCaml programming language

Published on 12 May 2024 09:40 PM
#Ocaml

How to resolve the algorithm Distributed programming step by step in the OCaml programming language

Table of Contents

Problem Statement

Write two programs (or one program with two modes) which run on networked computers, and send some messages between them. The protocol used may be language-specific or not, and should be suitable for general distributed programming; that is, the protocol should be generic (not designed just for the particular example application), readily capable of handling the independent communications of many different components of a single application, and the transferring of arbitrary data structures natural for the language. This task is intended to demonstrate high-level communication facilities beyond just creating sockets.

Let's start with the solution:

Step by Step solution about How to resolve the algorithm Distributed programming step by step in the OCaml programming language

Source code in the ocaml programming language

open Printf
 
let create_logger () =
  def log(text) & logs(l) =
      printf "Logged: %s\n%!" text;
      logs((text, Unix.gettimeofday ())::l) & reply to log

   or search(text) & logs(l) =
      logs(l) & reply List.filter (fun (line, _) -> line = text) l to search
  in
    spawn logs([]);
    (log, search)

def wait() & finished() = reply to wait

let register name service = Join.Ns.register Join.Ns.here name service
 
let () =
  let log, search = create_logger () in
    register "log" log;
    register "search" search;
    Join.Site.listen (Unix.ADDR_INET (Join.Site.get_local_addr(), 12345));
    wait ()


open Printf
 
let ns_there = Join.Ns.there (Unix.ADDR_INET (Join.Site.get_local_addr(), 12345))
 
let lookup name = Join.Ns.lookup ns_there name

let log : string -> unit = lookup "log"
let search : string -> (string * float) list = lookup "search"
 
let find txt =
  printf "Looking for %s...\n" txt;
  List.iter (fun (line, time) ->
               printf "Found: '%s' at t = %f\n%!" (String.escaped line) time)
    (search txt)
 
let () =
  log "bar";
  find "foo";
  log "foo";
  log "shoe";
  find "foo"

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