Created
April 7, 2017 15:18
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| -module(palindrome). | |
| -export([palindrome_check/1, server/1, serve/1]). | |
| -export([server_of_clients/0, serve_client/0]). | |
| -export([servers_of_clients/0,servers_balancer/3,many_serve_client/1]). | |
| rem_punct(String) -> lists:filter(fun (Ch) -> | |
| not(lists:member(Ch,"\"\'\t\n ")) | |
| end, | |
| String). | |
| to_small(String) -> lists:map(fun(Ch) -> | |
| case ($A =< Ch andalso Ch =< $Z) of | |
| true -> Ch+32; | |
| false -> Ch | |
| end | |
| end, | |
| String). | |
| palindrome_check(String) -> | |
| Normalise = to_small(rem_punct(String)), | |
| lists:reverse(Normalise) == Normalise. | |
| result_for_human(false) -> | |
| "is not a palindrome"; | |
| result_for_human(true) -> | |
| "is a palindrome". | |
| % return the response to the pid provided when creating the server | |
| server(Pid) -> | |
| spawn(palindrome,serve,[Pid]). | |
| serve(Pid) -> | |
| receive | |
| {check, Potentialpalindrome} -> | |
| Pid ! {result, io:format("~p ~p", [Potentialpalindrome, result_for_human(palindrome_check(Potentialpalindrome))])}, | |
| serve(Pid); | |
| stop -> | |
| io:format("stop") | |
| end. | |
| % return the response to the pid provided in the request | |
| server_of_clients() -> | |
| spawn(palindrome,serve_client,[]). | |
| serve_client() -> | |
| receive | |
| {check, Pid, Potentialpalindrome} -> | |
| Pid ! {result, io:format("~p ~p", [Potentialpalindrome, result_for_human(palindrome_check(Potentialpalindrome))])}, | |
| serve_client(); | |
| stop -> | |
| io:format("stop") | |
| end. | |
| % replicated servers returning the response to the pid provided in the request | |
| % ManyServers = palindrome:servers_of_clients(). | |
| % ManyServers ! {check, self(), "AaaaA"}. | |
| % ManyServers ! {check, self(), "AaadddaA"}. | |
| % ManyServers ! stop. | |
| servers_of_clients() -> | |
| First = spawn(palindrome, many_serve_client, ["server1"]), | |
| spawn(palindrome,servers_balancer,[First, | |
| First, | |
| spawn(palindrome, many_serve_client, ["server2"]) | |
| ]). | |
| next_server(X,X,Y) -> | |
| Y; | |
| next_server(Y,X,Y) -> | |
| X. | |
| servers_balancer(Next, Server1, Server2) -> | |
| receive | |
| stop -> | |
| Server1 ! stop, | |
| Server2 ! stop; | |
| Msg -> Next ! Msg | |
| end, | |
| servers_balancer(next_server(Next, Server1, Server2), Server1, Server2). | |
| many_serve_client(Name) -> | |
| receive | |
| {check, Pid, Potentialpalindrome} -> | |
| Pid ! {result, io:format("~p: ~p ~p", [Name, Potentialpalindrome, result_for_human(palindrome_check(Potentialpalindrome))])}, | |
| many_serve_client(Name); | |
| stop -> | |
| io:format("stop") | |
| end. | |
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