Created
September 27, 2015 21:45
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-module(server4). | |
-export([start/2, rpc/2, swap_code/2]). | |
start(Name, Mod) -> | |
register(Name, spawn(fun() -> loop(Name,Mod,Mod:init()) end)). | |
swap_code(Name, Mod) -> rpc(Name, {swap_code, Mod}). | |
rpc(Name, Request) -> | |
Name ! {self(), Request}, | |
receive | |
{Name, crash} -> exit(rpc); | |
{Name, ok, Response} -> Response | |
end. | |
loop(Name, Mod, OldState) -> | |
receive | |
{From, {swap_code, NewCallbackMod}} -> | |
From ! {Name, ok, ack}, | |
loop(Name, NewCallbackMod, OldState); | |
{From, Request} -> | |
try Mod:handle(Request, OldState) of | |
{Response, NewState} -> | |
From ! {Name, ok, Response}, | |
loop(Name, Mod, NewState) | |
catch | |
_: Why -> | |
log_the_error(Name, Request, Why), | |
From ! {Name, crash}, | |
loop(Name, Mod, OldState) | |
end | |
end. | |
log_the_error(Name, Request, Why) -> | |
io:format("Server ~p request ~p ~n" | |
"caused exception ~p~n", | |
[Name, Request, Why]). |
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