Created
July 4, 2020 20:21
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| % Compile: c(echo). | |
| -module(echo). | |
| -export([listener/0]). | |
| -author("William Vargas"). | |
| -version("1.0"). | |
| -spec listener() -> any(). | |
| listener() -> | |
| case rand:uniform(10) of | |
| 10 -> % It stops randomly | |
| io:format("[echo] stopped~n"); | |
| _ -> | |
| receive | |
| {Pid,M} -> | |
| io:format("[echo] ~w~n",[M]), | |
| Pid!M, | |
| listener(); | |
| Msg -> | |
| io:format("[echo] ~w~n",[Msg]) | |
| end | |
| end. |
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| % Compile: c(super). | |
| -module(super). | |
| -export([super/0]). | |
| -author("William Vargas"). | |
| -version("1.0"). | |
| -spec spawn_register(atom(),atom()) -> any(). | |
| spawn_register(Service, Function) -> | |
| Pid = spawn_link(Service,Function,[]), | |
| register(Service,Pid), | |
| io:format("[supr] ~w spawned: ~w~n",[Service,Pid]), | |
| Pid. | |
| -spec kill(atom()) -> any(). | |
| kill(Service) -> | |
| case is_pid(whereis(Service)) of | |
| true -> | |
| exit(whereis(Service),kill), | |
| io:format("[supr] ~w killed~n",[Service]); | |
| _ -> | |
| ok | |
| end. | |
| -spec super() -> any(). | |
| super() -> | |
| process_flag(trap_exit,true), | |
| E = spawn_register(echo,listener), | |
| T = spawn_register(talk,worker), | |
| loop(E,T). | |
| -spec loop(pid(),pid()) -> any(). | |
| loop(E,T) -> | |
| case rand:uniform(5) of | |
| 5 -> % It stops randomly | |
| kill(talk), | |
| kill(echo), | |
| io:format("[supr] stopped~n"); | |
| _ -> | |
| receive | |
| {'EXIT', T, _} -> | |
| timer:sleep(1000), | |
| loop(E,spawn_register(talk,worker)); | |
| {'EXIT', E, _} -> | |
| timer:sleep(1000), | |
| loop(spawn_register(echo,listener),T); | |
| Msg -> | |
| io:format("[supr] ~w~n",[Msg]) | |
| end | |
| end. | |
| % Tests: | |
| % c(echo). | |
| % c(talk). | |
| % c(super). | |
| % super:super(). |
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| % Compile: c(talk). | |
| -module(talk). | |
| -export([worker/0]). | |
| -author("William Vargas"). | |
| -version("1.0"). | |
| -spec worker() -> any(). | |
| worker() -> | |
| work(0). | |
| -spec work(integer()) -> any(). | |
| work(N) -> | |
| case rand:uniform(10) of | |
| 10 -> % It stops randomly | |
| io:format("[talk] stopped~n"); | |
| _ -> | |
| case is_pid(whereis(echo)) of | |
| true -> | |
| Msg = {self(),N}, | |
| echo!Msg, | |
| io:format("[talk] ~w~n",[Msg]), | |
| receive | |
| _Reply -> | |
| timer:sleep(1000), | |
| work(N+1) | |
| end; | |
| _ -> | |
| timer:sleep(1000), | |
| io:format("[talk] retrying~n"), | |
| work(N) | |
| end | |
| end. |
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