Created
July 20, 2012 16:07
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Grow your own Erlang process ring
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-module(ring). | |
-export([chain/0, chain/1, start/3]). | |
chain() -> | |
chain(self()). | |
chain(Neighbor) -> | |
receive | |
stop -> | |
io:format("stopping ~p...~n", [self()]), | |
Neighbor ! stop; | |
grow -> | |
NewNeighbor = spawn(ring, chain, [Neighbor]), | |
io:format("grew ~p~n", [NewNeighbor]), | |
chain(NewNeighbor); | |
{send, Msg} -> | |
Neighbor ! {message, Msg, self()}, | |
chain(Neighbor); | |
{message, Msg, Origination} -> | |
case self() of | |
Origination -> | |
io:format("message made it back to origination~n"), | |
chain(Neighbor); | |
_ -> | |
io:format("forwarding message: ~p~n", [Msg]), | |
Neighbor ! {message, Msg, Origination}, | |
chain(Neighbor) | |
end | |
end. | |
sendMany(0, _, _) -> ok; | |
sendMany(N, Msg, Pid) -> | |
Pid ! Msg, | |
sendMany(N - 1, Msg, Pid). | |
start(M, N, Msg) -> | |
Pid = spawn(ring, chain, []), | |
sendMany(N, grow, Pid), | |
sendMany(M, {send, Msg}, Pid). |
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