Created
February 23, 2020 05:10
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Poll in Elixir
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defmodule Poll do | |
defstruct candidates: [] | |
#Public API | |
def start_link() do | |
poll = %Poll{} | |
spawn_link(Poll, :run, [poll]) | |
end | |
def exit(pid) when is_pid(pid) do | |
send(pid, :exit) | |
end | |
def add_candidate(pid, name) when is_pid(pid) do | |
send(pid, {:add_candidate, name}) | |
end | |
def vote(pid, name) when is_pid(pid) do | |
send(pid, {:vote, name}) | |
end | |
#Implemented Functions | |
def add_candidate(poll, name) do | |
candidate = Candidate.new(name) | |
#candidates = poll.candidates ++ [candidate] | |
candidates = [candidate | poll.candidates] | |
%{poll | candidates: candidates} | |
end | |
def vote(poll, name) do | |
candidates = Enum.map(poll.candidates, &increment_vote(&1, name)) | |
Map.put(poll, :candidates, candidates) | |
end | |
def candidates(pid) when is_pid(pid) do | |
send(pid, {:candidates, self()}) | |
receive do | |
{^pid, poll} -> poll.candidates | |
end | |
end | |
def new(candidates \\ []) do | |
%Poll{candidates: candidates} | |
end | |
defp increment_vote(candidate, name) when is_binary(name) do | |
increment_vote(candidate, candidate.name == name) | |
end | |
defp increment_vote(candidate, _can_increment=false), do: candidate | |
defp increment_vote(candidate, _can_increment=true) do | |
Map.update!(candidate, :votes, &(&1 +1)) | |
end | |
def run(:quit), do: :quit | |
def run(poll) do | |
receive do | |
msg -> | |
#IO.inspect(msg, label: "Message") | |
handle(msg, poll) | |
end | |
#|> IO.inspect(label: "Poll") | |
|> run() | |
end | |
def handle({:add_candidate, name}, poll) do | |
poll |> | |
Poll.add_candidate(name) | |
end | |
def handle({:vote, name}, poll) do | |
poll |> | |
Poll.vote(name) | |
end | |
def handle({:candidates, pid}, poll) do | |
send(pid, {self(), poll}) | |
poll | |
end | |
def handle(:exit, _poll) do | |
run(:quit) | |
end | |
def handle(msg, poll) do | |
IO.inspect(msg, label: "Unknown Msg") | |
poll | |
end | |
end |
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