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defmodule FibAgent do | |
def start_link do | |
cache = Enum.into([{0, 0}, {1, 1}], HashDict.new) | |
Agent.start_link(fn -> cache end) | |
end | |
def fib(pid, n) when n >= 0 do | |
Agent.get_and_update(pid, &do_fib(&1, n)) | |
end | |
defp do_fib(cache, n) do | |
if cached = cache[n] do | |
{cached, cache} | |
else | |
{val1, cache} = do_fib(cache, n - 1) | |
{val2, cache} = do_fib(cache, n - 2) | |
{val1 + val2, Dict.put(cache, n, val1 + val2)} | |
end | |
end | |
end | |
{:ok, agent} = FibAgent.start_link() | |
IO.puts FibAgent.fib(agent, 20) | |
IO.puts FibAgent.fib(agent, 20) |
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