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poolboy demo
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| defmodule HttpRequester do | |
| use GenServer.Behaviour | |
| def start_link(_) do | |
| :gen_server.start_link(__MODULE__, nil, []) | |
| end | |
| def fetch(server, url) do | |
| :gen_server.cast(server, {:fetch, url}) | |
| end | |
| def init(_) do | |
| {:ok, nil} | |
| end | |
| def handle_cast({:fetch, url}, state) do | |
| IO.puts "fetching #{url}" | |
| :timer.sleep 5000 | |
| IO.puts "fetched #{url}" | |
| {:noreply, state} | |
| end | |
| end | |
| defmodule PoolboyDemo do | |
| def run do | |
| {:ok, pool} = :poolboy.start_link( | |
| [worker_module: HttpRequester, size: 5, max_overflow: 0] | |
| ) | |
| Enum.each(1..20, fn(n) -> | |
| :poolboy.transaction(pool, fn(http_requester_pid) -> | |
| HttpRequester.fetch(http_requester_pid, "url #{n}") | |
| end) | |
| end) | |
| end | |
| end |
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Forked this to make it runnable in Elixir 1.0, and to make it run the poolboy workers concurrently instead of serially: https://gist.github.com/henrik/ceede9c4d9bf3fcb4dd5