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Robust job processing, backed by modern PostgreSQL, SQLite3, and MySQL.
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lib/oban/queue/watchman.ex
defmodule Oban.Queue.Watchman do
@moduledoc false
use GenServer
alias Oban.Queue.Producer
alias __MODULE__, as: State
@type option ::
{:foreman, GenServer.name()}
| {:name, module()}
| {:producer, GenServer.name()}
| {:shutdown, timeout()}
defstruct [:foreman, :producer, :shutdown, interval: 10]
@spec child_spec([option]) :: Supervisor.child_spec()
def child_spec(opts) do
shutdown =
case opts[:shutdown] do
0 -> :brutal_kill
value -> value
end
%{id: __MODULE__, start: {__MODULE__, :start_link, [opts]}, shutdown: shutdown}
end
@spec start_link([option]) :: GenServer.on_start()
def start_link(opts) do
{name, opts} = Keyword.pop(opts, :name)
GenServer.start_link(__MODULE__, struct!(State, opts), name: name)
end
@impl GenServer
def init(state) do
Process.flag(:trap_exit, true)
{:ok, state}
end
@impl GenServer
def terminate(_reason, %State{} = state) do
# There is a chance that the foreman doesn't exist, and we never want to raise another error
# as part of the shut down process.
try do
:ok = Producer.shutdown(state.producer)
:ok = wait_for_executing(state)
catch
:exit, _reason -> :ok
end
:ok
end
defp wait_for_executing(state) do
case DynamicSupervisor.count_children(state.foreman) do
%{active: 0} ->
:ok
_ ->
:ok = Process.sleep(state.interval)
wait_for_executing(state)
end
end
end