95 lines
2.8 KiB
Elixir
95 lines
2.8 KiB
Elixir
defmodule TakeANumberDeluxe do
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alias TakeANumberDeluxe.State
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use GenServer
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# Client API
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@spec start_link(keyword()) :: {:ok, pid()} | {:error, atom()}
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def start_link(init_arg) do
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GenServer.start_link(__MODULE__, init_arg)
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end
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@spec report_state(pid()) :: State.t()
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def report_state(machine) do
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GenServer.call(machine, :report_state)
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end
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@spec queue_new_number(pid()) :: {:ok, integer()} | {:error, atom()}
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def queue_new_number(machine) do
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GenServer.call(machine, :queue_new_number)
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end
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@spec serve_next_queued_number(pid(), integer() | nil) :: {:ok, integer()} | {:error, atom()}
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def serve_next_queued_number(machine, priority_number \\ nil) do
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GenServer.call(machine, {:serve_next_queued_number, priority_number})
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end
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@spec reset_state(pid()) :: :ok
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def reset_state(machine) do
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GenServer.cast(machine, :reset_state)
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end
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# Server callbacks
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@impl GenServer
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def init(options) do
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with min <- Keyword.get(options, :min_number),
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max <- Keyword.get(options, :max_number),
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shutdown <- Keyword.get(options, :auto_shutdown_timeout, :infinity),
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{:ok, state} <- State.new(min, max, shutdown) do
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{:ok, state, shutdown}
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else
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_ -> {:stop, :invalid_configuration}
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end
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end
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@impl GenServer
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def handle_call(:report_state, _from, state) do
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{:reply, state, state, state.auto_shutdown_timeout}
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end
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@impl GenServer
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def handle_call(:queue_new_number, _from, state) do
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case State.queue_new_number(state) do
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{:ok, new_number, new_state} -> {:reply, {:ok, new_number}, new_state, new_state.auto_shutdown_timeout}
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error -> {:reply, error, state, state.auto_shutdown_timeout}
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end
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end
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@impl GenServer
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def handle_call({:serve_next_queued_number, priority_number}, _from, state) do
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case State.serve_next_queued_number(state, priority_number) do
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{:ok, new_number, new_state} -> {:reply, {:ok, new_number}, new_state, new_state.auto_shutdown_timeout}
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error -> {:reply, error, state, state.auto_shutdown_timeout}
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end
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end
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@impl GenServer
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def handle_call(_request, _from, state) do
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{:reply, :unknown_command, state, state.auto_shutdown_timeout}
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end
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@impl GenServer
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def handle_cast(
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:reset_state,
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%State{min_number: min_number, max_number: max_number, auto_shutdown_timeout: auto_shutdown_timeout}
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) do
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{:ok, new_state} = State.new(min_number, max_number, auto_shutdown_timeout)
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{:noreply, new_state, new_state.auto_shutdown_timeout}
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end
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@impl GenServer
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def handle_cast(_request, state) do
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{:noreply, state, state.auto_shutdown_timeout}
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end
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@impl GenServer
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def handle_info(:timeout, state) do
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{:stop, :normal, state}
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end
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@impl GenServer
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def handle_info(_request, state) do
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{:noreply, state, state.auto_shutdown_timeout}
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end
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end
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