Added BiddingRoundServer "CurrentRoundServer" with a facade to control it. "Listing Biddings" page shows information which round is currently running.

lib/beet_round_server/bidding_rounds.ex

@@ -37,6 +37,27 @@ defmodule BeetRoundServer.BiddingRounds do
   """
   def get_bidding_round!(id), do: Repo.get!(BiddingRound, id)
 
+  def get_highest_bidding_round!() do
+    query =
+      Ecto.Query.from(bidding_round in BiddingRound,
+        order_by: [desc: bidding_round.round_number],
+        limit: 1
+      )
+
+    Repo.one(query)
+  end
+
+  def get_bidding_round_by_number!(round_number) do
+    query =
+      Ecto.Query.from(bidding_round in BiddingRound,
+        where: bidding_round.round_number == ^round_number,
+        order_by: [desc: bidding_round.inserted_at],
+        limit: 1
+      )
+
+    Repo.one(query)
+  end
+
   @doc """
   Creates a bidding_round.
 

lib/beet_round_server/bidding_rounds/bidding_round_facade.ex

@@ -0,0 +1,118 @@
+defmodule BeetRoundServer.BiddingRounds.BiddingRoundFacade do
+  alias BeetRoundServer.BiddingRounds.BiddingRound
+  alias BeetRoundServer.BiddingRounds
+  alias BeetRoundServer.BiddingRounds.BiddingRoundServer
+
+  def restart_if_necessary() do
+    last_round = get_highest_bidding_round()
+
+    if last_round.stopped == false do
+      IO.puts("There is a last round, that wasn't stopped. Should be running...")
+
+      if !isAlive() do
+        IO.puts("...but it isn't. Restarting last round...")
+        restart_hightest_round()
+      end
+    end
+  end
+
+  def get_highest_bidding_round() do
+    last_round = BiddingRounds.get_highest_bidding_round!()
+
+    if last_round != nil do
+      last_round
+    else
+      %BiddingRound{round_number: 0, stopped: true, id: "00000000-0000-0000-0000-000000000000"}
+    end
+  end
+
+  def get_current_round do
+    restart_if_necessary()
+
+    if GenServer.whereis(CurrentRoundServer) == nil do
+      IO.puts("CurrentRoundServer isn't alive. Returning 0...")
+      # %BiddingRound{round_number: 0, stopped: true, id: "00000000-0000-0000-0000-000000000000"}
+      0
+    else
+      GenServer.call(CurrentRoundServer, :val)
+    end
+  end
+
+  def start_new_round() do
+    if isAlive() do
+      IO.puts("CurrentRoundServer is alive! Please stop the server before starting a new round")
+      {:error, "A current round is running! Please stop it, before starting a new round."}
+    else
+      IO.puts("CurrentRoundServer isn't alive. Starting instance...")
+
+      last_round = BiddingRounds.get_highest_bidding_round!()
+
+      cond do
+        last_round == nil ->
+          IO.puts("No bidding round found. Starting first round...")
+
+          round_number = 1
+
+          BiddingRoundServer.start(round_number)
+          BiddingRounds.create_bidding_round(%{round_number: round_number})
+
+        last_round.stopped == false ->
+          IO.puts("Last bidding round not stopped. Restarting round...")
+
+          BiddingRoundServer.start(last_round.round_number)
+
+        true ->
+          IO.puts("Last bidding round has stopped. Starting a new round...")
+
+          round_number = last_round.round_number + 1
+
+          BiddingRoundServer.start(round_number)
+          BiddingRounds.create_bidding_round(%{round_number: round_number})
+      end
+    end
+  end
+
+  def restart_hightest_round() do
+    IO.puts("Restarting hightest round...")
+
+    if isAlive() do
+      IO.puts("Server is alive. Nothing to do...")
+      IO.puts(["Current round: ", GenServer.call(CurrentRoundServer, :val)])
+    else
+      IO.puts("Server isn't alive. Trying to restart last round.")
+
+      last_round = BiddingRounds.get_highest_bidding_round!()
+
+      cond do
+        last_round == nil ->
+          IO.puts("No bidding round found! Can't restart round...")
+          {:error, "No bidding round found! Nothing to restart."}
+
+        true ->
+          IO.puts("Last bidding round found. Restarting...")
+
+          BiddingRoundServer.start(last_round.round_number)
+          BiddingRounds.update_bidding_round(last_round, %{stopped: false})
+      end
+    end
+  end
+
+  def stop_current_round() do
+    IO.puts("Stopping current round...")
+
+    if isAlive() do
+      IO.puts("Server is alive. Shutting down and writing to DB...")
+      current_round_number = GenServer.call(CurrentRoundServer, :val)
+      GenServer.stop(CurrentRoundServer)
+
+      current_round = BiddingRounds.get_bidding_round_by_number!(current_round_number)
+      BiddingRounds.update_bidding_round(current_round, %{stopped: true})
+    else
+      IO.puts("Server isn't alive. Nothing to shut down.")
+    end
+  end
+
+  def isAlive() do
+    GenServer.whereis(CurrentRoundServer) != nil
+  end
+end

lib/beet_round_server/bidding_rounds/bidding_round_server.ex

@@ -0,0 +1,39 @@
+defmodule BeetRoundServer.BiddingRounds.BiddingRoundServer do
+  use GenServer
+  def inc(pid), do: GenServer.cast(pid, :inc)
+  def dec(pid), do: GenServer.cast(pid, :dec)
+
+  def val(pid) do
+    GenServer.call(pid, :val)
+  end
+
+  def stop(pid) do
+    GenServer.stop(pid)
+  end
+
+  def start(initial_val) do
+    GenServer.start(__MODULE__, initial_val, name: CurrentRoundServer)
+  end
+
+  def init(initial_val) do
+    {:ok, initial_val}
+  end
+
+  def terminate(_reason, val) do
+    IO.puts("Stopping bidding round:")
+    IO.puts(val)
+    :ok
+  end
+
+  def handle_cast(:inc, val) do
+    {:noreply, val + 1}
+  end
+
+  def handle_cast(:dec, val) do
+    {:noreply, val - 1}
+  end
+
+  def handle_call(:val, _from, val) do
+    {:reply, val, val}
+  end
+end

lib/beet_round_server_web/controllers/bidding_round_controller.ex

@@ -3,22 +3,62 @@ defmodule BeetRoundServerWeb.BiddingRoundController do
 
   alias BeetRoundServer.BiddingRounds
   alias BeetRoundServer.BiddingRounds.BiddingRound
+  alias BeetRoundServer.BiddingRounds.BiddingRoundFacade
 
   action_fallback BeetRoundServerWeb.FallbackController
 
+  def get_highest(conn, _params) do
+    BiddingRoundFacade.restart_if_necessary()
+
+    last_round = BiddingRoundFacade.get_highest_bidding_round()
+
+    conn
+    |> render(:show, bidding_round: last_round)
+  end
+
+  def start_new(conn, _params) do
+    BiddingRoundFacade.start_new_round()
+
+    current_round = BiddingRounds.get_highest_bidding_round!()
+
+    conn
+    |> put_status(:created)
+    |> render(:show, bidding_round: current_round)
+  end
+
+  def restart(conn, _params) do
+    BiddingRoundFacade.restart_hightest_round()
+
+    current_round = BiddingRounds.get_highest_bidding_round!()
+
+    conn
+    |> put_status(:created)
+    |> render(:show, bidding_round: current_round)
+  end
+
+  def stop(conn, _params) do
+    BiddingRoundFacade.stop_current_round()
+
+    stopped_round = BiddingRounds.get_highest_bidding_round!()
+
+    conn
+    |> render(:show, bidding_round: stopped_round)
+  end
+
   def index(conn, _params) do
     bidding_rounds = BiddingRounds.list_bidding_rounds()
     render(conn, :index, bidding_rounds: bidding_rounds)
   end
 
-  def create(conn, %{"bidding_round" => bidding_round_params}) do
-    with {:ok, %BiddingRound{} = bidding_round} <- BiddingRounds.create_bidding_round(bidding_round_params) do
-      conn
-      |> put_status(:created)
-      |> put_resp_header("location", ~p"/api/bidding_rounds/#{bidding_round}")
-      |> render(:show, bidding_round: bidding_round)
-    end
-  end
+  # def create(conn, %{"bidding_round" => bidding_round_params}) do
+  #   with {:ok, %BiddingRound{} = bidding_round} <-
+  #          BiddingRounds.create_bidding_round(bidding_round_params) do
+  #     conn
+  #     |> put_status(:created)
+  #     |> put_resp_header("location", ~p"/api/bidding_rounds/#{bidding_round}")
+  #     |> render(:show, bidding_round: bidding_round)
+  #   end
+  # end
 
   def show(conn, %{"id" => id}) do
     bidding_round = BiddingRounds.get_bidding_round!(id)
@@ -28,7 +68,8 @@ defmodule BeetRoundServerWeb.BiddingRoundController do
   def update(conn, %{"id" => id, "bidding_round" => bidding_round_params}) do
     bidding_round = BiddingRounds.get_bidding_round!(id)
 
-    with {:ok, %BiddingRound{} = bidding_round} <- BiddingRounds.update_bidding_round(bidding_round, bidding_round_params) do
+    with {:ok, %BiddingRound{} = bidding_round} <-
+           BiddingRounds.update_bidding_round(bidding_round, bidding_round_params) do
       render(conn, :show, bidding_round: bidding_round)
     end
   end

lib/beet_round_server_web/live/bidding_live/index.ex

@@ -2,6 +2,7 @@ defmodule BeetRoundServerWeb.BiddingLive.Index do
   use BeetRoundServerWeb, :live_view
 
   alias BeetRoundServer.Biddings
+  alias BeetRoundServer.BiddingRounds.BiddingRoundFacade
 
   @impl true
   def render(assigns) do
@@ -16,6 +17,12 @@ defmodule BeetRoundServerWeb.BiddingLive.Index do
         </:actions>
       </.header>
 
+      <%= if @bidding_round == 0 do %>
+        <p>Keine Bietrunde aktiv.</p>
+      <% else %>
+        <p>Aktive Bietrunde: {@bidding_round}</p>
+      <% end %>
+
       <.table
         id="biddings"
         rows={@streams.biddings}
@@ -50,9 +57,12 @@ defmodule BeetRoundServerWeb.BiddingLive.Index do
       Biddings.subscribe_biddings(socket.assigns.current_scope)
     end
 
+    current_round = BiddingRoundFacade.get_current_round()
+
     {:ok,
      socket
      |> assign(:page_title, "Listing Biddings")
+     |> assign(bidding_round: current_round)
      |> stream(:biddings, list_biddings(socket.assigns.current_scope))}
   end
 
@@ -67,7 +77,8 @@ defmodule BeetRoundServerWeb.BiddingLive.Index do
   @impl true
   def handle_info({type, %BeetRoundServer.Biddings.Bidding{}}, socket)
       when type in [:created, :updated, :deleted] do
-    {:noreply, stream(socket, :biddings, list_biddings(socket.assigns.current_scope), reset: true)}
+    {:noreply,
+     stream(socket, :biddings, list_biddings(socket.assigns.current_scope), reset: true)}
   end
 
   defp list_biddings(current_scope) do