lib/todo/cache.ex

@@ -3,7 +3,6 @@ defmodule Todo.Cache do
 
   @impl GenServer
   def init(_init_args) do
-    Todo.Database.start()
     {:ok, %{}}
   end
 
@@ -14,7 +13,7 @@ defmodule Todo.Cache do
         {:reply, process, state}
 
       :error ->
-        {:ok, new_process} = Todo.Server.start(name)
+        new_process = Todo.Server.start()
 
         new_state = Map.put(state, name, new_process)
 

lib/todo/database.ex

@@ -1,67 +0,0 @@
-defmodule Todo.Database do
-  alias Todo.DatabaseWorker
-  use GenServer
-
-  @db_folder "./persist"
-  @num_of_workers 3
-
-  def start do
-    GenServer.start(__MODULE__, nil, name: __MODULE__)
-  end
-
-  def store(key, data) do
-    GenServer.cast(__MODULE__, {:store, key, data})
-  end
-
-  def get(key) do
-    GenServer.call(__MODULE__, {:get, key})
-  end
-
-  @impl GenServer
-  def init(_) do
-    File.mkdir_p!(@db_folder)
-
-    {:ok, nil, {:continue, :init}}
-  end
-
-  @impl GenServer
-  def handle_continue(:init, nil) do
-    File.mkdir_p!(@db_folder)
-
-    workers =
-      0..(@num_of_workers - 1)
-      |> Enum.map(fn i ->
-        {:ok, pid} = Todo.DatabaseWorker.start(@db_folder)
-        {i, pid}
-      end)
-      |> Map.new()
-
-    IO.inspect(workers)
-    {:noreply, workers}
-  end
-
-  @impl GenServer
-  def handle_cast({:store, key, data}, workers) do
-    workers
-    |> get_worker(key)
-    |> DatabaseWorker.store(key, data)
-
-    {:noreply, workers}
-  end
-
-  @impl GenServer
-  def handle_call({:get, key}, _, workers) do
-    data =
-      workers
-      |> get_worker(key)
-      |> DatabaseWorker.get(key)
-
-    {:reply, data, workers}
-  end
-
-  defp choose_worker(workers, key) do
-    id = :erlang.phash2(key, @num_of_workers)
-
-    Map.fetch!(workers, id)
-  end
-end

lib/todo/database_worker.ex

@@ -1,48 +0,0 @@
-defmodule Todo.DatabaseWorker do
-  use GenServer
-
-  def start(db_folder) do
-    GenServer.start(__MODULE__, db_folder)
-  end
-
-  def store(pid, key, data) do
-    GenServer.cast(pid, {:store, key, data})
-  end
-
-  def get(pid, key) do
-    GenServer.call(pid, {:get, key})
-  end
-
-  @impl GenServer
-  def init(db_folder) do
-    {:ok, db_folder}
-  end
-
-  @impl GenServer
-  def handle_cast({:store, key, data}, db_folder) do
-    {db_folder, key}
-    |> file_name()
-    |> File.write!(:erlang.term_to_binary(data))
-
-    {:noreply, db_folder}
-  end
-
-  @impl GenServer
-  def handle_call({:get, key}, _, db_folder) do
-    data =
-      case File.read(file_name({db_folder, key})) do
-        {:ok, contents} ->
-          :erlang.binary_to_term(contents)
-
-        _ ->
-          nil
-      end
-
-    {:reply, data, db_folder}
-  end
-
-  def file_name({db_folder, key}) do
-    Path.join(db_folder, to_string(key))
-  end
-
-end

lib/todo/server.ex

@@ -1,8 +1,52 @@
 defmodule Todo.Server do
   use GenServer
 
-  def start(name) do
-    GenServer.start(__MODULE__, name)
+  @impl GenServer
+  def init(%_{} = todo_list) do
+    {:ok, todo_list}
+  end
+
+  @impl GenServer
+  def init(entries) do
+    {:ok, Todo.List.new(entries)}
+  end
+
+  @impl GenServer
+  def handle_call({:entries, date}, _from, todo_list) do
+    entries = Todo.List.entries(todo_list, date)
+
+    {:reply, entries, todo_list}
+  end
+
+  @impl GenServer
+  def handle_cast({:add, entry}, todo_list) do
+    new_todo_list = Todo.List.add(todo_list, entry)
+
+    {:noreply, new_todo_list}
+  end
+
+  @impl GenServer
+  def handle_cast({:update, id, update_fun}, todo_list) do
+    new_todo_list = Todo.List.update(todo_list, id, update_fun)
+
+    {:noreply, new_todo_list}
+  end
+
+  @impl GenServer
+  def handle_cast({:delete, id}, todo_list) do
+    new_todo_list = Todo.List.delete(todo_list, id)
+
+    {:noreply, new_todo_list}
+  end
+
+  def start(entries \\ [])
+
+  def start(%_{} = todo_list) do
+    GenServer.start(__MODULE__, todo_list)
+  end
+
+  def start(entries) do
+    GenServer.start(__MODULE__, entries)
   end
 
   def add(pid, entry) do
@@ -20,46 +64,4 @@ defmodule Todo.Server do
   def delete(pid, id) do
     GenServer.cast(pid, {:delete, id})
   end
-
-  @impl GenServer
-  def init(name) do
-    {:ok, {name, nil}, {:continue, :init}}
-  end
-
-  @impl GenServer
-  def handle_continue(:init, {name, nil}) do
-    todo_list = Todo.Database.get(name) || Todo.List.new()
-    {:noreply, {name, todo_list}}
-  end
-
-  @impl GenServer
-  def handle_call({:entries, date}, _from, {name, todo_list}) do
-    entries = Todo.List.entries(todo_list, date)
-
-    {:reply, entries, {name, todo_list}}
-  end
-
-  @impl GenServer
-  def handle_cast({:add, entry}, {name, todo_list}) do
-    new_todo_list = Todo.List.add(todo_list, entry)
-    Todo.Database.store(name, new_todo_list)
-
-    {:noreply, {name, new_todo_list}}
-  end
-
-  @impl GenServer
-  def handle_cast({:update, id, update_fun}, {name, todo_list}) do
-    new_todo_list = Todo.List.update(todo_list, id, update_fun)
-    Todo.Database.store(name, new_todo_list)
-
-    {:noreply, {name, new_todo_list}}
-  end
-
-  @impl GenServer
-  def handle_cast({:delete, id}, {name, todo_list}) do
-    new_todo_list = Todo.List.delete(todo_list, id)
-    Todo.Database.store(name, new_todo_list)
-
-    {:noreply, {name, new_todo_list}}
-  end
 end