init

lib/process_communication.ex

@@ -0,0 +1,36 @@
+defmodule Child do
+  def start_link do
+    GenServer.start_link(__MODULE__, [])
+  end
+
+  def init(_args) do
+    {:ok, 0}
+  end
+
+  def handle_info({:info, n}, state) do
+    IO.puts "info #{n}"
+    {:noreply, state + n}
+  end
+
+  def handle_cast({:cast, n}, state) do
+    IO.puts "cast #{n}"
+    {:noreply, state + n}
+  end
+
+  def handle_call({:call, n}, _from, state) do
+    IO.puts "call #{n}"
+    {:reply, state + n, state + n}
+  end
+end
+
+defmodule ProcessCommunication do
+  def run do
+    {:ok, child} = Child.start_link()
+
+    send(child, {:info, 7})
+    GenServer.cast(child, {:cast, 17})
+    result = GenServer.call(child, {:call, 31})
+
+    IO.puts "Rusult: #{result}"
+  end
+end