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Elixir Cookbook

Elixir Cookbook

By : Paulo Pereira
4.5 (2)
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Elixir Cookbook

Elixir Cookbook

4.5 (2)
By: Paulo Pereira

Overview of this book

This book is intended for users with some knowledge of the Elixir language syntax and basic data types/structures. Although this is a cookbook and no sequential reading is required, the book’s structure will allow less advanced users who follow it to be gradually exposed to some of Elixir’s features and concepts specific to functional programming. To get the most out of this book, you need to be well versed with Erlang.
Table of Contents (11 chapters)
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10
Index

Expanding our server


Our server implementation lacks a few things. How to stop it gracefully and how to upgrade its code?

Our current implementation (right below the ## Callbacks (Server API) comment) has three of the six callbacks that form the GenServer base skeleton. The ones missing are handle_info/2, terminate/2, and code_change/3.

We will be implementing all of these functions in this recipe.

Note

The GenServer provides default implementations for all :gen_server callbacks. This is the reason we can get away without having to define all of them explicitly, like we did in Erlang.

Getting ready

To start, we need to load the connection_tracker.ex module in a code editor.

How to do it…

We will follow these steps to implement the functions and make our server a full-blown GenServer:

  1. Implement the handle_info/2 function:

    def handle_info(info, state) do
      IO.puts("Received info message #{inspect(info)}")
      {:noreply, state}
    end
  2. Implement the terminate/2 function:

    def terminate(reason, state) do
      IO...

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