Search icon CANCEL
Subscription
0
Cart icon
Your Cart (0 item)
Close icon
You have no products in your basket yet
Save more on your purchases now! discount-offer-chevron-icon
Savings automatically calculated. No voucher code required.
Arrow left icon
Explore Products
Best Sellers
New Releases
Books
Videos
Audiobooks
Learning Hub
Conferences
Free Learning
Arrow right icon
Mastering Elixir
Mastering Elixir

Mastering Elixir: Build and scale concurrent, distributed, and fault-tolerant applications

eBook
€20.98 €29.99
Paperback
€36.99
Subscription
Free Trial
Renews at €18.99p/m

What do you get with Print?

Product feature icon Instant access to your digital eBook copy whilst your Print order is Shipped
Product feature icon Paperback book shipped to your preferred address
Product feature icon Download this book in EPUB and PDF formats
Product feature icon Access this title in our online reader with advanced features
Product feature icon DRM FREE - Read whenever, wherever and however you want
OR
Modal Close icon
Payment Processing...
tick Completed

Shipping Address

Billing Address

Shipping Methods
Table of content icon View table of contents Preview book icon Preview Book

Mastering Elixir

Innards of an Elixir Project

After looking at the building blocks in the past chapter, we will now explore the fundamental aspects of any Elixir project. There are a few rules that need to be followed, but fortunately every one of them is simple to adopt and contributes to an understandable project structure. An application that doesn't get in the way of the evolution and maintenance tasks during all its years in production is a joy for the people who work with it, and this is exactly what we aim for.

We will start by learning what an Elixir application is and how we can structure an Elixir project, along with some of the existing good practices that you can leverage. We will introduce Umbrella applications and how they can help you to define more rigid boundaries between your project's components. When creating our umbrella project, we will use some common...

Elixir applications

Elixir inherits a lot of concepts from Erlang/OTP, and the application's behaviour is one of those concepts. For the Erlang VM, an application is a component that can be started and stopped as a single unit, and is described by an .app file (for example, hello_world.app) that defines, among other things, the Application Module Callback. This is a module that needs to implement a  start/2 function that's responsible for kickstarting the application, usually by spawning its top-level supervisor (in the next chapter, you'll learn all about supervisors). In a way, you can think about the start/2 function as the common main entry point on applications developed with other programming languages.

Because we're using Elixir, we don't need to explicitly specify the .app file. The Elixir compiler...

Elixir project structure

In the previous section, we created a sample project with Mix, but we didn't explore it thoroughly. Despite not enforcing a rigid structure and looking really simple, the Elixir project structure sets the baseline of every project, enabling you to get up to speed when facing a new codebase.

Let's create a simpler project, using mix new simple_project to generate the initial folder structure for us. Besides creating the .gitignore and README.md files, it also created the mix.exs file and three separate folders: config, lib and test. Take a look at this:

$ mix new simple_project
* creating README.md
* creating .gitignore
* creating mix.exs
* creating config
* creating config/config.exs
* creating lib
* creating lib/simple_project.ex
* creating test
* creating test/test_helper.exs
* creating test/simple_project_test.exs

Your Mix project...

Umbrella projects

In the previous section, we started by defining and creating a sample Elixir application with Mix. By using the application's behaviour, we were able to start and stop it as a unit, and other applications could depend on it by pointing to this application in their dependencies.

As time passes, and your application gets bigger, you start thinking about how to divide it into smaller independent components with well-defined responsibilities. At this point, will you create a project from scratch for your recently extracted logic and add it as a dependency? Probably not, since, for now, those extracted components only make sense in the context of your original application.

An umbrella project helps you in this situation, because it allows you to have more than one application under the same Elixir project. Mix lets you achieve this by placing your individual...

ElixirDrip – our showcase application

To clearly illustrate how you may incorporate the concepts and strategies in this book, we will develop a fully fledged web application named ElixirDrip, which was kick-started by the umbrella project we have just created.

ElixirDrip aims to be a fast and scalable web storage service, allowing the user to easily store and share their files living on the cloud. Our users will be able to upload files to their cloud storage and then share those files with other ElixirDrip users.

We will be adding features to the ElixirDrip umbrella application as we progress, taking it closer to our final goal with each chapter. The most important features of our application will be tackled in specific chapters throughout this book. Consider the following:

  • The design and implementation of our domain model will be analyzed in Chapter 7Persisting...

Adopting a consistent coding style

During your project inception, one of the most important steps is deciding on how to structure your project. The choices made here will, in the long term, affect how you maintain and evolve your application. The usage of static code analysis tools also contribute to the ease of maintenance of your project, letting you catch bugs, syntax errors and weird code style as soon as possible.

Here, we'll configure Credo to analyze our code, looking for possible refactors, common mistakes and inconsistencies and then use the Elixir 1.6 formatter to format all the code of our application.

We do not want to run our static analysis tools in production, so we will only add Credo as a dependency for the dev and test environments. We'll also make sure that Credo stays put when we run our project, by setting its runtime option as false...

Summary

In this chapter, we looked at an Elixir project from different angles. Accompanied by the versatile Mix tool that comes with Elixir, we ended the chapter by kick-starting our ElixirDrip umbrella project with two umbrella applications. These were the key ideas we addressed here:

  • An Elixir application defines an application callback function that is called when the VM starts any project, such as the main entry point of other languages. If you don't need to start your application, you don't need to implement the callback function. In this case, your code will amount to a simple bundle of modules and functions without any state.
  • The Mix compile task compiles our code to BEAM bytecode and places every module under a flat folder structure, automatically creating an .app file for our project, so that the VM knows how to start every needed application.
  • An...
Left arrow icon Right arrow icon
Download code icon Download Code

Key benefits

  • •Enhance your Elixir programming skills using its powerful tools and abstractions
  • •Discover how to develop a full-fledged file server
  • •Understand how to use Phoenix to create a web interface for your application.

Description

Running concurrent, fault-tolerant applications that scale is a very demanding responsibility. After learning the abstractions that Elixir gives us, developers are able to build such applications with inconceivable low effort. There is a big gap between playing around with Elixir and running it in production, serving live requests. This book will help you fll this gap by going into detail on several aspects of how Elixir works and showing concrete examples of how to apply the concepts learned to a fully ?edged application. In this book, you will learn how to build a rock-solid application, beginning by using Mix to create a new project. Then you will learn how the use of Erlang's OTP, along with the Elixir abstractions that run on top of it (such as GenServer and GenStage), that allow you to build applications that are easy to parallelize and distribute. You will also master supervisors (and supervision trees), and comprehend how they are the basis for building fault-tolerant applications. Then you will use Phoenix to create a web interface for your application. Upon fnishing implementation, you will learn how to take your application to the cloud, using Kubernetes to automatically deploy, scale, and manage it. Last, but not least, you will keep your peace of mind by learning how to thoroughly test and then monitor your application.

Who is this book for?

Mastering Elixir is for you if you have experience in Elixir programming and want to take it to the next level. This Elixir book shows you how to build, deploy, and maintain robust applications, allowing you to go from tinkering with Elixir on side projects to using it in a live environment. However, no prior knowledge of Elixir is required to enjoy the complex topics covered in the book.

What you will learn

  • •Use Elixir tools, including IEx and Mix
  • •Find out how an Elixir project is structured and how to create umbrella applications
  • •Discover the power of supervision trees, the basis for fault-tolerance
  • •Create a Domain-Specifc Language (DSL) that abstracts complexity
  • •Create a blazing-fast web interface for your application with Phoenix
  • •Set up an automatic deployment process for the cloud
  • •Monitor your application and be warned if anything unexpected happens
Estimated delivery fee Deliver to Estonia

Premium delivery 7 - 10 business days

€25.95
(Includes tracking information)

Product Details

Country selected
Publication date, Length, Edition, Language, ISBN-13
Publication date : Jul 30, 2018
Length: 574 pages
Edition : 1st
Language : English
ISBN-13 : 9781788472678
Vendor :
Apache
Category :
Languages :
Tools :

What do you get with Print?

Product feature icon Instant access to your digital eBook copy whilst your Print order is Shipped
Product feature icon Paperback book shipped to your preferred address
Product feature icon Download this book in EPUB and PDF formats
Product feature icon Access this title in our online reader with advanced features
Product feature icon DRM FREE - Read whenever, wherever and however you want
OR
Modal Close icon
Payment Processing...
tick Completed

Shipping Address

Billing Address

Shipping Methods
Estimated delivery fee Deliver to Estonia

Premium delivery 7 - 10 business days

€25.95
(Includes tracking information)

Product Details

Publication date : Jul 30, 2018
Length: 574 pages
Edition : 1st
Language : English
ISBN-13 : 9781788472678
Vendor :
Apache
Category :
Languages :
Tools :

Packt Subscriptions

See our plans and pricing
Modal Close icon
€18.99 billed monthly
Feature tick icon Unlimited access to Packt's library of 7,000+ practical books and videos
Feature tick icon Constantly refreshed with 50+ new titles a month
Feature tick icon Exclusive Early access to books as they're written
Feature tick icon Solve problems while you work with advanced search and reference features
Feature tick icon Offline reading on the mobile app
Feature tick icon Simple pricing, no contract
€189.99 billed annually
Feature tick icon Unlimited access to Packt's library of 7,000+ practical books and videos
Feature tick icon Constantly refreshed with 50+ new titles a month
Feature tick icon Exclusive Early access to books as they're written
Feature tick icon Solve problems while you work with advanced search and reference features
Feature tick icon Offline reading on the mobile app
Feature tick icon Choose a DRM-free eBook or Video every month to keep
Feature tick icon PLUS own as many other DRM-free eBooks or Videos as you like for just €5 each
Feature tick icon Exclusive print discounts
€264.99 billed in 18 months
Feature tick icon Unlimited access to Packt's library of 7,000+ practical books and videos
Feature tick icon Constantly refreshed with 50+ new titles a month
Feature tick icon Exclusive Early access to books as they're written
Feature tick icon Solve problems while you work with advanced search and reference features
Feature tick icon Offline reading on the mobile app
Feature tick icon Choose a DRM-free eBook or Video every month to keep
Feature tick icon PLUS own as many other DRM-free eBooks or Videos as you like for just €5 each
Feature tick icon Exclusive print discounts

Frequently bought together


Stars icon
Total 99.97
Learning Elixir
€29.99
Mastering Elixir
€36.99
Phoenix Web Development
€32.99
Total 99.97 Stars icon

Table of Contents

12 Chapters
Preparing for the Journey Ahead Chevron down icon Chevron up icon
Innards of an Elixir Project Chevron down icon Chevron up icon
Processes – The Bedrock of Concurrency and Fault Tolerance Chevron down icon Chevron up icon
Powered by Erlang/OTP Chevron down icon Chevron up icon
Demand-Driven Processing Chevron down icon Chevron up icon
Metaprogramming – Code That Writes Itself Chevron down icon Chevron up icon
Persisting Data Using Ecto Chevron down icon Chevron up icon
Phoenix – A Flying Web Framework Chevron down icon Chevron up icon
Finding Zen through Testing Chevron down icon Chevron up icon
Deploying to the Cloud Chevron down icon Chevron up icon
Keeping an Eye on Your Processes Chevron down icon Chevron up icon
Other Books You May Enjoy Chevron down icon Chevron up icon

Customer reviews

Rating distribution
Full star icon Full star icon Full star icon Full star icon Empty star icon 4
(2 Ratings)
5 star 50%
4 star 0%
3 star 50%
2 star 0%
1 star 0%
Tyler Munyon Jul 10, 2019
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Love the book so far, especially since we get to build an application that uses concepts that we are learning. Am wondering how to get the online version of the book on packt??
Amazon Verified review Amazon
Sean Bergstedt Apr 21, 2020
Full star icon Full star icon Full star icon Empty star icon Empty star icon 3
[REVISION]After re-referencing it a few more times, I've had time to reconsider my previous 1 star vote. There are some good sections on leveraging elixir's GenStage abstraction with Flow, which is unique and a pretty new addition to the Elixir scene. There are also some good sections on how to setup umbrella projects, how to integrate with SQL backend and best practices preserving coding style.The book is a bit rough around the edges, though, in terms of organization and just getting how the code works on your first read. Like I mentioned in my original review, you kind of have to hunt for what you want to learn and if you want to follow the code, you need to already have some familiarity with mix and the language. So, if you're just starting with Elixir, I'd recommend looking for one of the introductory books instead.[ORIGINAL]Lots of cross referencing and looking at the on-line source code to make sure your book code is tracking along nicely. Sometimes you have to look at something in later chapters in order to run code in earlier chapters. I ended up spending more time organizing the information the editors should have organized for me.I continue to be disappointed with Pakt Publishing. They just crank out books on volume instead of quality. At the end of the day, I don't blame the authors as I'm sure they spent a great deal of time on this, but the organization of code and flow of content is wildly out of sync with the quality one should expect for a book this price.
Amazon Verified review Amazon
Get free access to Packt library with over 7500+ books and video courses for 7 days!
Start Free Trial

FAQs

What is the delivery time and cost of print book? Chevron down icon Chevron up icon

Shipping Details

USA:

'

Economy: Delivery to most addresses in the US within 10-15 business days

Premium: Trackable Delivery to most addresses in the US within 3-8 business days

UK:

Economy: Delivery to most addresses in the U.K. within 7-9 business days.
Shipments are not trackable

Premium: Trackable delivery to most addresses in the U.K. within 3-4 business days!
Add one extra business day for deliveries to Northern Ireland and Scottish Highlands and islands

EU:

Premium: Trackable delivery to most EU destinations within 4-9 business days.

Australia:

Economy: Can deliver to P. O. Boxes and private residences.
Trackable service with delivery to addresses in Australia only.
Delivery time ranges from 7-9 business days for VIC and 8-10 business days for Interstate metro
Delivery time is up to 15 business days for remote areas of WA, NT & QLD.

Premium: Delivery to addresses in Australia only
Trackable delivery to most P. O. Boxes and private residences in Australia within 4-5 days based on the distance to a destination following dispatch.

India:

Premium: Delivery to most Indian addresses within 5-6 business days

Rest of the World:

Premium: Countries in the American continent: Trackable delivery to most countries within 4-7 business days

Asia:

Premium: Delivery to most Asian addresses within 5-9 business days

Disclaimer:
All orders received before 5 PM U.K time would start printing from the next business day. So the estimated delivery times start from the next day as well. Orders received after 5 PM U.K time (in our internal systems) on a business day or anytime on the weekend will begin printing the second to next business day. For example, an order placed at 11 AM today will begin printing tomorrow, whereas an order placed at 9 PM tonight will begin printing the day after tomorrow.


Unfortunately, due to several restrictions, we are unable to ship to the following countries:

  1. Afghanistan
  2. American Samoa
  3. Belarus
  4. Brunei Darussalam
  5. Central African Republic
  6. The Democratic Republic of Congo
  7. Eritrea
  8. Guinea-bissau
  9. Iran
  10. Lebanon
  11. Libiya Arab Jamahriya
  12. Somalia
  13. Sudan
  14. Russian Federation
  15. Syrian Arab Republic
  16. Ukraine
  17. Venezuela
What is custom duty/charge? Chevron down icon Chevron up icon

Customs duty are charges levied on goods when they cross international borders. It is a tax that is imposed on imported goods. These duties are charged by special authorities and bodies created by local governments and are meant to protect local industries, economies, and businesses.

Do I have to pay customs charges for the print book order? Chevron down icon Chevron up icon

The orders shipped to the countries that are listed under EU27 will not bear custom charges. They are paid by Packt as part of the order.

List of EU27 countries: www.gov.uk/eu-eea:

A custom duty or localized taxes may be applicable on the shipment and would be charged by the recipient country outside of the EU27 which should be paid by the customer and these duties are not included in the shipping charges been charged on the order.

How do I know my custom duty charges? Chevron down icon Chevron up icon

The amount of duty payable varies greatly depending on the imported goods, the country of origin and several other factors like the total invoice amount or dimensions like weight, and other such criteria applicable in your country.

For example:

  • If you live in Mexico, and the declared value of your ordered items is over $ 50, for you to receive a package, you will have to pay additional import tax of 19% which will be $ 9.50 to the courier service.
  • Whereas if you live in Turkey, and the declared value of your ordered items is over € 22, for you to receive a package, you will have to pay additional import tax of 18% which will be € 3.96 to the courier service.
How can I cancel my order? Chevron down icon Chevron up icon

Cancellation Policy for Published Printed Books:

You can cancel any order within 1 hour of placing the order. Simply contact customercare@packt.com with your order details or payment transaction id. If your order has already started the shipment process, we will do our best to stop it. However, if it is already on the way to you then when you receive it, you can contact us at customercare@packt.com using the returns and refund process.

Please understand that Packt Publishing cannot provide refunds or cancel any order except for the cases described in our Return Policy (i.e. Packt Publishing agrees to replace your printed book because it arrives damaged or material defect in book), Packt Publishing will not accept returns.

What is your returns and refunds policy? Chevron down icon Chevron up icon

Return Policy:

We want you to be happy with your purchase from Packtpub.com. We will not hassle you with returning print books to us. If the print book you receive from us is incorrect, damaged, doesn't work or is unacceptably late, please contact Customer Relations Team on customercare@packt.com with the order number and issue details as explained below:

  1. If you ordered (eBook, Video or Print Book) incorrectly or accidentally, please contact Customer Relations Team on customercare@packt.com within one hour of placing the order and we will replace/refund you the item cost.
  2. Sadly, if your eBook or Video file is faulty or a fault occurs during the eBook or Video being made available to you, i.e. during download then you should contact Customer Relations Team within 14 days of purchase on customercare@packt.com who will be able to resolve this issue for you.
  3. You will have a choice of replacement or refund of the problem items.(damaged, defective or incorrect)
  4. Once Customer Care Team confirms that you will be refunded, you should receive the refund within 10 to 12 working days.
  5. If you are only requesting a refund of one book from a multiple order, then we will refund you the appropriate single item.
  6. Where the items were shipped under a free shipping offer, there will be no shipping costs to refund.

On the off chance your printed book arrives damaged, with book material defect, contact our Customer Relation Team on customercare@packt.com within 14 days of receipt of the book with appropriate evidence of damage and we will work with you to secure a replacement copy, if necessary. Please note that each printed book you order from us is individually made by Packt's professional book-printing partner which is on a print-on-demand basis.

What tax is charged? Chevron down icon Chevron up icon

Currently, no tax is charged on the purchase of any print book (subject to change based on the laws and regulations). A localized VAT fee is charged only to our European and UK customers on eBooks, Video and subscriptions that they buy. GST is charged to Indian customers for eBooks and video purchases.

What payment methods can I use? Chevron down icon Chevron up icon

You can pay with the following card types:

  1. Visa Debit
  2. Visa Credit
  3. MasterCard
  4. PayPal
What is the delivery time and cost of print books? Chevron down icon Chevron up icon

Shipping Details

USA:

'

Economy: Delivery to most addresses in the US within 10-15 business days

Premium: Trackable Delivery to most addresses in the US within 3-8 business days

UK:

Economy: Delivery to most addresses in the U.K. within 7-9 business days.
Shipments are not trackable

Premium: Trackable delivery to most addresses in the U.K. within 3-4 business days!
Add one extra business day for deliveries to Northern Ireland and Scottish Highlands and islands

EU:

Premium: Trackable delivery to most EU destinations within 4-9 business days.

Australia:

Economy: Can deliver to P. O. Boxes and private residences.
Trackable service with delivery to addresses in Australia only.
Delivery time ranges from 7-9 business days for VIC and 8-10 business days for Interstate metro
Delivery time is up to 15 business days for remote areas of WA, NT & QLD.

Premium: Delivery to addresses in Australia only
Trackable delivery to most P. O. Boxes and private residences in Australia within 4-5 days based on the distance to a destination following dispatch.

India:

Premium: Delivery to most Indian addresses within 5-6 business days

Rest of the World:

Premium: Countries in the American continent: Trackable delivery to most countries within 4-7 business days

Asia:

Premium: Delivery to most Asian addresses within 5-9 business days

Disclaimer:
All orders received before 5 PM U.K time would start printing from the next business day. So the estimated delivery times start from the next day as well. Orders received after 5 PM U.K time (in our internal systems) on a business day or anytime on the weekend will begin printing the second to next business day. For example, an order placed at 11 AM today will begin printing tomorrow, whereas an order placed at 9 PM tonight will begin printing the day after tomorrow.


Unfortunately, due to several restrictions, we are unable to ship to the following countries:

  1. Afghanistan
  2. American Samoa
  3. Belarus
  4. Brunei Darussalam
  5. Central African Republic
  6. The Democratic Republic of Congo
  7. Eritrea
  8. Guinea-bissau
  9. Iran
  10. Lebanon
  11. Libiya Arab Jamahriya
  12. Somalia
  13. Sudan
  14. Russian Federation
  15. Syrian Arab Republic
  16. Ukraine
  17. Venezuela