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  • Book Overview & Buying Apex Design Patterns
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Apex Design Patterns

Apex Design Patterns

By : Zaa, Verma
4.7 (9)
Buy this Book
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Apex Design Patterns

Apex Design Patterns

4.7 (9)
By: Zaa, Verma
Buy this Book

Overview of this book

Apex is an on-demand programming language providing a complete set of features for building business applications – including data models and objects to manage data. Apex being a proprietor programming language from Salesforce to be worked with multi tenant environment is a lot different than traditional OOPs languages like Java and C#. It acts as a workflow engine for managing collaboration of the data between users, a user interface model to handle forms and other interactions, and a SOAP API for programmatic access and integration. Apex Design Patterns gives you an insight to several problematic situations that can arise while developing on Force.com platform and the usage of Design patterns to solve them. Packed with real life examples, it gives you a walkthrough from learning design patterns that Apex can offer us, to implementing the appropriate ones in your own application. Furthermore, we learn about the creational patterns that deal with object creation mechanism and structural patterns that helps to identify the relationship between entities. Also, the behavioural and concurrency patterns are put forward explaining the communication between objects and multi-threaded programming paradigm respectively. We later on, deal with the issues regarding structuring of classes, instantiating or how to give a dynamic behaviour at a runtime, with the help of anti-patterns. We learn the basic OOPs principal in polymorphic and modular way to enhance its capability. Also, best practices of writing Apex code are explained to differentiate between the implementation of appropriate patterns. This book will also explain some unique patterns that could be applied to get around governor limits. By the end of this book, you will be a maestro in developing your applications on Force.com for Salesforce
Table of Contents (7 chapters)
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Preface
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Preface
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What this book covers
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What you need for this book
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Who this book is for
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Conventions
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Reader feedback
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Customer support
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1
1. An Introduction to Apex Design Pattern
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1. An Introduction to Apex Design Pattern
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Innovation
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Design patterns and learning
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Object-Oriented Programming (OOP)
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OOPs in play
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An interface
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An abstract class
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Advantages of design patterns
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Design patterns and Apex
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Gang of Four (GoF)
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The SOLID principle
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Summary
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2. Creational Patterns
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2. Creational Patterns
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Factory method pattern
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Abstract factory pattern
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The singleton pattern
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The builder pattern
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The prototype pattern
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Summary
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3. Structural Patterns
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3. Structural Patterns
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The facade pattern
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The adapter pattern
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The bridge pattern
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The composite pattern
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The decorator pattern
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The flyweight pattern
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Summary
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4. Behavioral Patterns
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4. Behavioral Patterns
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The chain of responsibility pattern
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The command pattern
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The interpreter pattern
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The iterator pattern
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The visitor pattern
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The memento pattern
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The observer pattern
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The state pattern
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The strategy pattern
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Summary
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5. Handling Concurrency in Apex
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5. Handling Concurrency in Apex
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Understanding concurrency issues
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Reproducing concurrency problems in Apex
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The active object pattern
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Summary
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6. Anti-patterns and Best Practices
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6. Anti-patterns and Best Practices
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Over usage of formula fields
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Functional decomposition
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Ignoring the equals() and hashcode() methods while performing object comparison
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Circular dependencies
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The ignoring toString() method
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Avoid the God class
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Error hiding
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Hard-coding
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Magic strings and numbers
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Inheritance hell
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SOQL inside a loop
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DML inside a loop
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Summary

Customer support

Now that you are the proud owner of a Packt book, we have a number of things to help you to get the most from your purchase.

Downloading the example code

You can download the example code files for this book from your account at http://www.packtpub.com. If you purchased this book elsewhere, you can visit http://www.packtpub.com/support and register to have the files e-mailed directly to you.

You can download the code files by following these steps:

  1. Log in or register to our website using your e-mail address and password.
  2. Hover the mouse pointer on the SUPPORT tab at the top.
  3. Click on Code Downloads & Errata.
  4. Enter the name of the book in the Search box.
  5. Select the book for which you're looking to download the code files.
  6. Choose from the drop-down menu where you purchased this book from.
  7. Click on Code Download.
You can also download the code files by clicking on the Code Files button on the book's webpage at the Packt Publishing website. This page can be accessed by entering the book's name in the Search box. Please note that you need to be logged in to your Packt account.

Once the file is downloaded, please make sure that you unzip or extract the folder using the latest version of:

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Downloading the color images of this book 

We also provide you with a PDF file that has color images of the screenshots/diagrams used in this book. The color images will help you better understand the changes in the output. You can download this file from https://www.packtpub.com/sites/default/files/downloads/ApexDesignPatterns_ColorImages.pdf.

Errata

Although we have taken every care to ensure the accuracy of our content, mistakes do happen. If you find a mistake in one of our books—maybe a mistake in the text or the code—we would be grateful if you could report this to us. By doing so, you can save other readers from frustration and help us improve subsequent versions of this book. If you find any errata, please report them by visiting http://www.packtpub.com/submit-errata, selecting your book, clicking on the Errata Submission Form link, and entering the details of your errata. Once your errata are verified, your submission will be accepted and the errata will be uploaded to our website or added to any list of existing errata under the Errata section of that title.

To view the previously submitted errata, go to https://www.packtpub.com/books/content/support and enter the name of the book in the search field. The required information will appear under the Errata section.

Piracy

Piracy of copyrighted material on the Internet is an ongoing problem across all media. At Packt, we take the protection of our copyright and licenses very seriously. If you come across any illegal copies of our works in any form on the Internet, please provide us with the location address or website name immediately so that we can pursue a remedy.

Please contact us at with a link to the suspected pirated material.

We appreciate your help in protecting our authors and our ability to bring you valuable content.

Questions

If you have a problem with any aspect of this book, you can contact us at , and we will do our best to address the problem.

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