Browse Library
Sign In Start Free Trial
Close icon Search icon
Account
Browse Library Sign In Start Free Trial

Add to playlist

Create a Playlist

Modal Close icon
You need to login to use this feature.
  • Book Overview & Buying Apex Design Patterns
  • Table Of Contents Toc
Apex Design Patterns

Apex Design Patterns

By : Zaa, Verma
4.7 (9)
Buy this Book
close
close
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)
close
close
close
Preface
chevron up
Icon
Preface
Icon
What this book covers
Icon
What you need for this book
Icon
Who this book is for
Icon
Conventions
Icon
Reader feedback
Icon
Customer support
Lock Free Chapter
1
1. An Introduction to Apex Design Pattern
Icon
1. An Introduction to Apex Design Pattern
Icon
Innovation
Icon
Design patterns and learning
Icon
Object-Oriented Programming (OOP)
Icon
OOPs in play
Icon
An interface
Icon
An abstract class
Icon
Advantages of design patterns
Icon
Design patterns and Apex
Icon
Gang of Four (GoF)
Icon
The SOLID principle
Icon
Summary
2
2. Creational Patterns
Icon
2. Creational Patterns
Icon
Factory method pattern
Icon
Abstract factory pattern
Icon
The singleton pattern
Icon
The builder pattern
Icon
The prototype pattern
Icon
Summary
3
3. Structural Patterns
Icon
3. Structural Patterns
Icon
The facade pattern
Icon
The adapter pattern
Icon
The bridge pattern
Icon
The composite pattern
Icon
The decorator pattern
Icon
The flyweight pattern
Icon
Summary
4
4. Behavioral Patterns
Icon
4. Behavioral Patterns
Icon
The chain of responsibility pattern
Icon
The command pattern
Icon
The interpreter pattern
Icon
The iterator pattern
Icon
The visitor pattern
Icon
The memento pattern
Icon
The observer pattern
Icon
The state pattern
Icon
The strategy pattern
Icon
Summary
5
5. Handling Concurrency in Apex
Icon
5. Handling Concurrency in Apex
Icon
Understanding concurrency issues
Icon
Reproducing concurrency problems in Apex
Icon
The active object pattern
Icon
Summary
6
6. Anti-patterns and Best Practices
Icon
6. Anti-patterns and Best Practices
Icon
Over usage of formula fields
Icon
Functional decomposition
Icon
Ignoring the equals() and hashcode() methods while performing object comparison
Icon
Circular dependencies
Icon
The ignoring toString() method
Icon
Avoid the God class
Icon
Error hiding
Icon
Hard-coding
Icon
Magic strings and numbers
Icon
Inheritance hell
Icon
SOQL inside a loop
Icon
DML inside a loop
Icon
Summary

Preface

It was spring 2015; we were both discussing our presentation for Dreamforce 2015. During the discussion, we stumbled on the topic of the usage of design patterns in Apex. We observed that design patterns are still not extensively used in the Apex programming arena. We think that a few prominent factors for this situation are that there are not enough resources available around the design pattern implementation in Apex. Secondly, most of the Apex programmers who started their development career with Force.com have less exposure to other development platforms. Thirdly, some of the design patterns simply do not apply to Force.com development platforms.

As per our observation, the usage and mention of design patterns in day-to-day programming is reduced in Apex as compared to other development platforms. Developers coming from other programming backgrounds mostly have a working experience with design patterns and it's implicit for them to use it in their code style and design.

We realized that it would be even better to develop content around the design pattern implementation in a language that Apex developers can easily relate to. We positively think that by providing scenarios that are specific to Apex development use cases, developers will be able to understand and implement the design patterns in Apex with ease.

To ensure that we are able to provide information uniformly to all Apex developers irrespective of their experience level, this book also includes general programming best practices, programming principles, OOP concepts, and the usual pitfalls at appropriate places.

In line with our past experience with design pattern learning and implementation is the problem of memorizing the design patterns and situations where they fit in. However, in this book, we took real-life scenarios to explain a situation where an appropriate design pattern will be applied. One can easily relate the design pattern with an example given in this book to identify when it is the time to use that pattern.

Some open source GitHub repository links, Salesforce official developer blogs, and other tips have been shared throughout the book, which can be very helpful in Force.com project development.

CONTINUE READING
83
Tech Concepts
36
Programming languages
73
Tech Tools
Icon Unlimited access to the largest independent learning library in tech of over 8,000 expert-authored tech books and videos.
Icon Innovative learning tools, including AI book assistants, code context explainers, and text-to-speech.
Icon 50+ new titles added per month and exclusive early access to books as they are being written.
Apex Design Patterns
Next Section
notes
bookmark Notes and Bookmarks search Search in title playlist Add to playlist font-size Font size

Change the font size

margin-width Margin width

Change margin width

day-mode Day/Sepia/Night Modes

Change background colour

Close icon Search
Country selected
Close icon Your notes and bookmarks

Confirmation

Modal Close icon
claim successful
Order Page Read Now

Buy this book with your credits?

Modal Close icon
Are you sure you want to buy this book with one of your credits?
Close
YES, BUY

Submit Your Feedback

Modal Close icon
Modal Close icon
Modal Close icon