The deterministic formula field. The nondeterministic formula field. Ignoring the equals and hashcode methods while performing object comparison. Circular dependency in Apex classes. Circular dependency in triggers. The ignoring toString method. All rights reserved. No part of this book may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, without the prior written permission of the publisher, except in the case of brief quotations embedded in critical articles or reviews.
Every effort has been made in the preparation of this book to ensure the accuracy of the information presented. However, the information contained in this book is sold without warranty, either express or implied. Neither the authors, nor Packt Publishing, and its dealers and distributors will be held liable for any damages caused or alleged to be caused directly or indirectly by this book.
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Anshul Verma has been working on the Salesforce platform since Prior to that, he has done extensive development using MS technologies on web, desktop, and mobile applications.
He possesses a tremendous understanding of enterprise-scale systems and has worked in designing intricate systems with high scalability, performance, and robustness. He has been a Dreamforce speaker and is a regular contributor to Stack Exchange and other developer communities.
He has four Salesforce certifications and is currently working as a project manager and technical architect where he is responsible for managing customer success and delivering high-quality solutions to his clients. He has conducted various training sessions in his current organization and trained over 50 new hires.
He is very popular with his training batches and can be often found sharing his knowledge with his team and peers. Jitendra Zaa has been working on the Salesforce platform since He has extensively worked on Java and.
NET-based enterprise applications. He also has experience in working with multiple JavaScript libraries, web frameworks, ETL tools, and databases.
He is an expert in designing and implementing integrations of Salesforce with external systems. He is a regular speaker at the world's biggest developer event, Dreamforce, mostly in developer track. Because of his contributions to the Salesforce community, he has also been awarded the Salesforce MVP title.
He has more than eight Salesforce certifications and works as a Salesforce technical architect. You can follow him on Twitter at JitendraZaa. John M. During that time, he has worked with a variety of technologies and project roles. Currently, he works at FinancialForce. He currently holds multiple certifications from Salesforce. He is currently in the process of attaining the Certified Technical Architect certification.
He loves to spend time with his family, swim at the beach, and work on various open source projects, such as ApexDocs and ApexUML. John has been a technical reviewer for Force. I would like to thank my wife, Allison, for always giving me the freedom to pursue my interests. For support files and downloads related to your book, please visit www. You can upgrade to the eBook version at www.
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It was spring ; we were both discussing our presentation for Dreamforce 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.
Thirdly, some of the design patterns simply do not apply to Force. 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.
Chapter 1, An Introduction to Apex Design Pattern , covers the basics of inheritance, abstract classes, polymorphism, cohesion and coupling, and object-oriented design principles. Chapter 2, Creational Patterns , focuses on different ways to instantiate objects to achieve code reusability, ease of maintenance, and loose coupling.
Chapter 3, Structural Patterns , explains the design patterns that can solve many situations and problems, which occur during project development in Apex, that demand a change in functionalities and cause a ripple effect on the rest of the system.
Chapter 4, Behavioral Patterns , provides a glimpse of some problems, such as double dispatch and code maintenance issues, and explains how to use appropriate design patterns to fix them. Chapter 5, Handling Concurrency in Apex , discusses the design solution for the race condition in concurrency, which can result in data corruption without anyone noticing it. Chapter 6, Anti-patterns and Best Practices , shows some common pitfalls observed during application development in Apex and suggested solutions.
We need an Internet-enabled computer that is capable of running modern browsers supported by Salesforce. We can use the developer console in a browser to write the Apex code in Salesforce. You will also need a free Salesforce developer account to try all the code snippets and examples provided in this book. This book is intended for all Apex developers who want to learn and enhance their Apex code designing skills by applying various design patterns. It can be considered as a stepping stone for beginners or intermediate-level Apex programmers by filling their arsenal with powerful design patterns.
In this book, you will find a number of text styles that distinguish between different kinds of information. Here are some examples of these styles and an explanation of their meaning. Code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles are shown as follows: The AdminGoldSupportImpl and AdminPlatinumSupportImpl classes are written in the same way. Improve this answer. Saroj Bera Saroj Bera Please mark it if answered you question!!!
Thanks for the great response with a working example Saroj! Great answer. Works with FileSaver. This is a great answer! I was able to quickly adjust for my use case and it works amazingly.
For anyone curious. I did this with a file already in the CRM. We need to be able to map files to users and libraries don't work for us, so we use apex to map it and this allows the download. Vinay Chanchlani Vinay Chanchlani 7 7 bronze badges. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog.
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