Fong - Java Interceptor Development with ByteBuddy: Fundamental

Java Interceptor Development with ByteBuddy: Fundamental Copyright 2020, by MillionStrengthKnowledge.com, All rights reserved. The publication of the book and source code are protected by copyright, and permission must be obtained from the MillionStrengthKnowledge. com prior to any prohibited reproduction, storage in a retrieval system, or transmission in any form or by any means, electronic, mechanical, photocopying, recording, or likewise. Every effort has been made in the preparation of this book and source code to ensure the accuracy of the information presented. However, the information contained in this book and source code are sold without warranty and guarantee, either express or implied, as to the accuracy or completeness of or results to be obtained from using the book and source code. Neither the MillionStrengthKnowledge.com, author, nor its dealers and distributors will be held liable for any damages caused or alleged to be caused directly or indirectly by this book and source code.

Under no circumstances shall MillionStrengthKnowledge.com, author, its dealers and distributors be liable for any indirect, incidental, special, punitive, consequential or similar damages that result from the use of or inability to use the book and source code, even if any of them has been advised of the possibility of such damages. This limitation of liability shall apply to any claim or cause whatsoever whether such claim or cause arises in contract, tort or otherwise. First published: October 2020 https://millionstrengthknowledge.com Unique Number: 18790-01-63329-3

Author My name is Eric Fong. I started my career as a software developer since 2001. I am experience in developing web application using Java, JavaEE and SpringFramework. I received a Master Degree in Management Information System from Coventry University.

I am a Oracle Certified Java Programmer, EC-Council Certified Application Security Engineer in Java, and Arcitura Certified Microservice Architect. I am the founder of MillionStrengthKnowledge.com. I created the GWT 2.8.1 Declarative User Interface Web Application Development Self Pace Training in year 2017, and ebook in year 2018. In year 2018, I also published another ebook titled GWT Responsive Web Application: Problem Solution Approach. I am very interested in Java and web application development, I enjoy doing research and development in Java during my spare time. Acknowledgement I would like to acknowledge the ByteBuddy project contributors that have put their great effort to make the ByteBuddy a successful open source library.

ByteBuddy is an open source Java based library for Java bytecode generation and manipulation. ByteBuddy is licensed under Apache License Version 2.0, and is freely available on Github. Appreciate the open source communitys contribution, and the project constributor, Rafael Winterhalter, who has very actively participant in the github and stackoverflow forum to answer the technical question for the ByteBuddy.

The learner of this book The learner of this book should have knowledge in Java programming. This book is created for the learner who wants to learn on how to develop interceptor and Java code generation using ByteBuddy, and those who have knowledge in aspect oriented programming and wants to explore how ByteBuddy can develop the interceptor that has the result of aspect oriented code. Source code Source code can be downloaded using different methods.

The method depends on which bookstore website learner purchases the ebook. If learner purchases the ebook from gumroad, then learner can download the source code from gumroad directly. If learner purchases the ebook from other websites, then please refer to this webpage for information about how to download the source code: https://millionstrengthknowledge.com/#path- r=sourcecodeguideline.html For general guideline, if the bookstore website is not gumroad, then learner is required to email the source code request to: sourcecode@millionstrengthknowledge.com The email must include either the receipt, invoice, order, or license number of the book purchased. After that, learner will receive an email reply that contains the source code zip file: javainterceptor.7z. The zip file is password protected. The password to unzip the zip file is the learners email address.

Please refer to the URL stated above to learn about how to create the email of the source code request.

Contents Chapter 1: Introduction ByteBuddy is an open source Java based library for Java bytecode generation and manipulation. ByteBuddy is licensed under Apache License Version 2.0, and is freely available on Github. This book uses the term instrumentation to describe the bytecode generation, manipulation, and interception. This book provides example codes that applies ByteBuddy capability to intercept, add, modify and delete existing functionality of one or more Java classes by modifying their bytecode. With ByteBuddy, the instrumentation process can occur during maven build time, or application runtime.

Modern applications tend to be complex in nature because the application needs to fulfill different type of requirements, for example, functional requirement and non-functional requirement. These applications contains multiple modules with each of them has their own functional code. Because of the non-functional requirements, the functional code is surrounded by non-functional code, for example, security processing, logging, performance monitoring, resource usage tracing for pay-per-use billing, DevOps related processing, and others. public double calculatePrice(){ double discount = getDiscount(); return this.price + this.deliveryCharge - discount; } calculatePrice method without non-functional code