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Building modern business applications : reactive cloud architecture for Java, Spring, and PostgreSQL / Peter Royal.

Royal, Peter, author.
2023
QA76.73.J38 R69 2023
Available Online
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Title
Building modern business applications : reactive cloud architecture for Java, Spring, and PostgreSQL / Peter Royal.
Author
Royal, Peter, author.
ISBN
9781484289921 electronic book
1484289927 electronic book
1484289919
9781484289914
DOI
https://doi.org/10.1007/978-1-4842-8992-1
Published
New York, NY : Apress, [2023]
Language
English
Description
1 online resource (189 p.)
Item Number
10.1007/978-1-4842-8992-1 doi
Call Number
QA76.73.J38 R69 2023
Dewey Decimal Classification
658/.05
Summary
Discover a new way of thinking about business applications in light of the massive industry shift toward cloud computing and reactive programming technologies. This book synthesizes technologies and techniques such as event sourcing, command query responsibility segregation (CQRS), property-based testing, and GraphQL into a cohesive guide for modern business applications that benefit every developer. The book begins with a look at the fundamentals of modern business applications. These fundamentals include business rules and the managing of data over time. The benefits of reactive techniques are explained, including how they are fundamentally aligned with what application developers strive to achieve in their work. Author Peter Royal equips you with sound guidance to follow as you evolve your existing systems, as well as examples of how to build those systems using modern techniques in Spring, Java, and PostgreSQL. What You Will Learn Architect business applications for cloud-based environments Design sustainable business applications Integrate GraphQL best practices into business applications Use property-based testing to exhaustively test possible system states Think about business applications in terms of message flows Relate the benefits of reactive systems to business goals Model time appropriately for business requirements Who This Book Is For Practicing software developers who are building business applications, developers who are being asked to deploy into cloud environments that are more volatile than statically provisioned data centers, developers who want to increase the reliability of their systems and are struggling to find the right paradigms and architectures to achieve their goals, developers who see and use capabilities in software in other areas of their lives and want to bring those capabilities into their own work, and developers with experience designing other types of software who want to learn how to design business applications.
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Building Modern Business Applications
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Intro
Table of Contents
About the Author
About the Technical Reviewer
Acknowledgments
Introduction
Part I: Business Applications
Chapter 1: What Is a Business Application?
Business Software
Domain Specific
How It Is Used
Measuring Importance
"Modern"
Summary
Chapter 2: The Status Quo (and How It Came to Be)
Business Application Architectures
The Status Quo
Green Screen
Rich Client
Web Applications
The Rise of Consumer Applications
Concurrent Practices
Agile
Test-Driven Development
Continuous Integration and Delivery

Observability
Summary
Part II: Design Prerequisites
Chapter 3: What Is a Reactive System?
What Is Reactive?
Reactive Manifesto
Responsive
Resilient
Elastic
Message Driven
Composing a Reactive System
Summary
Chapter 4: Why Build Business Applications As Reactive Systems?
Business Expectations
Developer Expectations
Property Alignment
Responsive
Resilient
Elastic
Message Driven
Summary
Chapter 5: What Is a Business Rule?
Thinking About Business Rules
Categorizations
Data at Rest
Side Effects
Derivable Data
Summary

Chapter 6: Managing Time
Answering "What Happened?"
Tracking Changes
Why Did That Happen?
Events
Commands
Understanding Time
Serialization of Time
Eventual Consistency
Bitemporality
Business Rule Changes
Summary
Part III: Design
Chapter 7: Constraints and Principles
Constraints
From REST to a Graph
Falcor
GraphQL
Why GraphQL
Being Real-Time
Principles
Never Forget
Message Driven
Read/Write Separation
Partial Availability
Design Flexibility
Modularity
Testability
Amenability to Change
Summary

Chapter 8: High-Level Data Flow
Event Sourcing and CQRS
Thinking in GraphQL Schemas
Scalars and Enums
Objects
Lists
Input Objects
Interfaces and Unions
Queries and Subscriptions
Mutations
Combining GraphQL + ES + CQRS
Summary
Chapter 9: Command Processor
What It Is, and Is Not
Requirements
Composing the Core Loop
Handling Failures
Infrastructure
Application
Enforcing Business Rules
How to Test
Testing the Command Processor
Testing Your Code
Summary
Chapter 10: Command Generator
Interaction with GraphQL

From Input Arguments into a Command
Appending to the Command Log
Returning the Mutation Result
Commands and Other Required Data
Handling Failures
Optimistic Locking
Timeouts
Testing the Command Generator
Command Submission
Command Creation
Summary
Chapter 11: Event Materializer
Defining the View Model
Event Materializer Behavior
Transactions
Consistency
Multiple Sources
Evolving the View Model
Communicating Changes to Others
GraphQL Subscriptions
Other Side Effects
Managing Failure
Testing
Summary

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