Using a Context

In this module, you’re going to learn:

• The problem a context solves
• How the Context API is organized
• How to write to and read from the context

You can find the code for this module here.

You can also read the context from a Reactive Stream signal. The Signal interface has a method that returns a ContextView instance:

ContextView getContextView()

For more information, read the appendix C.7 from the documentation: What Is a Good Pattern for Contextual Logging? (MDC)

For a real-world example, Spring Security uses the Context API to provide a reactive web filter: ReactorContextWebFilter.

Links

• ThreadLocal
• Javadoc for Mono
• Javadoc for Flux

Table of contents

• The Problem a Context Solves
• The Context API
• Writing and Reading the Context
• Coding Exercises