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  • Book Overview & Buying Clojure Web Development Essentials
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Clojure Web Development Essentials

Clojure Web Development Essentials

By : Baldwin
4.5 (6)
Buy this Book
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Clojure Web Development Essentials

Clojure Web Development Essentials

4.5 (6)
By: Baldwin
Buy this Book

Overview of this book

This book is for anyone who's worked with Clojure and wants to use it to start developing applications for the Web. Experience or familiarity with basic Clojure syntax is a must, and exposure to Leiningen (or other similar build tools such as Maven) would be helpful.
Table of Contents (14 chapters)
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Preface
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Preface
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What this book covers
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What you need for this book
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Who this book is for
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Conventions
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Reader feedback
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Customer support
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1
1. Getting Started with Luminus
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1. Getting Started with Luminus
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Leiningen
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Dependencies of the app
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Luminus file structure
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Summary
2
2. Ring and the Ring Server
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2. Ring and the Ring Server
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Understanding Ring in Clojure
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What is the Ring Server?
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Configuring and running the Ring Server
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Summary
3
3. Logging
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3. Logging
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What is Timbre?
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Configuring a Timbre appender
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Logging with Timbre
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Adding an appender
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Summary
4
4. URL Routing and Template Rendering
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4. URL Routing and Template Rendering
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What is Compojure?
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Creating a Compojure route
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What is Selmer?
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Creating your first page
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Editing the home page
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Serving the signup form
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Creating the signup page
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Summary
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5. Handling Form Input
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5. Handling Form Input
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Handling the form POST
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Validating the form POST
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Summary
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6. Testing in Clojure
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6. Testing in Clojure
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The necessity of testing
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Anatomy of a test
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Writing and running our first test
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Writing a high-level integration test
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Summary
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7. Getting Started with the Database
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7. Getting Started with the Database
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Creating the database schema
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Maintaining the database schema
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Adding data to the database
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Summary
8
8. Reading Data from the Database
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8. Reading Data from the Database
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Creating the catalog
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Fetching albums from the database
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Creating the recently added route
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Rendering the results
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An exercise!
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Summary
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9. Database Transactions
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9. Database Transactions
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Introduction to Database Transactions
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The ACID properties
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Importance of database transactions
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Implementing a transaction
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Extending the application requirements in brief
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Summary
10
10. Sessions and Cookies
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10. Sessions and Cookies
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Sessions
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Setting up sessions
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Interacting with the session
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Restricted routes
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Cookies
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Extending the application: brief requirements
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Summary
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11. Environment Configuration and Deployment
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11. Environment Configuration and Deployment
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Environ
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Setting and resolving environment configurations
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Adjusting the database connection
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Deploying the hipstr application
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Summary
12
A. Using Korma – a Clojure DSL for SQL
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A. Using Korma – a Clojure DSL for SQL
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Getting Korma
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The Quick Korma Crash Course
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Port the models from YeSQL to Korma
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Index
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Index

Chapter 3. Logging

We've read patiently and slugged our way through Chapter 2, Ring and the Ring Server, learning the technicalities about request and response maps, handlers, middleware, and adapters. The time has come for us to start getting our hands dirty.

Logging is a wonderful tool in development, and is essential for successfully debugging a system that's gone completely haywire. Logging is the eyes, ears, and mouth of our system. It is our saving grace. However, logging traditionally has a dark side. If you've ever used Java or .NET, you'll be well versed in log4j and log4net, and all the excruciatingly painful configurations that go along with it. While logging is extremely useful, setting it up correctly is nothing short of a clinic in patience.

In this chapter, you will learn:

  • How to configure Timbre for logging
  • How to reconfigure one of the appenders configured by Luminus
  • How to configure a new appender from scratch
  • How to emit logging statements
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Programming languages
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