To get the most out of this book

The Java Development Kit (JDK) is required to run and develop applications using Clojure. You can get the JDK from http://www.oracle.com/technetwork/java/javase/downloads/index.html. It is also recommended that you use a text editor or an integrated development environment (IDE) of your choice for implementation. Some of the examples in the chapters require Linux as an operating system.

Download the example code files

You can download the example code files for this book from your account at www.packtpub.com. If you purchased this book elsewhere, you can visit www.packtpub.com/support and register to have the files emailed directly to you.

You can download the code files by following these steps:

1. Log in or register at www.packtpub.com.
2. Select the SUPPORT tab.
3. Click on Code Downloads & Errata.
4. Enter the name of the book in the Search box and follow the onscreen instructions.

Once the file is downloaded, please make sure that you unzip or extract the folder using the latest version of:

• WinRAR/7-Zip for Windows
• Zipeg/iZip/UnRarX for Mac
• 7-Zip/PeaZip for Linux

The code bundle for the book is also hosted on GitHub at https://github.com/PacktPublishing/Microservices-with-Clojure. We also have other code bundles from our rich catalog of books and videos available at https://github.com/PacktPublishing/. Check them out!

Conventions used

There are a number of text conventions used throughout this book.

CodeInText: Indicates code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles. Here is an example: "The persistence protocol ServiceDB consists of upsert, entity, and delete functions."

A block of code is set as follows:

{
  "query": {
    "term": {
      "status": "O"
    }
  }
}

When we wish to draw your attention to a particular part of a code block, the relevant lines or items are set in bold:

(defn home-page
  [request]
  (log/counter ::home-hits 1)
  (ring-resp/response "Hello World!"))

Any command-line input or output is written as follows:

% lein run
Noname | Hello, World!

% lein run Clojure
Clojure | Hello, World!

Bold: Indicates a new term, an important word, or words that you see onscreen. For example, words in menus or dialog boxes appear in the text like this. Here is an example: "Click on the Create a visualization button."

Warnings or important notes appear like this.

Tips and tricks appear like this.