“There’s something for everyone here. . . . You can pick up and read this book and build an industry-standard system in a weekend: It has everything you need to get started with a new project. I also found it helpful in reviewing the structure of existing projects.” —Timothy Pratley, developer  Developers are discovering the exceptional power of Clojure’s functional programming model to quickly solve problems in domains ranging from social networking to Big Data. Clojure is fast and efficient—ideal for rapid prototyping and lean development. And it is highly expressive and extremely extensible, which makes Clojure one of today’s leading tools for software innovation. Since it targets the Java Virtual Machine, Clojure also leverages the Java platform’s maturity and enormous ecosystem.   Clojure Recipes is a wide-ranging, up-to-date “code recipe book” for this increasingly popular language. With practical and self-contained examples, author Julian Gamble illuminates Clojure’s key features and best practices, showing how to solve real-world problems one step at a time. Focusing on Clojure 1.7 and higher, Gamble fully reflects recent enhancements that ensure you’re getting the most up-to-date code for your project.   Gamble first walks you through the essential steps required to set up your Clojure development environment, from setting up the Leiningen build tool to packaging Clojure for Java EE environments. He then shows you how to build both basic and advanced REST servers, before turning to a wide range of increasingly sophisticated applications.   In this book you will find Innovative Clojure code for diverse web, security, administration, and development tasks, from log reading and app monitoring to software testing Detailed instructions for using concurrency primitives, writing new DSLs, simplifying cloud database development, and more “Learn by doing” projects, which offer practical experience with Clojurescript, Storm, Pedestal, Datomic, and other advanced tools Coverage of using Clojure with Cascalog 2.0 to write complex Hadoop queries with minimal code  The breadth and quality of Gamble’s examples make Clojure Recipes uniquely valuable both to developers who are exploring Clojure for the first time and to those already using it in production.

Table of Contents:
Preface xv About the Author xix   Chapter 1: Starting Your Project with Leiningen 1 Assumptions 1 Benefits 1 The Recipe–Windows 1 The Recipe–Mac 3 Conclusion 4 Postscript–Setting Up a JDK on a Mac 4 Postscript–Setting Up a JDK on Windows 6   Chapter 2: Packaging Clojure for a Java EE Environment 11 Assumptions 11 Benefits 11 The Recipe–Common 11 Conclusion 14 Postscript–Setting Up Tomcat on a Mac 14 Postscript–Setting Up Tomcat on Windows 16   Chapter 3: Creating a REST Server in Compojure 19 Assumptions 19 Benefits 19 The Recipe–Code 19 Testing the Solution 20 Notes on the Recipe 22 Conclusion 23   Chapter 4: Creating a REST Server with Liberator 25 Assumptions 25 Benefits 25 The Recipe–Code 25 Testing the Solution 28 Notes on the Recipe 29 Context 32 Conclusion 33   Chapter 5: A REST Client in ClojureScript 35 Assumptions 35 Benefits 35 The Recipe–Code 36 Testing the Solution 38 Notes on the Recipe 39 Conclusion 40   Chapter 6: A Simple JSON Server 41 Assumptions 41 Benefits 41 The Recipe–Code 41 Testing the Solution 44 Notes on the Recipe 45 Conclusion 47   Chapter 7: A Simple Server Using the Pedestal Framework 49 Assumptions 49 Benefits 49 Context 49 The Recipe–Code 50 Testing the Solution 52 Notes on the Recipe 53 Conclusion 54   Chapter 8: A Stock Ticker on the Pedestal Framework Server 55 Assumptions 55 Benefits 55 The Recipe–Code 55 Testing the Solution 60 Notes on the Recipe 62 Conclusion 67   Chapter 9: Simplifying Logging with a Macro 69 Assumptions 69 Benefits 69 The Recipe–Code 70 Testing the Solution 72 Notes on the Recipe 74 Conclusion 76   Chapter 10: Extending the Compiler with a Macro 79 Assumptions 79 Benefits 79 The Recipe–Code 79 Testing the Solution 81 Notes on the Recipe 82 Conclusion 85   Chapter 11: Simplifying Datomic Syntax by Writing a DSL 87 Assumptions 87 Benefits 87 The Recipe–Code 88 Testing the Solution 97 Notes on the Recipe 103 Conclusion 106   Chapter 12: Reading the SASS DSL and Generating CSS with Clojure Zippers 107 Assumptions 107 Benefits 107 Outline–Features of SASS 107 The Recipe–Code 109 Testing the Solution 121 Notes on the Recipe 122 Conclusion 133   Chapter 13: Introduction to Cascalog 135 Assumptions 135 Benefits 135 The Recipe–Code 135 Testing the Solution 137 Notes on the Recipe 139 Conclusion 141   Chapter 14: Cascalog and Hadoop 143 Assumptions 143 Benefits 143 The Recipe–Code 143 Testing the Solution 145 Conclusion 146 Postscript–Setting Up Hadoop on a Mac 146 Postscript–Setting Up Hadoop on a Windows Machine 147   Chapter 15: Loading a Data File into Cascalog 149 Assumptions 149 Benefits 149 The Recipe–Code 149 Testing the Solution 150 Conclusion 151   Chapter 16: Writing Out a Data File with Cascalog 153 Assumptions 153 Benefits 153 The Recipe–Code 153 Testing the Solution 154 Notes on the Recipe 155 Conclusion 155   Chapter 17: Cascalog and Structured Data 157 Assumptions 157 Benefits 157 The Recipe–Code 157 Testing the Recipe 159 Notes on the Solution 160 Conclusion 161   Chapter 18: Loading Custom Data Formats into Cascalog 163 Assumptions 163 Benefits 163 The Recipe–Code 163 Testing the Recipe 175 Notes on the Solution 176 Conclusion 177   Chapter 19: Connecting to Datomic from Your Application 179 Assumptions 179 Benefits 179 The Recipe–Code 179 Conclusion 188   Chapter 20: Getting Started with Storm 189 Assumptions 189 Benefits 189 The Recipe–Code 190 Testing the Recipe 192 Notes on the Recipe 192 Conclusion 195   Chapter 21: Getting Started with JMS in Clojure 197 Assumptions 197 Benefits 197 The Recipe–Code 197 Testing the Recipe 200 Notes on the Recipe 200 Conclusion 201   Chapter 22: Integrating Storm and JMS 203 Assumptions 203 Benefits 203 The Recipe–Code 203 Testing the Recipe 213 Notes on the Recipe 213 Conclusion 215   Chapter 23: A CSV Reader 217 Assumptions 217 Benefits 217 The Recipe–Code 217 Testing the Solution 219 Notes on the Recipe 219 Conclusion 220   Chapter 24: Detecting Errors with a Log Monitoring Application 221 Assumptions 221 Benefits 221 The Recipe–Code 221 Testing the Solution 223 Notes on the Recipe 223 Conclusion 224   Chapter 25: Bundling Clojure as an Ant Plug-in 225 Assumptions 225 Benefits 225 The Recipe–Code 225 Testing the Recipe 227 Notes on the Recipe 228 Conclusion 228 Postscript–Installing Ant on a Mac 229   Chapter 26: Bundling Clojure as a Maven Plug-in 231 Assumptions 231 Benefits 231 The Recipe–Code 231 Testing the Recipe 239 Notes on the Recipe 240 Conclusion 240   Chapter 27: Integrating Clojure by Scripting Web Tests 241 Assumptions 241 Benefits 241 The Recipe–Code 241 Testing the Recipe 242 Notes on the Recipe 243 Conclusion 243   Chapter 28: Monitoring Availability with a Website Status Checker 245 Assumptions 245 Benefits 245 The Recipe–Code 246 Testing the Recipe 247 Notes on the Recipe 249 Conclusion 249   Appendix A: Debugging Macros 251 Assumptions 251 Benefits 251 The Recipe 251 Conclusion 259   Index 261