Practical JRuby

Practical JRuby By David Keener Technical Architect, Voxant Inc.

Overview ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],JRuby is an implementation of the Ruby programming language that runs on the Java Virtual Machine (JVM). By the end of this presentation, you will be able to answer questions like:

A Real-Life Scenario Apache Tomcat JSP Pages Static Content Apache Mongrel Cluster Mongrel (3) Rails App Server 1 Server 2 One Web site at AOL, unified on look-and-feel… … a perfect candidate for JRuby

Ruby Ecosystem Libs/Tools Language Platform ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Java Ecosystem Libs/Tools Language Platform ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

JRuby Libs/Tools Language(s) Platform ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Why Use JRuby? ,[object Object],[object Object],[object Object],[object Object],[object Object]

Adoption Paradigm Rails is in a unique place, just to the left of the “Chasm”. Its capacity for successful delivery of real business applications will probably be a key factor in crossing into “the enterprise.”

The Reality of the Market $ Java Ruby $ $ $ $ $ $ $ * Not to scale

JRuby Installation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

JRuby Commands ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Installation Tip #1 ,[object Object],JRuby has many of the same commands as Ruby, e.g. – “gem”. To run JRuby commands, use the –S option: jruby –S gem install will_paginate But…

Installation Tip #2 ,[object Object],[object Object],JRuby Timeline May 1, 2009: 1.3 RC1 Mar 16, 2009: 1.2 Dec 17, 2008: 1.1.6 Jul 19, 2008: 1.1.3 May 27, 2008: 1.1.2 Apr 22, 2008: 1.1.1 Apr 5, 2008: 1.1 Dec 15, 2008: 1.0.3 Nov 1, 2007: 1.0.2 Aug 23, 2007: 1.0.1 Jun 7, 2007: 1.0

Testing the Installation ,[object Object],[object Object],[object Object],[object Object],[object Object],def powers(count) (0..count).each{ |i| puts 2**i } end powers(10) powers.rb

Installing Gems ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Important Gems ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

An IDE for Java and Ruby You might not need an IDE for Ruby… But you do for Java. Just accept it and move on.

Java Integration ,[object Object],[object Object],[object Object],[object Object],How do you tell JRuby that you want to use Java?

What about Dual-Purpose Code? ,[object Object],[object Object],[object Object],[object Object],What if you have code that needs to run in both Ruby and JRuby?

Yes, You Need CLASSPATH ,[object Object],[object Object],[object Object],[object Object]

Referencing a Java Class ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Ruby-ized Java ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Interfaces ,[object Object],[object Object],[object Object]

Packaging Rails as a War File ,[object Object],[object Object],[object Object],[object Object]

The Java Ecosystem Bloated, over-engineered frameworks Legacy Classes Useful Libraries JFreeChart

What Is JFreeChart? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Supported Chart Types ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Prerequisites for Use ,[object Object],[object Object],[object Object],[object Object]

Where Do You Get It? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Steps to Produce a Chart ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Other Ways to Use JFreeChart ,[object Object],[object Object]

Summary ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Practical JRuby

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Practical JRuby