RubyConf Uruguay 2010 - JRuby

JRuby The Best of Both Worlds

Me • Charles Oliver Nutter • JRuby Architect at Engine Yard • Java developer since 1997 • JRuby developer since 2005 • @headius, headius@headius.com

JRuby • Ruby on JVM • Latest release: 1.5.3 • Ruby 1.8.7 compat, 1.9.2 coming • It’s Just Ruby! • (It’s Not Just Ruby!)

If you... ...want or need to run on JVM... ...JRuby is the answer!

If you... ...need to use a Java library... ...JRuby is the answer!

If you... ...want the best GC(s) in the world... ...JRuby is the answer!

If you... ...hate dealing with native libraries... ...JRuby is the answer!

If you... ...need to develop or deploy on Windows... ...JRuby is the answer!

If you... ...need to develop or deploy on zLinux... ...JRuby is the answer!

If you... ...need to develop or deploy on AS/400... ...JRuby is the answer!

If you... ...need to develop or deploy on OpenVMS... ...JRuby is the answer!

If you... ...want to build Android apps in Ruby... ...JRuby is the answer!

If you... ...want to integrate with other languages like Clojure, Scala, Mirah... ...JRuby is the answer!

Boring Stuff • Trivial install: unpack, run (only prereq: Java) • Performance is great, ~1.9 • Rails etc run great • Production users since 2007 • Most mature, most stable alternative Ruby

Installation • Step 1: unpack JRuby

Installation • Java (easy on any platform) • Download, unpack JRuby • Or use rvm, pik, apt-get, yum, etc • Add bin/ to PATH • Done!

Installation (alternative) • Download an IDE • NetBeans • Eclipse (RadRails) • IntelliJ (main product or RubyMine)

Cool Stuff • Java/JVM integration • Deployment • Native threads (real concurrency!) • Tooling and maturity • New frontiers

Platform Integration • Use any Java library like it’s a Ruby library • No-compile, single-ﬁle deployments • Cross-platform GUI libraries

Fun With JRuby

Deployment • Typical Ruby servers work • Thin, Mongrel • GlassFish, Trinidad, Aspen, Jetty-Rails, ... • Java WAR ﬁle deployment • Any Java app server can run Rails!

Rails in a WAR File ~/projects/jruby/testapp ➔ gem install warbler Successfully installed warbler-1.2.1 1 gem installed Installing ri documentation for warbler-1.2.1... Installing RDoc documentation for warbler-1.2.1... ~/projects/jruby/testapp ➔ warble rm -f testapp.war Creating testapp.war ~/projects/jruby/testapp ➔ ls -l testapp.war -rw-r--r-- 1 headius staff 17812893 Oct 30 13:08 testapp.war

Command-line Server ~/projects/jruby/testapp ➔ gem install trinidad Successfully installed trinidad_jars-0.3.2 Successfully installed jruby-rack-1.0.3 Successfully installed trinidad-0.9.12 3 gems installed Installing ri documentation for trinidad_jars-0.3.2... Installing ri documentation for jruby-rack-1.0.3... Installing ri documentation for trinidad-0.9.12... Installing RDoc documentation for trinidad_jars-0.3.2... Installing RDoc documentation for jruby-rack-1.0.3... Installing RDoc documentation for trinidad-0.9.12...

Command-line Server ~/projects/jruby/testapp ➔ trinidad -e production Oct 30, 2010 1:15:26 PM org.apache.coyote.http11.Http11Protocol init INFO: Initializing Coyote HTTP/1.1 on http-3000 Oct 30, 2010 1:15:26 PM org.apache.catalina.core.StandardService startInternal INFO: Starting service Tomcat Oct 30, 2010 1:15:26 PM org.apache.catalina.core.StandardEngine startInternal INFO: Starting Servlet Engine: Apache Tomcat/7.0.2 Oct 30, 2010 1:15:26 PM org.apache.catalina.startup.ContextConfig webConfig INFO: No global web.xml found Oct 30, 2010 1:15:28 PM org.apache.catalina.core.ApplicationContext log INFO: Info: using runtime pool timeout of 30 seconds Oct 30, 2010 1:15:28 PM org.apache.catalina.core.ApplicationContext log INFO: Info: received min runtimes = 1 Oct 30, 2010 1:15:28 PM org.apache.catalina.core.ApplicationContext log INFO: Info: received max runtimes = 5 Oct 30, 2010 1:15:36 PM org.apache.catalina.core.ApplicationContext log INFO: Info: add application to the pool. size now = 1 Oct 30, 2010 1:15:36 PM org.apache.coyote.http11.Http11Protocol start INFO: Starting Coyote HTTP/1.1 on http-3000

Native Threads • Ruby Thread :: Native Thread • Thread.new # real system-level thread • One process can saturate all cores • One Rails instance for a whole site

Threadsafe Mode ~/projects/jruby/testapp ➔ trinidad -e production --threadsafe Oct 30, 2010 1:17:05 PM org.apache.coyote.http11.Http11Protocol init INFO: Initializing Coyote HTTP/1.1 on http-3000 Oct 30, 2010 1:17:05 PM org.apache.catalina.core.StandardService startInternal INFO: Starting service Tomcat Oct 30, 2010 1:17:05 PM org.apache.catalina.core.StandardEngine startInternal INFO: Starting Servlet Engine: Apache Tomcat/7.0.2 Oct 30, 2010 1:17:05 PM org.apache.catalina.startup.ContextConfig webConfig INFO: No global web.xml found Oct 30, 2010 1:17:15 PM org.apache.coyote.http11.Http11Protocol start INFO: Starting Coyote HTTP/1.1 on http-3000 No pool of JRuby runtimes!

A “Slow” Action class TestController < ApplicationController def slow # simulate a blocking call sleep 1 render :text => 'All done!' end end

No Concurrent Requests ~ ➔ ab -n 50 http://localhost:3000/test/slow This is ApacheBench, Version 2.3 <$Revision: 655654 $> ... Requests per second: 0.96 [#/sec] (mean) Time per request: 1037.188 [ms] (mean) Time per request: 1037.188 [ms] (mean, across all concurrent requests) Transfer rate: 0.30 [Kbytes/sec] received Connection Times (ms) min mean[+/-sd] median max Connect: 0 0 0.1 0 0 Processing: 1005 1037 116.3 1008 1705 Waiting: 1005 1037 116.2 1008 1705 Total: 1006 1037 116.3 1008 1705 ...

5 Concurrent Requests ~ ➔ ab -c 5 -n 50 http://localhost:3000/test/slow This is ApacheBench, Version 2.3 <$Revision: 655654 $> ... Requests per second: 4.95 [#/sec] (mean) Time per request: 1010.680 [ms] (mean) Time per request: 202.136 [ms] (mean, across all concurrent requests) Transfer rate: 1.54 [Kbytes/sec] received Connection Times (ms) min mean[+/-sd] median max Connect: 0 0 0.1 0 1 Processing: 1005 1010 5.6 1007 1029 Waiting: 1004 1009 5.5 1007 1029 Total: 1005 1010 5.6 1007 1029

Tooling and Maturity • Editor/IDE support with bonuses • Debugging tools • Proﬁling, memory tools • Commercial JVM environments • Richest tools of any Ruby

VisualVM

CPU Monitor

Heap Monitor

Heap Dump

CPU/Memory Proﬁling Live results!

New Frontiers • Google AppEngine • Java or Python only (...or JRuby!) • Android • “Java”-mostly (...or JRuby!) • Anywhere with a Java server • Deploy like any other application

Ruboto!

Ruboto: Ruby for Android • Ruboto IRB • ruboto-core • Ruby Summer of Code • Daniel Jackoway • App generator, utilities • More to come, you can help!

ruboto-core gem ~/projects ➔ gem install ruboto-core Successfully installed ruboto-core-0.0.2 1 gem installed Installing ri documentation for ruboto-core-0.0.2... Installing RDoc documentation for ruboto-core-0.0.2...

Generate App ~/projects ➔ ruboto gen app --name RubyConfUY --target android-8 -- package org.headius.demo.rubyconfuy --activity RubyConfUY --path rubyconfuy_demo Generating Android app RubyConfUY in /Users/headius/projects/ ruboto-core/rubyconfuy_demo...Done Copying files: Rakefile...Done .gitignore...Done assets...Done JRuby jars...Done Ruboto java classes...Done Adding RubotoActivity and RubotoDialog to the manifest...Done Setting the package name in ruboto.rb...Done Generating the default Activity and script...Done Hello, RubyConfUY

Build App ~/projects ➔ cd rubyconfuy_demo/ ~/projects/rubyconfuy_demo ➔ rake (in /Users/headius/projects/rubyconfuy_demo) Android SDK Tools Revision 6 Project Target: Android 2.2 API level: 8 WARNING: No minSdkVersion value set. Application will install on all Android versions. Importing rules file: platforms/android-8/ant/ant_rules_r2.xml mkdir -p generated_libs ...

Deploy App ~/projects/rubyconfuy_demo ➔ adb install -r bin/RubyConfUY-debug.apk 788 KB/s (2718474 bytes in 3.367s) pkg: /data/local/tmp/RubyConfUY-debug.apk Success

Ruboto

Your Turn • Just try it! • Tell everyone • Let us know what you need

JRuby Book!

For The Managers • Three fulltime devs at Engine Yard • Support, professional services • And OSS-style IRC/email support • Engine Yard Cloud (soon!) • Well-established, mature, stable • Enterprise-ready!

Production Users • Oslo Airport refueling terminals • LinkedIn’s “Signal” social aggregator • BankSimple • Oracle Mix, Kenai • Thoughtworks • Github FI (Firewall Install)

More? • Madness: 3D game in JRuby • Redcar: JRuby-based textmate clone

JRubyMonkeyEngine • JRuby wrapper around JMonkeyEngine • 3D scenegraph and physics engine • Write 3D games entirely in Ruby • Deploy on multiple platforms • No recompile...just ship the JME libs!

Madness!

Redcar • Clone of textmate using JRuby + SWT • Almost entirely Ruby • Easy to hack, improve • gem install redcar • sudo redcar install

Redcar

Thanks! • http://jruby.org • http://wiki.jruby.org • http://bugs.jruby.org • http://engineyard.com/jruby • http://blog.headius.com

RubyConf Uruguay 2010 - JRuby

by Charles Nutter

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