Intro To Grails
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Intro To Grails

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Robert Fischer (Smokejumper Consulting)'s presentation introducing Grails given to the Triangle Java User Group.

Robert Fischer (Smokejumper Consulting)'s presentation introducing Grails given to the Triangle Java User Group.

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    Intro To Grails Intro To Grails Presentation Transcript

    • Smokejumping Grails Robert Fischer, Smokejumper Consulting robert . fischer @ SmokejumperIT . com Presented Nov 17th, 2008 at the Triangle Java User Group (TriJUG) Tuesday, November 18, 2008 1
    • Hi, I’m Robert Tuesday, November 18, 2008 2
    • Math Major Tuesday, November 18, 2008 3
    • Born and Raised in Perl Tuesday, November 18, 2008 4
    • Agile Java Consultant Tuesday, November 18, 2008 5
    • Technical Blogger EnfranchisedMind.com • The Joy of BDD, or, Re-writing Your Code in Mocks and Asserts is Not Unit Testing • Functional (Meta)?Programming Stunts for Ruby and Groovy (and a Little Perl) • 7 Actually Useful Things You Didn’t Know Static Typing Could Do: An Introduction for the Dynamic Language Enthusiast • A Defense of Prototypes, or, Why Does Tom Christiansen Hate Perl? Tuesday, November 18, 2008 6
    • Groovy/Grails Fanboy • Introduced to Groovy/Grails at Carol.com, Active in Groovy Users of Minnesota • Uses Grails as freelancer to quickly develop prototype applications • Regular on IRC: FreeNode #groovy, #grails • Active on Groovy and Grails mailing lists • Autobase and BackgroundThread plugin Tuesday, November 18, 2008 7
    • All Web App Development Should Be Grails Tuesday, November 18, 2008 8
    • No, Really. • Stunningly simple development. • Succinct code using a superset of Java. • Sane defaults, straightforward configuration. • Static typing as deemed useful by developer. • Standard deployment approach. • SpringSource backed and here to stay. Tuesday, November 18, 2008 9
    • What Is Grails? • Web application development framework/ environment leveraging Java and Groovy. • Convention-based MVC development with a set of powerful command-line tools. • Powered by pre-configured and pre- integrated Spring, Hibernate, SiteMesh, and JUnit. Tuesday, November 18, 2008 10
    • How Would You Like Your Grails? • Conceptually thin dynamic MVC framework • Dynamic, succinct domain and controllers • Run from source code check-out • Mash-up with extensible plugin architecture • Actually approachable best-of-breed Java stack • Prepackaged Java environment and build system • Builds a WAR to plug into existing deployments • Hooks for existing Spring and Hibernate config Tuesday, November 18, 2008 11
    • Grails Before Your Very Eyes! Live Coding! Tuesday, November 18, 2008 12
    • But Wait, There’s More! Plugins • Functional Testing webtest, selenium, fitnesse • Rich User Interface (RIA) grails-ui, richui, gwt, flex, yui, iui • Database Management: Autobase • Background Tasks: BackgroundThread • And dozens more: http://grails.org/plugins Tuesday, November 18, 2008 13
    • Autobase • Manages database state using a non-linear collection of database change sets. • Leverages existing Grails database automation to minimize effort. • Provides a Liquibase-based embedded DSL for database migrations. • http://github.com/RobertFischer/autobase/ wikis/ Tuesday, November 18, 2008 14
    • Example Migration changeSet(id:'rename_bar_to_baz', author:'Robert') { dropColumn(tableName:'foo', columnName:'baz') renameColumn(tableName:quot;fooquot;, oldColumnName:quot;barquot;, newColumnName:quot;bazquot;) } Tuesday, November 18, 2008 15
    • Background Thread • Provides a Spring bean that will execute arbitrary closures in the background. • Handles some awkwardness around Hibernate sessions, and provides thread pooling and logging. • http://grails.org/BackgroundThread+Plugin Tuesday, November 18, 2008 16
    • BackgroundThread Usage Example class FooService { boolean transactional = false def backgroundService def serviceMethod() { (1..<10).each { cnt -> backgroundService.execute(quot;Logging '$cnt'”, { log.info(quot;${cnt}quot;) }) } } Tuesday, November 18, 2008 17
    • But What About JRuby on Rails? Tuesday, November 18, 2008 18
    • My JRuby on Rails Street Cred • Work history in Rails, including last 5 months on a JRuby on Rails project • Regular attendee, competition member, and one-time presenter at Ruby Users of Minnesota (RUM) • Charlie “Headius” Nutter fan Tuesday, November 18, 2008 19
    • Why Not JRuby on Rails? • Although Java-in-Ruby is fairly slick, Ruby-in-Java is pretty rough and best mediated via Groovy metaprogramming • GORM is superior to ActiveRecord • http://www.oreillynet.com/ruby/blog/2007/05/ bind_parameters_now.html • GSPs are superior to ActionView • Spring is superior to nothing • Optional static typing is superior to pure dynamic typing • You can code Grails without grokking its source • Nobody is fired for choosing Java Tuesday, November 18, 2008 20
    • The One Circumstance I Would Still Use Rails • Small CRUD-based app with its own DB • No or very generous performance limits • Owned by one or two developers • Expected life cycle of less than a year • Deployed system is without Java or is an Apache web server with mod_passenger and without mod_proxy or mod_jk Tuesday, November 18, 2008 21
    • Your Grails Adoption Plan • Best approach: start with a roughly green- field proof-of-concept web application • Use GRAG on SourceForge to generate a database front-end to impress your boss • Wrap an existing Java web application in Grails and use web.xml (installed via “grails install-templates”) to map urls to servlets Tuesday, November 18, 2008 22
    • Resources • Home Pages: http://grails.org http://groovy.codehaus.org/ • Live Open Source Applications Grails Crowd Grails.org Groovy Blogs • Media Groovy & Grails Podcast GroovyMag Tuesday, November 18, 2008 23
    • Groovy Mag Tuesday, November 18, 2008 24
    • Sold? Want to know more? • Robert is offering “Introduction to Groovy, Grails, and AJAX” training in the Triangle on December 15th through 18th. Additional training courses will be offered next year. • Subscribe to “Smokejumper Training” Google Group for more information. • On-demand training, technical leadership, and mentoring services are also available. http://SmokejumperIT.com Tuesday, November 18, 2008 25