Presentation on Griffon by Jim Shingler

Introduction to Creating a Griffon: Rich Client front-end to our Twitter Clone By Jim Shingler © Jim Shingler Wednesday, May 13, 2009 1

Abstract Groovy and Grails have given us the ability to leverage the strength of the Java Platform (and Eco System) and the productivity of “Convention over Conﬁguration” to construct websites. But “What If” the User Interface requirements of the new application is best solved with the type of interaction a desktop application provides? Griffon bring the same productivity gains to the desktop application that Grails brings to web applications. This session will use Griffon and popular open source libraries to build a desktop application to interact with a Grails backend. © Jim Shingler Wednesday, May 13, 2009 2

Introduction My name is Jim Shingler Chief Technical Architect President of Genuine Solutions Beginning Groovy and Grails Co-Author FallME (Inversion of Control for JavaME) Co-Founder Griffon Splash Plugin Author Griffon gConﬁg Author Griffon TM Bundle Author © Jim Shingler Wednesday, May 13, 2009 3

Agenda Griffon 101 •What is Griffon •Installing Griffon •0 -100 k/mph in 60 seconds </xml> •Plugins Overview •Teaching the Griffon to count (Binding and Threading) •Readying Graeme’s Twitter Clone Griffon 201 •Griffon Twitter Client © Jim Shingler Wednesday, May 13, 2009 4

Installing Griffon 1. Download Griffon 2. Unpack it (unix: /opt/local/share/ windows: /apps/griffon) 3. Set the GROOVY_HOME 4. Add it to your path, <GROOVY_HOME>/bin © Jim Shingler Wednesday, May 13, 2009 5

0-100 k/mph in 60 Seconds > griffon create-app small Welcome to Griffon 0.1.0 - http://griffon.codehaus.org/ Licensed under Apache Standard License 2.0 Griffon home is set to: /opt/local/share/griffon-0.1.0 ... > griffon run-app © Jim Shingler Wednesday, May 13, 2009 6

DEMO © Jim Shingler Wednesday, May 13, 2009 7

Congratulations you are a Developer © Jim Shingler Wednesday, May 13, 2009 8

Don’t forget to update your resume. Griffon © Jim Shingler Wednesday, May 13, 2009 9

App Structure & Convention A pretty standard application structure, . . . you can pretty well guess the purpose of the ﬁles and directories. © Jim Shingler Wednesday, May 13, 2009 10

Griffon Commands © Jim Shingler Wednesday, May 13, 2009 11

Plugins © Jim Shingler Wednesday, May 13, 2009 12

Start Small • Swing and SwingX Builder • GUI Components • About Box • Deﬁne and Process Actions © Jim Shingler Wednesday, May 13, 2009 13

DEMO • Create Count App • Add Button • Build and Initialize “Click Action” • Process the Click Action • Install and Enable SwingXBuilder • Build and Initialize Menus • Build and Initialize “Menu Actions” • Process the Menu Actions © Jim Shingler Wednesday, May 13, 2009 14

Controller import javax.swing.JOptionPane class CountingController { // these will be injected by Griffon def model def view def builder void mvcGroupInit(Map args) { // this method is called after model and view are injected } def click = { evt = null -> model.count++ } def exit = { evt = null -> app.shutdown() } def showAbout = { evt = null -> builder.optionPane().showMessageDialog(null, 'This is the Counting Application') } } © Jim Shingler Wednesday, May 13, 2009 15

Model import groovy.beans.Bindable Adds Property @Bindable Change Support class CountingModel { def count = 0 } to the model © Jim Shingler Wednesday, May 13, 2009 16

View and Menu View application(title:'sample2', /*size:[320,480], */location:[200,200], pack:true, locationByPlatform:false) { // add content here build(Actions) Loads and runs Actions and MenuBar scripts inline build(MenuBar) button(id:'clickButton', text:bind{ model.count }, action: clickAction) } Data Binding. Observe the change in the model MenuBar Execute the “clickAction” jxmenuBar { menu(text: 'File', mnemonic: 'F') { menuItem(exitAction) Use the action to deﬁne } the menu item glue() menu(text: 'Help', mnemonic: 'H') { menuItem(aboutAction) } } © Jim Shingler Wednesday, May 13, 2009 17

Actions // create the actions Closure to run when action(id: 'clickAction', the action is name: 'Click Me', executed closure: controller.&click, shortDescription: 'Increment the Click Count' ) action(id: 'exitAction', name: 'Exit', closure: controller.exit, mnemonic: 'x', accelerator: 'F4', shortDescription: 'Exit SimpleUI' ) action(id: 'aboutAction', name: 'About', closure: controller.showAbout, mnemonic: 'A', accelerator: 'F1', shortDescription: 'Find out about SimpleUI' ) © Jim Shingler Wednesday, May 13, 2009 18

Threading the GUI It isn’t that bad © Jim Shingler Wednesday, May 13, 2009 19

Rules of Thumb • Painting and UI Operations need to be done in the EventDispatchThread (EDT) • Everything else should be done outside the EDT • Java 6 has SwingWorker, Java 5 has SwingLabs Swingworker But that just isn’t Groovy enough for Griffon © Jim Shingler Wednesday, May 13, 2009 20

Griffon Threading • Build the UI in the EDT SwingBuilder.build { . . . } • Long Running code outside the EDT doOutside { . . . } Creates thread and runs closure • code inside the EDT edt { . . . } Do synchronously in EDT doLater { . . . } Do asynchronously in EDT © Jim Shingler Wednesday, May 13, 2009 21

DEMO © Jim Shingler Wednesday, May 13, 2009 22

Model import groovy.beans.Bindable @Bindable class CountingModel { def count = 0 def countSlow = 0 def countConcurrent = 0 } © Jim Shingler Wednesday, May 13, 2009 23

View application(title:'counting', /*size:[320,480], location:[50,50],*/ pack:true, locationByPlatform:true) { build(Actions) build(MenuBar) gridLayout() button(id:'clickButton', text:bind {model.count}, action: clickAction) label(text:bind {model.count}) button(id:'slowClickButton', text:"Slow Click", action: slowClickAction) label(text:bind {model.countSlow}) button(id:'concurrentClickButton', text:"Concurrent Click", action: concurrentClickAction) label(text:bind {model.countConcurrent}) } © Jim Shingler Wednesday, May 13, 2009 24

Actions // create the actions action(id: 'clickAction', name: 'Click', closure: controller.&click, shortDescription: 'Increment the Click Count' ) action(id: 'clickActionSlow', name: 'Click Slow', closure: controller.&clickSlow, shortDescription: 'Increment the Click Count Slow' ) action(id: 'clickActionConcurrent', name: 'Click Concurrent', closure: controller.&clickConcurrent, shortDescription: 'Increment the Click Count Concurrent' ) action(id: 'exitAction', name: 'Exit', closure: controller.exit, mnemonic: 'x', accelerator: 'F4', shortDescription: 'Exit SimpleUI' ) action(id: 'aboutAction', name: 'About', closure: controller.showAbout, mnemonic: 'A', accelerator: 'F1', shortDescription: 'Find out about SimpleUI' ) © Jim Shingler Wednesday, May 13, 2009 25

Controller import javax.swing.JOptionPane class CountingController { // these will be injected by Griffon def model def view void mvcGroupInit(Map args) { } def click = { evt -> model.count++ } def clickSlow = { evt = null -> Thread.sleep(5000) model.countSlow++ } def clickConcurrent = { evt = null -> doOutside { Thread.sleep(5000) edt { // Sync model.countConcurrent++ } } } def exit = { evt = null -> System.exit(0) } def showAbout = { evt = null -> JOptionPane.showMessageDialog(null, '''This is the SimpleUI Application''') } } © Jim Shingler Wednesday, May 13, 2009 26

Twitter Clone Enhancements © Jim Shingler Wednesday, May 13, 2009 27

Render Status XML import grails.converters.* class StatusController { def twitterCache def index = { def messages = twitterCache.get(principalInfo.username)?.value if(!messages) { messages = findStatusMessages() twitterCache.put new Element(principalInfo.username, messages) } def feedOutput = { . . . } withFormat { html([messages:messages]) xml { render messages as XML} rss { render(feedType:"rss", feedOutput)} } } . . . © Jim Shingler Wednesday, May 13, 2009 28

Render Person XML import grails.converters.* class PersonController { ... def ﬁndByUsername = { def p = Person.ﬁndByUsername(params.username) withFormat { html person:p xml { render p as XML } } } ... © Jim Shingler Wednesday, May 13, 2009 29

def show = { def person = Person.get(params.id) if (!person) { ﬂash.message = "Person not found with id $params.id" redirect action: list return } List roleNames = [] for (role in person.authorities) { roleNames << role.authority } roleNames.sort { n1, n2 -> n1 <=> n2 } withFormat { html ( [person: person, roleNames: roleNames] ) xml { render person as XML } } // [person: person, roleNames: roleNames] } © Jim Shingler Wednesday, May 13, 2009 30

Acegi Basic Authentication grails-app/conf/SecurityConﬁg.groovy security { // see DefaultSecurityConfig.groovy for all settable/overridable properties active = true basicProcessingFilter = true loginUserDomainClass = "Person" authorityDomainClass = "Authority" requestMapClass = "Requestmap" } © Jim Shingler Wednesday, May 13, 2009 31

Acegi Basic Authentication grails-app/conf/spring/resources.groovy beans = { authenticationEntryPoint(org.springframework.security.ui.basicauth. BasicProcessingFilterEntryPoint) { realmName = 'Grails Realm' } twitterCache(org.springframework.cache.ehcache.EhCacheFactoryBean) { timeToLive = 1200 } } © Jim Shingler Wednesday, May 13, 2009 32

Requirements • Login • Display User Info • Display Statuses (Tweets) • Update Statuses(Tweets) • Send My Own Status (Tweet) © Jim Shingler Wednesday, May 13, 2009 34

Overview MVC Triad MenuBar Controller View ToolBar StatusBar Model Tips About Twitter Service </xml> Twitter Clone © Jim Shingler Wednesday, May 13, 2009 35

Founders Danno Ferrin http://shemnon.com/speling Andres Almiray http://jroller.com/aalmiray James Williams http://jameswilliams.be/blog © Jim Shingler Wednesday, May 13, 2009 47

Resources • Griffon • griffon.codehause.org • griffon-user@groovy.codehause.org • Grails • www.grails.org Coming • Books Soon © Jim Shingler Wednesday, May 13, 2009 48

Resources • dev@griffon.codehaus.org is a medium volume list useful for those interested in ongoing developments • scm@griffon.codehaus.org is a high volume list that logs commits and issues • user@griffon.codehaus.org is a high volume list is for questions and general discussion about Griffon • You can ﬁnd a great archive support at MarkMail, http://griffon.markmail.org. © Jim Shingler Wednesday, May 13, 2009 49

Conclusion Thank You for your time • Blog: http://jshingler.blogspot.com • Email: ShinglerJim@gmail.com • LinkedIn: http://www.linkedin.com/in/jimshingler • Twitter: @jshingler © Jim Shingler Wednesday, May 13, 2009 50

Presentation on Griffon by Jim Shingler

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