Rapid Application Development on Google App Engine for Java
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The document discusses rapid application development using Google App Engine (GAE) for Java, highlighting its benefits, architecture, and pricing. It also addresses common challenges faced by Java web developers and introduces Glide, a tool that simplifies the development process with minimal configurations. The presentation aims to provide attendees with insights on deploying applications quickly and efficiently on the cloud.
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layout {
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![Security
• Authentication
– Use ubiquitous Google id
– Or open Id (experimental)
– Can Allow only administrator
web {
security = [
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Rapid Application Development on Google App Engine for Java
- 1. Rapid Application Development on Google App Engine for Java Kunal Dabir @kdabir github.com/kdabir
- 2. Agenda • Introduction • Rapid Apps – when? • Options • Developing on GAE/J – Pricing – Architecture – What’s wrong – Simpler way • Demo – Build and deploy a simple site. • Better Practices • Q & A 2
- 3. About the Talk • Level: Basic / Introductory • Warning: There will be <code> – Some Programming knowledge of Java/Html • Based on my own experiences: – Working in different web technologies and – Cloud hosting solutions • Takeaways : – Get your app on cloud in a snap – Learn a thing or two about GAE/J 3
- 4. About Me • Programming for more than a decade • Currently working at ThoughtWorks • Language Enthusiast: – Java, Groovy, Ruby, JavaScript (Node), CoffeeScript, Scala,….. • Groovy Evangelist • Co-Organizer / Speaker: Pune Java User Group • More at: kunaldabir.appspot.com 4Facts as on Sept 2013
- 5. Quick Poll - Who all: • Do Java web apps? • Have used Google App Engine? • Have heard of Groovy Language? • Understand NoSQL data store? • Deployed an app ? – (cloud/shared hosting /VPS/ anywhere) • Enjoy programming? 5
- 6. Rapid App Development - When ? • Prototyping • Personal Pet Project • Utility Apps • REST API 6
- 7. Rapid App Development - When ? • Not more than a few pages • Data Records in thousands • When time to market is critical • When resources are limited 7
- 8. Options • Google App Engine – google • Heroku - salesforce • CloudFoundry - vmware/spring • OpenShift - Redhat/jboss • dotCloud, EngineYard, Joyent, Cloudbees .... 8
- 9. Google App Engine - Benefits • Quick to get development started • Easy Provisioning • No Operations • Horizontal (Auto) Scaling • Language Support : Python, Java, Go and PHP 9
- 10. GAE Has it all • DataStore • Memcache • Blobstore • Users API • Channel API • Backends • Images API • Logging • Mail API • Capabilities API • Multitenancy • Task Queue • Cron Jobs • URLFetch • XMPP • Static File Server 10
- 11. At High Level 11 DataStore HRD • One for app • Multi tennancy • Shared between version App Servers • App Code • Auto Scaled • Multi Versioned Static Web Server • CSS/JS/HTML • Fast Response • Always On
- 12. Pricing • Free to start • Enable Paid app, get resident instance. • A lot cheaper than competition • 28 free instance hours $0.08 / hour • https://cloud.google.com/pricing/ 12
- 13. The Java Way - What’s Wrong? As a java web developer: • Puzzled with OO soup, getters setters, syntactic noises • Framework hell, Mix and match. • XML noise or interspersed annotations@@@@ • Deployment ?? where ?? nothing free 13
- 14. The Java Way - What’s Wrong? • Complex Builds – And the Builds files (verbose, xml) • Nested directory structure of java web apps • Using the SDK directly – Or the eclipse plugin (can’t build outside IDE) • Ceremony and Boilerplate 14
- 15. The Java Way - What’s Wrong? import java.io.*; import javax.servlet.*; import javax.servlet.http.*; public class HelloWorld extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException{ response.setContentType("text/html"); PrintWriter out = response.getWriter(); out.println("Hello World"); } } 15
- 16. Enter Glide • Easy Install • No configuration, well almost • No complicated directory structure • Hot reload • No Lock-in, export to gradle project 16
- 17. Built on Awesome technoloG’s • Google App Engine • Groovy • Gaelyk • Gradle • Git • GitHub 17
- 18. Gaelyk Recap - Persistence import com.google.appengine.api.users.User import groovyx.gaelyk.datastore.* @Entity class Post { String title String content @Indexed Date date = new Date() User user } 18
- 19. Gaelyk Recap - Controller new Post( title: params.title, content: params.content, user: users.currentUser ).save() log.info "Post Saved" redirect "/" 19
- 20. Gaelyk Recap - Routing get "/", forward: "/home.gtpl" , cache: 10.minutes get "/docs/@doc", forward: "/_doc.groovy?docname=@doc" get "/docs/", redirect: "/docs/intro" post "/create", forward: "/_create.groovy" all "/install", forward: "/install.html" 20
- 21. Using Glide You need to know only three commands : $ glide run $ glide deploy $ glide export 21
- 22. Configuration Files • Only three config files, All optional __glide.groovy Discussed in next section __routes.grovy The gaelyk routes file we just saw __build.gradle Used to customize build. Not discussed here. 22
- 23. Configure Glide App • Required to deploy app. • Use the registered app-id app { name = "app-id" version = "v1" } 23
- 24. Layout Template Sitemesh enabled by default layout { mappings = [ "/*": "/_layout.html" ] } 24
- 25. Security • Authentication – Use ubiquitous Google id – Or open Id (experimental) – Can Allow only administrator web { security = [ 'admin': ["/post/*"], '*': ["/view/*"] ] } 25
- 26. Demo 26
- 27. Getting more mileage • Use CDN • Hotlink JS Libraries, CSS and Images • Use static landing page • Use memcache • Cache pages • Enable PageSpeed • Multiple versions 27
- 28. Trade Offs • Performance • Slower cold start • Learning curve • Difference b/w Local and Live GAE server 28
- 29. Question Answers • Questions are guaranteed in Life, Answers aren’t 29
- 30. Resources • Glide : – http://glide-gae.appspot.com • Gaelyk : – http://gaelyk.appspot.com • Group: – http://groups.google.com/forum/#!forum/glide-groovy • Github: – https://github.com/kdabir/glide 30