CloudConf2011 Introduction to Google App Engine
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The document provides an introduction and agenda for a presentation on Google App Engine. It discusses the speaker's background in Java development. The agenda covers Google App Engine, persistence in GAE using JDO and JPA, limits of GAE/J, quotas and performance, build tools, and hands-on examples. It summarizes the features and restrictions of GAE/J, how to set up projects in Eclipse, deploy to the cloud, and view apps online.
![Test in the local sandbox
► You can test your application in the local sandbox
► http://localhost:8888/[your_project_name]
21.11.11 29 CloudConf 2011 - GAE/J](https://image.slidesharecdn.com/cloudconf2011-gae-introduction-1-111128053616-phpapp01/85/CloudConf2011-Introduction-to-Google-App-Engine-29-320.jpg)
![Calling now on the cloud
► Call your Application now on the cloud!
► [appid].appspot.com/[servletname] (Servletname = Projectname by
default)
► The servlet should greet you…
► Check your Application-Dashboard
– https://appengine.google.com/
21.11.11 32 CloudConf 2011 - GAE/J](https://image.slidesharecdn.com/cloudconf2011-gae-introduction-1-111128053616-phpapp01/85/CloudConf2011-Introduction-to-Google-App-Engine-32-320.jpg)
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CloudConf2011 Introduction to Google App Engine
- 1. Introduction into Google App Engine Halil-Cem Gürsoy adesso AG Tw @hgutwit G+ http://goo.gl/hljRS 21.11.11
- 2. The speaker ► More then 12 years development in Java ► Before getting a “consulting developer“ some years research (calculation of RNA folding with genetic algorithms using Pascal) ► Senior Software Engineer at adesso AG, Dortmund ► Speaker on some conferences: (W)-JAX, DOAG, HerbstCampus etc. ► Mostly EAI/SOA projects... with plain good old Java / JEE ► … and a bit Scala 21.11.11 2 CloudConf 2011 - GAE/J
- 3. Agenda ► Google App Engine ► Persistence in Google App Engine ► Limits in GAE/J ► Quota and Performance ► Build-Tools ► Hands-On 21.11.11 3 CloudConf 2011 - GAE/J
- 4. Agenda ► Google App Engine ► Persistence in Google App Engine ► Limits in GAE/J ► Quota and Performance ► Build-Tools ► Hands-On 21.11.11 4 CloudConf 2011 - GAE/J
- 5. The Google App Engine ► A classic PaaS ► No control over the OS ► A runtime for Web Application ► At the start, only Python was supported ► Since 2009 Java, now Google Go > Java-Support is limited! 21.11.11 5 CloudConf 2011 - GAE/J
- 6. Talking about GAE/J ► GAE/J = JRE6 > A Sandbox with restrictions ► Supports out of the box > Servlet API 2.4 (*) > JSF 1.1, 2.0 (*) > JSP (*) > JDO 2.3 (?!) > JPA 1(*) ► Support for Google Services und API‘s 21.11.11 6 CloudConf 2011 - GAE/J
- 7. Agenda ► Google App Engine ► Persistence in Google App Engine ► Limits in GAE/J ► Quota and Performance ► Build-Tools ► Hands-On 21.11.11 7 CloudConf 2011 - GAE/J
- 8. Persistence in GEA ► Default Store is a Key-Value NoSQL-DB (Google BigTable) ► JDO and JPA supported… partially > ORM via DataNucleus v1.1 ► JDO is still better documented than JPA in the GAE/J documentation ► You can use the low level API for Google BigTable ► You can use in-memory Databases ► Enhancement of Entity Classes needed (good to know for Build) ► MySQL-Support is upcoming (now in Beta, chosen accounts) 21.11.11 8 CloudConf 2011 - GAE/J
- 9. GAE - JPA ► Transactional behavior is configured in the persistence.xml <persistence-unit name="transactions-optional"> <provider>org.datanucleus.store.appegine.jpa.DatastorePersistenceProvider </provider> <properties> <property name="datanucleus.NontransactionalRead” value="true" /> <property name="datanucleus.NontransactionalWrite” value="true" /> <property name="datanucleus.ConnectionURL” value="appengine" /> </properties> </persistence-unit> 21.11.11 9 CloudConf 2011 - GAE/J
- 10. More on JPA ► @ManyToMany is not supported ► Join-Queries are not supported ► You can not use > InheritanceType.SINGLE_TABLE > InheritanceType.JOINED ► No support for aggregation queries > group by, having, sum, avg, min, max ► No support for polymorphic queries 21.11.11 10 CloudConf 2011 - GAE/J
- 11. More to know about limits in JPA ► Resultsets are not initialized, you have to do it! > resultSet.size(); ► Id Fields: don’t use long type > Unsupported primary key type: long ► GenerationType.TABLE results in an error > javax.persistence.PersistenceEception: Transaction is still active. ► Solution @Id GeneratedValue(strategy = GenerationType.IDENTITY) private com.google.appengine.api.datastore.Key key; 21.11.11 11 CloudConf 2011 - GAE/J
- 12. Agenda ► Google App Engine ► Persistence in Google App Engine ► Limits in GAE/J ► Quota and Performance ► Build-Tools ► Hands-On 21.11.11 12 CloudConf 2011 - GAE/J
- 13. Other Limits in GAE ► The “JRE Whitelist” defines all supported JRE classes > http://code.google.com/intl/de-DE/appengine/docs/java/jrewhitelist.html > Only ~ 1500 classes ► Your application should not > …start own threads (due to that, no Akka-Support if you use Scala) > …write files > …open network sockets 21.11.11 13 CloudConf 2011 - GAE/J
- 14. Will it play? ► Overview about the support for frameworks and JVM languages: > http://code.google.com/p/googleappengine/wiki/WillItPlayInJava ► No support for… > JAX-RPC > JDBC > JMS (!) > JNDI > …and much more! ► A little bit support for JAX-WS, good support for REST ► Scala, Groovy (look @ Gealky) etc. supported ► Spring Core is supported 21.11.11 14 CloudConf 2011 - GAE/J
- 15. Spring support ► Not all Spring Projects are supported - core is ► Running: Spring MVC with Spring beans ► Setup: JAR files into /WAR/WEB-INF/lib and add to Classpath ► Example: <listener> <listener-class> org.springframework.web.context.ContextLoaderListener </listener-class> </listener> <servlet> <servlet-name>dispatcher</servlet-name> <servlet-class> org.springframework.web.servlet.DispatcherServlet</servlet-class> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>dispatcher</servlet-name> <url-pattern>/springgae/*</url-pattern> </servlet-mapping> 21.11.11 15 CloudConf 2011 - GAE/J
- 16. Why? 21.11.11 16 CloudConf 2011 - GAE/J
- 17. GAE and Android ► Tight integration of GAE and Android via Android Cloud to Device Framework (C2DM) > http://code.google.com/android/c2dm/ ► C2DM enables Android Apps to use all GAE as the backend ► ...e.g. use the GAE Data Store ► ...e.g. send Mails from GAE ► Example: Chrome to Phone-Extension and App > http://code.google.com/p/chrometophone/ 21.11.11 17 CloudConf 2011 - GAE/J
- 18. More Reasons… ► No one enforces you to use JPA or JDO on GAE! > Use the native Interface > You have a free, full distributed, NoSQL Key-Value DB! ► Transparent scaling of your app > You have not to care about how many instances you have to start and then to start > GAE is not Beanstalk / CloudFoundry > In Beanstalk / CloudFoundry you have still to take care about LB and your infrastructure 21.11.11 18 CloudConf 2011 - GAE/J
- 19. Agenda ► Google App Engine ► Persistence in Google App Engine ► Limits in GAE/J ► Quota and Performance ► Build-Tools ► Hands-On 21.11.11 19 CloudConf 2011 - GAE/J
- 20. Quota ► GAE with limits w/o fee ► New Billing System to overcome limits ► Quota exceeded: HTTP 403 Errors or Exceptions (bad if you not aware of quota) ► Per minute quota = aprox. 500 Req./min. 21.11.11 20 CloudConf 2011 - GAE/J
- 21. Measured Performance 21.11.11 21 CloudConf 2011 - GAE/J
- 22. Agenda ► Google App Engine ► Persistence in Google App Engine ► Limits in GAE/J ► Quota and Performance ► Build-Tools ► Hands-On 21.11.11 22 CloudConf 2011 - GAE/J
- 23. Build-Tools ► Ant is supported > Enhancement of entity classes > Deployment ► Maven > Maven2 plug-in available (http://code.google.com/p/maven-gae-plugin/ ) > Archetypes for JSP, GWT and Wicket-Projects > GAE SDK not available via Maven repositories anymore (?) 21.11.11 23 CloudConf 2011 - GAE/J
- 24. Agenda ► Google App Engine ► Persistence in Google App Engine ► Limits in GAE/J ► Quota and Performance ► Build-Tools ► Hands-On 21.11.11 24 CloudConf 2011 - GAE/J
- 25. Hands on? ► Some slides to tell you that is needed ► Ask me afterwards for a live demo ► Get ready... 21.11.11 25 CloudConf 2011 - GAE/J
- 26. Getting started ► Google App Engine Account activated? > You need your mobile number for activation ► Eclipse with the Google Plug-in ► Manual installation via Eclipse Market Place > http://marketplace.eclipse.org/content/google-plugin-eclipse ► SDK with CLI and more resources at GAE-Homepage – http://code.google.com/appengine/ 21.11.11 26 CloudConf 2011 - GAE/J
- 27. Create new project 21.11.11 27 CloudConf 2011 - GAE/J
- 28. Hello World 21.11.11 28 CloudConf 2011 - GAE/J
- 29. Test in the local sandbox ► You can test your application in the local sandbox ► http://localhost:8888/[your_project_name] 21.11.11 29 CloudConf 2011 - GAE/J
- 30. Create your cloud app ► Register your application in your GAE account ► https://appengine.google.com/ -> “Create Application” ► Choose an Application Identifier and an Application Name (note them!) ► Choose the Authentication Option > Default is “Open to all Google Account users” > User can sign in into your app using their Google Account ► Choose Storage Option > High Replication (default) vs. Master/Slave > High Replication is “eventualy consistent” (latency in writes) 21.11.11 30 CloudConf 2011 - GAE/J
- 31. Deployment ► Choose „Google – Deploy to App Engine“ from context menu ► Provide your App Engine data 21.11.11 31 CloudConf 2011 - GAE/J
- 32. Calling now on the cloud ► Call your Application now on the cloud! ► [appid].appspot.com/[servletname] (Servletname = Projectname by default) ► The servlet should greet you… ► Check your Application-Dashboard – https://appengine.google.com/ 21.11.11 32 CloudConf 2011 - GAE/J
- 33. Thank you for your attention! [email protected] www.adesso.de