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Google App Engine for Java

Google App Engine for Java. Lars Vogel Ralf Gueldemeister Venkiteswaran Balakrishnan. Google App Engine. Commonly referred to as “Platform as a Service”, the GAE allows you to host webapplications in the Google infrastructure. Scalable Infrastructure.

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Google App Engine for Java

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  1. Google App Engine for Java • Lars Vogel Ralf Gueldemeister Venkiteswaran Balakrishnan

  2. Google App Engine Commonly referred to as “Platform as a Service”, the GAE allows you to host webapplications in the Google infrastructure. Scalable Infrastructure

  3. You cannot see behind the curtain, GAE provides a fixed set of API to you. Scalable Infrastructure

  4. Google App Engine Scalable Infrastructure

  5. Google App Engine - Limits 10 Applications per User 5 Million Pageviews are free per month. Approx. 6.5 hours of CPU and 1 Gigabyte of traffic. http://code.google.com/intl/en-EN/appengine/docs/billing.html Scalable Infrastructure

  6. Google App Engine – Programming Languages Python Java-isch Scala Groovy JRuby JPython …

  7. Webprogramming with JavaServlet vrs. JSP A servlet is a Java class which answers a HTTP request within a web container. JavaServer Pages (JSP) are files which contains HTML and Java code. The web container compiles the JSP into a servlet at the first time of accessing this JSP

  8. Google App Engine – Java Restricts usage of some Java classes, e.g. Threads Allows to use standard Java EE API Provides Low-Level Google API

  9. Data Store Based on BigTable Sorted Map, no Joins Schemaless Transactional Low-level APIs JDO and JPA Blobstore

  10. Datastore via JDO Data Classes @PersistenceCapablepublic class Employee {    @Persistent    private String name} PersistenceManager PersistenceManager pm = PMF.get().getPersistenceManager();pm.makePersistent(employee);pm.close; Retrieval and Queries employee = pm.getObjectById(Employee.class, key);Query query = pm.newQuery(Employee.class, “name = :name”);List<Employee> results = (List<Employee>) query.execute("Smith"); Relations @Persistent(mappedBy = "employee“)private List<ContactInfo> contactInfoSets;

  11. App Engine Services Caching URL Fetching Mail Instant Messaging Image Manipulation User Management Background Tasks

  12. Possible Web Frameworks on GAE/J Basically all Java Web frameworks, e.g. JSP, Servlets based GWT, JSF, Struts, Wicket

  13. Demo

  14. Hands-on Tutorial The following tutorials give an intro to GAE/J using servlets and JSP‘s http://www.vogella.de/articles/GoogleAppEngineJava/article.html http://code.google.com/intl/de-DE/appengine/docs/java/gettingstarted/ Datastore: http://code.google.com/appengine/docs/java/datastore/ http://code.google.com/appengine/articles/datastore/overview.html http://www.readwriteweb.com/enterprise/2009/02/is-the-relational-database-doomed.php http://www.slideshare.net/LucaMarrocco/google-app-engine-java

  15. Photo credits • Guy pulling the white wall http://www.sxc.hu/photo/702367 • Balloon http://www.sxc.hu/photo/566242 • Open Door http://www.sxc.hu/photo/1228296 • Paper Chart http://www.sxc.hu/photo/565681 • Binary http://www.sxc.hu/photo/1072645 • Footprint http://www.sxc.hu/photo/442696 • Old Computer http://www.sxc.hu/photo/1028528 • Carton http://www.sxc.hu/photo/502161 • Eye http://www.sxc.hu/photo/933394 • Guitar playing man http://www.sxc.hu/photo/ 894247

  16. Thank you For further questions: Lars.Vogel@gmail.com http://www.vogella.de http://www.twitter.com/vogella

  17. License & Acknowledgements • This work is licensed under the Creative Commons Attribution-Noncommercial-No Derivative Works 3.0 Germany License • See http://creativecommons.org/licenses/by-nc-nd/3.0/de/deed.en_US

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