Java Support On Google App Engine
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Google App Engine is a platform that allows developers to build and host Java web applications on Google's infrastructure. It handles tasks like scaling and maintenance automatically. Developers can focus on coding without worrying about managing hardware, servers, or other infrastructure. The platform provides APIs that allow access to Google services like Datastore, Memcache, and others. It also includes tools for deploying, monitoring, and managing applications.
Java Support On Google App Engine
- 1. Java Applications on Google App Engine Narinder Kumar www.xebiaindia.com
- 2. Easy to build, easy to maintain, easy to scale
- 3. Current Web Application LifeCycle Management ➢ Prepare ➢ Deploy ➢ Scale ➢ Maintain / Monitor ➢ Upgrade Difficult and Expensive
- 4. Google App Engine ?
- 5. What is Google App Engine ➢ Yet another Cloud Computing Platform ➢ Hosts your Web Applications on Google Infrastructure ➢ Formally launched in April'08 with Python ➢ Java Support enabled in April'09
- 6. Java on Google App Engine ➢ Platform as a Service (PaaS) ➢ Hardware, Connectivity ➢ Operating System ➢ JVM ➢ Servlet Container ➢ SDK ➢ API's for accessing Google Infrastructure Services
- 7. Key Features ➢ No need to install or maintain your own stack ➢ Scaling on Demand ➢ Google's proven infrastructure for you ➢ Pay as you Go, Free to get started
- 8. Architecture
- 9. Typical Application Building Blocks Industry Standard APIs : JPA/JDO, JCache,JavaMail Google Specific API Interfaces Google Infrastructure
- 10. Platform ➢ JVM 5 or later ➢ Servlet 2.5 Container, Jetty & Jasper (can change) ➢ HTTP Session ➢ JSP ➢ SandBox Environment ➢ Google Services API
- 11. Getting Started ➢ Google Account & Mobile Phone ➢ Download and install SDK ➢ Plugin for your IDE / Command Line
- 13. Summary ➢ SDK includes ➢ Dev AppServer ➢ Disk based version of DataStore ➢ Simulation of Google User Service ➢ Deployment ➢ https://appengine.google.com ➢ Application hosted at <app-id>.appspot.com or Custom Domain
- 14. Configuration ➢ appengine-web.xml ➢ Application Name and Version ➢ Logger ➢ Static Files ➢ Resource Files ➢ System Properties & Environment Variables ➢ SSL ➢ Session ➢ Inbound Services
- 15. Data Manipulation ➢ Underlying Storage is BigTable ➢ JDO or JPA or DataStore API ➢ JDO & JPA implemention by DataNucleus Access Platform ➢ jdoconfig.xml or persistence.xml ➢ datastore-indexes.xml Let's try with a simple scenario
- 16. Data Manipulation Constraints ➢ Max 1000 rows per request ➢ Not Allowed while Using JPA ➢ Owned Many-to-many relations ➢ Join, group by, having... ➢ Only JOINED and MAPPED_SUPERCLASS during Inheritance ➢ Restrictions on Queries
- 17. RDBMS vs DataStore RDBMS DATASTORE JPA JDO DataBase DataStore @Entity @PersistanceCapa Table Kind ble Row Entity @Id @PrimaryKey Row ID Key @GeneratedVal @Persistent Column Property ue find(...) getObjectById(...)
- 18. Other Google Services ➢ URL Fetch ➢ Memcache ➢ User Service ➢ Mail ➢ Image ➢ XMPP
- 19. Additional Services ➢ Cron ➢ AOP Like Interface ➢ Task Queues
- 20. Managing & Monitoring ➢ Dashboard ➢ Reporting ➢ Manage different versions ➢ Logs
- 21. Developer's Toolkit ➢ IDE Plugins ➢ Ant supported, Maven on the way ➢ Testing Facilities ➢ XML Validation
- 22. Quotas & Billing ➢ Billable Quotas & Fixed Quotas ➢ Per-minute Quotas ➢ Resources ➢ Requests ➢ CPU ➢ Bandwidth (In/Out) ➢ Google Services
- 23. Current Pricing ➢ Very Generous ➢ CPU : 6.5 hours / day, $0.10 / hour later ➢ Bandwidth In/Out : 1 GB / day, $0.10/$0.12 GB later ➢ Stored Data : 1 GB ➢ Emails : 2000/day
- 24. How to Manage / Monitor Costs ➢ QuotaService ➢ Profiling Tool ➢ Application behaviour when Resources are finished ➢ AdminConsole
- 25. Constraints ➢ Restricted JVM ➢ Threads ➢ File System Writes ➢ ClassLoader, JNI,... ➢ Read Only File System ➢ DataStore : Only choice for persistence ➢ Requests limited to max 30 seconds
- 26. Limitations ➢ No Server Push ➢ Request & Response Size Max 10 MB ➢ Max Files < 3000 ➢ Max Size of Application Files < 150 MB
- 27. Supported Languages & Frameworks ➢ Groovy & Grails ➢ JRuby on Rails (with some build and config modifications) ➢ Scala & Lift (no Scala Actors) ➢ Wicket ➢ Blaze-DS ➢ Struts,...
- 28. Powered By Google App Engine
- 29. Competitors ➢ SaaS / PaaS / IaaS ➢ Azure Sevices ➢ Force.com ➢ Amazon Web Service
- 31. References & Credits ➢ Of-course Google (http://code.google.com/appengine/) ➢ Google IO 2009 Sessions ➢ Dzone RefCardz