Google App Engine
- 1. GOOGLE APP ENGINE FOR THE ENTERPRISE Kayode Odeyemi Cloud Camp 2011 May 28th, 2011
- 2. The Cloud 1. Convenience Pay for what you use 2. On-Demand network access Use as much as you need, whenever you need 3. Minimal management effort Don’t have to build your own infrastructure
- 3. Cloud Computing – As seen by Gartner
- 4. WHAT IS GOOGLE APP ENGINE? • Google’s own infrastructure for running web applications • The P (Platform) of Cloud Computing. • App Engine is HTTP Server, but does not serve HTML • Host web services for integration • Consume other web services • Various authentication options: Oauth, Google Account So, Google App Engine falls under PaaS of Cloud Computing
- 5. WHY GOOGLE APP ENGINE? • Easy to build • Easy to maintain • Easy to Scale
- 6. HOW DOES IT WORK? • Build • Push • Never worry about scalability
- 7. HOW DOES IT WORK? • Build – Download SDK – Of Java, Python or GO Runtime – Build with dev tools such as GPE (Eclipse plugin), Netbeans, AppLauncher
- 8. HOW DOES IT WORK? • Push – Deploy easily with simple commands ./appengine-java-sdk/bin/appcfg.sh update myapp/war – Administer in Administration console (App Engine Dashboard)
- 9. HOW DOES IT WORK? • Scalability – Automatic performance improvements as traffic on your app increases See more in GAE Dashboard – Automatic instance creation to handle load as well as distribution of resources CPU, Bandwidth, Quota, Memory – Fault Tolerance
- 10. PERFORMANCE & SCALABILITY • Built with scalability as top priority • Memcache – Distributed RAM cache – Heavily dependent on mecache size allocated. The more the merrier
- 11. INTEGRATION Authenticati Google Google on OpenSocial XMPP Apps Data APIs Facebook GEO YouTube Django AJAX API (Maps) API
- 12. APPLICATION ENVIRONMENT – BUILDING BLOCKS • Java Runtime • Python Runtime • GO Runtime • Datastore • Suite of APIs to do common stuffs – URL Fetch – Mail – Memcache – Image Manipulation – Channel – Blobstore
- 13. APPLICATION ENVIRONMENT – BUILDING BLOCKS JAVA Same technologies / APIs you are used to
- 14. KNOW HOW YOUR APP IS DOING – PLATFORM MANAGEMENT PYTHON • Communicates via CGI protocol • Supports Django • Supports Python 2.5+ Datastore Memcache URL Fetch Mail Blobstore CGI CGI CGI CGI CGI Google App Engine
- 15. DATASTORE – OBJECT PERSISTENCE • Built on BigTable • Non-relational database management system • Consistent read and write even in a distributed network Storage 2 Storage 1 Storage 3
- 16. ADMINISTERING YOUR APP – The Admin Console • Create a new application • View request and error logs and analyze traffic • Browse your application's datastore and manage indexes • Administer your datastore • View your application's instances • Manage task queues, allowing for viewing, deleting or running individual tasks immediately • Test new versions of your application and switch the version that your users see
- 18. URL Fetch • Consume external resources with your app • Supports HTTP & HTTPS String message = URLEncoder.encode("my message", "UTF-8"); try { URL url = new URL("http://www.example.com/comment"); HttpURLConnection connection = (HttpURLConnection) url.openConnection(); connection.setDoOutput(true); connection.setRequestMethod("POST");
- 19. URL Fetch – Write and return response to client OutputStreamWriter writer = new OutputStreamWriter(connection.getOutputStream()); writer.write("message=" + message); writer.close(); if (connection.getResponseCode() == HttpURLConnection.HTTP_OK) { // OK } else { // Server returned HTTP error code. } } catch (MalformedURLException e) { // ... } catch (IOException e) { // ... } Note: Not all java.io classes are supported in app engine. Check whitelisted JRE classes
- 20. Mail • Send mail using JavaMail or Low level API try { Message msg = new MimeMessage(session); msg.setFrom(new InternetAddress("admin@example.com", "Example.com Admin")); msg.addRecipient(Message.RecipientType.TO, new InternetAddress("user@example.com", "Mr. User")); msg.setSubject("Your Example.com account has been activated"); msg.setText(msgBody); Transport.send(msg); } catch (AddressException e) { // ... } catch (MessagingException e) {
- 21. Memcache • Distributed in-memory data-cache • Improve performance • You don’t have to always persist storage in datastore. Some stuffs can be stored in-memory // A reference to the cache service private final Cache cache = new Cache(MemcacheServiceFactory .getMemcacheService());
- 22. Channel API • Communicate between your application and Google Servers asynchronously. • Very useful to chat room apps, collaborative apps
- 23. Blobstore • Serve large data objects • Insert / Retrieve / Edit, in bulk • Flexible – Direct access to blob data in memory • Fast access to blob data – 5MB in ~ 2s // Simple servlet to create the actual upload url String uploadurl = blobstoreservice.createUploadUrl(“/Upload”); // Called after upload Map<String, Blobkey> blobkeys = blobstoreservice.getUploadedBlobs(req);
- 24. Google App Engine for Business • Enterprise Application Management – Centralized domain console • Enterprise reliability and support – 99.9% Service Level Agreement – Enterprise support • Hosted SQL – Relational SQL database in the cloud • SSL on your domain • Extremely secure by default – Integrated Single Sign-on • Pricing that makes sense – Apps cost $8 per user, up to $1000 max per month (Pre-IO2011 Pricing)
- 25. ONLINE REFERENCES Get Started with App Engine http://code.google.com/appengine Get the SDK and build cool stuffs http://code.google.com/appengine/downloads.html Google Apps for Business http://code.google.com/appengine/business/ BigTable http://labs.google.com/papers/bigtable.html Google I/O 2011 http://www.google.com/events/io/2011/index-live.html Introduction to Google Cloud Platform Technologies by Chris Schalk – Google Developer Advocate http://goo.gl/zmxvF Sample projects http://goo.gl/djgMS
- 26. Questions • Website - http://opevel.com • Twitter : @opevel @googledevtools #gwt @charyorde • Opevel Services – Google App Deployment – Custom Application Development on Google App Engine – Integration services with legacy systems