App Engine Meetup

Wednesday, May 5, 2010

JRuby on Google App Engine Extending the Java Platform & APIs John Woodell May 4, 2010 2 Sunday, May 9, 2010

Google App Engine 3 Wednesday, May 5, 2010

Key Features • No need to install or maintain your own stack • Use Google scalable services via standard APIs • Built-in application management console • Google does the scaling for you • Pay-as-you-go, with free quota to get started 4 Wednesday, May 5, 2010

Quotas and Billing Resource Provided Free Additional Cost CPU time 6.5 hours/day $0.10/hour Bandwidth In 1GByte/day $0.10/GByte Bandwidth Out 1GByte/day $0.12/GByte Stored Data 1 GB $0.005/GB-day Emails sent 2000/day to users $0.0001/email 50000/day to admins 6 Wednesday, May 5, 2010

Key Limitations • No native code • No threads or sockets • No writing to the filesystem • No relational database • No more than 30 seconds per request 7 Wednesday, May 5, 2010

JRuby on App Engine 8 Wednesday, May 5, 2010

Current Issues with JRuby on App Engine • Several seconds to “spin-up” a new JRuby instance • Some gems still need their extensions ported to Java • Not officially supported, but you have all that you need + 9 Wednesday, May 5, 2010

App Engine Gems • Development Gems – appengine-rack – appengine-tools . . . . dev_appserver.rb & appcfg.rb – appengine-sdk – appengine-jruby-jars • Runtime Gems – appengine-rack – dm-appengine – appengine-apis 10 Wednesday, May 5, 2010

Dev AppServer • Local implementation of services – LRU memcache – Disk-backed datastore – HttpClient-backed URLFetch • Emulates the production environment – Sandbox restrictions may be inconsistent, so run tests on production servers as well 11 Wednesday, May 5, 2010

Deployment • Your app lives at – <app_id>.appspot.com, or – Custom domain with Google Apps • Deploying uploads – Static files – Resource files – Other metadata (datastore indexes, cron jobs) • Admin Console – dashboards – manage multiple versions – view logs 12 Wednesday, May 5, 2010

App Engine JRuby APIs • AppEngine::Users • AppEngine::Datastore • AppEngine::Memcache • AppEngine::Mail • AppEngine::URLFetch • AppEngine::Images • AppEngine::Logger • AppEngine::XMPP • AppEngine::Labs::TaskQueue 13 Wednesday, May 5, 2010

Users API • Existing User Account • Restrict your app to a domain map '/src' do use AppEngine::Rack::AdminRequired use AppEngine::Rack::SSLRequired run ActionController::Dispatcher.new end map '/' do run ActionController::Dispatcher.new end 14 Wednesday, May 5, 2010

Datastore API + DataMapper # Comparisons you’d expect Zoo.first(:name => 'Galveston') # The 'gt/lt' means greater/less-than. Person.all(:age.gt => 30) Person.all(:age.lt => 40) # The 'gte/lte' means greather/less-than-or-equal-to. Person.all(:age.gte => 30) Person.all(:age.lte => 40) # The value of a pair is an Array Person.all(:name => 'Sam', :id => [ 1, 2, 3, 4, 5 ]) Person.all(:name => [ 'bob', 'rick', 'steve' ]) # Ordering Person.all(:order => [ :age.desc ]) 15 Wednesday, May 5, 2010

Memcache API • No configuration required • Same API as Ruby-Memcache • Keys can be any Symbol or String • Can store any Marshalable or Serializable object cache = AppEngine::Memcache.new cache.set_many({:a => 1, :foo => 1..5}) a, foo = cache.get(:a, :foo) 16 Wednesday, May 5, 2010

URL Fetch API • Drop-in replacement for Net::HTTP AppEngine::URLFetch.fetch(url, options={}) :method :payload :headers :allow_truncated :follow_redirects :deadline 17 Wednesday, May 5, 2010

XMPP API 18 Wednesday, May 5, 2010

App Engine JRuby Milestones • 2009-04-07 Early look at Java • 2009-04-08 @olabini publishes blog post on YARBL • 2009-05-06 RailsConf (Sinatra Demo) • 2009-11-02 0.0.5 bundler, precompilation & Duby • 2009-11-20 RubyConf (Rails 3 Demo) • 2009-12-02 0.0.6 Image manipulation examples • 2010-01-21 0.0.8 Rails 2.3.5 Primer for DM & TinyDS • 2010-01-26 0.0.9 Mechanize and Hpricot examples • 2010-02-19 @carlhuda publishes bundler08 • 2010-02-27 0.0.10 ActionMailer example • 2010-04-08 0.0.11 Deferred Dispatcher (early look) • 2010-05-05 0.0.12 JRuby 1.5.0.dev (jruby-openssl) 19 Wednesday, May 5, 2010

App Engine Product Roadmap • SSL for third-party domains • Background servers capable of running for longer than 30s • Ability to reserve instances to reduce application loading overhead • Ability to select different availability vs. latency options for Datastore • Support for mapping operations across datasets • Datastore dump and restore facility • Raise request/response size limits for some APIs • Improved monitoring and alerting of application serving • Support for Browser Push (Comet) communication • Built-in support for OAuth & OpenID 20 Wednesday, May 5, 2010

Resources • John Woodell, woodie@google.com • Twitter, @johnwoodell • Blog: JRuby on App Engine Blog – http://jruby-appengine.blogspot.com/ • Google App Engine for JRuby – http://code.google.com/p/appengine-jruby/ • Google Group – http://groups.google.com/group/appengine-jruby 21 Wednesday, May 5, 2010

Bio • John Wang iPhone, Android, and Web Developer at Fresh Blocks in Honolulu, HI Twitter: @johntwang Github: jwang • Objective I wanted to show that JRuby on GAE is a viable solution for providing RESTful JSON with Google’s Datastore to iPhone and Android apps. Tuesday, May 4, 2010

My App • iPhone-JSON is a demo app used to show that AppEngine with Rails 2.3.5 is fully capable of being a RESTful provider with DataMapper. • It is currently up and running on iphone- json.appspot.com for others to copy. • It is also serving as the datastore for an iPhone and an iPad App that are awaiting approval from Apple. Tuesday, May 4, 2010

What I Learned • When I started out, I knew I would have to use the DM-Serializer plugin to add back in the RESTful abilities to DM. I did not expect the JSON being POSTed to be case-sensitive for the parameters. • There was a small bug in the DM adapter that was causing problems initially, but that was remedied very quickly thanks to John. • I did need to add in the necessary render statements to each area in the generated responds_to and was also able to get custom REST actions to work without any problems. • Most 3rd Party gems come with scripts to generate models, tables, etc take for work as scripts are written for ActiveRecord and not DataMapper. I needed to modify some scripts for other 3-party gems. Primarily the ones I’m using for doing Push Notiﬁcations to the iPhone from GAE. Tuesday, May 4, 2010

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MYSELF • Joshua Moore, Quality • Find me here: Assurance Manger at Armorize Technologies • Twitter: @codingforrent • Wanted to develop apps • github: http://github.com/ with Rails without the pains joshsmoore of being a sys admin so started to work with Rails • blog: on the GAE www.codingforrent.com Monday, May 3, 2010

MY APP • Rails Turbine - Goal to be a no conﬁg drop in blog engine for built with Rails on the GAE (still a work in progress). • Open source on github • Built with Rails 2.3.5, Datamapper, and HAML • Coauthor the rails_dm_datastore gem to ﬁx some rails/dm bugs • Currently it powers my blog (www.codingforrent.com) Monday, May 3, 2010

ROAD BLOCKS • Initiallyhad some bugs with datamapper and rails not always playing nice together. Most of those are worked out in the rails_dm_datastore. • The next biggest problem has been testing. It can be difﬁcult and sometimes unreliable for testing within the Datastore environment. Monday, May 3, 2010

Wednesday, May 5, 2010

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App Engine Meetup

by John Woodell on May 09, 2010

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App Engine Meetup — Presentation Transcript