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Gaelyk - Paris GGUG 2011 - Guillaume Laforge

Latest version of my presentation on Gaelyk. Covers the few novelties in version 0.6 as well.

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A lightweight
             Groovy toolkit
for developing web applications
         on Google App Engine
Guillaume Laforge / @glaforge

   • Groovy Project Manager
   • Head of Groovy Development
     at SpringSource
   • Initiator of the Grails framework
   • Founder of the Gaelyk toolkit
   • Co-author of Groovy in Action
   • Member of «Les Cast Codeurs» podcast

   • Speaker: JavaOne, QCon, JavaZone, Sun TechDays,
     Devoxx, The Spring Experience, SpringOne2GX,
     JAX, Dynamic Language World, IJTC, and more...

Copyright 2010 SpringSource. Copying, publishing or distributing without express written permission is prohibited.   2
Et la suite du le Paris GGUG ?

   • Aujourd’hui, nous allons parler de Gaelyk

   • Et demain ?
           – Spock — Mathilde Lemée
           – Transformation d’AST — Hamlet D’Arcy
           – Gradle — Grégory Boissinot


   • Et vous ?
           – Racontez-nous votre utilisation de Groovy,
             Grails, Gradle, Spock, etc.



Copyright 2010 SpringSource. Copying, publishing or distributing without express written permission is prohibited.   3
Cloud
Computing
IaaS, PaaS, SaaS



   • Software as a Service
           – Gmail, SalesForce.com                                                                                   SaaS
   • Platform as a Service
           – Google App Engine
                                                                                                                     PaaS
   • Infrastructure as a Service
           – Amazon EC2
                                                                                                                     IaaS
Copyright 2010 SpringSource. Copying, publishing or distributing without express written permission is prohibited.          5
IaaS, PaaS, SaaS



   • Software as a Service
           – Gmail, SalesForce.com                                                                                   SaaS
   • Platform as a Service
           – Google App Engine
                                                                                                                     PaaS
   • Infrastructure as a Service
           – Amazon EC2
                                                                                                                     IaaS
Copyright 2010 SpringSource. Copying, publishing or distributing without express written permission is prohibited.          5
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Gaelyk - Paris GGUG 2011 - Guillaume Laforge

  • 1. A lightweight Groovy toolkit for developing web applications on Google App Engine
  • 2. Guillaume Laforge / @glaforge • Groovy Project Manager • Head of Groovy Development at SpringSource • Initiator of the Grails framework • Founder of the Gaelyk toolkit • Co-author of Groovy in Action • Member of «Les Cast Codeurs» podcast • Speaker: JavaOne, QCon, JavaZone, Sun TechDays, Devoxx, The Spring Experience, SpringOne2GX, JAX, Dynamic Language World, IJTC, and more... Copyright 2010 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 2
  • 3. Et la suite du le Paris GGUG ? • Aujourd’hui, nous allons parler de Gaelyk • Et demain ? – Spock — Mathilde Lemée – Transformation d’AST — Hamlet D’Arcy – Gradle — Grégory Boissinot • Et vous ? – Racontez-nous votre utilisation de Groovy, Grails, Gradle, Spock, etc. Copyright 2010 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 3
  • 5. IaaS, PaaS, SaaS • Software as a Service – Gmail, SalesForce.com SaaS • Platform as a Service – Google App Engine PaaS • Infrastructure as a Service – Amazon EC2 IaaS Copyright 2010 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 5
  • 6. IaaS, PaaS, SaaS • Software as a Service – Gmail, SalesForce.com SaaS • Platform as a Service – Google App Engine PaaS • Infrastructure as a Service – Amazon EC2 IaaS Copyright 2010 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 5
  • 7. IaaS, PaaS, SaaS • Software as a Service – Gmail, SalesForce.com SaaS • Platform as a Service – Google App Engine PaaS • Infrastructure as a Service – Amazon EC2 IaaS Copyright 2010 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 5
  • 8. Google App Engine • Google’s PaaS solution • Run your app on Google’s infrastructure • Initially just Python supported • Java supported added too – Sandboxed JVM – Jetty servlet container • Several JVM-compatible language supported Copyright 2010 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 6
  • 9. Key aspects • You can use most of your usual web frameworks for developping apps on App Engine Java – A WAR file, basically! (an exploded war actually) – Uploading to the cloud by sending deltas of changes • No OS image, or software to install – Unlike with Amazon EC2 • All the scaling aspects are handled for you – Database / session replication, load balancing... • There are quotas, but you need a high traffic application to start being charged – Free to get started Copyright 2010 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 7
  • 10. Available services • Memcache – Send / receive Jabber messages (GTalk) – JCache implementation – Save on CPU and DB • User – Use Google’s user/ • URL Fetch authentication system – Access remote resources – OAuth support – HttpUrlConnection • Cron & Task queues • Mail – Schedule tasks at regular – Support both incoming and intervals outgoing emails – Queue units of work • Images • Blobstore – Resize, crop, rotate... – For storing large content • XMPP • And much more... Copyright 2010 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 8
  • 11. Limitations •Not our usual relational database – key / value datastore •30 seconds request duration limit • Forbidden to – write on the file system – create threads – use raw sockets – issue system calls – use IO / Swing / etc. directly •There’s a whitelist of classes allowed • Number of files and their size are limited Copyright 2010 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 9
  • 12. Quotas Copyright 2010 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 10
  • 13. Quotas (1/2) •Bandwidth •Mail – 1,3M requests/day – 7K calls/day – 1GB/day in/out – 2K recepients/day – 6.5 CPU hours/day – 5K emails/day – 2K attachments – 100MB of attachments •Datastore – 10M calls – 1GB/day •URL Fetch – 12GB in / 115GB out – 657K calls/day – 60 CPU hours/day – 4GB in/out /day Copyright 2010 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 11
  • 14. Quotas (2/2) •XMPP •Memcache – 657K calls/day – 8.6M calls/day – 4GB data sent/day – 10GB in – 657K recepients/day – 50GB out – 1MB invitations/day •Task queues •Image manipulation – 100K calls –864 calls/day –1GB in / 5GB out –2.5M transforms Copyright 2010 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 12
  • 15. Quotas (2/2) •XMPP •Memcache – 657K calls/day – 8.6M calls/day – 4GB data sent/day – 10GB in – 657K recepients/day – 50GB out – 1MB invitations/day •Task queues •Image manipulation – 100K calls –864 calls/day ur es –1GB in / 5GB out d fig da te –2.5M transforms O ut Copyright 2010 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 12
  • 17. The datastore... • Not your father’s relational database! «NoSQL» • Distributed key / value store – Based on Google’s «BigTable» – Schema-less approach • Supporting – Transactions and partitioning – Hierarchies through entity groups • Data access APIs – JPA and JDO • but adds a big request load time factor – Direct low-level APIs Copyright 2010 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 14
  • 18. ...and its «limitations» • You’re not using SQL –No joins – No database constraints – No aggregation functions (count, avg...) • In a query, you can only filter on one column for inequality • Transactions only available in entity groups • You can only update an entity once in a transaction Copyright 2010 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 15
  • 22. Gaelyk 0.6 released! Copyright 2010 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 18
  • 23. • Gaelyk is a lightweight Groovy toolkit on top of the Google App Engine Java SDK • Gaelyk builds on Groovy’s servlet support – Groovlets: Groovy scripts instead of raw servlets! – Groovy templates: JSP-like template engine – Both allow for a clean separation of views and logic • Gaelyk provides several enhancements around the GAE Java SDK to make life easier, thanks to Groovy’s dynamic nature Copyright 2010 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 19
  • 24. Why Groovy? • Groovy is a dynamic language for the JVM – very flexible, malleable, expressive and concise syntax – easy to learn for Java developers • deriving from the Java 5 grammar – provides powerful APIs to simplify the life of developers • possibility to dynamically enrich existing APIs – support for Groovlets and its own template engine Copyright 2010 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 20
  • 25. Copyright 2010 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 21
  • 26. Copyright 2010 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 21
  • 27. Copyright 2010 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 21
  • 28. Copyright 2010 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 21
  • 29. Copyright 2010 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 21
  • 30. Copyright 2010 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 21
  • 31. Copyright 2010 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 21
  • 32. Copyright 2010 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 21
  • 33. Copyright 2010 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 21
  • 34. Copyright 2010 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 21
  • 35. Copyright 2010 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 21
  • 36. First steps... • Go to http://gaelyk.appspot.com • Download the template project • Put your first Groovlet in /WEB-INF/groovy • And your templates in /WEB-INF/pages • And you’re ready to go! • Launch dev_appserver.sh • Go to http://localhost:8080/
  • 37. The web.xml "> <web-app xmlns="http://java.sun.com/xml/ns/javaee" version="2.5 <listener> /servlet-class> <listener-class>groovyx.gaelyk.GaelykServletContextListener< </listener> <servlet> <servlet-name>GroovletServlet</servlet-name> <servlet-class>groovyx.gaelyk.GaelykServlet</servlet-class> </servlet> <servlet> <servlet-name>TemplateServlet</servlet-name> -class> <servlet-class>groovyx.gaelyk.GaelykTemplateServlet</servlet </servlet> <servlet-mapping> <servlet-name>GroovletServlet</servlet-name> <url-pattern>*.groovy</url-pattern> </servlet-mapping> <servlet-mapping> <servlet-name>TemplateServlet</servlet-name> <url-pattern>*.gtpl</url-pattern> </servlet-mapping> </web-app> Copyright 2010 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 23
  • 38. MVC: Groovlets and templates Groovlets Templates (controllers) (views) Entities (domain) Copyright 2010 SpringSource. Copying, publishing or distributing without express written permission is prohibited.
  • 39. A groovlet • Instead of writing full-blown servlets, just write Groovy scripts (aka Groovlets) def numbers = [1, 2, 3, 4] def now = new Date() html.html { body { numbers.each { number -> p number } p now } } Copyright 2010 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 25
  • 40. A groovlet • Instead of writing full-blown servlets, just write Groovy scripts (aka Groovlets) def numbers = [1, 2, 3, 4] def now = new Date() html.html { body { numbers.each { number -> p number } p now } di ng oa } -rel to Au Copyright 2010 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 25
  • 41. A template <html> <body> <p><% def message = "Hello World!" print message %> </p> <p><%= message %></p> <p>${message}</p> <ul> <% 3.times { %> <li>${message}</li> <% } %> </ul> </body> </html> Copyright 2010 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 26
  • 42. A template <html> <body> <p><% def message = "Hello World!" print message %> </p> <p><%= message %></p> <p>${message}</p> <ul> <% 3.times { %> <li>${message}</li> <% } %> di ng </ul> el oa </body> to -r Au </html> Copyright 2010 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 26
  • 43. Shortcuts • Google services • Variables available –datastore –request / response –blobstore –context / application –memcache –sessions –capabilities –params / headers –images –out / sout / html –urlFetch –localMode / app.* –mail –userService / user • Methods available –defaultQueue / queues –include / forward / –xmpp redirect –namespace –println / print Copyright 2010 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 27
  • 44. D E M O 28
  • 46. Sending emails with Gaelyk mail.send to: 'to@gmail.com', from: 'other@gmail.com', subject: 'Hello World', htmlBody: '<bold>Hello</bold>' Copyright 2010 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 30
  • 47. ...compared to Java Properties props = new Properties(); , null); Sessio n session = Session.getDefaultInstance(props try { Message msg = new MimeMessage(session); om", "Admin"));     msg .setFrom(new InternetAddress("other@gmail.c O,     msg.addRecipient(Message.RecipientType.T , "Mr. User"));                      new InternetAddress("to@example.com"     msg.setSubject("Hello World");     msg.setText("<bold>Hello</bold>");     Transport.send(msg); } catch (AddressException e) {} } catch (MessagingException e) {} Copyright 2010 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 31
  • 48. Accessing the datastore • Direct interaction with the low-level datastore API Entity entity = new Entity("person")   map // subscript notation, like when accessing a entity['name'] = "Guillaume Laforge"   // normal property access notation entity.age = 32 entity.save() // asyncSave() entity.delete() // asyncDelete() datastore.withTransaction { // do stuff with your entities // within the transaction } // use the asynchronous datastore service datastore.async.put(entity) Copyright 2010 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 32
  • 49. Querying to be improved... import com.google.appengine.api.datastore.* der.* import static com.google.appengine.api.datastore.FetchOptions.Buil   // query the scripts stored in the datastore def query = new Query("savedscript")   // sort results by descending order of the creation date query.addSort("dateCreated", Query.SortDirection.DESCENDING)   author // filters the entities so as to return only scripts by a certain r) query.addFilter("author", Query.FilterOperator.EQUAL, params.autho   PreparedQuery preparedQuery = datastore.prepare(query)   // return only the first 10 results def entities = preparedQuery.asList( withLimit(10) ) Copyright 2010 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 33
  • 50. ...into something groovier? def entities = datastore.query { select all from savedscript sort desc by dateCreated where author == params.author limit 10 } as List Copyright 2010 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 34
  • 51. ...into something groovier? def entities = datastore.query { select all from savedscript sort desc by dateCreated where author == params.author limit 10 te d! } as List m en p le et Im o tY N Copyright 2010 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 34
  • 52. URL Routing system (1/4) • You can have friendly URL mappings with the URL routing system all "/aboutus", redirect: "/blog/2008/10/20/about-us" all "/blog/@year/@month/@day/@title", @day@title=@title" forward: "/blog.groovy?year=@year&month=@month@day= get "/blog/@year/@month/@day", @day" forward: "/blog.groovy?year=@year&month=@month@day= get "/book/isbn/@isbn", forward: "/book.groovy?isbn=@isbn", validate: { isbn ==~ /d{9}(d|X)/ } – You’ll have to configure the RouteFilter in web.xml Copyright 2010 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 35
  • 53. URL Routing system (2/4) • You can also define caching times get "/aboutus", cache: 24.hours, forward: "/aboutus.gtpl" get "/breaking-news", cache: 1.minute, forward: "/news.groovy?last=10" – Nice for GAE’s infamous «loading requests» •less critical with GAE SDK 1.4 – ability to reserve 3 instances (billing) – warmup requests Copyright 2010 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 36
  • 54. URL Routing system (3/4) • Special routes for specifying – incoming emails – jabber messages email to "/incomingMail.groovy" jabber to "/incomingXmpp.groovy" Copyright 2010 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 37
  • 55. URL Routing system (4/4) • Namespace awareness: nice for multitenancy • Capability awareness: for graceful degradation // @cust customer variable could be « acme » post "/@cust/update", forward: "/update.groovy", namespace: { "ns-$cust" } es status // different destinations depending on the GAE servic get "/speakers", forward { to "/speakers.groovy" // default destination // when the datastore is not available to "/unavailable.gtpl" on DATASTORE not ENABLED // show some maintenance is upcoming to "/speakers.groovy?maintenance=true" on DATASTORE is SCHEDULED_MAINTENANCE } Copyright 2010 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 38
  • 56. Capabilities • Google App Engine allows you to know the status and availability of the various services – DATASTORE, DATESTORE_WRITE, MEMCACHE... – ENABLED, DISABLED, UNKNOWN, SCHEDULED_MAINTENANCE – is() and not() methods if (capabilities[DATASTORE_WRITE].is(ENABLED)) { // write some content in the datastore } else { // otherwise, redirect to some maintenance page } Copyright 2010 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 39
  • 57. Task queue API // access a configured queue using the subscript notation queues['dailyEmailQueue']   // or using the property access notation queues.dailyEmailQueue   // you can also access the default queue with: queues.default defaultQueue // add a task to the queue queue << [ countdownMillis: 1000, url: "/task/dailyEmail", taskName: "sendDailyEmailNewsletter", method: 'PUT', params: [date: '20090914'], payload: content ] Copyright 2010 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 40
  • 58. Jabber / XMPP support (1/3) • Sending instant messages String recipient = "someone@gmail.com"   // check if the user is online if (xmpp.getPresence(recipient).isAvailable()) { // send the message def status = xmpp.send(to: recipient, body: "Hello, how are you?")   // checks the message was successfully // delivered to all the recipients assert status.isSuccessful() } Copyright 2010 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 41
  • 59. Jabber / XMPP support (2/3) • Sending instant messages with an XML payload String recipient = "service@gmail.com"   // check if the service is online if (xmpp.getPresence(recipient).isAvailable()) { // send the message def status = xmpp.send(to: recipient, xml: { customers { customer(id: 1) { name 'Google' } } })   // checks the message was successfully delivered to the service assert status.isSuccessful() } Copyright 2010 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 42
  • 60. Jabber / XMPP support (2/3) • Sending instant messages with an XML payload String recipient = "service@gmail.com"   // check if the service is online if (xmpp.getPresence(recipient).isAvailable()) { // send the message def status = xmpp.send(to: recipient, xml: { customers { customer(id: 1) { <customers> name 'Google' <customer id=’1’> } <name>Google</name> } </customer> </customers> })   // checks the message was successfully delivered to the service assert status.isSuccessful() } Copyright 2010 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 42
  • 61. Jabber / XMPP support (3/3) • Receving incoming instant messages – Once you’ve configured a route for jabber messages – Add the inbound message service in appengine-web.xml def message = xmpp.parseMessage(request) // get the body of the message message.body // get the sender Jabber ID message.from // get the list of recipients Jabber IDs message.recipients   // if the message is an XML document instead of a raw string message if (message.isXml()) { // get the raw XML message.stanza // get a document parsed with XmlSlurper message.xml } Copyright 2010 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 43
  • 62. Memcache service • Map notation access to the cache } class Country implements Serialzable { String name   def countryFr = new Country(name: 'France')   in the cache // use the subscript notation to put a country object // (you can also use non-string keys) memcache['FR'] = countryFr   // check that a key is present in the cache if ('FR' in memcache) { the cache using a key // use the subscript notation to get an entry from def countryFromCache = memcache['FR'] } Copyright 2010 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 44
  • 63. Closure memoization • Cache the return values for each dinstinct invocation (for a given arguments set) -> def countEntities = memcache.memoize { String kind datastore.prepare( new Query(kind) ) .countEntities() } // first call def totalPics = countEntityes('photos') // second call, hitting the cache totalPics = countEntityes('photos') Copyright 2010 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 45
  • 64. Blobstore enhancements • The blobstore allows to store some large content – images, videos, etc. def blob = ... print blob.filename // contentType, creation, size // output the content of the blob to the response blob.serve response // read the content of the blob blob.withReader { Reader r -> ... } blob.withStream { InputStream is -> ... } // delete the blob blob.delete() Copyright 2010 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 46
  • 65. Images service • Readable DSL for manipulating images def blobKey = ... def image = blobKey.image.transform { resize 1600, 1200 crop 0.1, 0.1, 0.9, 0.9 horizontal flip // vertical flip too rotate 90 feeling lucky // image corrections } def thumbnail = image.resize(100, 100) Copyright 2010 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 47
  • 66. Channel Service • For Comet-style applications def token = hannel.createChannel('clientID') channel.send 'clientID', 'Hi!' • Then in the view, in JavaScript... channel = new goog.appengine.Channel(token); socket = channel.open(); socket.onmessage = function(msg) { ... } Copyright 2010 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 48
  • 67. Simple plugin system (1/3) • Gaelyk features a simple plugin system for extending your apps and share commonalities • A plugin lets you – provide additional groovlets and templates – contribute new URL routes – add new categories – define variables in the binding – override existing binding variables – provide any static content – add new libraries – do any initialization – add before/after request hooks Copyright 2010 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 49
  • 68. Simple plugin system (2/3) • A plugin is actually just a zip file! – Basically, just a Gaelyk application, minus... •the Groovy / Gaelyk / GAE JARs •the web.xml and appengine-web.xml descriptors – But with a /WEB-INF/plugins/myplugin.groovy descriptor • A plugin must be referenced in /WEB-INF/ plugins.groovy with – install myplugin •shortcut to /WEB-INF/plugins/myplugin.groovy Copyright 2010 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 50
  • 69. Simple plugin system (3/3) • An example plugin descriptor – /WEB-INF/plugins/jsonPlugin.groovy import
net.sf.json.* import
net.sf.json.groovy.* 
 //
add
new
variables
in
the
binding binding
{ le jsonLibVersion
=
"2.3"









//
a
simple
string
variab 
of
a
3rd‐party
JAR json
=
new
JsonGroovyBuilder()

//
an
instance
of
a
class } 
 //
add
new
routes
with
the
usual
routing
system
format routes
{ get
"/json",
forward:
"/json.groovy" } 
 //
install
a
category
you've
developped categories
jsonlib.JsonlibCategory before
{
req,
resp
‐>
...
}
//
or
after 
 //
any
other
initialization
code
you'd
need Copyright 2010 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 51
  • 70. a ry m m S u Copyright 2010 SpringSource. Copying, publishing or distributing without express written permission is prohibited.
  • 71. Summary • Easy access to a cloud solution –Deploying Java apps, as easily as you would with PHP • Familiar to Java folks –Your good old Servlet centric webapps style • Pretty cheap –You need a high-trafficed website to reach the quotas • Gaelyk provides a simplified approach to creating Servlet centric webapps in a productive manner –Leveraging Groovy’s servlet / template support and dynamic capabilities Copyright 2010 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 53
  • 72. What’s coming next? • Expect more sugar around the Datastore – An SQL-like query DSL – Easier relationship management (builder?) • Perhaps pre-compiled groovlets and templates – Less needed since SDK 1.4 • (reserve 3 hot instances, warmup requests) • Testing facilities specific to Gaelyk –testing utility class, Spock-specific ones... • Anything that’ll come up in newer GAE SDK versions Copyright 2010 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 54
  • 73. Thanks for your attention! e e Laforg velopment Gu illaum oovy De m of Gr e@gmail.co Head laforg E mail: g glaforge @ T witter: • References: • http://gaelyk.appspot.com/ • http://groovy.codehaus.org/ • http://code.google.com/ appengine/ Copyright 2010 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 55
  • 74. Picture credits Light bulb: https://newsline.llnl.gov/retooling/mar/03.28.08_images/lightBulb.png Speed limit : http://www.morguefile.com/archive/display/18492 Warehouse : http://www.morguefile.com/archive/display/85628 Check mark: http://www.lnl.infn.it/~epics/WikiDumps/localhost/600px-symbol_ok.svg.png Puzzle: http://www.everystockphoto.com/photo.php?imageId=263521 Light bulb: https://newsline.llnl.gov/retooling/mar/03.28.08_images/lightBulb.png Clouds http://www.morguefile.com/archive/display/627059 http://www.morguefile.com/archive/display/625552 http://www.morguefile.com/archive/display/629785 Duke ok GAE http://weblogs.java.net/blog/felipegaucho/archive/ae_gwt_java.png Python logo : http://python.org/images/python-logo.gif Gaelyc cross with clouds : http://www.morguefile.com/archive/display/37889 Speed limit : http://www.morguefile.com/archive/display/18492 Warehouse : http://www.morguefile.com/archive/display/85628 Snow foot steps : http://www.flickr.com/photos/robinvanmourik/2875929243/ Sugar : http://www.flickr.com/photos/ayelie/441101223/sizes/l/ Press release: http://www.napleswebdesign.net/wp-content/uploads/2009/06/press_release_11.jpg Copyright 2010 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 56