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Episode 48 - Google Wave interview with Joe Gregorio

Joe Gregorio, Google Developer Advocate and member of the Google App Engine team, is also working on Google Wave, a new collaborative environment that mixes concepts from IRC, Mail, IM, and document sharing.

  1. APIs
  2. Example bots:  builtins:  Linky automatically makes links of text typed in to the wave. 
  3. For more examples, look at
  4. Developers can sign up for sandbox access here
  5. Non-Developers can request a preview account here
  6. No public client/server API yet, has links to wave protocol forum
Direct download: TechCast-48-Google-Wave-Joe-Gregorio.mp3
Category:techcast -- posted at: 6:00am EST

Episode 47 - Jonas Boner on the Akka framework, Scala, and highly scalable applications

Today's podcast features Jonas Bonér, the creator of the Akka framework.  If you've been listening to the podcast, especially to Episode #37 with Alex Miller on Java Concurrency, here is an alternative approach to providing scalability on the Java VM.

Akka features an implementation of Actors, Software Transactional Memory, and Transactors, a hybrid approach to working with STM inside of Actors themselves.  Jonas also provides a mechanism for writing these components inside of the Java language as well.

Actors are not a direct part of the Scala language. Rather, they are implemented as a library.  There are, in fact, at least three implementations.  Jonas Bonér's Akka framework includes actors as well as access to Software Transactional Memory.  In this episode, my colleague Jamie Allen and I interview Jonas to try to pull apart what Actors and Software Transactional Memory are, and how they can help developers write highly scalable, concurrent applications.


  1. The Akka Mountain in Sweden (Akka is named after the mountain)
  2. The Akka framework homepage is (or or even
  3. A good blog entry about Akka 
  4. The high level overview of Akka from the akkasource site
  5. Jonas' home page and the Akka twitter handle


Direct download: Chariot_TechCast_47-Jonas_Boner_and_Akka.mp3
Category:techcast -- posted at: 10:51am EST

Episode 46 - Guillaume LaForge on Groovy and Gaelyk, an App Engine Groovy platform

Today's interview features the Groovy luminary Guillaume LaForge.  Guiallume's work on improving the Groovy language paved the way for the innovative frameworks such as Grails and Griffon, and showed a whole generation of Java developers to stop worrying and love dynamic programming.

Guiallaume is the Groovy project lead, and is constantly improving the language.  One of his newer efforts is the App Engine framework Gaelyk.  Running on top of Groovy, this framework allows developers to build Google App Engine web sites with very little effort.  We talked to Guillaume about the project, and about his thoughts on Java 7 as well.  This week we took questions from the 'twitterverse', and I started using Google Wave to edit my show notes.   

Upcoming Groovy 1.7 features...

  1. Support for anonymous inner classes (before suggested you use closures)
  2. Providing an AST Builder, to make it easier to provide AST transformations (such as @Singleton, @Delegate).  AST transformations are compiled into bytecode.

Gaelyk - The Google App Engine framework

  1. Groovlets, small groovy web scripts - just write a script!
  2. Templates - separate Groovy code from view
  3. Injects Google features into scripts, not abstract them too much
  4. Sitemesh templating: Guillaume is researching sitemesh integration but likely not including it directly (providing instructions at some point)
  5. Question asked by @wmacguyver on what Groovy
    1. DataStore was easy to wrap with a thin veneer - is hoping to more groovify and add a DSL around it
    2. Mail - added ONE method to enrich base class to make it eaiser to use from scripting
    3. Route support in 0.32 - was more work but not complex to do...
  6. Asked about what projects running in Gaelyk - early days... but check out - a way of executing Groovy code online and sharing snippets.  Written by Guillaume.  Another one out there is a javascript toolkit for writing iphone web apps iui - demo app is built on Gaelyk (no link avaialble)
  7. Also hosted on Gaelyk:  Gaelyk project itself
  8. Community feedback - will drive some enhancements, obviously Guillaume is very committed to Groovy language too!
  9. Users have become contributors - submitting suggested changes / patches, these are very welcome.
  10. Future feature:   Querying support on deck potentially for datastore, simple SQL queries don't work on a NO-SQL database.

Question from twitter user @HamletDRC: @techcast Which JDK7 feature will effect Groovy the most: Closures, Jigsaw, or something else? (question for @glaforge)

Java 1.7 Closures -

  1. The working document - mentions dynamic interfaces for closures, groovyc compiler could create same interfaces under the hood - could be interoperable POTENTIALLY...
  2. Could we pass groovy closures to a java class?  No implementation yet, so we need to see how languages work together...
  3. Java closures - cannot access non-final vars, etc... Shouldn't replace Groovy closures with Java closures...

Jigsaw (JDK modularity)

  1. Interesting to investigate.  Would be nice to modularize Groovy a bit - maybe pull pieces into modules (groovlets, etc)... OSGi is an option as well, need to evaluate. 

Thanks also to lucaxtex for his tweet: lucastex @glaforge incredible work on #gaelyk UrlRoutes! This is getting sweeter each day :)

Direct download: TechCast-46-Gaelyk-with-Guillaume.mp3
Category:techcast -- posted at: 11:43am EST

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