Scala in the Enterprise

Intro
Eric Pederson
ericacm@gmail.com / @ericacm
Background in Java, Groovy, Javascript, PHP, etc.
Consulting at NYSE
One Scala app in production, one in QA
Contract finished 1Q11

Platform
JDK 1.6
Scala 2.8
Started development in March
2.8 was bundled with Intellij IDEA
Using lots of Java libs
Spring, Hibernate, CXF, Mule, ApacheMQ
Bouncycastle, OpenSAML, Velocity, etc, etc.
Only Scala lib currently in use is ScalaTest

What’s been working well
Improved productivity
Concise code
Java interop
Type inferencing
REPL (mvnscala:console)
Collections API
Especially higher ordered fns (map/filter/etc)
Lambdas / Closures
Prevents proliferation of classes

What’s been working well
Mixins / trait stacking
trait UserIdentifierCmd extends ApiKeyCmd {..}
trait RoleIdCmd extends ApiKeyCmd {..}
object cmd extends UserIdentifierCmd with RoleIdCmd {..}
For comprehenions / expressions
Case classes / pattern matching
Actors
Type aliases
Structural (duck) typing
Import aliases

Complaints
Eclipse support is weak
Lack of type inferencing in IDEA
Collections are not serializable
Cannot write classfile annotations in Scala
Would like Groovy style .? null short circuiting

Complaints
Someone needs to write a “FP in Scala” book
Plenty of literature using Haskell
Blog posts here and there on advanced Scala FP
scalaz is looking promising in this area
Something like “Learn you a Haskell for Great Good” plus an in-depth discussion on scalaz.

Currently looking at
Lift “Box” or similar
Options don’t include failure info
scalaz Validation
http://applicative-errors-scala.googlecode.com/svn/artifacts/0.6/html/index.html
http://www.milessabin.com/misc/Chain.scala
Camel
To replace Mule
Scala DSL, Akka integration
Scalate / SSP
scala-time
scalaz

Scala in the Enterprise

by Eric Pederson on Nov 30, 2010

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