Can Scala be used with Service Component Architecture?

Question

Does anyone know if Scala can be used with SCA (Service Component Architecture) open source implementations such as Fabric3 or Apache Tuscany? I found no such information online. I know Scala compiles to Java, but I was wondering if dependency injection would complicate things. Thanks.

Answer 1

The FraSCAti platform already supports Scala as an implementation language for SCA components. You can check out the following example:

@Service
trait PrintService {
    def print(msg: String)
}

class Server extends PrintService {    
    println("SERVER created.")

    @Property protected var header = "->"
    @Property private var count = 1

    /** PrintService implementation. */
    def print(msg: String) {
        println("Server: begin printing...")
        for (i <- 0 until count)
            println(header + msg)
        println("Server: print done.")
    }        
}

@Service(classOf[Runnable])
class Client extends Runnable {
    println("CLIENT created")

    @Reference(required = true) private var service: PrintService = _
    def setPrintService(s: PrintService) { service = s }

    // Runnable interface implementation
    def run = service print "hello world"
}

The examples in the repository also illustrates how to use beans to implement these components.