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XML/RPC driver as JCA Scala connector

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XML/RPC driver as JCA Scala connector

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Interoperability and reusability are key features of SOA architecture.  

The Java EE Connector architecture defines a standard architecture for connecting the Java EE platform to heterogeneous EISs. This article presents an XML/RPC  adapter using a Scala JCA outbound connector to an IN/AIR legacy system.

JCA and integration

"For enterprise application integration, bi-directional connectivity between enterprise applications and EIS is essential. The Java EE Connector architecture defines standard contracts that allow bi-directional connectivity between enterprise applications and EISs. It also formalizes the relationships, interactions, and the packaging of the integration layer, thus enabling enterprise application integration." 
JCA 1.6 p 35

The connector architecture defines a set of scalable, secure, and transactional mechanisms that enable the integration of EISs with application servers and enterprise application.

 ESB and JCA
Using a UCIP JCA connector rather than using an XML/RPC raw driver lets you:

  1. Hide connection complexity.
  2. Use connection pooling and scalability.
  3. Use a standard adapter that can be deployed with any JEE 6 server from an m x n integration problem to an m + n solution


The use of a JCA resource adapter inside a JEE solution is the same as interacting with a database or queue: protocol communication and wire negotiation... are hidden to the final user.  

Two interfaces are presented to a customer:

1) A factory trait:

trait AirConnectorFactory extends Referenceable with Function0[AirConnector] 
2) The connector trait:
trait AirConnector {
   def fire(elem : Elem) : Option[Elem]
As an outbound communication where the resource adapter allows an ESB or EE application server to connect to an IN/AIR node and perform work. All communication is initiated by the application. The Air connector factory should be injected as any resource and used like the following.
var airConnectorFactory : AirConnectorFactory = _

val output = airConnectorFactory().fire(input)

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