Groovy Jabber-RPC

allows you to make XML-RPC calls using the Jabber protocol. Groovy has a Jabber-RPC implementation which allows you to create a local Jabber-RPC server and to make calls on remote Jabber-RPC servers. Jabber servers are widely available and very easy to set up and run. The Google GTalk service uses Jabber and the Groovy Jabber-RPC package works over GTalk.
We use the excellent

Jabber library from Jive Software to handle the protocol details.

The Server

It's really easy to set up a server which provides a set of remotely callable functions.

1. Create a server object
   

   import groovy.net.xmlrpc.*
   import org.jivesoftware.smack.XMPPConnection
   
       def server = new JabberRPCServer()

   
   
2. Add some methods
   

   sever.echo = {return it}  // the closure is now named "echo" and is remotely callable

   
   
3. Start the server
   

   def serverConnection = new XMPPConnection("talk.example.org", 5222, "example.org")
       serverConnection.login("myServerId", "myServerPassword")   // logging in as myServerId@example.org
       server.startServer(serverConnection)

   
   
4. You're done!

The Client

It's pretty easy to make the remote calls too

1. Create a proxy object to represent the remote server
   

   def clientConnection = new XMPPConnection("talk.example.org", 5222, "example.org")
       clientConnection.login("myClientId", "myClientPassword")   // logging in as myClientId@example.orgm
       def serverProxy = new JabberRPCServerProxy(clientConnection, "myServerId")

   
   
2. Call the remote method via the proxy
   

   println severProxy.echo("Hello World!")

   
   
3. As long as myClientId@example.org and myServerId@example.org are buddies then the call will be made and the result returned