SCA Java binding.ajax

<binding.ajax>

Tuscany supports web browser clients using AJAX to communicate with with SCA components by using the <binding.ajax> SCDL extension. This enables remote web browser clients to easily make RPC style calls to server-side SCA components and for server-side components to ca.

This binding has no attributes or elements so to include it on a SCA service or reference simply requires the following SCDL:

   <binding.jsonrpc/>

Also see <binding.jsonrpc which provides some similar function.

Any JSON-RPC client may be used to access SCA services which use <binding.jsonrpc>, but to simplify the task for web browsers the binding can generate a script which may be included within an HTML document to set up proxy objects for each SCA service within the HTML page environment.

This script is used by simply including the following script tag within the HTML page:

    <script type="text/javascript" src="SCA/SCADomain/scaDomain.js" />

This initializes the proxys for the SCA services which can then be used make requests to the server-side components. For example, if there was a service named "myService" which had operations "aOnewayRequest" and "anRpcRequest" the scripts in the HTML page could now invoke these opperations with the following:

myService.aOnewayRequest(args);

or

myService.anRpcRequest(args, responseFunction);

Using SCA JSON-RPC services with Dojo

Apache Tuscany JSON-RPC services provide built-in support for Dojo RPC. The Dojo toolkit is a popular framework for writing Ajax/Web 2.0 style browser client applications. Tuscany SCA services which use <binding.jsonrpc> will by default support the Simple Method Description (SMD) protocol. SMD is similar to ?wsdl for Web services, entering a service endpoint appended with ?smd will return a SMD descriptor for the service.

Using Tuscany SCA services with Dojo can therefore be as simple as the following:

  var myService = new dojo.rpc.JsonService("SCA/SCADomain/MyService?smd");

Some examples: