Diameter support in Cipango is designed to offer a servlet-like programming model.
Diameter support is optional and should be activated first. To start Cipango with diameter, add the diameter.xml to the command runline. For instance:
java -jar start.jar --ini=start-cipango.ini etc/diameter.xml |
Diameter messages are logged in the file ${jetty.home}/logs/yyyy_mm_dd.diameter.log
(replace yyyy_mm_dd by the current date).
Javadoc is available at http://www.cipango.org/javadoc/diameter-2.0/.
To use diameter, a class implementing the DiameterListener
must be declared within the application. This is similar to the TimerListener
used for the SIP Servlet TimerService.This interface is then invoked when diameter messages are received.
The DiameterListener
is defined as follows:
package org.cipango.diameter.api; public interface DiameterListener extends EventListener { /** * The <code>handle</code> method is invoked by the container when a Diameter message should be * passed to the application. */ void handle(DiameterServletMessage message) throws IOException; } |
The DiameterFactory
class is used to create instances of DiameterServletRequest
.
Cipango makes an instance of org.cipango.diameter.api.DiameterFactory
available to servlets via the servlet context attribute of the same name, org.cipango.diameter.api.DiameterFactory
.
The following code sample illustrates how to create an UDR
request:
protected void doRequest(SipServletRequest sipRequest) throws ServletException, IOException { DiameterFactory factory = (DiameterFactory) getServletContext().getAttribute(DiameterFactory.class.getName()); DiameterServletRequest request = factory.createRequest(sipRequest.getApplicationSession(),Sh.SH_APPLICATION_ID, Sh.UDR,"home1.net","hss1.home1.net"); AVPList userIdentity = new AVPList(); userIdentity.add(Cx.PUBLIC_IDENTITY, "sip:alice@atlanta.com"); request.add(Sh.USER_IDENTITY, userIdentity); request.add(Sh.DATA_REFERENCE, Sh.DataReference.IMSUserState); request.setAttribute("request", sipRequest); request.send(); } |
When the UDA answer
is received, the handle
method of the DiameterListener
interface is invoked and the requested data could be retrieved as follows:
public void handle(DiameterServletMessage message) throws IOException { try { if (!message.isRequest()) { DiameterServletAnswer answer = (DiameterServletAnswer) message; byte[] data = answer.get(Sh.USER_DATA); // process sh data SipServletRequest request = (SipServletRequest) answer.getRequest().getAttribute("request"); SipServletResponse response = request.createResponse(200); response.send(); response.getApplicationSession().invalidate(); } else // Error processing } catch (Throwable e) { // Error processing } } |