Callback Client in Webservice

[Nikita Dutt]

Hi All,

How do call back clients work in JAX-WS web-services ? . I have managed to write some sample code but unable to understand how does it work. Inline in the code

import java.util.concurrent.ExecutionException;

import javax.xml.ws.AsyncHandler;
import javax.xml.ws.BindingProvider;

public class TestWebService {

	/**
	 * @param args
	 */
	public static void main(String[] args) {

		Request parameters = new Request();
		User value = new User();

		value.setFirstName("Luke ");
		value.setLastName("Murphy ");

		parameters.setCardUser(value);

		UserService userService = new UserService();
		ServicePortType servicePortType = userService.getUserServicePort();
		BindingProvider bindingProvider = (BindingProvider) servicePortType;
		bindingProvider.getRequestContext().put(
				BindingProvider.ENDPOINT_ADDRESS_PROPERTY,
				"http://localhost:8080/mywebservice/MyService");

		System.out.println(" Calling clients ---------------> ");

		// Callback clients
		new TestWebService().getUserDetailsAsyncCC(parameters);

		// Synchronzed clients
		new TestWebService().mySynchronized(parameters);
		

		System.out.println(" Main method ends ");
	}

	// Synchronzed
	public void mySynchronized(Request request) {

		try {
			UserService userService = new UserService();
			ServicePortType servicePortType = userService.getUserServicePort();
			BindingProvider bindingProvider = (BindingProvider) servicePortType;
			bindingProvider.getRequestContext().put(
					BindingProvider.ENDPOINT_ADDRESS_PROPERTY,
					"http://localhost:8080/mywebservice/MyService");

			Response rep = servicePortType.getUserDetails(request);
			System.out
					.println("-------------------------------------------------------------------------");
			System.out.println("Webservice Response = "
					+ rep.getMessageReturned() + " " + rep.getOtherDetails());
			System.out
					.println("-------------------------------------------------------------------------");
		} catch (ServiceException e) {
			System.out.print(" Error Code " + e.getLocalizedMessage());
			System.out.println(" -- Fault Message "
					+ e.getFaultInfo().getFaultMessage());
		}

	}

	// Callback clients
	private void getUserDetailsAsyncCC(Request request) {
		UserService userService = new UserService();
		ServicePortType servicePortType = userService.getUserServicePort();
		BindingProvider bindingProvider = (BindingProvider) servicePortType;
		bindingProvider.getRequestContext().put(
				BindingProvider.ENDPOINT_ADDRESS_PROPERTY,
				"http://localhost:8080/mywebservice/MyService");
		System.out.println(" Callback client called the webservice ");

		servicePortType.getUserDetailsAsync(request,
				new AsyncHandler<com.sample1.myasync.Response>() {
					public void handleResponse(
							javax.xml.ws.Response<com.sample1.myasync.Response> res) {
						try {
							System.out
									.println("Callback client has got a response  ");
						} catch (Exception e) {
							e.printStackTrace();
						}
					}

				});

	}
}

If i don't invoke method mySynchronized after invoking getUserDetailsAsyncCC , i will not get a response from my hosted web service.


Output if invoke in order


new TestWebService().getUserDetailsAsyncCC(parameters);
new TestWebService().mySynchronized(parameters);

IS

Calling clients --------------->
Callback client called the webservice
Callback client has got a response
-------------------------------------------------------------------------
Webservice Response = Hello Luke Murphy Today's Date = Tue Aug 16 11:18:34 IST 2011
-------------------------------------------------------------------------
Main method ends



Output if invoke just


new TestWebService().getUserDetailsAsyncCC(parameters);

IS

Calling clients --------------->
Callback client called the webservice
Main method ends


This time it didn't get a response from webservice and i didnt get Callback client has got a response


Now output if invoke in order

new TestWebService().getUserDetailsAsyncCC(parameters);
new TestWebService().mySynchronized(parameters);
new TestWebService().mySynchronized(parameters);


Calling clients --------------->
Callback client called the webservice
Callback client has got a response
-------------------------------------------------------------------------
Webservice Response = Hello Luke Murphy Today's Date = Tue Aug 16 11:22:55 IST 2011
-------------------------------------------------------------------------
-------------------------------------------------------------------------
Webservice Response = Hello Luke Murphy Today's Date = Tue Aug 16 11:22:55 IST 2011
-------------------------------------------------------------------------
Main method ends

This time it didn't invoke the callback client twice ?


Please explain how do callback client works ?


Webservice server side code is

import java.util.Date;

import com.sample.webservice.FaultInfo;
import com.sample.webservice.Request;
import com.sample.webservice.Response;
import com.sample.webservice.ServiceException;
import com.sample.webservice.ServicePortType;

@javax.jws.WebService(targetNamespace = "http://service.handler.jaxws.com/service", endpointInterface = "com.sample.webservice.ServicePortType")
public class MyServiceImpl implements ServicePortType {

	@Override
	public Response getUserDetails(Request parameters) throws ServiceException {

		System.out.println(" Entering  MyServiceImpl::getUserDetails ");

		Response response = null;

		String firstName = parameters.getCardUser().getFirstName();

		String lastName = parameters.getCardUser().getLastName();

		if (firstName == null || lastName == null
				|| firstName.trim().length() == 0
				|| lastName.trim().length() == 0) {
			FaultInfo faultInfo = new FaultInfo();
			faultInfo
					.setFaultMessage("First or  Last Name are either empty or set as null");
			ServiceException serviceException = new ServiceException("ER001",
					faultInfo);
			throw serviceException;
		} else {
			response = new Response();
			response.setMessageReturned(" Hello " + firstName + " " + lastName);
			response.setOtherDetails(" Today's  Date = "
					+ new Date().toString());
		}

		System.out.println(" Exiting  MyServiceImpl::getUserDetails ");
		return response;

	}

}

Thanks in advance