Re: Async web services, do they exist?

[Ricky Ho]

I guess the behavior you observe is "implementation dependent". The SOAP server you've used doesn't take advantage of the optimization opportunity where things can be execute in parallel.

But you certainly can achieve what you want in the following ways ...

public class AsyncService {
static Buffer buffer = Buffer.getSingleton();

public String submitRequest(Request request) {
String trackerId = buffer.save(request); // save in buffer
return trackerId;
}

public Response pollForResponse(String trackerId) {
if (buffer.isResponseReady(trackerId)) {
return (buffer.getResponse(trackerId));
} else {
return (null);
}
}

public void submitRequestWithCallback(Request request, ICallback callback) {
buffer.save(request, callback);
}
}

public class Execution extends Thread {
public void run () {
Request request = buffer.takeRequest();
Response response = handle(request);
if (request.needsCallback()) {
ICallback callback = buffer.getCallback(request.getTrackerId());
callback.sendResponse(response);
} else {
buffer.saveResponse(request.getTrackerId(), response)
}
}
}

Rgds, Ricky

At 02:29 PM 11/27/2002 +1100, Trond Hjelmaas wrote:

Hi,

I have a problem with finding relevant info regarding asynch Web Services.


For example, I've got this javaclass, all it does is wait 10 seconds

public class delay{
        public void wait10sec(){
                /*some code for 10 sec delay*/
        }

}

it has WSDL like:
......
   <message name="wait10sec0Request"/>
   <portType name="blahPortType">
      <operation name="wait10sec">
         <input name="wait10sec0Request" message="tns:wait10sec0Request"/>
      </operation>
   </portType>
   <binding name="blahBinding" type="tns:blahPortType">
      <soap:binding style="rpc"
                transport="http://schemas.xmlsoap.org/soap/http"/>
      <operation name="wait10sec">
         <soap:operation soapAction="" style="rpc"/>
         <input name="wait10sec0Request">
            <soap:body use="encoded" namespace="blah"
                encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"/>
         </input>
      </operation>
   </binding>
   <service name="blah">
      <port name="blahPort" binding="tns:blahBinding">
         <soap:address
                location="http://some_URTL:8888/blah_ctx/blah"/>
      </port>
   </service>

NOTE: I have change WSDL to have no response, the original has reponse
message listed, but is was empty.....

According to some mail I read Web Services are async if they don't have
any reponse method.

I uploaded this and invoke the method using Oracle9ias (9.0.0.3), the
invocation halts for 10 seconds, and does NOT return ASAP (which is what I
need).

Any suggestions about how to make asynch Web Services are very
appreciated!

Regards, Trond