On 9/24/07, Simon Laws <[EMAIL PROTECTED]> wrote:
>
>
>
> On 9/21/07, Giorgio Zoppi <[EMAIL PROTECTED]> wrote:
> >
> > Hi,
> > i've found the bug that it doens't permit myself to use SCA Binding over
> > WebService modifying the distributed-calculator. I found it (on Tuscany
> > 1.0 rc3) following the chain towards the wire, and i discovered that
> > it's an Axis Fault. If you modify in your distributed calculator sample
> > the SubtractionService in the following way:
> > @Remotable
> > public interface SubtractService {
> > @OneWay
> > void subtract(double n1, double n2);
> >
> > }
> > public class SubtractServiceImpl implements SubtractService {
> >
> > public void subtract(double n1, double n2) {
> > System.out.println("SubtractService - subtract " + n1 + " and "
> > + n2);
> > //return n1 - n2;
> > }
> >
> > }
> > I know that it doesn't nothing...but it's a proof of concept.
> > And in the calculator node:
> >
> > for (int k = 0; k < 10; ++k)
> > calculatorService.subtract(2*k+3, k);
> >
> >
> > The nodeC with current Axis2OneWayBindingInvoker, even if it's called 10
> > times..the receiver gets two messages..
> > So in the nodeC terminal you can see only for example:
> >
> > [java] SubtractService - subtract 15.0 and 6.0
> > [java] SubtractService - subtract 17.0 and 7.0
> >
> > The reason is due to the Axis HTTP REUSE:
> > If you change in Axis2OneWayBindingInvoker
> >
> > requestMC.getOptions ().setProperty(HTTPConstants.REUSE_HTTP_CLIENT,
> > Boolean.TRUE);
> >
> > to:
> > requestMC.getOptions().setProperty(HTTPConstants.REUSE_HTTP_CLIENT,
> > Boolean.FALSE);
> >
> > It works! I suspect that there's a bug or a queue full in Axis because
> > it seems that if you send something too fast it doesn't work (I'll see
> > it tomorrow, because I don't know how the http client reuse works in
> > Axis).
> >
> > The next test, I'll do it :
> > for (int k = 0; k < 50; ++k)
> > calculatorService.subtract(2*k+3, k);
> > It seems to work, but in a strange way.
> >
> > During the debugging i discovered your nice structure in order to invoke
> > methods over ws.
> > Mainly for the Remote SCA over Web Services your structure has the
> > following stages (correct me if i'm wrong):
> >
> > 1) JDKInvocationHandler, where you proxies the method call, create the
> > message, set the source, the target and the operation. Here still you do
> > some sort of initialization for handling callback.
> > 2) DataTrasformationInterceptor, where you create the soap body of the
> > message given the operation and parameters, for example:
> > <_ns_:add
> > xmlns:_ns_="http://calculator/xsd "><_ns_:param0>3.0
> > </_ns_:param0><_ns_:p
> > aram1>2.0</_ns_:param1></_ns_:add>
> > 3) NonblockingInterceptor, where Tuscany schedules invocation in a
> > workpool (here with jdk 1.5 , you could remove dependency from commonj
> > package)
> > 4) At time of scheduling, the next invoker is Axis2SCABindingInvoker,
> > which it's a wrapper for Axis2BindingInvoker if the invocation is
> > Request-response or for the Axis2BindingInvoker's child
> > (Axis2OneWayBindingInvoker) if the invocation is OneWay. In
> > Axis2*BindingInvoker you create the soap envelope, the Axis's
> > OperationClient, set the axis invocation options and Axis's
> > MessageContext and the you send all the stuff on the wire.
> > Just to know, Can i use the same callback between a client component and
> > k service components?
> > Cheers,
> > Jo
> >
> >
> >
> > ---------------------------------------------------------------------
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> > For additional commands, e-mail: [EMAIL PROTECTED]
> >
> > Good work Jo. It looks like there is a bug in there. Can you raise a
> Tuscany JIRA so that it can be tracked.
>
> While you're looking into some of the things you mention I'll see if I can
> create a simple itest to replicate it following your instructions. Looking
> at you mail it looks like this problem should happen any time a @OneWay
> operation is called repeatedly across the web service binding.
>
> Looking at the end of you mail, you seem to have the sequence of invokers
> right. I don't understand your question though. "Can i use the same callback
> between a client component and service components?" Is the question
> specifically about callbacks in the SCA sense or something else? This
> process of creating an invocation chains with appropriate invokers is used
> for all SCA service references.
>
> Regards
>
> Simon
>
>
> I just checked in an itest (
http://svn.apache.org/repos/asf/incubator/tuscany/java/sca/itest/oneway/)
where I have been able to reproduce the problem you are reporting. It's not
part of the main build yet as, of course, the test fails.
Simon
