OneWay operation WebService (JAX-WS)

[Leonardo Carreira]

Hi Friends..

How to implement OneWay operation WebService?..
just use @OneWay and use void method?.. //is it enough?
What case that forced us to develop OneWay operation WebService?..

Thanks in advance..

[Ivan Krizsan]

Hi!
Yes, annotating a method with the @OneWay annotation is enough if you do Java-first development.
If you are doing WSDL-first development, then (assuming WSDL 1.1) you must not have <output> element(s) or <fault> elements in the <operation> element in question in the <portType> element. The example below has two operations, only the second is a one-way operation.

<wsdl:portType name="SpaceWarGame"> 
    <wsdl:operation name="getResultSheet"> 
        <wsdl:input message="tns:getResultSheetRequest" />  
        <wsdl:output message="tns:getResultSheetResponse" /> 
        <wsdl:fault name="fault" message="tns:getResultSheet_faultMsg"/> 
    </wsdl:operation> 
    <wsdl:operation name="submitCommandSheet"> 
        <wsdl:input message="tns:submitCommandSheetRequest"/>
    </wsdl:operation> 
</wsdl:portType> 

Oneway operations are useful, for instance, if a client wants to send a message to a web service but is not interested in waiting for a response, for instance with asynchronous operations that may take a long time to finish. The response may later be delivered using callback or the client may poll for the result.
Best wishes!

[Leonardo Carreira]

Hi Ivan, thanks for your reply..

Oh i see.. i guessed before that the OneWay operation in WebService doesn't need to have return value..

The response may later be delivered using callback or the client may poll for the result.

do we have to make callback handler (in the client side)?..
how about if we implement only use common asynchronous call (through Polling)?...
doesn't it matter?..

sorry Ivan, i'm still not understand about this mean : "the client may poll for the result"..

Thanks in advance..

[C Shinde]

Read Dispatch API and Response API.
And also read the PDF created by Ivar, page number 163 for 'Asynchronous Request-Response'.

Regards,
Chetan

[Leonardo Carreira]

Ok... Thanks C Shinde for your reply..
it helps me for get more clarification about OneWay operation..