[Axis2][proposal for Core of Axis2]Proposal for Dialog

[Srinath Perera]

Hi All;

I have update the toy "proposal for Core of Axis2". Since the new
changes add a new approch handling the conversation of message I
thought of posting it to the DEv list for comments.

The Proposal introduces new concepts called Dialogs to capture the
concepts of a conversation. Each SOAPEndpoint (formally a Web Service)
should associate itself with a dialog. What SOAPEndpoint does is to
hand over the Message in to a Dialog. The Dialogs can be exsits in
scopes, Global, Session and Service. The Dialog can be exists
independent of the Services and the same dialog can be shared by more
than one SOAPEndpoint. This follows the notation of more than one
people talking in a conversation.
Receipt of each Message will add one more message in to the dialog.
The dialogs can be longs or short, in the sense a dialog can expect a
one message in fact making it one-way or it do something like
accepting 100 messages and sending 200 messages.  Axis2 implementation
will provide Dialogs for the each well defined message exchange
pattern. But Dialogs may be taking the form of N in M out.


 

Dialogs are extending to Endpoint Dialogs to register with the
SOAPEndpoint, which are initiated by receiving a SOAPMessage. But the
dialogs that initiate with sending a SOAP message may take the any
form as the user is one who executes them. Axis2 will provide inbuilt
dialogs of both natures.

To capture the concepts in Axis1.x like providers, the Dialogs are
extensible in the following way.
<dialog name="abc" class="pqr">
        <xxx class="x1"/>
            <yyy class="x2"/>
</dialog>

Here the Dialog has a name and an implementation class. It may have
zero or more child elements with any name and one attribute called
class. The implementation class should have an attribute and getters
and setters for each element name. Each class attribute should point
to a Java class that is available in the classpath and have a default
constructer.
e.g
public class pqr{
           private x1 xxx; 
        private x2 yyy;
}

Using this method the InOutSyncDialog that uses a provider is shown as follows.

<service name ="echo" dialog=" InOutSyncDialog"/>

<dialog name=" InOutSyncDialog">
           <provider class="provider-class"/>
</dialog>

Thanks
Srinath