Re: [Axis2] Architecture: Asynchronous Web services with Axis1 and Axis2 -

[Suran Jayathilaka <su...@wso2.com>]

william wallace wrote:
> Hi,
>
> So far, we have used Axis1 to create a number of Web services in my 
> project. We see it works well with the request-response message 
> pattern. Only one issue is that we could not have Asynchronous Web 
> services. Instead, we have had to use Socket programming for those 
> asynchronous in nature. (the client maintains a server Socket, after 
> responding, the Web service has to initialize a client socket 
> connecting to the client side program,...). The key shortcoming of 
> this approach is that the socket connection must be maintained for a 
> time even no data transfer in the case of event notification (the Web 
> service informs back to the client side about an event happened).
>
> Now I just switch to Axis2 and find that it supports the Non-blocking 
> invocation and I can use it for those Asynchronous Web services. The 
> first thing I notice is, in Axis2, there is no difference in client 
> (consumer) and Web service side.
>
> I would like to know how the Call Back mechanism has been implemented.
>
> - if HTTP is the transport, is there an http server in the client side 
> opening to wait for the call-back message from Web service ? if not, 
> what is really happening ?
>
> - if TCP is the transport, can I say that a server Socket is opened in 
> the client side ? any long-running  connection between the client and 
> Web services ?
>
>
> Anyone has knowledge in this issue, please advise me. I do appreciate it.
>
> Thanks in advance
>
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Hi William,

I believe this podcast/article should tell you a bit about asynchronous 
web services invocations in Axis2.

http://wso2.org/library/2774

Cheers!
Suran

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