Web service life cycle...

[Kyle Lomeli <ky...@deitel.net>]

Where can I find information concerning the lifecycle of a service deployed
on Axis?

Does Axis use only one instance of each Web service, or does it create
multiple instances of a Web service to handle multiple requests?

Any synchronization issues of which I must be aware? Thank you in advance.



*******************************************************
 Kyle Lomelí
 Software Developer
 Deitel & Associates, Inc.
 www.deitel.com

 Register now for the DEITEL BUZZ e-mail newsletter at
 http://www.deitel.net/newsletter/subscribe.html
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Re: Web service life cycle...

[Andrew Vardeman <an...@iastate.edu>]

Kyle,

see the thread "threads, etc. in application scoped service" from Tuesday, 
May 7 -- essentially, if you deploy your webservice without a "scope" 
parameter in the .wsdd file, it's request-scoped and one instance is made 
for each request.  If you deploy it with session scope, one object is made 
for each session (sessions are tracked via HTTP cookies or SOAP header 
elements, depending on your configuration).  If you deploy it with 
application scope, there is only one instance for all requests.  Each 
request gets its own thread, so you could have multiple threads 
simultaneously calling methods on the same session- or application-scoped 
service.  So if your service has member fields that are modified by the 
methods you expose, you have possible threading problems and need to worry 
about synchronization.

Andrew

At 10:20 AM 5/16/2002 -0400, you wrote:
>Where can I find information concerning the lifecycle of a service deployed
>on Axis?
>
>Does Axis use only one instance of each Web service, or does it create
>multiple instances of a Web service to handle multiple requests?
>
>Any synchronization issues of which I must be aware? Thank you in advance.
>
>
>
>*******************************************************
>  Kyle Lomelí
>  Software Developer
>  Deitel & Associates, Inc.
>  www.deitel.com
>
>  Register now for the DEITEL BUZZ e-mail newsletter at
>  http://www.deitel.net/newsletter/subscribe.html
>*******************************************************