Tbanks Deepal for your informative response. Now I feel confident on
how to write my 'application' scoped web service (ie, taking care to be
threadsafe).
Deepal jayasinghe wrote:
Jonathan Joseph wrote:
I have a couple of questions regarding Axis2 web services configured
to run with service scope set to 'Application':
1) Is the web service a singleton?
yes
2) Is the web service thread-safe?
yes and no
I think that the answers are 1) Yes, 2) No. I couldn't find an
explicit answer in the Axis2 documentation.
Once you deploy a service in application scope we create only one
instance of the service implementation class. And we store the
instance in the ServiceContext. So each and every request coming to
that service uses the same service instance. However in web service
world we have to write our services in a stateless manner , meaning
write the class so that we do not store any class level variable in
the service impl class. Then the service invocation would become
thread safe as well.
Thank you!
Deepal
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