Paul Robinson updated JBTM-986:
Priority: Minor (was: Major)
Automatically setup the client side handler chain
Project: JBoss Transaction Manager
Issue Type: Feature Request
Security Level: Public(Everyone can see)
Reporter: Paul Robinson
Assignee: Paul Robinson
Fix For: 5.0.0.M2
When invoking a WS-AT or WS-BA Web service, the client side handler has to be added to
the client stub to manage transaction context propagation. The code required to do this is
BindingProvider bindingProvider = (BindingProvider) client;
List<Handler> handlers = new ArrayList<Handler>(1);
This is not very user friendly.
h2. Using WS-Policy
If the Service WSDL specifies a WS-Policy assertion, we know that WS-AT or WS-BA is
required/supported and we should be able to setup this handler chain automatically.
Another benefit is that we can catch, on the client side, the situation where no WS-AT or
WS-BA transaction context is present. Currently we leave it up to the service to detect
and as a result we have no control over how this fault will be propagated back to the
client. For example, a WrongStateException could be thrown when the service tries to
enlist a participant and a transaction is not present. The Client may receive a generic
fault message back or, in this case some or all of the WrongStateException. In either
case, the developer of the Client is unlikely to realise that this is due to there not
being a transaction present when the service was invoked. If the service mandates a WS-AT
or WS-BA transaction, but none is present, then the client handler throws a suitable
exception explaining what went wrong. If the service supports (i.e. it is optional) a
WS-AT or WS-BA transaction, then the interceptor ignores the situation where non exists.
CXF seems to have a plugin point for adding WS-Policy assertion handlers. This could be
the right integration point for this feature. This is to be investigated.
h2. Without WS-Policy
It could be possible to inject a WS client stub and annotate the injection point such
that the middleware knows to setup the handler chain. I'm not sure what support
already exists for injecting WS client stubs. This needs to be investigated first.
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