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Sequence Diagram and WebService

Kumar Amit
Ranch Hand

Joined: Aug 13, 2001
Posts: 103
Hi Friends,
I need to invoke a web service from a DAO i.e. SessionBean -> DAODactory->DAO->?

Can you guide how to represent this invocation in my sequence diagram and how will I represent the web service object in the diagram e.g. Proxy.

Also, as DAO needs the endpoint URL of the webservice, What is the best way to lookup the URL instead of hardcoding it. I reckon I can't use @WSReference annotation here as DAO is not container managed.

Thanks
Amit


SCJP, SCJD, SCEA
Rajan Choudhary
Ranch Hand

Joined: Mar 17, 2011
Posts: 196
Kumar Amit wrote:Hi Friends,
I need to invoke a web service from a DAO i.e. SessionBean -> DAODactory->DAO->?

Can you guide how to represent this invocation in my sequence diagram and how will I represent the web service object in the diagram e.g. Proxy.

Also, as DAO needs the endpoint URL of the webservice, What is the best way to lookup the URL instead of hardcoding it. I reckon I can't use @WSReference annotation here as DAO is not container managed.

Thanks
Amit


URL needs to be looked up from JNDI tree.
Proxy is just like DAO or facade so show that just like other objects. You can show some info stereo type.
I have put one simple synchronous call from DAO to XYZ system(external system). Not sure, if that's the most right way of doing it but I have a feeling that we are showing more than required. We are supposed to produce high level sequence diagrams, not method parameter level just my pov...
Kumar Amit
Ranch Hand

Joined: Aug 13, 2001
Posts: 103
What about showing service locator pattern here to lookup for endpoint from JNDI?
Also, how are you showing XYZ system(external system) in the sequence diagram? Is like another other class with a name "XYZSystem"
I reckon we should show a class representing stubs generated using WSDL?
Other members can you please comment whats the best way to show this invocation?
Rajan Choudhary
Ranch Hand

Joined: Mar 17, 2011
Posts: 196
You can add UML notes, I did that.
Saurabh Deshpande
Ranch Hand

Joined: Aug 09, 2007
Posts: 33
I think you can simply mention DAO are accessed via Factory pattern in your notes. In sequence /class diagram it's not necessary to show how. Lookup or annotation is how - keep that out of class / sequence diagram. My suggestion.


Saurabh Deshpande.
SCJP, SCWCD, SCEA Part 1
Doing Part 2 now....
Sharma Ashutosh
Bartender

Joined: Apr 06, 2001
Posts: 346
You can use service locator pattern to do a lookup for SEI from JNDI. Otherwise there is no harm reading it from the properties file.
External system you can show as an entity(with some different color) on the sequence diagram and provide UML notes(dog eared boxes) regarding your convention.


Ashutosh Sharma
SCJP 1.2, SCEA 5, Brainbench certified J2EE Developer, Documentum Certified Professional
Blog : http://scea5-passingpart2and3.blogspot.com/
 
 
subject: Sequence Diagram and WebService