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From Glen Mazza <glen.ma...@verizon.net>
Subject Hainan? (Was RE: [Review] Implement JSR-311 in CXF)
Date Sat, 08 Sep 2007 00:15:29 GMT
BTW, I think since Sun's JAX-RS representation is named after an island,
it might be a neat idea if CXF did the same.

Regards,
Glen


Am Freitag, den 07.09.2007, 03:13 -0400 schrieb Liu, Jervis:
> Hi Glen, 
> 
> Thanks for the input. We probably need to dig into CXF architectures and APIs deeper
in order to understand what can be shared between “Web service CXF” and “REST CXF”.
 BTW I would use the phrase Web service CXF instead of SOAP CXF as CXF offered much more than
just SOAP. Below are some initial thoughts on what CXF APIs can be reused by JAX-RS:
> 
> 1.Reuse CXF front end APIs in JAX-RS: This looks good in my experimental implementation.
Using following code snippet to start a service should appear familiar to any CXF users. Also
it’s easy to integrate with Spring in this way.
> 
>         JAXRSServerFactoryBean sf = new JAXRSServerFactoryBean();
>         sf.setResourceClasses(BookStore.class);
>         sf.setBindingId(JAXRSBindingFactory.JAXRS_BINDING_ID);
>         sf.setAddress("  <http://localhost:9080/xml/> http://localhost:9080/xml/");
>         sf.create();  
> 
> Whether or not JAXRSServerFactoryBean/JAXRSServiceFactoryBean are extended from some
common CXF frontend base classes is a matter of implementation details.
> 
> 2.Reuse CXF DataBinding API in JAX-RS: Ideally we would like to reuse CXF DataBindings
in JAX-RS, such as JAXB, Aegis (as well as the XMLBean and JBIX that hopefully will come out
soon). Take our JAXB data binding implementation as an example, we did extend Sun’s JAXB
to some extent in order to handle some cases that JAXB can not handle properly, such as Array,
List and hexBinary. Reusing JAXB data binding in JAX-RS definitely sounds a saving on both
sides.  However, I haven’t figured out how to do this yet. The CXF data binding is WSDL-centric,
it depends on the schema info from the service model to do the marshal/unmarshal. We could
though, in JAX-RS, build up schema info from resource classes, then feed schema info into
data bindings. Internally in JAX-RS EntityProvider we can make calls to databinding to do
the read/write.
> 
> 3.Reuse CXF Binding: I don’t find any concepts in JSR-311 that are equivalent to CXF
Binding. I would say we wont need Binding stuff in JAX-RS.
> 
> Jervis
> 
> 
> > -----Original Message-----
> > From: Glen Mazza [ mailto:glen.mazza@verizon.net]
> > Sent: 2007年9月7日 12:55
> > To: cxf-dev@incubator.apache.org
> > Subject: Re: [Review] Implement JSR-311 in CXF
> >
> >
> > The folks over at Sun have kept Jersey[1] separate from
> > Metro--they have
> > different codebases.  This allows both Jersey and Metro to be tightly
> > fitting to the respective specifications they need to implement. 
> >
> > Indeed, my past experience on Apache FOP is that the closer
> > you keep the
> > coding to the specification, the more developers you will
> > attract to the
> > project--always a good thing.
> >
> > So my feeling is that it would be good for REST CXF to be
> > coded from the
> > beginning, as if SOAP CXF did not exist, *but* for any commonality
> > between SOAP CXF and REST CXF to be factored out and shared
> > between the
> > two systems--perhaps in a commons project.  Just my $0.02.
> >
> > Regards,
> > Glen
> >
> > [1] https://jersey.dev.java.net/source/browse/jersey/
> >
> >
> > Am Donnerstag, den 06.09.2007, 23:15 -0400 schrieb Liu, Jervis:
> > > Hi, I recently spent some time on implementing JSR-311 (JAX-RS: Java
> > > API for RESTful Web Services [1]) in CXF. The prototype code can be
> > > checked out from branch
> > >
> > https://svn.apache.org/repos/asf/incubator/cxf/branches/jliu. As this
> > > is still in a prototype phase, please don’t mind uncleared
> > warnings,
> > > funny hacked methods etc. Any comments or feedbacks will be highly
> > > appreciated.
> > >
> > > When I first started looking into the implementation, I
> > actually have
> > > three different design choices:
> > >
> > > The first approach is to implement JAX-RS in CXF similar to Jersey
> > > [2], using the JAX-WS Provider API as a proxy to direct request from
> > > CXF runtime to JAX-RS runtime. This might be the least intrusive
> > > approach as from the CXF runtime’s point of view, the
> > JAX-RS runtime
> > > is really just an application sitting on top of CXF. On the other
> > > hand, less intrusion means less control. Taking this approach, for
> > > example, the only information CXF runtime knows about the JAX-RS
> > > service is that it has a method exposed as invoke(T). This may gives
> > > us difficulties later on when we bring in management capabilities or
> > > introduce a service description language like WADL. Another
> > problem is
> > > a potential performance penalty. Depends on the specific JAX-WS
> > > implementation, there is always an extra time spent on transforming
> > > input stream to the T in the Provider.invoke(T).
> > >
> > > The second and the third approach are both implementing
> > JAX-RS in CXF
> > > core. What distinguished them from each other is whether or not to
> > > implement JAX-RS based on existing CXF API models. The CXF
> > API models
> > > I referred to are frontend APIs such as
> > > serviceFactoryBean/serverFactoryBean/Endpoint/EndpointInfo, Binding
> > > APIs, DataBinding APIs, Transport APIs and service model etc. As I
> > > mentioned early, the major problem with these CXF APIs is they are
> > > very WSDL-centric. To get around this, we can either
> > refactor CXF APIs
> > > so that at least the top abstract layer is suitable for both
> > > WSDL-based services and non-WSDL-based services. Or we can
> > start off a
> > > new set of APIs for non-WSDL-based services and built JAX-RS
> > > implementation on top of them.  My prototype implementation
> > takes the
> > > former approach, can be briefed as below:
> > >
> > > 1. Refactored CXF APIs, so that AbstractServiceFactoryBean and
> > > AbstractEndpointFactory become the base classes that are neutral to
> > > both WSDL-based services and non-WSDL-based services. Also refactor
> > > Service interface so that it can represent both WSDL
> > service model and
> > > non-WSDL service model. The service model for JAX-RS is
> > pretty simple,
> > > it consists of resource classes and each resource class
> > consists of a
> > > set of resource methods.
> > >
> > > 2. JAXRSServiceFactoryBean extended from AbstractServiceFactoryBean,
> > > is responsible for the creation of service model, data binding etc.
> > >
> > > 3. JAXRSServerFactoryBean extended from AbstractEndpointFactory, is
> > > responsible for creating EndpointInfo, Endpoint, BindingFactory,
> > > ServerImpl etc.
> > >
> > > 4. Start a JAX-RS service would look very similar to Simple
> > or JAX-WS
> > > frontend:
> > >
> > >         JAXRSServerFactoryBean sf = new JAXRSServerFactoryBean();
> > >         sf.setResourceClasses(BookStore.class);
> > >         sf.setBindingId(JAXRSBindingFactory.JAXRS_BINDING_ID);
> > >         sf.setAddress(" http://localhost:9080/xml/");
> > >
> > >         sf.create();  
> > >
> > > I have created a simple bookstore sample, which is located under
> > > \systests\src\test\java\org\apache\cxf\systest\jaxrs. At the moment,
> > > the JAX-RS implementation does not support sub-resource
> > locators yet,
> > > thus this service can only serve services for the following URLs:
> > >
> > > http://localhost:9080/xml/bookstore  return all books
> > > http://localhost:9080/xml/bookstore/123  return book 123
> > >
> > >
> > > [1]. JSR-311 Spec: https://jsr311.dev.java.net/
> > > [2]. Jersey: https://jersey.dev.java.net/
> > >
> > > Cheers,
> > > Jervis
> > > 
> > >
> > >
> > >
> > > ----------------------------
> > > IONA Technologies PLC (registered in Ireland)
> > > Registered Number: 171387
> > > Registered Address: The IONA Building, Shelbourne Road,
> > Dublin 4, Ireland
> > 
> 
> 
> ----------------------------
> IONA Technologies PLC (registered in Ireland)
> Registered Number: 171387
> Registered Address: The IONA Building, Shelbourne Road, Dublin 4, Ireland


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