Design Question - Reusable WebService Client with UI

Hi,
How to design, and package a web service client so that it would be a reusable ADF component?
Recently, I have been working on a web service client. I have used a Java proxy and exposed this java proxy as a data control, and have used this (drag & drop) on a jsf fragment page.
However, there might be a strong situation where other teams on this program would be using it, instead of they reinventing the wheel, I was thinking they could reuse this.
Having said that, and searching this forum, I am not sure to package, or what additional things to to so that it is cleaner to expose this component for reuse.
Any direction is greatly appreciated.
Thank you,
VJ

Hi,
create a bounded task flow that contains UI in a page fragment (for this you need to create the bounded task flow to use page fragments, which is a setting when creating task flows). The package the whole bounded task flow in an ADF library (create a new deployment profile --> ADF library). This then packages the data control and the UI.
http://download.oracle.com/docs/cd/E17904_01/web.1111/b31974/reusing_components.htm#BEIGHHCG
Frank

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Hey ,
I have an application which requires to talk to 2 different published webservices
from 2 different systems. Now instead od designing static webservice clients for
each of these systems(which would involve having separate proxy jars etc),
I am planning to design a dynamic webservice locator and invoker....
I know that we can have webservice clients which are dynamic to the extent that
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KRISH.VENKATARAMAN
Senior Technology Analyst
Bank of America Corp.
Email:[email protected]

Hi Krish,
In WSDL, the data types passed between applications are described in schema
and
this is key for interop. I dont know of any standard/natural mapping for
values types,
object reference, etc in a binary protocol (like JRMP, IIOP) to schema. For
eg:
say there is serializable object Foo, which is the argument to a remote
method in RMI.
Object Foo can have data + behavior. It may be possible (not always, i
think) to
describe the data in Foo as schema, but how can one describe the behavior?
So, if WSDL is the only contract between the server and client (key
requirement
for interop), then IMHO RMI can not be described by WSDL.
Also, WSDL was designed for future extensions and does not map well to a
programming API. WSIF trys to expose all the gory WSDL details and its apis
are very clumsy.
These were the two main reason to vote it down at JAX-RPC EC.
I am attaching an example that shows, how to introspect WSDL and invoke
a method using JAX-RPC (with little extension to the std api). Also, it
shows
how to handle complex type without data binding. Will this solve your
problem?
I am very interested to get your feedback on this.
BTW, This example will only work with WLS 8.1.
regards,
-manoj
"Krish Venkataraman" <[email protected]> wrote in message
news:[email protected]...
>
>
Mike...thanx for the inputs...
As per ur suggestion...I have taken this offline and mailed u [email protected]
also....lemme know if thatz cool...
there are my observations..lemme know what am i missing..
1) The main difference I see between JAX-RPC and WSIF, is that with WSIFclient
it is easier to port to services talking
via other ports like RMI,IIOP etc...where as JAX-RPC is understandsonly SOAP(atleast
for now).
2) Lets assume for the time-being that I would be interested only to talkto services
talking SOAP.
Then why do I need WSIF ?
3) I can have a JX-RPC client , I can have a similar generic(reflection)code
for built-in/primitive datatypes and for
complex datatypes I anywayz would be doing the same thing(requiringthe java
representation of the datatype unless I use
something like JROM or something which I do not want to) in JAX-RPC orWSIF.
>
4) As far as syncronous or asyncronous invocation is concerned , myunderstanding
is that my client call is going to remain the
same ..the service provider is going to either use message-oriented orRPC
on his side...
Again assuming that I am interested only with services talking SOAP, thiscould
be my generic client invocation design
Background is that my client is going to run from within a WLS70sp1
Actors:
a) webSevice1ClientSessionBean : This will be a stateless session beanwhich might
have knowledge about webSevice1's end-point ,
complex dataTypes if any.
(There would be other session beans like this which would haveknowledge about
other specific webservice)
b) GenericWebServiceInvoker : This will have knowledge about everythingwithin
the webservice-standards/protocols.
eg:
//set weblogic ServiceFactory
System.setProperty( "javax.xml.rpc.ServiceFactory",
"weblogic.webservice.core.rpc.ServiceFactoryImpl" );
//create service factory
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//define qnames
String targetNamespace = "http://soapinterop.org/";
QName serviceName = new QName( targetNamespace, "SimpleTest" );
QName portName = new QName( targetNamespace, "SimpleTestSoap" );
QName operationName = new QName( "http://soapinterop.org/",
"echoStruct" );
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Service service = factory.createService( serviceName );
TypeMappingRegistry registry = service.getTypeMappingRegistry();
TypeMapping mapping = registry.getTypeMapping(
SOAPConstants.URI_NS_SOAP_ENCODING );
mapping.register( SOAPElement.class,
new QName( "http://soapinterop.org/xsd", "SOAPStruct" ),
new SOAPElementCodec(),
new SOAPElementCodec() );
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Call call = service.createCall();
//set port and operation name
call.setPortTypeName( portName );
call.setOperationName( operationName );
call.addParameter( "inputStruct",
new QName( "http://soapinterop.org/xsd", "SOAPStruct" ),
ParameterMode.IN);
All parameter values specific to a particular webservice likeQName,targetNameSpace
etc will be sent to this invoker by
webSevice1ClientSessionBean. The GenericWebServiceInvoker will invokethe
service
(using reflection for primitive/builtin types) and alwayz accept anobject
from the service operation and just return
that "object" back the webSevice1ClientSessionBean.ThewebSevice1ClientSessionBean
will know how to interpret the
complexdataType or builtInDatatype whichever is returned.TheGenericWebServiceInvoker
will not have any application
specific knowledge...it will just have knowledge about how todiscover, invoke
any SOAP webservice...
Somewhere in the beginning of GenericWebServiceInvoker I will use JAXRto
discover services from UDDI if needed.
This way I will have a generic webservice client invocation frameworkwhich
can invoke any service which talks SOAP.
Now lemme know how the above picture looks and what is missing...
I have some questions :
1) Incase of complex dataTypes, I will have itz XML representation inthe
publisher's WSDL and the publisher will give
me the java representation of the complex dataType.But how does myclient
JAX-RPC know how to map the XML
to the java representation unless I specify the mapping somewhere?Does
the TypeMapping/TypeMappingRegistry do this ?
Thanx,
Krish
"Michael Wooten" <[email protected]> wrote:
You know, it's really cool to hear guys thinking things through, before
they "jump
on a bandwagon" :-)
Anyway, I suspect that the performance overhead of doing reflection,
and heavy
server-side code intrusion, is what has made a lot of developers balk
at using
WSIF. I would check out the IBM newsgroups, to see what the general
developer
sentiment is on WSIF.
To achieve any sort of decent performance with JAX-RPC based webservices,
you
need to do a fair amount of optimization/tuning on both the client and
server
side. I recommend setting up your own "lab environment" for doing these,
so you
can see exactly what's making things improve/degrade. If you are really
interested
in this topic, we should talk about it "off-line".
In general, the more "dynamic" things are on the client side, the slower
things
will be, the more you really need to question if you really need them
to be dynamic
:-) Does making it "dynamic" really offer something that you can't get
from a
"static" version? If not, who's really benefiting here. I mean, com'n.
All you
really want to do is invoke an operation, right? By the time you get
all the information
it takes to do a dynamic invocation (i.e. port, target namespace, data
type for
input argument, serializer/deserializer for each non-built-in data type,
etc.),
your client looks like you are trying to boot a PDP-11! LOL! For those
of you
who don't know what a PDP-11 is, it's an early computer (from the'60-'70),
that
you actually had to use switches to create the "binary instructions"
to boot it
up!
From a PM's (product manager's) perpective, I wouldn't even let thedevelopers
modify "working" EJBs to expose them as a web service. Alarm bells should
go off
in your head, if you have to modify existing server-side code to expose
a company
asset as a web service.
Response to OT comment: WebLogic Server 7.0 uses its own implementation
of JAX-RPC
1.0. This implementation, I've been told by one of the BEA engineering
that worked
on it, has been certified to be JAX-RPC compliant by Sun. Don't know
about Apache
Axis, in this regard. I use both Apache Axis and the JWSDP with WLS 6.1,
but I
haven't really spent a lot of time looking for differences between our
(BEA's)
implementation, and theirs.
Regards,
Mike Wooten
"Krish Venkataraman" <[email protected]> wrote:
Hey Mike ...
I hear ya..and I see the significance of WSIF...but that IBM started
it a year
back and itz not yet stabilized is what is holding me back...
U mite have a better hold of what WSIF can do...whatever I could grasp
from yesterday
is this...
a)It reads meta data from the wsdl and using a reflection mechanismcalls
the
service operations...
I see examples with primitive datatypes..but what happens when
complex/custom
datatypes come into play...
Would the client code differ between synchronous invocation toasynchronous
invocation...
And aleast in the samples for the WSIF distribution for connectors like
EJB/JMS
etc, the code does not look generic anymore..there are specific calls
to operations
and parameters...
Also Mike , what is the trade-off on performance between having adynamic
client(lets
say based on WSIF)or having a static client...the extent of reflection
a dynamic
client will have to do and create SAAJ objects at runtime will beenormous..
Also I know that there is a relevant API...but can u give an examleshowing
me
how I could discover services from UDDI ..?
Out of this current topic...does BEA use itz own implementation of SOAP
in itz
webservice implementation...and how does it compare with AXIS ?
Thanx,
Krish
"Michael Wooten" <[email protected]> wrote:
Hi Krish,
Well, I guess that's how things are when "needed functionality exceeds
the current
state of a technology" :-)
I (not necessarily BEA) look at it like way:
1. IBM co-authored the "Big 3" XML grammars for the current web
services
stack.
2. IBM always appears to be "there, somewhere" in the new crop ofproposed
additional
XML grammars for "partially agreed upon extension layers", for theweb
services
stack.
3. IBM donated it's original SOAP implementation to the open-sourcecommunity.
4. IBM came up with WSIF over a year ago.
5. IBM's WSTK uses the Apache Axis stuff.
6. A lot of the JAX-RPC/JAXM API is based on the Apache SOAP and Apache
Axis implementations.
7. It looks like IBM may have donated WSIF to Axis.
8. You appear to need something like WSIF :-)
So, there's probably at least a 60/40 chance that some WSIF-like thing
will make
it into the JWSDP, right? If you want "higher odds", you should talk
to the folks
working on the JWSDP, as they are somewhat "in charge" here :-)
Regards,
Mike Wooten
"Krish Venkataraman" <[email protected]> wrote:
Yes...I am surely lookin at something similar...but that framework
not
being standardized
scares me as I have seen many good ideas not seeing the light of the
day...and
I do not want to design something using a framework which might remain
un-standardized..
what are ur thots..
Thanx,
Krish
"Michael Wooten" <[email protected]> wrote:
Hi Krish,
It sounds like you want WSIF :-)
"WSIF allows stubless or completely dynamic invocation of a Web
service,
>>>>>>
based upon examination of the meta-data about the service at runtime.
It
also allows updated implementations of a binding to be plugged intoWSIF
at
runtime, and it allows the calling service to defer choosing a
binding
until
runtime."
Correct?
This is a relatively new "unofficial" addition to the Web ServicesStack,
so it
is not in WLS 7.0 (or Sun's JWSDP) yet. See the following link formore
details:
http://xml.apache.org/axis/wsif
Regards,
Mike Wooten
"Krish Venkataraman" <[email protected]> wrote:
Hey ,
I have an application which requires to talk to 2 different
published
webservices
from 2 different systems. Now instead od designing static webservice
clients for
each of these systems(which would involve having separate proxyjars
etc),
I am planning to design a dynamic webservice locator and invoker....
I know that we can have webservice clients which are dynamic tothe
extent
that
we can create proxy objects at runtime once we know the endpoint
WSDL..
eg:
ServiceFactory factory = ServiceFactory.newInstance();
QName serviceName =new QName
targetNamespace,"net.xmethods.services.stockquote.StockQuoteService");
>>>>>>>
QName portName = newQName(targetNamespace,"net.xmethods.services.stockquote.StockQuotePort");
>>>>>>>
QName operationName = newQName("urn:xmethods-delayed-quotes","getQuote");
>>>>>>>
URL wsdlLocation = newURL("http://services.xmethods.net/soap/urn:xmethods-delayed-quotes.wsdl");
>>>>>>>
// create service
Service service = factory.createService(wsdlLocation, serviceName);
// create call Call call = service.createCall(portName,
operationName);
>>>>>>>
>>>>>>>
My question on this...if I have a dynamic approach like the abovewhat
are the
pros and cons..I guess it would surely have more overhead comparedto
a static
client...?
Secondly ,is it even feasible to design a dynamic client in such
a
way
that the
endpoint WSDL could also be an unknown and my generic client wouldalso
locate
the end-point dynamically and then invoke dynamic calls as above...
If anybody can share their insights on a dynamic webservice client
I would really
appreciate it...
Thanx,
Krish
KRISH.VENKATARAMAN
Senior Technology Analyst
Bank of America Corp.
Email:[email protected]
[BrowserClient.java]
[DynamicClient.java]

SCCM Questions about offline clients

All,
I wanted to provide some background on a project we are working on and provide some questions that hopefully someone can help answer.
First I wanted to make note that as part of the requirements for this project we are going to have SCCM clients deployed at various locations offsite from our primary SCCM server and these SCCM clients will have only intermittent network connectivity back
to our primary SCCM server. During the times that these clients are lacking connectivity we will need the ability to do multiple manual hardware inventories of the clients with the expectation that once connectivity is resumed, ALL of the inventories taken
will report back to the primary SCCM server. Additionally, during the time that network connectivity is lacking we will need to be able to run SCCM reports regarding these clients local to the clients themselves (IE at the offsite location which won't have
network access to the primary SCCM server.)
Our proposed solution to these requirements was that we planned to provide the offsite location with a SCCM secondary site. The idea being that while network connectivity to the primary server was down the clients would continue to report their inventory
data to the secondary site and reports could still be run from the secondary site as well. Once network connectivity was resumed the secondary site would synchronize with the primary site and provide the primary site with all the missing hardware inventories.
I have since done further research and believe there are some flaws with this solution:
I am reading that secondary sites do not actually store inventory data in a local database like primary sites do.
I am reading that the “reporting services point” is not available on secondary sites, thus limiting our ability to run reports while network connectivity to the primary site is down.
With this I have a few questions:
How many inventories does the client save locally to the machine? Does it save all inventories triggered since the last communication with the server, or does it only save and transmit the last inventory that was collected prior to network communication
being restored?
If it only transmits the last inventory collected, does the idea of having a secondary site work for storing the multiple inventories that we need to collect while network connectivity to the primary server is lacking, or is it true that secondary sites
do not store inventories in a local database?
Finally, if secondary sites DO save inventories locally, but we are NOT able to install the “reporting services point,” will we be able to get around not being able to run the default SCCM reports by instead running custom SQL reports directly from the
SQL Server installed on the secondary site?
Thank you for your time,
Ryan

Well, this is kind of a complicated project and I am not going to lie I know we are asking to use SCCM in a way that it was not designed to be used.
Basically these clients are training machines that will be reconfigured potentially several times a day. Essentially when a program runs that reconfigures the machine it will trigger a hardware inventory. Custom information about the configuration will be
saved in custom WMI classes that we have created which will be inventoried by SCCM. We need the ability for if the customer says "I had a problem at 9am" for us to have them run a report that tells us which configuration was in place at 9am.
Because of this requirement there may be multiple hardware inventories taken in a single day.
Most of these devices will go MANY months between having networking connectivity back to our primary site. To be honest though some of these devices will be at locations in which they may need to be managed for 15-20 years without EVER having network connectivity
back to the primary site. The idea for these cases was that the secondary site located with the clients would store the inventories and at regular intervals we will have a SQL expert manually export the SQL data to a CD from the secondary site and re-import
it to the primary site. This is how the primary site will get updated without ever having network connectivity to the secondary site.
For all of this to work it is essential that the secondary site store the inventories in a local database. I am just not clear if that is how this works or not. It is also essential we can run reports for the secondary site. I am a little more clear that
the "reporting services point" is not installable on the secondary site; however, my thought is the machine still has SQL installed and if it stores the hardware inventories locally we may still be able to use custom SSRS reports to extract the data.

Method design question...and passing object as parameter to webserice

I am new to webservice...one design question
i am writing a webservice to check whether a user is valid user or not. The users are categorized as Member, Admin and Professional. For each user type I have to hit different data source to verify.
I can get this user type as parameter. What is the best approach to define the method?
Having one single method �isValidUser � and all the client web service can always call this method and provide user type or should I define method for each type like isValidMember, isValidAdmin ?
One more thing...in future the requirement may change for professional to have more required field in that case the parameter need to have more attribute. But on client side not much change if I have a single isValidUser method...all they have to do is pass additional values
isValidUser(String username, String usertype, String[] userAttributes){
if usertype == member
call member code
else if usertype = professional
call professional code
else if usertype = admin
call admin code
else
throw error
or
isValidMember(String username, String[] userAttributes){
call member code
One last question, can the parameter be passed as object in web service like USER object.

First of all, here is my code
CREATE OR REPLACE
TYPE USERCONTEXT AS OBJECT
user_login varchar2,
user_id integer,
CONSTRUCTOR FUNCTION USERCONTEXT (
P_LOGIN IN INTEGER
P_ID_ID IN INTEGER
) RETURN SELF AS RESULT
Either your type wont be compiled or this is not the real code..

Webservices client

Hi,
I have deployed webservice which is running on Weblogic server. For that I have to write a webservices client in VC++, for my java webservice the arguments are String and Complex type and return type is Complex type.
Can any body tell me how to write webservice client in C++ or VC++ using VC++ compiler.
Earliest response with sample code Appreciated.
Thanks in advance,

A web service client written on WLS [1], should work with
service hosted by any vendor, including .Net, AXIS, Sun RI,
etc.
The client code you write in WLS which is based on JAX-RPC [1]
should compile as is on other vendor JAX-RPC implementation.
So, if you are looking for client code portability then JAX-RPC
is your best bet.
Regards,
-manoj
[1] http://edocs.bea.com/wls/docs81/webserv/client.html#1069703
[2] http://java.sun.com/xml/jaxrpc/
"hanks" <[email protected]> wrote in message
news:3ea3392d$[email protected]..
>
I have tried webservices with apache and weblogic7.0 but i realised thatboth was
to be done very specific to servers.I may be wrong. I am trying tounderstand
how can i write a sercive for one server and access using another server.
When i write webservice in java tomcat server, I create a service andregister
as urn name. For a client to access this service, code kind of looks ejbcode
where we lookup the service and call its method. Instead of looking upJNDI name
we lookup urn and access method. Mind you this client uses ORG packagesspecific
to tomcat.
Now when we write a websercice with weblogic we have to create a ear whichhas
webserverice and write a client to access that service, which lookscompletely
diffrent from one that we wrote for tomcat. I am wondering how can i usethe same
client to access both the services. It rarely happens that both side wouldbe
using same servers.
I am sure that there is some mistake i m doing cos webservices is supposeto be
even language independent.
Can you guys help me in resolving this, more questions later ;-)

Design Question - Reusable WebService Client with UI

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