Design Pattern For Web Services.

I tried asking siomilar questions in WebService Forum but didn'y got any replies.
Can anybody tell me what should be the Design for Web Services.
I have understanding that there can be just 1 Interface/Implementation class for each Web Service, and which will have 1 end point.So for evry such Interface we will have to have 1 Web Service.
Can someone please clarify wheather I'm correct or not ?
I guess that If my application has many Interfaces and I have to expose the application as Web Service.Then I will have to expose all methods from one Interface and then expose this new Interface as Web Service.
Is this how WS will work.
Any pointers to design PATTERNS for Web Service will be highly appreciated.
Thanks
Rahul

I don't know if anyone has documented new patterns specifically aimed at web services but the old ones definitely apply. Like you were alluding to, there is a letter-envelope decoupling of interface and implementation with the XML WSDL interface and coded implementation.

Similar Messages

What is the design pattern for web application with struts & hibernate?

Hi everyone,
I am new to web application developement.I am using struts for MVC framework & Hibernate for ORM framework.I am little confused that struts used bean representation for collecting form fields(Bean 1),value objects(DTO) for passing value to the JSP(Bean 2) & hibernate use the bean like representation for persistent object(Bean 3).Whether we must use all the bean's which are similar to each other or any reusable bean recommended?

I'm sure why it didn't work. That is how I bundle the JRE. The only disadvantage about bundling is the size of the installer file will be pretty large. In my opinion, relying on a public version is not a good idea if you have no control of the target box. The user might, for some reason, decide to uninstall java or upgrade to a new incompatible version and your app. may stop working. I'm sure many on here will disagree with this though.
I always use the marner .exe wrapper:
http://www.megaupload.com/?d=FYZAVM77
and inno installer:
http://www.jrsoftware.org/isinfo.php
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http://sourceforge.net/project/showfiles.php?group_id=234356

(261936172) Q general Are there seperate logs for web services?

Q<general> Are there seperate logs for web services?
A<general> It does not appear that there are any separate logs for web services.
There is knex.log file that records the errors that occur during deployment of
your .jws files. There is also the standard server log that provides information
about server status - you can write to this programmatically if you wish. There
is also the access.log file which record all the HTTP requests so this might cover
some of your web service requests that are transmitted over HTTP.

Maybe the user has deniad Access to the Runbook, check in Runbook Designer.
Seidl Michael | http://www.techguy.at |
twitter.com/techguyat | facebook.com/techguyat

Flex design pattern for BlazeDS transfer objects

Dear Community,
I have a question regarding the nature of objects transferd from BlazeDS backend to the Flex client.
According to some adobe docs all the presentation logic should be in flex and BlazeDS should provide only services.
The question is what kind of transfer objects should be used? with what level of abstraction?
To make it more clear let's talk about a simple forum application like adobe forums.
I have created a Forum service, which returns a Forum transfer object, which has a List of Threads, with each thread having a List of Messages.
Flex gets the Forum transfer object and does all the presentaiton work.
This is a very nice seperatin of concerns architecture BUT there are two major performance issues:
- when the forum becomes bigger the transfer object will be huge
- the flex will use huge client resources to create the presentation of the forum transfer object.
So my question is what is your strategy/ design pattern for such a problem.
An obvious answer would be create services that include the presentation logic and use transfor objects like ThreadListPage which will include only the first 10 threads.
Thanks in advance

I think you are going to get a few varied types of answers to a general question like this, but I will comment on a few things. First, you should only be transmitting the data that you need to use or display to the user at the time. If this forum was implemented in Flex (I wish) you wouldn't transfer the text for all the threads. You might not transfer the thread text at all (just the subjects), you'd make calls back to the server to fetch that data when and if you need it.
Also, I think you are overestimating the resources required for the Flex "presentation layer". If you think about it, these workstations we have here are pretty idle most of the time when you're at a website. Nowadays there's plenty of processing power just sitting there waiting, so as long as your design isn't flawed the CPU or memory are rarely going to be a bottleneck with Flex.
The way I design, BlazeDS (or GraniteDS etc) should mostly just be "serving data". There is some flexibility available, for example I don't see a problem with putting certain types of business rules (such as a limit on the number of results that can be recieved in a search) within server side code, and validation rules on the Flex side. So there's not too many "industry standards" in Flex yet beyond maybe what's done in the various standard architectures, at least not that I'm aware of.
You might find it beneficial to look into some of the various frameworks/architectures available like Cairngorm, Mate, Swiz, and so on. Learning how they work (looking at examples) would probably answer some of your questions too.

Re: Why doesn't WL7.0 support get/post bindings for web services ...

hi!!!
Could you pls point to any code example.
thanks
Pushpa
"Richard Berger" <[email protected]> wrote:
>
Manoj: Thanks for the answer - do you have or can you point me at any
code samples
that accomplish this? (Yes, .NET is limited to strings/ints in their
get/post
bindings).
Thanks so much!
RB
PS - Also, can you explain any apparent discrepancy between your answer
and what
the WL documentation stated (again, it may be my misunderstanding).
"manoj cheenath" <[email protected]> wrote:
WL 7.0 does allow you to access the web service through
the browser. It even allows you to invoke service methods
with complex type arguments (.Net only supports primitive
types) and also to view the request and response soap
message for the invocation.
regards,
-manoj
"Richard Berger" <[email protected]> wrote in message
news:[email protected]...
This might be a naive question, but according to the documentation,WL 7.0
does
not support http post/get bindings for web services. Thus, for meto
access a
web service, I need to write a "middle tier" of some sort (I used
the
automatically
generated Java proxy code and JSP). All works fine, but it seems
like
it
would
sure be nice to have HTML forms access web services without havingto
write a
middle tier.
NET does this and it is extremely useful - is there a reason that
BEA
chose not
to provide this feature? (e.g. is it architecturally unsound in anyway?
or is
there an easy way to simulate it?). Given some of the Web Workshoppositioning
re: ease of use and .NET comparison, this seems like an omission.
Any insights are greatly appreciated.
Enjoy,
RB
PS - Here's the info from the documentation
Web Services Description Language (WSDL) 1.1 Specification
WSDL is an XML-based language that describes Web services. WSDL definesWeb services
as a set of endpoints operating on messages; these message containeither
message-style
or RPC-style information. The operations and messages are describedabstractly
in WSDL, and then bound to a concrete network protocol and messageformat
to define
an endpoint. Related concrete endpoints are combined into abstractendpoints (services).
WSDL is extensible to allow the description of endpoints and theirassociated
messages regardless of what message formats or network protocols areused
to communicate,
however, the only bindings described in the specification describehow to
use
WSDL in conjunction with SOAP 1.1, HTTP GET/POST, and MIME.
Note: WebLogic Server supports only SOAP 1.1 bindings.
The WSDL 1.1 Specification is available at http://www.w3.org/TR/wsdl.

This isn't a straight FORM Post as in the http binding support in WSDL. It posts
a soap message.
It's apparent that Workshop supports form-post and form-get.
But I dont see how it is done with straight WebLogic webservices. Does WebLogic
server read the web-services.xml or the WSDL file? I dont see a way to put in
http-post binding in the former and in the latter it seems to be ignored.
Can someone clarify.
Thanks.
Chu-chi
"manoj cheenath" <[email protected]> wrote:
Here is a live example:
http://65.193.192.35:7001/base/SoapInteropBaseService
Here is an example that you can download:
http://manojc.com/?sample2
This is how you run it:
http://manojc.com/?tutorial/doc/howtorun.html
More info can be found from the edocs:
7.0:
http://edocs.bea.com/wls/docs70/webserv/index.html
8.1:
http://edocs.bea.com/wls/docs81/webserv/index.html
Regards,
-manoj
http://manojc.com
"pushpa krishna" <[email protected]> wrote in message
news:[email protected]...
hi!!!
Could you pls point to any code example.
thanks
Pushpa
"Richard Berger" <[email protected]> wrote:
Manoj: Thanks for the answer - do you have or can you point me at
any
code samples
that accomplish this? (Yes, .NET is limited to strings/ints in their
get/post
bindings).
Thanks so much!
RB
PS - Also, can you explain any apparent discrepancy between your answer
and what
the WL documentation stated (again, it may be my misunderstanding).
"manoj cheenath" <[email protected]> wrote:
WL 7.0 does allow you to access the web service through
the browser. It even allows you to invoke service methods
with complex type arguments (.Net only supports primitive
types) and also to view the request and response soap
message for the invocation.
regards,
-manoj
"Richard Berger" <[email protected]> wrote in message
news:[email protected]...
This might be a naive question, but according to the documentation,WL 7.0
does
not support http post/get bindings for web services. Thus, for
me
to
access a
web service, I need to write a "middle tier" of some sort (I used
the
automatically
generated Java proxy code and JSP). All works fine, but it seems
like
it
would
sure be nice to have HTML forms access web services without havingto
write a
middle tier.
NET does this and it is extremely useful - is there a reason that
BEA
chose not
to provide this feature? (e.g. is it architecturally unsound in
any
way?
or is
there an easy way to simulate it?). Given some of the Web Workshoppositioning
re: ease of use and .NET comparison, this seems like an omission.
Any insights are greatly appreciated.
Enjoy,
RB
PS - Here's the info from the documentation
Web Services Description Language (WSDL) 1.1 Specification
WSDL is an XML-based language that describes Web services. WSDL
defines
Web services
as a set of endpoints operating on messages; these message containeither
message-style
or RPC-style information. The operations and messages are describedabstractly
in WSDL, and then bound to a concrete network protocol and messageformat
to define
an endpoint. Related concrete endpoints are combined into abstractendpoints (services).
WSDL is extensible to allow the description of endpoints and theirassociated
messages regardless of what message formats or network protocols
are
used
to communicate,
however, the only bindings described in the specification describehow to
use
WSDL in conjunction with SOAP 1.1, HTTP GET/POST, and MIME.
Note: WebLogic Server supports only SOAP 1.1 bindings.
The WSDL 1.1 Specification is available at http://www.w3.org/TR/wsdl.

Why doesn't WL7.0 support get/post bindings for web services ...

This might be a naive question, but according to the documentation, WL 7.0 does
not support http post/get bindings for web services. Thus, for me to access a
web service, I need to write a "middle tier" of some sort (I used the automatically
generated Java proxy code and JSP). All works fine, but it seems like it would
sure be nice to have HTML forms access web services without having to write a
middle tier.
.NET does this and it is extremely useful - is there a reason that BEA chose not
to provide this feature? (e.g. is it architecturally unsound in any way? or is
there an easy way to simulate it?). Given some of the Web Workshop positioning
re: ease of use and .NET comparison, this seems like an omission.
Any insights are greatly appreciated.
Enjoy,
RB
PS - Here's the info from the documentation
Web Services Description Language (WSDL) 1.1 Specification
WSDL is an XML-based language that describes Web services. WSDL defines Web services
as a set of endpoints operating on messages; these message contain either message-style
or RPC-style information. The operations and messages are described abstractly
in WSDL, and then bound to a concrete network protocol and message format to define
an endpoint. Related concrete endpoints are combined into abstract endpoints (services).
WSDL is extensible to allow the description of endpoints and their associated
messages regardless of what message formats or network protocols are used to communicate,
however, the only bindings described in the specification describe how to use
WSDL in conjunction with SOAP 1.1, HTTP GET/POST, and MIME.
Note: WebLogic Server supports only SOAP 1.1 bindings.
The WSDL 1.1 Specification is available at http://www.w3.org/TR/wsdl.

Manoj: Thanks for the answer - do you have or can you point me at any code samples
that accomplish this? (Yes, .NET is limited to strings/ints in their get/post
bindings).
Thanks so much!
RB
PS - Also, can you explain any apparent discrepancy between your answer and what
the WL documentation stated (again, it may be my misunderstanding).
"manoj cheenath" <[email protected]> wrote:
WL 7.0 does allow you to access the web service through
the browser. It even allows you to invoke service methods
with complex type arguments (.Net only supports primitive
types) and also to view the request and response soap
message for the invocation.
regards,
-manoj
"Richard Berger" <[email protected]> wrote in message
news:[email protected]...
This might be a naive question, but according to the documentation,WL 7.0
does
not support http post/get bindings for web services. Thus, for meto
access a
web service, I need to write a "middle tier" of some sort (I used theautomatically
generated Java proxy code and JSP). All works fine, but it seems likeit
would
sure be nice to have HTML forms access web services without havingto
write a
middle tier.
NET does this and it is extremely useful - is there a reason that BEAchose not
to provide this feature? (e.g. is it architecturally unsound in anyway?
or is
there an easy way to simulate it?). Given some of the Web Workshoppositioning
re: ease of use and .NET comparison, this seems like an omission.
Any insights are greatly appreciated.
Enjoy,
RB
PS - Here's the info from the documentation
Web Services Description Language (WSDL) 1.1 Specification
WSDL is an XML-based language that describes Web services. WSDL definesWeb services
as a set of endpoints operating on messages; these message containeither
message-style
or RPC-style information. The operations and messages are describedabstractly
in WSDL, and then bound to a concrete network protocol and messageformat
to define
an endpoint. Related concrete endpoints are combined into abstractendpoints (services).
WSDL is extensible to allow the description of endpoints and theirassociated
messages regardless of what message formats or network protocols areused
to communicate,
however, the only bindings described in the specification describehow to
use
WSDL in conjunction with SOAP 1.1, HTTP GET/POST, and MIME.
Note: WebLogic Server supports only SOAP 1.1 bindings.
The WSDL 1.1 Specification is available at http://www.w3.org/TR/wsdl.

What is the best design pattern for this problem?

No code to go with the question. I am trying to settle on the best design pattern for the problem before I code. I want to use an Object Oriented approach.
I have included a basic UML diagram of what I was thinking so far.
Stated simply, I have three devices; Module, Wired Modem, and Wireless Modem.
In the Device Under Test parent class, I have put the attributes that are variable from device to device, but common to all of them.
In the child classes, I have put the attributes that are not variable to each copy of that device. The attributes are common across device types. I was planning to use controls in the class definition that have the data set to a default value, since it doesn't change for each serial number of that device. For example, a Module will always have a Device Type ID of 1. These values are used to query the database.
An example query would be [DHR].[GetDeviceActiveVersions] '39288', 1, '4/26/2012 12:18:52 PM'
The '1' is the device type ID, the 39288 is the serial number, and the return would be "A000" or "S002", for example.
So, I would be pulling the Serial Number and Device Type ID from the Device Under Test parent and child, and passing them to the Database using a SQL string stored in the control of the Active Versions child class of Database.
The overall idea is that the same data is used to send multiple queries to the database and receiving back various data that I then evaluate for pass of fail, and for date order.
What I can't settle on is the approach. Should it be a Strategy pattern, A Chain of Command pattern, a Decorator pattern or something else.
Ideas?

elrathia wrote:
Hi Ben,
I haven't much idea of how override works and when you would use it and why. I'm the newest of the new here.
Good. At least you will not be smaking with a OPPer dOOPer hammer if I make some gramatical mistake.
You may want to look at this thread in the BreakPoint where i trie to help Cory get a handle on Dynamic Dispatching with an example of two classes that inherit from a common parent and invoke Over-ride VIs to do the same thing but with wildly varying results.
The example uses a Class of "Numeric" and a sibling class "Text" and the both implement an Add method.
It is dirt simple and Cory did a decent job of explaining it.
It just be the motivation you are looking for.
have fun!
Ben
Ben Rayner
I am currently active on.. MainStream Preppers
Rayner's Ridge is under construction

WSDL error during generation of ABAP proxy for web service

Hi friends,
I am getting error during the generation of ABAP proxy object for web service developed in .NET .
Error : Proxy generation terminated: WSDL error (<extension> not supported).
How to make this WSDL file compatible for ABAP proxy.
I have tried to edit WSDL file in XML Spy but did not get any option to replace/remove the tag <extention>.
If any one worked on this. Please help me its urgent.
Thanks and regards,
Shivanand.

HI ,
I am having the same issue!!!
Does ABAP Proxy Generation support <extension> ?
Is there a list available of what is supported and what not (please consider I do not have access to sap notes)?
Thanks

Choice of design pattern for data acquisition system

Hello all
I have a trouble about selecting the suitable design pattern / architecture for a data acquisition system.
Here is the details of the desired system:
There is data acquisition hardware and I need to use it by observing parameters on User interface.
the data acquisiton period, channel list to scan should be chosen on User interface. Besides, there are many user interface interactions. e.g. if user selects a channel to add scanlist, then I need to enable and make visible some other parts on user interface.
When user completes the channel selection, then he will press the button to start data acquisition. Then I also need to show the scanned values on a graph in real time and log them in txt file.
I know that I cannot use producer consumer pattern here. because the data acquisition loop should wait for parameters to scan channels. and it works in a given period by user. so the user interface loop performs higher rate then consumer loop (data acquisition loop). it means queue will be bigger bigger. if I use notifier it will loss some data come from user interface.
is there any idea about that ? is there any suitable design pattern for this case ?
Thanks in advance
best regards
Veli BAYAR
Embedded Systems Software and Hardware Engineer
"You live in a graphical world. Why not program in one?"
Solved!
Go to Solution.

johnsold wrote:
Veli,
I recommend the Producer/Consumer model with some modifications.
You might need three loops. I cannot tell for sure from your brief description.
The User Interface loop responds to the user inputs for configuration and start/stop of acquisition. The parameters and commands are passed to the Data Acquisition loop via a queue. In this loop is a state machine which has Idle, Configuration, Acquisition, and Shutdown states (and perhaps others). The data is sent to the Processing loop via a different queue. The Processing loop performs any data processing, displays the data to the user, and saves it to file. A notifier can be used to send the Stop or shutdown command from the User Interface loop to the other loops. If the amount of processing is minimal and the file write times are not too long, the Processing loop functions might be able to occur in the Timeout case of the UI loop Event structure. This simplifies things somewhat but is not as flexible when changes need to be made.
I am not sure that a Design Pattern for this exact setup exists but it is basically a combination of the Producer/Consumer (Events) and Producer/Consumer (Data) Design Patterns.
Lynn
Check out this thread: http://forums.ni.com/t5/LabVIEW/Multiple-poll-case-structures-to-event-help/td-p/2551309
There are discussions there about a 3-loop architecture that may help you.
Jeff
Jeffrey Zola

Best book for Web Services

Can you suggest me what's best book for Web Services and XML to study? I'm planning to buy..
Thanks in advance..

Why does it need to be the best one? What would that even mean? Just buy something reputable, like an O'Reilly book, it's not going to be so horrifically poor that you can't learn from it

How to activate trace for web services

Hi Experts,
How to activate trace for web services in SOAMANAGER.
We are not able to view the Payload trace of the error logs.
Can anyone please let me know how to go about this???
Regards,
Ashwini

Hi Ashwini,
The thread below might be useful to you:
[SOAMANAGER - Get the XML generated;
Regards, Trevor

Building client proxies for web services with SOAP attachemtns

Hi all.
I'm currently building a series of web services that take SOAP attachments as
input, but I am unable to generate the java proxies for testing the services via
WebLogic Workshop 8.1. When I attempt to build the proxy, I get the following
error:
Warning: Failed to generate client proxy from WSDL definition for this service.
Suggestion: Please verify the <types> section of the WSDL.
Is there something I need to alter to get this to work, or does workshop not support
client proxies for web services with DataHandler parameters?
Thanks.
-Brian

Thanks for the help. This is my first web service with SOAP attachments, so it
may have been a long time till I realized that.
-Brian
"Michael Wooten" <[email protected]> wrote:
>
Thanks Brian,
The problem is that you are trying to use the "document" soap-style :-)
If you change this to "rpc", you'll should be able to successfully generate
the
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property sheet section, for the JWS.
Regards,
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"Brian McLoughlin" <[email protected]> wrote:
Sure, sorry about that. Attached is the wsdl for a sample web service
I created
just to test the proxy generation.
"Michael Wooten" <[email protected]> wrote:
Hi Brian,
Would it be possible for you to post the WSDL, so we can see what might
be causing
the problem?
Regards,
Mike Wooten
"Brian McLoughlin" <[email protected]> wrote:
Hi all.
I'm currently building a series of web services that take SOAP attachments
as
input, but I am unable to generate the java proxies for testing theservices
via
WebLogic Workshop 8.1. When I attempt to build the proxy, I get the
following
error:
Warning: Failed to generate client proxy from WSDL definition for
this
service.
Suggestion: Please verify the <types> section of the WSDL.
Is there something I need to alter to get this to work, or does workshop
not support
client proxies for web services with DataHandler parameters?
Thanks.
-Brian

Stub for web service in JSP

How do i embed a scriptlet inside my JSP page for the stub of my web service? is there any examples that i can refer to?
Thanks in advance. ;)

Check out the 2 How To:
9.0.4 / 10.1.2 "How to use OC4J JSP Tags for Web Services" [1].
10.1.3 (preview) "Access J2EE 1.4 JAX-RPC Java Web Services from Web Clients" [2].
Hope this helps,
Eric
[1] http://www.oracle.com/technology/sample_code/tech/java/codesnippet/webservices/wstags/index.html
[2] http://www.oracle.com/technology/products/jdev/101/howtos/jaxrpc/java14_ws_web_clients.html

About XML Parameter for Web Service invoking

I would like to use the XML parameter as the Web Service's input(Attachment is
the XML schema) in WebLogic Server 8 sp1. When I generated the Web Service and
use the WebLogic Server generate test web page to test it, I got Exception. The
WebLogic Server can't constructe the input XML.
The correct XML should look like this:
<ids>
<desc>Description</desc>
<id>1</id>
<id>2</id>
<id>3</id>
</ids>
Is there any one can tell me whether this kind of XML was permitted for Web Service
invoking or not?
[sample.xsd]

Hi Andy,
On the test page, before the invoke of the operation, did it say
something like:

if so, the service itself may be working OK, the deficiency is that the
test page tries its best to determine sample values for the invoke,
however it does not know in this case.
Did you try with a client?
Your XML should be fine.
Regards,
Bruce
Andy wrote:
>
I would like to use the XML parameter as the Web Service's input(Attachment is
the XML schema) in WebLogic Server 8 sp1. When I generated the Web Service and
use the WebLogic Server generate test web page to test it, I got Exception. The
WebLogic Server can't constructe the input XML.
The correct XML should look like this:
<ids>
<desc>Description</desc>
<id>1</id>
<id>2</id>
<id>3</id>
</ids>
Is there any one can tell me whether this kind of XML was permitted for Web Service
invoking or not?
Name: sample.xsd
sample.xsd Type: ACT Project (text/xml)
Encoding: base64

Invalid Content Type Error for Web Service

Hi Experts,
We have a XI / PI Web Service, and have created an Adaptive Web Service Model for the same. For using this web service model, we have created a HTTP destination of type WSDL.
This configuration works great in our development and consolidation server.
While working with our production server, with all the settings same as consolidation server, the following error is generated for Web Service call. using the AWS model
java.io.IOException: Invalid content type while requesting http://<host>:<port>/webdynpro/resources/<application_package>/guicall.wsdl. Expected Content-type: text/xml, received Content-type: content/unknown, used user to connect: null
The HTTP destination address is the one specified in bold above.
Also, in later part of the stack trace we are bale to see this error:
com.sap.tc.webdynpro.model.webservice.exception.WSModelRuntimeException: Exception on creation of service metadata for WS metadata destination
Please guide us on this issue.
Best Regards,
Alka.

Hi Alka,
How did you configure the Webservice Destinations in Visual Admin for a webservice explosed by XI system.
I mean what was the URL specified, did you specify XI SYSTEM userid password ???
How was the webservice published to inspection.wsil in XI system ??
Thanks,
Regards,
Aditya Metukul

Design Pattern For Web Services.

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