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From Ben Wyckoff <ben.wyck...@mirror-image.com>
Subject Re: AW: AW: [Axis2C] how to return a MsgBox
Date Tue, 29 Jan 2008 19:04:07 GMT
Hi,
    I'm far from a windows (or web services) expert, so I can only offer
some comments about the paradigm in general. I read this and thought of the
http basic authentication paradigm: the client makes a request to the
server, the server responds with a 401 Unauthorized response, which causes
the browser to automatically pop up a dialog box asking for credentials.
When they are supplied, the browser resubmits the request with the proper
credentials, and the server processes it.

I don't know what your client application is or at what point the web
service needs to get feedback, but the challenge/response paradigm might
work for you. You would have to return something to the client (e.g.,
javascript, an active-x reference) that triggers the MsgBox. The point is
that the requests are not nested in the authorization example, whereas the
situation you described does have the server->client request nested.

Lots of web sites use confirmation pages before completing some significant
transaction.

-Ben


> From: Mark Nüßler <mark.nuessler@9elements.com>
> Reply-To: Apache AXIS C User List <axis-c-user@ws.apache.org>
> Date: Tue, 29 Jan 2008 19:31:49 +0100
> To: Apache AXIS C User List <axis-c-user@ws.apache.org>
> Subject: Re: AW: AW: [Axis2C] how to return a MsgBox
> 
> Hello Josef,
> 
> i've read your first post, opened a reply - starting to
> write my thoughts down - deleted it, cause im not an expert ;-)
> 
> first, i think you have to write your server side callback method
> outside the service, cause the service is only active when triggerd.
> you can use axis2 api to create payload - clear.
> 
> second, if i am right, not alle mep's from wsdl are supported.
> i think you want to have "Solicit-response"/"out-in".
> 
> i do not know corba very well, but i think your former corba server
> could send the message to the client, cause the client is registerd
> and will be found over orb/naming service !? the client seems to be
> permanetly connected / has a listening port !?
> 
> 
> possible solutions i can imagine for axis2 :
> 
> 1. the client has to ask from time to time if something has happend
> on serverside. if nothing has happend on serverside, server didn't
> send back anythink or just a message like "no thanks, ask again".
> otherwise the server replys with your yes/no question, client has to answer.
> but i think this is not what you want, if you talk about a
> server side callback.
> 
> 2. when starting your client, you call a "registerWithServer" method,
> to let the server know the clients endpoint, using the servers context,
> maybe at application level ?
> write a service (not an axis service) that has a callback. when your
> conditions are met, query the context and send the question.
> now you have the problem, that the client is not listening - you have
> to run a axis service on clientside :-(
> 
> 3. client sends an async message to you server, server saves all
> informations in context to answer and quits without reply.
> i do no know what will happen ;-) maybe you have to increase client-side
> timeout ?
> write non axis service and your callback, when conditions are met, query
> the context and create payload, then answer the initial async question.
> 
> 
> cause i do not know if it is important to answer the question yes/no
> immediately, when conditions are met - maybee this is also possible :
> 
> 4. write a non axis service, when condition is met, write a flag to the
> context. when client tries to communicate (you know the user is active),
> query the context for the flag, send an special-fault as
> answer. axis-client has to interpret this fault as yes/no question,
> send the answer and service can do its work, reseting the flag in
> context. after this, the user as to resend the initial message again.
> 
> 
> mh, i don't really have an answer for you, just some thoughts and to let
> you know that you are not alone with webservice paradigm and its
> problems ;-)
> 
> mfg derMark
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> Stadelmann Josef schrieb:
>> Hi Dinesh
>> 
>> What relates to Axis2C and what not, how can a novice like I
>> know that in FULL. i.e. possible Callbacks to caling clients
>> without posting the service thread, but making it wait for the
>> answer to occure. i.e. Agent paradigm.
>> 
>> I am just seeking for an elegant method to invoke from within
>> an Axis2/C server/service something like a callback to the client
>> which askes Windows for a Windows MSGBOX with YES NO Buttons and
>> a msg and a title.
>> 
>> When the user then clicks a button, the answer is transfered
>> to the waiting server/service and the service will evaluate
>> the asnwer and can then continue.
>> 
>> 
>> I am seeking an elegant way, one of you migth know, such as how
>> to call back or agree on a clall back routin in the originating
>> Axis2/C client
>> 
>> If nobody knows that at your side of the pond, well, then I have
>> to do it the hard way by miyelf.
>> 
>> I generate a client side stub which is invoked by a server/service
>> which sends to any server/service a message
>> a title, a cpation, and some buttons or at least ID's to it.
>> 
>> The receiving service, in this case on a windows system, will then
>> invoke a Windows Operating System call and ask for a MsgBox.
>> 
>> Once the button is clicked the resulting button value
>> is then returedn as an integer to the client, which is in this
>> case the invoked web service.
>> 
>> I did so in the past using a corba server on a windows system
>> 
>> Now all what changes is CORBA to WebServices
>> 
>> And the paradigm is CLIENT -> AGENT -> question to MSG-BOX-SERVER
>> and back.
>> 
>> where Client is a web service client on a PC
>> 
>> the Agent is the axis2/c webservice server which needs to ask back
>> 
>> the Server is service hosted on the same PC as the Client resides.
>> 
>> The bas thing is that I need on each PC a web service/server for that,
>> 
>> Josef,
>> 
>> 
>> 
>> 
>> 
>> -----Ursprüngliche Nachricht-----
>> Von: Dinesh Premalal [mailto:premalal@gmail.com]Im Auftrag von Dinesh
>> Premalal
>> Gesendet: Dienstag, 29. Januar 2008 10:00
>> An: axis-c-user@ws.apache.org
>> Betreff: Re: AW: [Axis2C] how to return a MsgBox
>> 
>> 
>> Hi Josef,
>> 
>>    I'm not sure how this question relates to Axis2/C? or I didn't
>>    understand it well. If you could be more specific on your question
>>    I guess you could get some more thoughts.
>> 
>> thanks,
>> Dinesh
>> 
>> 
> 
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