WCF / ASMX :: Discarding Queued Web Service Requests?
Mar 16, 2011
If a user makes a second request to the same Web Service method while the first request is already running, is there a way to simply stop the execution of the first request and discard it immediately?
Usually what happens is users get impatient and click on a button 10 times when there's a performance blip in the system, which only makes things worse since the system now has to process 10 queued requests (the first 9 of which are now irrelevant) before any results are returned.
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Dec 9, 2010
A customer wants us to create an ajax-enabled web application that can be used to manage their IT environment (Active directory, mail, file security, ...). However, as the team that will support the web application does not know anything about these IT systems, they would like to split the coding so that all interfacing with the IT environment is done via PowerShell, which is known by the administrators of these systems. This would mean that if new functionality is required, the web team can just create an additional web page and interface and use PowerShell scripts that get created by technically skilled people in that specific topic (ie mail administrators). I don't see an issue using this approach for requests like adding a user where latency is not an issue, but I do wonder if this is feasible for interactive content with Ajax.
Ie I would like to implement a google suggest like search for AD users. This would mean that ie for every x keystrokes (or x seconds whatever approach I implement) an Ajax request will be made and the web application or web service will than use PowerShell to get the data. Taken into account that up to about 75 users can use this feature, is this something that would work? Not only performace-wise but also the number of connections (I read about the Powershell 5 remote session limit but also that it could be put to a higher number)? The example above is probably the most resource heavy Ajax requests (and can be optimized by caching), so taken into account they don't want this nice feature, are basic PowerShell scripts in ajax request really an option. My gut feeling is telling me this is a no-go, but I don't want to exclude the option just because it's not something I usually would do.
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Mar 17, 2011
I've got a WCF web service that runs fine at the moment but there is talk about using it very heavily soon. As part of it's normal process it writes a file out, then reads it back in again (don't ask why, I know it's stupid). I'm concerned that if we start hitting it with lots of requests then the following might happen.
1. Request 1 writes the file out.
2. Request 2 comes in and overwrites the file.
3. Request 1 reads the file back in but this is now the wrong file.
My understanding is that the requests would naturally queue up so that request 2 wouldn't start until request 1 had finished, but I'm not totally sure.
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Feb 15, 2011
i am using sql server inbuilt mail system for sending mail.and i made SP to call dbmail sp
now my problem is when i call sp it get executed fine but in last suppose 1000 mails queued then 1000 times i get mail queued.and that my connection time out .i extend connection time out limit but i get error msg like
"Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding. Mail queued."
my mail get queued well proper but due to 1000 or 100000 mail queued its lost of msg make problem.
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Nov 18, 2010
we are using the WCF service and hosted using a console application, now we are using LoadRunner and hitting it concurrently
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Sep 23, 2010
I am calling a web service in my aspx page. the web service (written in java) is acting as a middleware between my system and another system (Siebel) to which I send services and get response for these services. some requests are synchronous. Sometimes when invoking a method the response takes a long time to respond, so a time out exception is thrown.
The problem is that the web service is receiving the same request many times despite I am calling it only once.In my log file and database entries it is clear that the request is called only once. but in the middleware and Siebel side they are receving four or five requests for the same request sent by me.
Is this a bug in asp.net. is it possible that the server where my application is deployed is sending the request many times when not getting the response.Note: iam using Visual studion 2005. the application is deployed to windows server 2003.Iam not discussing the problem of time out. iam asking about the duplicate issue.
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Jan 20, 2011
I m invoking a web service and i would like to know if i get the raw http request?
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Nov 7, 2010
am new to web services and have a quick question. I've some data (an c# class object) that needs to be shared between two different users (of my web service) . all the methods in the web service have a parameter called "sessionkey" which can be used to know what data to share.
i need to know how/where to store this data ?
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Jan 23, 2011
I added a new asmx file, which start like this:
[Code]....
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Can I prevent access from outside my app? I only want to provide a service for signed-in users (web forms) via own webpage.
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Mar 13, 2011
I have a RESTful webservice. This webservice builds some information (which can take upwards of a couple seconds) and caches the contents.
This works well; however, suppose that many of the same requests come in at about the same time. In our current scenario, each request will build the content before caching. This is obviously not desired as it uses CPU time that could be better served elsewhere. What I would like to do is to suspend/block requests to the same url/cachekey until the content has been built and cached, at which time those other requests will be unblocked and simply fetch the content from cache.
I am not sure the best way. The following are options I have thought about:
Use string.Intern on that cache key and lock. Problem is that this could cause a deadlock if that string is used elsewhere. Use a ConcurrentDictionary and WaitHandle objects to allow other request to lookup in the dictionary if a request is being processed and then "wait" for the request to finish. This would at least give me a timeout capability but I am concerned with the performance of creating many wait handles.
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May 7, 2010
How do I capture the outgoing and incoming soap requests using VS 2008? I read about the SOAP toolkit but it seems the framework now does it? Is it in the Windows SDK?I am debugging a web service on FedEx and they want to see the the SOAP file.
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Mar 23, 2010
I have a few web servers behind an Amazon EC2 load balancer. I'm using TCP balancing on port 80 (rather than HTTP balancing). I have a client polling a Web Service (running on all web servers) for new items every few seconds. However, the client seems to stay connected to one server and polls that same server each time. I've tried using ServicePointManager to disable KeepAlive, but that didn't change anything. The outgoing connection still had its "connection: keep-alive" HTTP header, and the server kept the TCP connection open. I've also tried adding an override of GetWebRequest to the proxy class created by VS, which inherits from SoapHttpClientProtocol, but I still see the keep-alive header.
If I kill the client's process and restart, it'll connect to a new server via the load balancer, but it'll continue polling that new server forever. Is there a way to force it to connect to a random server each time? I want the load from the one client to be spread across all of the web servers. The client is written in C# (as is the server) and uses a Web Reference (not a Service Reference), which points to the load balancer.
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Mar 31, 2011
I have a piece of code written in 2 different ways, one a web service and another a WCF client which are trying to access an external 3rd party URL.
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I installed Fiddler to check traffic and to my surprise the web code works when Fiddler is capturing traffic, As soon as I stop Fiddler my code does not work.
For the web service code I get error: The remote name could not be resolved:
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May 5, 2010
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Nov 8, 2010
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[Code]....
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[Code]....
[Code]....
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How do I add the WCF service built using VS2010 as a service reference to a Winforms app which is written in VB6?
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