Architecture :: Handling Asynchronous Server To Server Interface?
Mar 11, 2010
So this interface allows one server to request data from another server. The catch is that all xml for the interface is transmitted entirely over http posts followed by an empty status code 200 response. No data is sent in a response. So if my application wants to requests data, we send an http post with the xml request and receive a blank 200. Then, shortly after our request, we'll receive an http post to a predetermined URL with the xml data which we then send a blank 200. This data will then be stored in a SQL database. This interface cannot be altered.
The reason this is problematic is because our server is handling requests from clients that need that data in the response. If a user requests for data that isn't available in our database, it needs to be requested from the interface and then returned in the response. I'm just not sure how to get this to work out. I've thought about polling the database, but I'm worried about thread pool issues. I've also looked into using ManualResetEvent.WaitOne to halt the processing of the client request and then calling Set when the interface sends the data (as a request). I've read that wait threads are shared, but just don't know if this will scale well. Does anyone have any insight or I'm pretty much stumped on this one...
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Jul 30, 2010
I am working on 3 tier architecture: UI, BL, DAL. In my UI i have following code for Asynchronous page processing:
[Code]....
But I want a database fetch operation to be performed in this asyncronous method. And due to 3 tier arch. i am unable to do this in UI Layer. Can anyone guide me that how can I implement Asynchronous processing in 3 tier architecture? Note: If you are going to place EndAsyncWork1 in DAL then show that how can I return a value back to UI layer from this function.
[Code]....
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Dec 14, 2010
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Feb 3, 2011
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Oct 7, 2010
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Mar 12, 2010
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Oct 24, 2010
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Jul 19, 2010
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Jan 11, 2010
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Jan 27, 2011
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namespace ServiceDemo
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[WebService(Namespace = "http://tempuri.org/")]
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[System.ComponentModel.ToolboxItem(false)]
[System.Web.Script.Services.ScriptService]
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{
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Oct 16, 2010
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or
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Apr 9, 2010
ASP.NET Ajax Library provides some client-side events. For instance:
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function(args) {
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Feb 26, 2011
A first chance exception of type 'System.Threading.ThreadAbortException' occurred in mscorlib.dll An exception of type 'System.Threading.ThreadAbortException' occurred in mscorlib.dll but was not handled in user code
After banging my head because i could find where the exception came for and global.asax didn't get hit i found that it's from server.transfer and is a known bug. The alternative i read about is server.execute.However if i do this then the next page fires multiple javascript exceptions and a gridview i have is breaking of and the rows appear half at the left page corner and half inside the gridview!!
For now i just put a try catch on the server.transfer although the exception will not affect the application even if i don't use try catch. I also see that the exception is happening again even if i put try catch but with different dll: A first chance exception of type 'System.Threading.ThreadAbortException' occurred in App_Web_benglxq1.dll An exception of type 'System.Threading.ThreadAbortException' occurred in App_Web_benglxq1.dll but was not handled in user code Now what on earth is benglxq1.dll i don't know. What i know is that i'm leaving an exception to run and i don't like that. This is the js error when i use server.transfer btw: Microsoft JScript runtime error: Sys.ArgumentTypeException: Object of type 'Sys._Application' cannot be converted to type 'Sys._Application'.
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May 28, 2010
I'm wondering what's the preferred way to manage exceptions in an MVP implemented with a Passive View.
There's a discussion in my company about putting try/catch blocks in the presenter or only in the view.
In my opinion the logical top level caller is the presenter (even if the actual one is the view).
Moreover I can test the presenter and not the view. This is the reason why I prefer to define a method in the view interface:
[Code]....
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Mar 17, 2011
I want to handle asynchronous post back timeout error (Sys.WebForms.PageRequestManagerTimeoutException) on server side.
I use AsyncPostBackError event of ScriptManager class for other errors (exceptions) during asynchronous post back and it works fine. There is a response redirect to generic error page in this event handler.
Unfortunately for PageRequestManagerTimeoutException this event is not fired.
So how can I handle this error on server side?
scriptMgr.AsyncPostBackTimeout = 180;scriptMgr.AsyncPostBackError += new EventHandler<AsyncPostBackErrorEventArgs>(scriptMgr_AsyncPostBackError);...private void scriptMgr_AsyncPostBackError(object sender, AsyncPostBackErrorEventArgs e){Response.Redirect("~/System/GenericError.aspx");}
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Oct 16, 2010
How to wire up HTML server controls events?
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Jun 3, 2010
I devide my website on 3 layers :
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BLL(Business Logic) -
cache data and in try/catch block call function from DAL and throw it to UI :
try
{
}
catch (Exception ex)
{
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throw ex
}
UI (User Interface) - simple working without handling any exception,
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Jul 17, 2010
I will try to explain my doubt and keep the code out, maybe for a second post. The greatest problem i am facing here is the logic :P.
At this point i have two tables: Empregado (Worker) and Cargo (Post). One post have many workers and one worker has only one post. In the database i think i am fine, a simple relationship one - many.
I've mapped the tables into classes with the same fields. As well i've created collections using generic lists. Each collection has a method that acess the bank and recover the data.
My worker class agregates one instance of post. I mainly use this to show the data i need. Basicaly i do a select, join the tables and fill the properties of the worker and the post.
The doubt: Is this a good pattern? Up to this moment i am not worried with blinding light performance, but in how to act in an good OOP pattern.
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Apr 3, 2010
one is anchor tag and other asp linkbutton tag
we want to call user defined function on onclick of anchor tag and as well as linkbutton
is it possible?
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Jun 24, 2010
I am creating a webform in which I am having two radio buttons (Yes/No), one textbox, and two lables.
I want to enable and disable the textbox on radio button click Yes and No respectively.
I want to use custom server control for this whole process as we have to use this DLL in other application also.
Being as beginner I got just confused about event handling methods for server controls.
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Feb 17, 2011
Handling large number of images downloaded from server
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Aug 26, 2010
I have a ListView that contains a large collection of rows with textboxes that users can optionally fill out. These textboxes are not databound. When the user clicks "next" i need to iterate over the rows and determine which fields the user has filled out, and then update a sort of "cart" with the data and move to a confirmation page ("you have selected a, g, v, zz, is this correct?" sort of thing).
I can think of two ways to deal with this. The first is, server side, to walk the items in the listview, get the control ID's, save this data to a list, then save it to a database cart table for the next screen to read.I can use jquery to collect all the values client side, then pass it back to the form in a hidden field and use something like Newton.Json to get the data into a similar list.What are the tradoffs of these two approaches?
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Feb 16, 2011
While using an insert query for a certain table, can I used a select statement to know whether there's an already existing value in the stored procedure using a return value where insert occurs? Or do I need to separate a procedure?
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Feb 10, 2010
I'm using a ModalPopupExtender in my website, to show "accept/cancel" messages, and catch the user selection at the server side. I put two buttons (ok/cancel) at the panel that will be shown as a modal popup, add them a server side event handler, but it does not fire.
[Code]....
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Mar 18, 2010
I need the user to be able to upload multiple files to my server, thus I am using the SWFUpload utility. SWFUpload sends the files one by one, and I need to store them all in the same temporary directory. My ASP.NET handler recieves the files one by one and I can store the file appropriately.
My problem is: How do I know which files belong to the same upload? Rephrased, how do I connect the files in my handler?
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