Multithreading As A Web Method?
Feb 3, 2010I'm working on my project, I want to ask is it possible to create multithreading in the web method at the web server side instead, not the client side.
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Dim t1 = New Thread(AddressOf TryLock)
t1.Priority = ThreadPriority.Lowest[code]...
the "dotrace" simply add a record to a log table in the db.now the right result would be that i should have the entries in the db in order "entered","exiting","exited"but actually when i look in the db i see first 2 "entered" then 2 "exiting" etc.meaning that the multithreading is working ok, but not the synclock is that correct?the real code will be adding records to the db and might be called from several pages of different sessions, but the same code must not run twice concurrently.
EDIT:in response to Sashas wonderful post i changed my code to a class (it was in a module) and now it looks like this:
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if i open multiple pages at once, they still clash some times. but if i'm correct, the issue is now not with the synclock as much as with the httpruntime.cache, because when using a standard property, on one page, the code works 100%. so how can i make sure that 2 threads, even from totally different sessions never run the trylock simultaneously?
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Aug 27, 2010i want to impliment multithreading into my web application how to do that..
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Multithreading - .net ThreadPool - Long Running Operation.
Jan 27, 2010My application is a asp.net 3.5 running on iis 6 (windows 2003)
This application is serving 1000's of users daily (100-500 users online).
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Page_Load()
{
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}
I would like to speed up the loading of this page. But at the same time make sure that it don't slow down performance of other parts of web application and also do not crash the IIS.
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OrderDTO GetDataForViewOrder(int orderID)
{
}
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Aug 10, 2010When I serve an ASP.NET page, can I render the various controls on the page in parallel?
I have a few Telerik controls (RadGrids) on the page and when I step through the page being loaded, it seems as though the controls are databound and rendered serially.
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State Management :: Session Lost When Multithreading Though ( There Is A Wait Call ! )?
Mar 9, 2011I am creating a multithreading application and I am using countdownevent to signal my object arround 3 times and using wait , but somehow the session goes null , although I am setting a breakpoint after mycountdownevent.wait() and the breakpoint isnt reached , that means the execution is not done...so can someone tell me what is wrong?? here is my code :
this is the main thread
[Code]....
this is the upload image method :
[Code]....
and this is a property for the countdown event :
public
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_3adasehCountDownEvent;
C# -.NET Multithreading & "thread Has Already Entered The Lock"
Feb 9, 2010In an ASP.NET application, I have a resource that is protected by a ReaderWriterLockSlim.
Normal requests call EnterReadLock, access the resource, call ExitReadLock and return.
At one moment, I accidently forgot to put a call to ExitReadLock somewhere in my code. On the next request, I got an exception stating that the thread had already entered the lock.
Fair enough: if at the end of request A the thread does not exit the lock, and that same thread is used to process request B, and tries to enter the lock, it will throw.
Now, my question: is the following scenario possible? reasons?
thread begins to process request A
thread enters lock
thread does, say, sleep, or do some IO, and so becomes available same thread begins to process request B, while request A is "on hold"
thread enters lock !! throws !!
If yes, what other solution do I have to protect said resource? Bearing in mind I want to use a ReaderWriterLockSlim because I also have other thread that may write to the resource?
edit: add some details: 1) This happens in the ProcessRequest method of an HttpHandler which generates, caches and serves images. These images are expensive to generate. So, the first request will generate and cache the image, and we want to put the other requests on hold while generating.
2) We have not tried to "reproduce" -- at the moment we're trying to know if it is possible or not that the same thread begins processing a request while already waiting for the image to become ready.
3) I am aware of the LockPolicyRecursion but I am not sure I fully understand its purpose, and whether it would be OK to set it to SupportsRecursion in our case.
edit: going further...According to the document pointed to by Ryan below, a thread will block and not return to the pool as long as we don't engage into async operations. So once we've locked the thread waiting for EnterReadLock to complete, it won't return to the pool nor process any other request.
So 1) we should be safe but 2) we might starve the thread pool. Assuming we don't want to immediately return a dummy "please wait" image, what solutions do we have?
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Dim entity As New Login()
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entity = accountControl.Entity
e.InputParameters.Add("entity", entity)
End Sub
And here's the markup for the datasource:
<asp:ObjectDataSource ID="MasterDataSource" runat="server" EnableCaching="true" CacheDuration="10"
SelectMethod="SelectAll" UpdateMethod="Update" TypeName="Data.DAL.LoginDAL">
</asp:ObjectDataSource>
My question is, how can I get the update method to pass this entity to the update method in my BLL class? It seems the Update method requires an ID or reference to the original object to use in determining whether any changes have taken place, but I don't really want to do this. In other words, I just want to use the Update event on my ObjectDataSource to pass my entity to the method ("Update") I set as a property and then let this business method handle the update of the data. Shown below, is the BLL update method I want to call:
Public Overloads Function Update(ByVal entity As Login)
If entity Is Nothing Then
Throw New ArgumentNullException("entity")
End If
MyBase.Update("UpdateLogin", entity.Username, entity.Password, entity.FirstName, entity.LastName, entity.Role, entity.Region, _
entity.Email, entity.Title, entity.TierID, entity.Street, entity.City, entity.State, entity.Zip, entity.Mobile, entity.Phone, entity.Fax)
End Function
When I try to call this as it stands now, I get an error: ObjectDataSource 'MasterDataSource' could not find a non-generic method 'Update' that has parameters: ID, entity. Previously, I'd set up a long list of parameters of basic data types (string, int, boolean), but this is rather cumbersome and I was hoping to use an entity for this (FYI, I also got the same type of error when I tried this approach, but with the ID as the
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[Code]....
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[Code]....