I'm using the BeginInvoke method of a delegate to invoke
a thread asynchronously and then use the EndInvoke to
retrieve the value. This works wonderfully until a
Serviced Component is added to the mix. When the
Serviced Component is invoked with BeginInvoke, the code
hangs for the duration of the call rather than running
async. Any ideas? Sample code below:
Private Sub Button2_Click(B yVal sender As
System.Object, ByVal e As System.EventArg s) Handles
Button2.Click
'Purpose: Submit 2 components that share the same
' module-level variables. Attempt to
show
' that COM+ can solve synchronization
problems.
Dim x1 As New myComClass
Dim x2 As New myComClass
'Prepare the first bad boy.
Dim del As TedsHandler
del = AddressOf x1.StartCountin g
Dim ar As IAsyncResult
'Prepare the second bad boy.
Dim del2 As TedsHandler
del2 = AddressOf x2.StartCountin g
Dim ar2 As IAsyncResult
'Let em run. Each BeginInvoke takes
'3 seconds (due to the lag in the component).
'I expected these to run async. Why didn't they?
ar = del.BeginInvoke (Nothing, Nothing)
ar2 = del2.BeginInvok e(Nothing, Nothing)
'Any code here will also run async.
'Wait for them both to return.
Dim l1 As Long = del.EndInvoke(a r)
Label1.Text = l1.ToString
Dim l2 As Long = del2.EndInvoke( ar2)
Label2.Text = l2.ToString
x1.Dispose()
x1 = Nothing
x2.Dispose()
x2 = Nothing
End Sub
Private Sub Button1_Click(B yVal sender As
System.Object, ByVal e As System.EventArg s) Handles
Button1.Click
'Purpose: Submit 2 components that share the same
' module-level variables. Attempt to
show
' syncronization problems.
Dim x1 As New myBadClass
Dim x2 As New myBadClass
'Prepare the first bad boy.
Dim del As TedsHandler
del = AddressOf x1.StartCountin g
Dim ar As IAsyncResult
'Prepare the second bad boy.
Dim del2 As TedsHandler
del2 = AddressOf x2.StartCountin g
Dim ar2 As IAsyncResult
'Let em run. Async works and illustrates
ar = del.BeginInvoke (Nothing, Nothing)
ar2 = del2.BeginInvok e(Nothing, Nothing)
'Any code here will also run async.
'Wait for them both to return.
Dim l1 As Long = del.EndInvoke(a r)
Label1.Text = l1.ToString
Dim l2 As Long = del2.EndInvoke( ar2)
Label2.Text = l2.ToString
x1 = Nothing
x2 = Nothing
End Sub
End Class
Public Class myBadClass
'Without EnterpriseServi ces - Works grate but has
'the sync problem with the Shared member.
Private Shared mlModuleLevelCo unter As Long = 0
Public Function StartCounting() As Long
Dim l As Long = mlModuleLevelCo unter + 1
System.Threadin g.Thread.Curren tThread.Sleep(3 000)
mlModuleLevelCo unter = l
Return l
End Function
End Class
<Synchronizatio n(Synchronizati onOption.Requir ed),
EventTrackingEn abled(True)> _
Public Class myComClass
Inherits ServicedCompone nt
Private Shared mlModuleLevelCo unter As Long = 0
Public Function StartCounting() As Long
Dim l As Long = mlModuleLevelCo unter + 1
System.Threadin g.Thread.Curren tThread.Sleep(3 000)
mlModuleLevelCo unter = l
Return l
End Function
End Class
Public Module myModule
Public Delegate Function TedsHandler() As Long
End Module 8 1996
Hi,
After calling BeginInvoke use the following code to
execute any other functionality asynchronously
While Not ar.IsCompleted
'Logic for asynchronous operation
Wend
- Gopi -----Original Message----- I'm using the BeginInvoke method of a delegate to invoke a thread asynchronously and then use the EndInvoke to retrieve the value. This works wonderfully until a Serviced Component is added to the mix. When the Serviced Component is invoked with BeginInvoke, the code hangs for the duration of the call rather than running async. Any ideas? Sample code below:
Private Sub Button2_Click(B yVal sender As System.Objec t, ByVal e As System.EventArg s) Handles Button2.Clic k
'Purpose: Submit 2 components that share the
same ' module-level variables. Attempt to show
' that COM+ can solve synchronization problems. Dim x1 As New myComClass
Dim x2 As New myComClass 'Prepare the first bad boy.
Dim del As TedsHandler
del = AddressOf x1.StartCountin g
Dim ar As IAsyncResult 'Prepare the second bad boy.
Dim del2 As TedsHandler
del2 = AddressOf x2.StartCountin g
Dim ar2 As IAsyncResult 'Let em run. Each BeginInvoke takes
'3 seconds (due to the lag in the component).
'I expected these to run async. Why didn't they?
ar = del.BeginInvoke (Nothing, Nothing)
ar2 = del2.BeginInvok e(Nothing, Nothing) 'Any code here will also run async. 'Wait for them both to return.
Dim l1 As Long = del.EndInvoke(a r)
Label1.Text = l1.ToString
Dim l2 As Long = del2.EndInvoke( ar2)
Label2.Text = l2.ToString x1.Dispose()
x1 = Nothing
x2.Dispose()
x2 = Nothing End Sub Private Sub Button1_Click(B yVal sender As System.Objec t, ByVal e As System.EventArg s) Handles Button1.Clic k 'Purpose: Submit 2 components that share the
same ' module-level variables. Attempt to show
' syncronization problems. Dim x1 As New myBadClass Dim x2 As New myBadClass
'Prepare the first bad boy. Dim del As TedsHandler del = AddressOf x1.StartCountin g Dim ar As IAsyncResult
'Prepare the second bad boy. Dim del2 As TedsHandler del2 = AddressOf x2.StartCountin g Dim ar2 As IAsyncResult
'Let em run. Async works and illustrates
ar = del.BeginInvoke (Nothing, Nothing) ar2 = del2.BeginInvok e(Nothing, Nothing)
'Any code here will also run async.
'Wait for them both to return. Dim l1 As Long = del.EndInvoke(a r) Label1.Text = l1.ToString
Dim l2 As Long = del2.EndInvoke( ar2) Label2.Text = l2.ToString
x1 = Nothing x2 = Nothing
End Sub
End Class
Public Class myBadClass
'Without EnterpriseServi ces - Works grate but has 'the sync problem with the Shared member. Private Shared mlModuleLevelCo unter As Long = 0
Public Function StartCounting() As Long
Dim l As Long = mlModuleLevelCo unter + 1
System.Threadin g.Thread.Curren tThread.Sleep(3 000)
mlModuleLevelCo unter = l
Return l
End Function
End Class
<Synchronizati on(Synchronizat ionOption.Requi red), EventTrackingE nabled(True)> _
Public Class myComClass
Inherits ServicedCompone nt
Private Shared mlModuleLevelCo unter As Long = 0
Public Function StartCounting() As Long
Dim l As Long = mlModuleLevelCo unter + 1
System.Threadin g.Thread.Curren tThread.Sleep(3 000)
mlModuleLevelCo unter = l
Return l
End Function
End Class Public Module myModule
Public Delegate Function TedsHandler() As Long
End Module
.
My problem is that the BeginInvoke does not seem to be
running async. It seems to take the amount of time I put
the thread to sleep (3 secs in this case). -----Original Message----- Hi,
After calling BeginInvoke use the following code to execute any other functionality asynchronously
While Not ar.IsCompleted 'Logic for asynchronous operation Wend
- Gopi
-----Original Message----- I'm using the BeginInvoke method of a delegate to invoke a thread asynchronously and then use the EndInvoke to retrieve the value. This works wonderfully until a Serviced Component is added to the mix. When the Serviced Component is invoked with BeginInvoke, the code hangs for the duration of the call rather than running async. Any ideas? Sample code below:
Private Sub Button2_Click(B yVal sender As System.Object , ByVal e As System.EventArg s) Handles Button2.Cli ck
'Purpose: Submit 2 components that share the same ' module-level variables. Attempt to show
' that COM+ can solve synchronization problems. Dim x1 As New myComClass
Dim x2 As New myComClass 'Prepare the first bad boy.
Dim del As TedsHandler
del = AddressOf x1.StartCountin g
Dim ar As IAsyncResult 'Prepare the second bad boy.
Dim del2 As TedsHandler
del2 = AddressOf x2.StartCountin g
Dim ar2 As IAsyncResult 'Let em run. Each BeginInvoke takes
'3 seconds (due to the lag in the component).
'I expected these to run async. Why didn't they?
ar = del.BeginInvoke (Nothing, Nothing)
ar2 = del2.BeginInvok e(Nothing, Nothing) 'Any code here will also run async. 'Wait for them both to return.
Dim l1 As Long = del.EndInvoke(a r)
Label1.Text = l1.ToString
Dim l2 As Long = del2.EndInvoke( ar2)
Label2.Text = l2.ToString x1.Dispose()
x1 = Nothing
x2.Dispose()
x2 = Nothing End Sub Private Sub Button1_Click(B yVal sender As System.Object , ByVal e As System.EventArg s) Handles Button1.Cli ck 'Purpose: Submit 2 components that share the same ' module-level variables. Attempt to show
' syncronization problems. Dim x1 As New myBadClass Dim x2 As New myBadClass
'Prepare the first bad boy. Dim del As TedsHandler del = AddressOf x1.StartCountin g Dim ar As IAsyncResult
'Prepare the second bad boy. Dim del2 As TedsHandler del2 = AddressOf x2.StartCountin g Dim ar2 As IAsyncResult
'Let em run. Async works and illustrates
ar = del.BeginInvoke (Nothing, Nothing) ar2 = del2.BeginInvok e(Nothing, Nothing)
'Any code here will also run async.
'Wait for them both to return. Dim l1 As Long = del.EndInvoke(a r) Label1.Text = l1.ToString
Dim l2 As Long = del2.EndInvoke( ar2) Label2.Text = l2.ToString
x1 = Nothing x2 = Nothing
End Sub
End Class
Public Class myBadClass
'Without EnterpriseServi ces - Works grate but has 'the sync problem with the Shared member. Private Shared mlModuleLevelCo unter As Long = 0
Public Function StartCounting() As Long
Dim l As Long = mlModuleLevelCo unter + 1
System.Threadin g.Thread.Curren tThread.Sleep(3 000)
mlModuleLevelCo unter = l
Return l
End Function
End Class
<Synchronizat ion(Synchroniza tionOption.Requ ired), EventTracking Enabled(True)> _
Public Class myComClass
Inherits ServicedCompone nt
Private Shared mlModuleLevelCo unter As Long = 0
Public Function StartCounting() As Long
Dim l As Long = mlModuleLevelCo unter + 1
System.Threadin g.Thread.Curren tThread.Sleep(3 000)
mlModuleLevelCo unter = l
Return l
End Function
End Class Public Module myModule
Public Delegate Function TedsHandler() As Long
End Module
.
.
Hi,
Thanks for your post. Do you mean that BeginInvoke does not run
asynchronously for a component? I suggest you to sleep in the component
internal processing to check whether it is execute synchronously or it just
require some overhead for the execution.
I look forward to your result.
Have a nice day! :-)
Regards,
HuangTM
Microsoft Online Partner Support
MCSE/MCSD
Get Secure! -- www.microsoft.com/security
This posting is provided "as is" with no warranties and confers no rights.
The sample that was attached in the original post
included a sleep and, yes, the amount of time that
BeginInvoke waits directly corresponds to the amount of
time the component sleeps. BeginInvoke, therefore, is
not running async. Why? -----Original Message----- Hi,
Thanks for your post. Do you mean that BeginInvoke does
not runasynchronous ly for a component? I suggest you to sleep
in the componentinternal processing to check whether it is execute
synchronously or it justrequire some overhead for the execution.
I look forward to your result.
Have a nice day! :-)
Regards,
HuangTM Microsoft Online Partner Support MCSE/MCSD
Get Secure! -- www.microsoft.com/security This posting is provided "as is" with no warranties and
confers no rights. .
Hi,
Thanks for your information. I am creating a sample project to check it on
my side, and will update you with my information.
Have a nice day!
Regards,
HuangTM
Microsoft Online Partner Support
MCSE/MCSD
Get Secure! -- www.microsoft.com/security
This posting is provided "as is" with no warranties and confers no rights.
Thanks! Any help is greatly appreciated! -----Original Message----- Hi,
Thanks for your information. I am creating a sample
project to check it onmy side, and will update you with my information.
Have a nice day!
Regards,
HuangTM Microsoft Online Partner Support MCSE/MCSD
Get Secure! -- www.microsoft.com/security This posting is provided "as is" with no warranties and
confers no rights. .
Hi,
I reproduced the problem on my side, and found that Serviced Components
does not support in process asynchronous calls. If you have an serviced
component in-proc and call its method asynchronously (through a BeginInvoke
on a delegate on the method), the BeginInvoke actually executes as a
complete call (because all custom proxies do not really have a way to
distinguish sync vs async calls).
In .NET Framwork 1.0, it throws exceptions any time we detect that an async
delegate invocation (Begin/End-Invoke) is happening on a Non-RemotingProxy.
While in .NET Framework 1.1, we now just wrap async behaviour around the
calls to BeginInvoke and EndInvoke in a non-RemotingProxy case instead of
throwing an exception.
In addition, I believe the following article is very helpful for
understanding Enterprise Services in .NET: http://www.gotdotnet.com/team/xmlentsvcs/espaper.aspx
Please feel free to let me know if you have any problems or concerns.
Have a nice day!
Regards,
HuangTM
Microsoft Online Partner Support
MCSE/MCSD
Get Secure! -- www.microsoft.com/security
This posting is provided "as is" with no warranties and confers no rights.
Thanks for the info! -----Original Message----- Hi,
I reproduced the problem on my side, and found that
Serviced Componentsdoes not support in process asynchronous calls. If you
have an servicedcomponent in-proc and call its method asynchronously
(through a BeginInvokeon a delegate on the method), the BeginInvoke actually
executes as acomplete call (because all custom proxies do not really
have a way todistinguish sync vs async calls).
In .NET Framwork 1.0, it throws exceptions any time we
detect that an asyncdelegate invocation (Begin/End-Invoke) is happening on a
Non-RemotingProxy.While in .NET Framework 1.1, we now just wrap async
behaviour around thecalls to BeginInvoke and EndInvoke in a non-
RemotingProxy case instead ofthrowing an exception.
In addition, I believe the following article is very
helpful forunderstandin g Enterprise Services in .NET: http://www.gotdotnet.com/team/xmlentsvcs/espaper.aspx
Please feel free to let me know if you have any problems
or concerns. Have a nice day!
Regards,
HuangTM Microsoft Online Partner Support MCSE/MCSD
Get Secure! -- www.microsoft.com/security This posting is provided "as is" with no warranties and
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