How do I subscribe to a MSMQ queue but only "peek" the message in .Net?
- by lemkepf
We have a MSMQ Queue setup that receives messages and is processed by an application. We'd like to have another process subscribe to the Queue and just read the message and log it's contents.
I have this in place already, the problem is it's constantly peeking the queue. CPU on the server when this is running is around 40%. The mqsvc.exe runs at 30% and this app runs at 10%. I'd rather have something that just waits for a message to come in, get's notified of it, and then logs it without constantly pooling the server.
Dim lastid As String
Dim objQueue As MessageQueue
Dim strQueueName As String
Public Sub Main()
objQueue = New MessageQueue(strQueueName, QueueAccessMode.SendAndReceive)
Dim propertyFilter As New MessagePropertyFilter
propertyFilter.ArrivedTime = True
propertyFilter.Body = True
propertyFilter.Id = True
propertyFilter.LookupId = True
objQueue.MessageReadPropertyFilter = propertyFilter
objQueue.Formatter = New ActiveXMessageFormatter
AddHandler objQueue.PeekCompleted, AddressOf MessageFound
objQueue.BeginPeek()
end main
Public Sub MessageFound(ByVal s As Object, ByVal args As PeekCompletedEventArgs)
Dim oQueue As MessageQueue
Dim oMessage As Message
' Retrieve the queue from which the message originated
oQueue = CType(s, MessageQueue)
oMessage = oQueue.EndPeek(args.AsyncResult)
If oMessage.LookupId <> lastid Then
' Process the message here
lastid = oMessage.LookupId
' let's write it out
log.write(oMessage)
End If
objQueue.BeginPeek()
End Sub
