WCF / ASMX :: Do Multiple WCF Web Service Requests Queue Up Or Do They Run In Parallel
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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Mar 14, 2011
I am seeking your expertise in ASP.Net with regards to multi-thread support of WebService in a scenario , that is If a WebService-Client is making simultaneous calls from the same process, the requests will be serialized at the WebServices so that only one-call will execute at any one time , on the contrary, if those calls are sent from different WebService-Clients ( Instances/Processes) , they are processed in-parallel by WebServices.
Have you ever experienced the same with ASP.Net, and what configurations/Settings should be followed, in order for a WebServices to concurrently process simultaneous calls form a single WebClient , when deploying a large number of Web-Clients' instances/processes is impractical in a project-context.
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Apr 20, 2010
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Dec 15, 2010
I have a custom dead letter queue service to pick up messages from DLQ. This service picks up failed message from DLQ and tries to resend to a different end point. If the new endpoint doesn't work, it rolls back transaction. This works great. Here is the code.
{
[ServiceBehavior(InstanceContextMode = InstanceContextMode.Single,
ConcurrencyMode = ConcurrencyMode.Single,
AddressFilterMode = AddressFilterMode.Any)]
public class FDPDLQService : IFDService
{
FDPManager _fdpManager = new FDPManager();
[OperationBehavior(TransactionScopeRequired = true, TransactionAutoComplete = true)]
public void ProcessFDMessage(FDMessage message)
{
//System.Diagnostics.Debugger.Launch();
try
{
MsmqMessageProperty mqProp =
OperationContext.Current.IncomingMessageProperties[MsmqMessageProperty.Name] as MsmqMessageProperty;
// if message log required, and configured, log the incoming message
try
{
ChannelFactory<IFDPRouter> factory = new ChannelFactory<IFDPRouter>("IFDPRouter_EP");
IFDPRouter proxy = factory.CreateChannel();
string ep = proxy.GetNextEPForGivenEP(OperationContext.Current.IncomingMessageHeaders.To.ToString());
if (ep == null || ep == string.Empty)
{
throw new EndpointNotFoundException(Common.Constants.FDP_NOT_FOUND_EXCEPTION_MESSAGE);
}
// Process message with next end point available
_fdpManager.ProcessFDMessage(message, ep);
}
catch (EndpointNotFoundException enfe)
{
ExceptionManager.HandleException(enfe);
Transaction.Current.Rollback();
//throw;
}
catch (Exception ex)
{
ExceptionManager.HandleException(ex);
Transaction.Current.Rollback();
//throw;
}
}
}
}
Below is config entries.
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<system.serviceModel>
<bindings>
<netMsmqBinding>
<binding name="DLQServiceBinding" closeTimeout="00:01:00" openTimeout="00:01:00"
receiveTimeout="00:10:00" sendTimeout="00:01:00" deadLetterQueue="Custom" customDeadLetterQueue ="net.msmq://localhost/private/FDPDLQ"
durable="true" exactlyOnce="true" maxReceivedMessageSize="65536"
maxRetryCycles="2" receiveErrorHandling="Fault" receiveRetryCount="5"
retryCycleDelay="00:30:00" timeToLive="00:01:00" useSourceJournal="false"
useMsmqTracing="false" queueTransferProtocol="Native" maxBufferPoolSize="524288"
useActiveDirectory="false">
<readerQuotas maxDepth="32" maxStringContentLength="8192" maxArrayLength="16384"
maxBytesPerRead="4096" maxNameTableCharCount="16384" />
<security mode="None">
<transport msmqAuthenticationMode="WindowsDomain" msmqEncryptionAlgorithm="RC4Stream"
msmqProtectionLevel="Sign" msmqSecureHashAlgorithm="Sha1" />
<message clientCredentialType="Windows" />
</security>
<!--deadLetterQueue="System">-->
</binding>
<binding name="DefaultBinding" >
<security mode="None" />
</binding>
<binding name="FDService_EP" closeTimeout="00:01:00" openTimeout="00:01:00" deadLetterQueue="Custom" customDeadLetterQueue ="net.msmq://localhost/private/FDPDLQ"
receiveTimeout="00:10:00" sendTimeout="00:01:00"
durable="true" exactlyOnce="true" maxReceivedMessageSize="65536"
maxRetryCycles="2" receiveErrorHandling="Fault" receiveRetryCount="5"
retryCycleDelay="00:30:00" timeToLive="00:01:00" useSourceJournal="false"
useMsmqTracing="false" queueTransferProtocol="Native" maxBufferPoolSize="524288"
useActiveDirectory="false">
<readerQuotas maxDepth="32" maxStringContentLength="8192" maxArrayLength="16384"
maxBytesPerRead="4096" maxNameTableCharCount="16384" />
<security mode="None">
<transport msmqAuthenticationMode="WindowsDomain" msmqEncryptionAlgorithm="RC4Stream"
msmqProtectionLevel="Sign" msmqSecureHashAlgorithm="Sha1" />
<message clientCredentialType="Windows" />
</security>
</binding>
<binding name="FDChecking_EP" closeTimeout="00:01:00" openTimeout="00:01:00"
receiveTimeout="00:10:00" sendTimeout="00:01:00" deadLetterQueue="System"
durable="true" exactlyOnce="true" maxReceivedMessageSize="65536"
maxRetryCycles="2" receiveErrorHandling="Fault" receiveRetryCount="5"
retryCycleDelay="00:30:00" timeToLive="1.00:00:00" useSourceJournal="false"
useMsmqTracing="false" queueTransferProtocol="Native" maxBufferPoolSize="524288"
useActiveDirectory="false">
<readerQuotas maxDepth="32" maxStringContentLength="8192" maxArrayLength="16384"
maxBytesPerRead="4096" maxNameTableCharCount="16384" />
<security mode="None">
<transport msmqAuthenticationMode="WindowsDomain" msmqEncryptionAlgorithm="RC4Stream"
msmqProtectionLevel="Sign" msmqSecureHashAlgorithm="Sha1" />
<message clientCredentialType="Windows" />
</security>
</binding>
</netMsmqBinding>
<netNamedPipeBinding>
<binding name="Teletrac.EFX.Interfaces.FDService.IFDPRouter" />
</netNamedPipeBinding>
</bindings>
<behaviors>
<serviceBehaviors>
<behavior name="DLQServiceBehaviour">
<serviceDebug includeExceptionDetailInFaults="true"/>
</behavior>
</serviceBehaviors>
</behaviors>
<services>
<service name="Teletrac.Customer.Services.FDPDLQService.FDPDLQService" >
<endpoint address="net.msmq://localhost/private/FDPDLQ" binding="netMsmqBinding"
contract="FDPServiceRef.IFDService"
bindingConfiguration="DefaultBinding"></endpoint>
</service>
</services>
<client>
<endpoint address="net.msmq://localhost/private/fdmessageQueue"
binding="netMsmqBinding" bindingConfiguration="DLQServiceBinding"
contract="FDPServiceRef.IFDService" name="FDService_EP" />
</client>
</system.serviceModel>
</configuration>
This works great.
But if all endpoints are not available for a long period of time, and if service rolls message back to the DLQ for a long period of time, after a certain period of time service stops picking up messages from DLQ. I am not sure which configuration is responsible for this.
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