Current thread works even service time out? - wcf

Question

I have created a wcf service in order to test wcf time outs. my problem is even time out has expired its still works.
In this service i have created long running method and in there i create log file,then i let to service time out.but even service time out has expired still log file appending data till to the long running method finish execution.?
How this happen? are there is a way to stop that ?
service timeout is 1 min
long running method duration is :10 mins
This service hosted in IIS 7.5 using WAS
here is the my service implementation class
public class LongRunner : ILongRunner
{
public void LongRunnerMethod()
{
int counter = int.Parse(ConfigurationManager.AppSettings["val"]);
string text = string.Empty;
for (int i = 0; true; i++)
{
Thread.Sleep(1000);
if (i >= counter)
break;
text = string.Concat(i.ToString(), DateTime.Now.ToString());
File.AppendAllText(#"C:\Looger\log.txt", text);
}
}
}
Here is the my service interface
[ServiceContract]
public interface ILongRunner
{
[OperationContract]
void LongRunnerMethod();
}
Finally here is the web config
<?xml version="1.0"?>
<configuration>
<appSettings>
<add key="val" value="600"/>
</appSettings>
<system.web>
<compilation debug="true" targetFramework="4.0" />
</system.web>
<system.serviceModel>
<services>
<service behaviorConfiguration="ORServiceBehavior" name="PTS.LongRunner">
<endpoint binding="netTcpBinding" bindingConfiguration="DefaultNetTcpBinding" name="ORServiceTCPEndPoint"
contract="PTS.ILongRunner" address="" >
<identity>
<dns value="localhost" />
</identity>
</endpoint>
<endpoint address="mex" binding="mexTcpBinding" bindingConfiguration="" contract="IMetadataExchange"/>
<host>
<baseAddresses>
<add baseAddress="net.tcp://localhost:8079/___/_________.svc" />
</baseAddresses>
</host>
</service>
</services>
<bindings>
<netTcpBinding>
<binding name="DefaultNetTcpBinding" maxBufferSize="2147483647" maxConnections="10" maxReceivedMessageSize="2147483647" maxBufferPoolSize="2147483647" >
<reliableSession enabled="false" ordered="false" inactivityTimeout="00:10:00"/>
<readerQuotas maxArrayLength="2147483647" maxBytesPerRead="2147483647" maxDepth="32" maxNameTableCharCount="2147483647" maxStringContentLength="2147483647"/>
<security mode="Message">
<transport clientCredentialType="Windows"/>
</security>
</binding>
</netTcpBinding>
</bindings>
<behaviors>
<serviceBehaviors>
<behavior name="ORServiceBehavior">
<serviceMetadata httpGetEnabled="false" />
<serviceDebug includeExceptionDetailInFaults="false" />
<serviceThrottling maxConcurrentCalls="200" maxConcurrentSessions="200" maxConcurrentInstances="200" />
<dataContractSerializer maxItemsInObjectGraph="50000" />
</behavior>
</serviceBehaviors>
</behaviors>
</system.serviceModel>
<system.webServer>
<modules runAllManagedModulesForAllRequests="true"/>
</system.webServer>
</configuration>

Answer 1

WCF has many timeouts...
binding timeouts: SendTimeout, OpenTimeout and CloseTimeout (default 1 minute), ReceiveTimeout (default 10 minutes)
service host: OpenTimeout (default 1 minute), CloseTimeout (default 10 seconds)
reliable session inactivity timeout: default 10 minutes
anything that inherits ConnectionOrientedTransportBindingElement e.g. NetTcp: ChannelInitializationTimeout default 30 seconds
My guess is that you have gotten "Unhandled Exception: System.TimeoutException: The open operation did not complete within the allotted timeout of ...." - this means that proxy has timed out waiting for service to send a response.
"how this happens? [that service keep logging even if you have a "operation did not complete" timeout]"
ServiceHost has allocated a thread to process the request made to the LongRunnerMethod method. This thread will finish processing the request until something catastrophic (e.g. process host shutdown) or exception is raised from inside a method.
"is there a way to stop that [interrupt the thread processing the method call]?"
You would need to get the signal from external source that you need to check on every n-th iteration to see if you should continue. You would need to pass something from the client in a form of unique id (ticket) to the first method then use this id with a Cancel method that will set the signal for the LongRunnerMethod to abort processing.
Here is an example using msmq which allows true one-way call:
SERVER
class Program
{
static void Main(string[] args)
{
var baseAddress = "net.msmq://localhost/private/";
var address = "ILongRunner";
var host = new ServiceHost(typeof (LongRunner), new Uri(baseAddress));
var binding = new NetMsmqBinding(NetMsmqSecurityMode.None);
var se = host.AddServiceEndpoint(typeof (ILongRunner), binding, address );
se.VerifyQueue(); //comes from IDesign ServiceModelEx http://www.idesign.net/Downloads/GetDownload/1887
host.Open();
Console.WriteLine("Press any key to stop");
Console.ReadLine();
}
}
[ServiceBehavior(ConcurrencyMode = ConcurrencyMode.Multiple, InstanceContextMode = InstanceContextMode.PerCall)]
public class LongRunner : ILongRunner
{
private static readonly ConcurrentBag<Guid> Cancelations = new ConcurrentBag<Guid>();
public void CancelLongRunnerMethod(Guid id)
{
if (Cancelations.All(z => z != id))
Cancelations.Add(id);
}
public void LongRunnerMethod(Guid id)
{
int counter = 300000;
//concurrent write will require different technique
var file = string.Format(#"D:\log.{0}.txt", id);
for (int i = 0; true; i++)
{
//check every 5th call
if (i % 5 == 0)
{
if (Cancelations.Any(z => z == id))
{
Guid cancelationId;
Cancelations.TryTake(out cancelationId);
if (cancelationId == id)
{
Debug.WriteLine(string.Format("LongRunnerMethod {0} canceled", id));
return;
}
}
}
Thread.Sleep(10);
Console.WriteLine("at " + i);
if (i >= counter)
break;
var text = string.Format("{0} {1} \n", i.ToString(), DateTime.Now.ToString());
File.AppendAllText(file, text);
}
Console.WriteLine("Complete " + id);
}
}
[ServiceContract()]
public interface ILongRunner
{
[OperationContract(IsOneWay = true)]
void CancelLongRunnerMethod(Guid id);
[OperationContract(IsOneWay = true)]
void LongRunnerMethod(Guid id);
}
CLIENT
class Program
{
static void Main(string[] args)
{
var baseAddress = "net.msmq://localhost/private/";
var address = "ILongRunner";
var binding = new NetMsmqBinding(NetMsmqSecurityMode.None);
var c1 = new ChannelFactory<ILongRunner>(binding, new EndpointAddress(new Uri(baseAddress + address)));
var proxy = c1.CreateChannel();
var request1 = Guid.NewGuid();
proxy.LongRunnerMethod(request1);
var co = c1 as ICommunicationObject;
co.Close();
var c2 = ChannelFactory<ILongRunner>.CreateChannel(binding, new EndpointAddress(new Uri(baseAddress + address)));
var request2 = Guid.NewGuid();
c2.LongRunnerMethod(request2);
Thread.Sleep(5000);
var c3 = new ChannelFactory<ILongRunner>(binding, new EndpointAddress(new Uri(baseAddress + address)));
var proxy2 = c3.CreateChannel();
proxy2.CancelLongRunnerMethod(request1);
var co2 = c3 as ICommunicationObject;
co2.Close();
}
}