在多个Web应用程序工作进程中运行自托管的WCF

Question

In a web application I run a simple wcf host :

Uri baseAddress = new Uri("http://localhost:8080/hello");

using (ServiceHost host = new ServiceHost(typeof(HelloWorldService), baseAddress))
{
    ServiceMetadataBehavior smb = new ServiceMetadataBehavior();
    smb.HttpGetEnabled = true;
    smb.MetadataExporter.PolicyVersion = PolicyVersion.Policy15;
    host.Description.Behaviors.Add(smb);

    host.Open();
}

I wrote it at Global.asax/Start . So it opens and listens on the port 8080 at the beginning of the my web application and I can invoke any methods defined in my HelloWorldService through http://localhost:8080/hello . I have published it on IIS and it works too and everything is ok.

The problem arises when I increase the Maximum Worker Processes value to 2 or more than 1 .

The point is that every worker process is a separated process which want to obtain port 8080 but the OS does not allow to more than one process to get it.

It seems the problem will solve by handling exception, so just one of processes will get the port. but that is not true! When recycle happens for the process which have the port, there is no guarantee a new worker process be executed immediately.

Notice: Any solutions which separates host and my web application is not acceptable, because the all business inside of service will be injected and controlled by my web application.

I have an idea. I will take different ports in every process and run them. Also I have read Application Request Routing to use load balancing feature to disperse one particular port to several different ports which has obtained by a worker process.

please appreciate me or give me a solution to do it.

Answer 1

You can use port pool. On global.asax choose one of the unused port.

Web application may not a good choice to host WCF service.