using System;
using System.Collections.Generic;
using System.Text;
using System.ServiceModel;
using System.ServiceModel.Dispatcher;
using System.ServiceModel.Channels;
using System.ServiceModel.Description;

namespace WCFSample
{
    class Program
    {
        static void Main(string[] args)
        {
            //Hidden singleton hosting
//            ServiceHost host = new ServiceHost(typeof(MyService), new Uri("http://localhost:8080/MyService"));

            //Wellknown singleton hosting
            ServiceHost host = new ServiceHost(new MyService(), new Uri("http://localhost:8080/MyService"));

            host.AddServiceEndpoint(typeof(IService), new BasicHttpBinding(), "");
            host.Open();

            IService client = ChannelFactory<IService>.CreateChannel(new BasicHttpBinding(), new EndpointAddress("http://localhost:8080/MyService"));
            client.SayHello();
            client.SayHello();
            client.SayHello();
            client.ReleaseInstance();
            client.SayHello();
            client.SayHello();
            client.SayHello();
            client.ReleaseInstance();
            client.SayHello();
            client.SayHello();
            client.SayHello();

            ((IClientChannel)client).Close();
            Console.WriteLine("Calling ServiceHost.Close()");
            host.Close();
        }
    }

    [ServiceContract]
    public interface IService
    {
        [OperationContract]
        void SayHello();

        [OperationContract]
        void ReleaseInstance();
    }

    [ServiceBehavior(InstanceContextMode=InstanceContextMode.Single, ConcurrencyMode=ConcurrencyMode.Single)]
    public class MyService : IService, IDisposable
    {
        int sayHelloCount;
        String id;
        
        public MyService()
        {
            id = Guid.NewGuid().ToString();
            Console.WriteLine("MyService Ctor called. Id = "+ id);
            sayHelloCount = 0;
        }

        #region IService Members

        public void SayHello()
        {
            sayHelloCount++;
            Console.WriteLine("SayHello count : " + sayHelloCount);
        }

        public void ReleaseInstance()
        {
            Console.WriteLine("Calling ReleaseServiceInstance");
            OperationContext.Current.InstanceContext.ReleaseServiceInstance();
            Console.WriteLine("Calling GetServiceInstance");
            OperationContext.Current.InstanceContext.GetServiceInstance();
        }

        #endregion

        #region IDisposable Members

        public void Dispose()
        {
            Console.WriteLine("Destructor called for Id : " + id);
        }

        #endregion
    }
}