using System;

 using System.Collections.Generic;

 using System.Linq;

 using System.Text;

 using System.Threading.Tasks;

 using System.ServiceModel;

 using System.Collections;

 namespace SharpDisplayInterface

 {

     [ServiceContract(   CallbackContract = typeof(IDisplayServiceCallback),

                         SessionMode = SessionMode.Required)]

     public interface IDisplayService

     {

         /// <summary>

         /// Set the name of this client.

         /// Name is a convenient way to recognize your client.

         /// Naming you client is not mandatory.

         /// In the absence of a name the session ID is often used instead.

         /// </summary>

         /// <param name="aClientName"></param>

         [OperationContract(IsOneWay = true)]

         void SetName(string aClientName);

         /// <summary>

         /// Put the given text in the given field on your display.

         /// Fields are often just lines of text.

         /// </summary>

         /// <param name="aFieldIndex"></param>

         /// <param name="aText"></param>

         [OperationContract(IsOneWay = true)]

         void SetText(int aFieldIndex, string aText);

         /// <summary>

         /// Allows a client to set multiple text fields at once.

         /// First text in the list is set into field index 0.

         /// Last text in the list is set into field index N-1.

         /// </summary>

         /// <param name="aTexts"></param>

         [OperationContract(IsOneWay = true)]

         void SetTexts(System.Collections.Generic.IList<string> aTexts);

         /// <summary>

         /// Provides the number of clients currently connected

         /// </summary>

         /// <returns></returns>

         [OperationContract()]

         int ClientCount();

     }

     public interface IDisplayServiceCallback

     {

         [OperationContract(IsOneWay = true)]

         void OnConnected();

         /// <summary>

         /// Tell our client to close its connection.

         /// Notably sent when the server is shutting down.

         /// </summary>

         [OperationContract(IsOneWay = true)]

         void OnCloseOrder();

     }

 }