Per Call Based - Instance Management in WCF hosted on Web App

Vijay Prativadi
13y
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Question Arises: What is Instance Management?

We can say it is a type of rules governed to manage the services with clients. It provides high end in scalability, durability and effective transaction management.

Question Arises: What is Per-Call Based Instance Management?

Basically, we can say every time a new service instance will be created when the client makes request. Based on the client request the method returns desired response back to client. Once the response is sent back to client, the dispose method will we will be declaring in this application releases the instances.

So, let's try to implement this concept so that we can get much better idea on this:

So, firstly we will create simple method in IService1, Where the Complete Code of IService1.cs looks like this:

using System.ServiceModel;
namespace SimpleInstanceManagement
{
    // NOTE: You can use the "Rename" command on the "Refactor" menu to change the interface name "IService1" in both code and config file together.
    [ServiceContract]
    public interface IService1
    {
        [OperationContract] int SimpleMethod(int a);
    }
}

The Complete Code of Service1.svc looks like this:

using System;
using System.ServiceModel;
namespace SimpleInstanceManagement
{
    // NOTE: You can use the "Rename" command on the "Refactor" menu to change the class name "Service1" in code, svc and config file together.
    [ServiceBehavior(InstanceContextMode = InstanceContextMode.PerCall)]
    public class Service1 : IService1, IDisposable
    {
        public int Heighter = 0;
        public int SimpleMethod(int a)
        {
            a = (Heighter = Heighter + 1); return a;
        }
        public void Dispose()
        {
            Heighter = Heighter - 1;
        }
    }
}

The Complete Code of Web.Config looks like this:

<?xml version="1.0"?>
<configuration>
<system.web>
    <compilation debug="true" targetFramework="4.0" />
</system.web>
<system.serviceModel>
    <behaviors>
      <serviceBehaviors>
        <behavior name="Application">
          
          <serviceMetadata httpGetEnabled="true"/>
          
          <serviceDebug includeExceptionDetailInFaults="false"/>
        </behavior>
      </serviceBehaviors>
    </behaviors>
    <serviceHostingEnvironment multipleSiteBindingsEnabled="true" />
    <services>
      <service name="SimpleInstanceManagement.Service1" behaviorConfiguration="Application">
        <endpoint address="/SimpleAddress" binding="basicHttpBinding" contract="SimpleInstanceManagement.IService1"> </endpoint>
        <endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange"> </endpoint>
        <host>
          <baseAddresses>
            <add baseAddress="http://localhost:49257/Service1.svc"/>
          </baseAddresses>
        </host>
      </service>
    </services>
</system.serviceModel>
<system.webServer>
    <modules runAllManagedModulesForAllRequests="true"/>
</system.webServer>
</configuration>

I have created New Web Application where I have added it to existing solution files. I have specified service reference with a link as given below:

http://localhost:49257/Service1.svc

The Complete Code of WebForm1.aspx looks like this:

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="Instance.WebForm1" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <center>
            <table>
                <tr>
                    <td>
                        <asp:Label ID="Label1" runat="server" Text="Please Enter Some Value" ForeColor="Brown"
                            Font-Bold=" true" Font-Italic="true">
                        </asp:Label>
                    </td>
                    <td>
                        <asp:TextBox ID="TextBox1" runat="server">
                        </asp:TextBox>
                    </td>
                </tr>
                <tr>
                    <td>
                    </td>
                    <td>
                        <asp:Button ID="Button1" runat="server" Text="Click Here" OnClick="Button1Click"
                            Style="margin-left: 0px" Width="118px" />
                    </td>
                </tr>
            </table>
        </center>
    </div>
    </form>
</body>
</html>

The Complete Code of WebForm1.aspx.cs looks like this:

using System;
using Instance.ServiceReference1;

namespace Instance
{
    public partial class WebForm1 : System.Web.UI.Page
    {
        protected void PageLoad(object sender, EventArgs e)
        {

}

        protected void Button1Click(object sender, EventArgs e)
        {
            if (TextBox1.Text != null)
                if ((TextBox1.Text) == "1")
                {
                    var ab = new Service1Client();
                    Response.Write("<center>The Value is: <b>" + ab.SimpleMethod((Convert.ToInt32(TextBox1.Text))) +
                    "</br></b></center>");
                    Response.Write("<center>The Value is: <b>" + ab.SimpleMethod((Convert.ToInt32(TextBox1.Text))) +
                    "</br></b></center>");
                    Response.Write("<center>The Value is: <b>" + ab.SimpleMethod((Convert.ToInt32(TextBox1.Text))) +
                    "</br></b></center>");

                    Response.Write("<center><i>Second Instance Created for Service</i></center>");
                    var bc = new Service1Client();
                    Response.Write("<center>The Value is: <b>" + bc.SimpleMethod(Convert.ToInt32(TextBox1.Text)) +
                    "</br></b></center>");
                    Response.Write("<center>The Value is: <b>" + bc.SimpleMethod(Convert.ToInt32(TextBox1.Text)) +
                    "</br></b></center>");
                    Response.Write("<center>The Value is: <b>" + bc.SimpleMethod((Convert.ToInt32(TextBox1.Text))) +
                    "</br></b></center>");
                    Response.Write("<center>The Value is: <b>" + bc.SimpleMethod((Convert.ToInt32(TextBox1.Text))) +
                    "</br></b></center>");
                }
                else
                {
                    Response.Write("<center><b><i>Please Enter Some Values or Enter Correct Values</i></b></center>");
                }
        }
    }
}

The Output of the application looks like this:

Per Call Output.png

The Output of the application if entered wrong or null:

Error Pop Out for Per Call.png
I hope this article is useful for you.

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