Introducing Windows Azure- P42 pdf

The responsibility of this Windows-based application is to select a drawing shape type and publish a message with the type of PostData that contains a string description and the enumerat

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SoftnetSolutions.RelayService.ShapeController

The Draw Shape Controller is another part of this system The responsibility of this Windows-based

application is to select a drawing shape type and publish a message with the type of PostData that contains a string description and the enumeration value for the selected drawing shape The data contract PostData is defined in Listing 6-12 and implements the IComparable interface to allow the service application to check for selected drawing shape changes from the client drawing controller application The implementation of this class is straightforward as Listing 6-16 shows When a button is clicked, a different drawing shape is selected and a new PostData object is created and sent out as part of the publishing message sent from the drawing controller to the shape-drawing application The component that we use to create out the communication channel is the HybridPublishService we created in the last exercise

Listing 6-16 Implementation of ShapeController

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Windows.Forms;

using System.ServiceModel;

using Microsoft.ServiceBus;

namespace SoftnetSolutions.RelayService.ShapeController

{

using SoftnetSolutions.RelayService.ServiceContract;

using SoftnetSolutions.Shape;

using SoftnetSolutions.Shape.Draw;

public partial class FormController : Form

{

private IPublishEventService publishEventService = null;

private HybridPublishService hybridPublishService = null;

private string connectionStatus = "Disconnected";

public FormController()

{

InitializeComponent();

}

public FormController(IPublishEventService publishEventService)

{

InitializeComponent();

publishEventService = publishEventService;

string endpoint = "RelayEndpoint";

hybridPublishService = new HybridPublishService(endpoint);

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IHybridConnectionStatus hybridConnectionStatus =

hybridPublishService.ClientChannel.GetProperty<IHybridConnectionStatus>();

connectionStatus = hybridConnectionStatus.ConnectionState.ToString();

hybridConnectionStatus.ConnectionStateChanged +=

new EventHandler<HybridConnectionStateChangedArgs>(

hybridConnectionStatus ConnectionStateChanged);

( publishEventService as FormDrawShape).Show();

}

private void btnCircle Click(object sender, EventArgs e)

{

PostData shapeData = new PostData();

shapeData.shape = SHAPE TYPE.CIRCLE;

PostMessage(shapeData);

}

private void btnRectangle Click(object sender, EventArgs e)

{

PostData shapeData = new PostData();

shapeData.shape = SHAPE TYPE.RECTANGLE;

PostMessage(shapeData);

}

private void btnSqure Click(object sender, EventArgs e)

{

PostData shapeData = new PostData();

shapeData.shape = SHAPE TYPE.SQUARE;

PostMessage(shapeData);

}

private void btnEcllipse Click(object sender, EventArgs e)

{

PostData shapeData = new PostData();

shapeData.shape = SHAPE TYPE.ELLIPSE;

PostMessage(shapeData);

}

private void hybridConnectionStatus ConnectionStateChanged(

object sender, HybridConnectionStateChangedArgs args)

{

System.Diagnostics.Trace.WriteLine(

string.Format(

" -Connection has been switched from relay to direct connection -{0}",

Environment.NewLine));

connectionStatus = args.ConnectionState.ToString();

}

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private void PostMessage(PostData postData)

{

postData.Message =

string.Format("[{0}]:Shape Controller select <{1}>", DateTime.Now.ToString(), postData.shape);

publishEventService.OnShapeSelectChanged(postData);

publishEventService.PostMessage(postData);

}

private void timer1 Tick(object sender, EventArgs e)

{

textBoxConnectinStatus.Text = connectionStatus;

switch ( connectionStatus)

{

case "Relayed":

textBoxConnectinStatus.ForeColor = Color.Red;

break;

case "Direct":

textBoxConnectinStatus.ForeColor = Color.Lime;

break;

}

}

}

}

Before going any further, we should look at port forwarding when using netTcpRelayBinding with Hybrid mode This may or may not be a potential issue depending upon the Internet service provider behind the system infrastructure, especially if you are working from a small LAN system or from home

Port Forwarding

If the DHCP connection type is used by the local gateway system, port forwarding usually needs to

be configured in order that the communication from NET Service Bus can be routed to the

application correctly How to configure port forwarding depends on the Internet provider your organization has Port forwarding should be configured to allow Internet access to port 80 using HTTP and port 808 using TCP Figure 6-11 shows how to configure port forwarding based on the Verizon FIOS gateway

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Figure 6-11 An example of port forwarding configuration using Verizon FIOS gateway

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Change Credential Type

To modify the access federation type, modify the configuration file App.config for ShapeController The boldface lines in Listing 6-17 and Listing 6-18 show how to use the CardSpace and AutomaticRenewal credentials respectively The most frequently used options of federation are

• CardSpace

• UserNamePassword

• X509Certificate

• AutomaticRenewal

Listing 6-17 Change the Credential Type to CardSpace in the Configuration File App.config of

ShapeController

<?xml version="1.0" encoding="utf-8" ?>

<configuration>

<appSettings>

<add key="Topic" value="PublishEventService"/>

<add key="Solution" value="SoftnetSolutionsServiceBus"/>

<add key="password" value="9j!Ns$R8%7"/>

</appSettings>

<system.serviceModel>

<bindings>

<netTcpRelayBinding>

<binding name="default" connectionMode="Hybrid">

<security mode="None" />

</binding>

</netTcpRelayBinding>

</bindings>

<behaviors>

<endpointBehaviors>

<behavior name="CardSpaceBehavior">

<transportClientEndpointBehavior credentialType="CardSpace">

<clientCredentials>

<userNamePassword

userName="SoftnetSolutionsServiceBus"

password="9j!Ns$R8%7" />

<federationViaCardSpace>

<issuer address="http://idp.sts.microsoft.com" />

<claimTypeRequirements>

<add claimType=http://schemas.xmlsoap.org/claims/Group

isOptional="false" />

</claimTypeRequirements>

</federationViaCardSpace>

</clientCredentials>

</transportClientEndpointBehavior>