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CHAPTER 6 AZURE .NET SERVICES SERVICE BUS
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transaction delivery between clients and servers is not supported by .NET Service Bus. Highlights of the technical features are shown in Table 6-1. Using the Microsoft .NET Service Bus in conjunction with WCF is the easiest way to build a connected distributed system. Table 6-1. Highlights of Technical Features for Available .NET Service Bus Connection Modes
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.NET Service Bus Relay Binding Types and Connection Mode
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netEventRelayBinding netOnewayRelayBinding
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Technical Specification Highlight
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Provide lightweight event-distribution mechanisms to deliver events to all participating parties via relay services from the cloud. Do not support duplex or call back. Do not support event filtering.
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Open Port Required
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netTcpRelayBinding netTcpRelayContextBinding
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Relayed Relayed mode is the default mode of TcpRelayConnection when configuring the connection bindings using the TCP relay binding. Direct In Direct mode, a typical scenario is two parties residing in the same intranet, and the service tries to promote the connection to direct. If the connection cannot be established, the initialization will fail. For the Hybrid connection mode, the relay service uses the Relayed mode to establish the connection and switches the connection to Direct connection. Web services relay binding, like regular WCF WS binding, sends and receives interoperable messages, which can be consumed using HTTP or HTTPS.
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808 or 828 for operation transport security bindings, 818 for data channel
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Hybrid
wsHttpRelayBinding wsHttpRelayContextBinding
There is no special port opening required; these binding types use the regular IIS ports, such as 80 for HTTP and 443 for HTTPS. 80 and 443 for HTTP and HTTPS respectively For the SSL protected.
basicHttpRelayBinding basicHttpRelayContextBinding
Similar to regular WCF basicHttpBinding. The basicHttpRelayBinding creates a publicly discoverable HTTP endpoint listening to the cloud-based Service Bus application.
CHAPTER 6 AZURE .NET SERVICES SERVICE BUS
The TCP relay binding offers the best performance and throughput. That supports request-response operation, one-way operation, and event duplex callback.
Post a Net Event Using Relay Connection
This exercise uses a very simple Windows console application to demonstrate how to post a net message event through .NET Service Bus. The connection model used in this exercise is the relay hub connection as shown in Figure 6-2. All participating parties are hooked up as a publisher as well as a subscriber. Any message posted to the hub will be delivered to all participating parties, which use the same endpoint address to bind to the WCF services. The type of binding used for this relay hub connection is netEventRelayBinding, which does not support two-way communication. It is good enough for this demo, since we just need to listen for events. All service operation contracts must be marked as OperationContract(IsOneWay = true) as the boldface lines show in Listing 6-1.
Note The code for this example is in the Exercise 6-1 bundle from the code download.
Figure 6-2. .NET Service Bus event hub Let s implement this now.
CHAPTER 6 AZURE .NET SERVICES SERVICE BUS
Create a WCF service. Listing 6-1 shows the service contract definition for the WCF service IPublishEventService. This interface exposes only one method, PostMessage().
Listing 6-1. Service Contract and Data Contract Definition for WCF Service IPublishEventService using System; using System.ServiceModel; namespace SoftnetSolutions.RelayService.PublishChannel { [ServiceContract( Name = "IPublishEventService", Namespace = "http://SoftnetSolutions.RelayService/")] public interface IPublishEventService { [OperationContract(IsOneWay = true)] void PostMessage(PostData postData); } public interface IRelayPublishEventService : IPublishEventService, IClientChannel { } using using using using System; System.ServiceModel; System.Runtime.Serialization; System.Text;
namespace SoftnetSolutions.RelayService.PublishChannel { [ServiceBehavior(Name = "PublishEventService", Namespace = "http://SoftnetSolutions.RelayService/", InstanceContextMode = InstanceContextMode.Single)] public class PublishEventService : IPublishEventService { private StringBuilder _messageBuffer = new StringBuilder(); public void PostMessage(PostData postData) { _messageBuffer.Append(string.Format("[{0}]:received message - {1}{2}", DateTime.Now.ToString(), postData.Message, Environment.NewLine)); Console.Write(_messageBuffer.ToString()); } } [DataContract] public class PostData
CHAPTER 6 AZURE .NET SERVICES SERVICE BUS
{ [DataMember] public string Message; } } 2. Now create the configuration for this service as shown in Listing 6-2, where the default binding netEventRelayBinding is used. This type of binding only supports oneway communication.
Listing 6-2. Configuration for IPublishEventService WCF Service Using netRelayEvent Bindings < xml version="1.0" encoding="utf-8" > <configuration> <appSettings> <add key="Topic" value="Pheonix"/> <add key="Solution" value="SoftnetSolutionsServiceBus"/> <add key="password" value="My password"/> </appSettings> <system.serviceModel> <bindings> <netEventRelayBinding> <binding name="default" /> </netEventRelayBinding> </bindings> <client> <endpoint name="RelayEndpoint" contract="SoftnetSolutions.RelayService.PublishChannel.IPublishEventService" binding="netEventRelayBinding" bindingConfiguration="default" address="" /> </client> <services> <service name="SoftnetSolutions.RelayService.PublishChannel.PublishEventService"> <endpoint name="RelayEndpoint" contract="SoftnetSolutions.RelayService.PublishChannel.IPublishEventService" binding="netEventRelayBinding" bindingConfiguration="default" address="" /> </service> </services> </system.serviceModel> </configuration>
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