Skip to main content

Message reliablity


When a message is sent across the network many things can go wrong. The message can be lost, dropped or sent in wrong order. This can happen due to a variety of reason, network failure, network congestion and proxy failure are few reasons among many other reasons. 

WCF Reliablity features sessions are used to take care most of the above issues. There are two types of reliability Message reliability and Transport reliability. These reliability features simplifies coding needed.

Enabling reliable session

Reliable sessions are built on top of SOAP messaging and enables connection maintenance, verification and message ordering. Turning on reliable session allow the application to ignore duplicates, retry dropped connection and reestablish connections, notify service when the client is not available anymore. However, the cost of this reliability is increased traffic.

Reliable session is easy to turn on. For some binding the reliable session is on by default whereas for other binding its off by default.
  • wsHttpBinding          - default is off
  • netTcpBinding           - default is off
  • wsDualHttpBinding    - default is on
1. Open the WCF service application that you created earlier or download start file here.

2. To make a session reliable, open the App.config of the host and add the following updates to the the binding configuration. 

        <bindings>
          <wsHttpBinding>
            <binding name ="WsHttpBindingConfig">
              <reliableSession />
            </binding>
          </wsHttpBinding>
        </bindings>

 3. To order the messages set the ordered property to true. 
<reliableSession ordered="true" /> 

Enabling Queued Messaging 

Enabling message queues makes the message persist until the message is successfully transferred across the wire. This allows asynchronous communication between the client and the server. This means the services and the client that consume that service do not have to be up and running at the same time making service host and client to be loosely coupled. Such feature is ideal in scenarios where the service may have to serve a huge loads temporarily.

4. To enable queued messages, first we need a queue. To create a queue, MSMQ should be installed. To check, open Computer Management and check if there is Message Queuing under Services and Applications. If not you will have to install MSMQ, do step 5, or else do step 8.

5. Open Control Panel (Win key + X > select Control Panel) > Programs > Programs and Features > Turn Windows features on or off > Expand Microsoft Message Queue (MSMQ) Server Core > check MSMQ HTTP Support >  click OK

6. Open Computer Management, expand Services and Applications, Expand Message Queuing > right click on Private Queues > select New > Private Queue > type productservice > click OK.

7. To use MSMQ with WCF you have to ensure that all the contract is marked OneWay. When using endpoint configured to use MSMQ, it is important to ensure all the operationcontract is marked IsOneWay=true. Update OperationContract of SubmitReview as shown below: 

    [ServiceContract]
    public interface IProductService
    {
        [OperationContract(IsOneWay=true)]
        void SubmitReview (ProductReview pr);

    }

8. Add the endpoint for MSMQ

<endpoint address="net.msmq://localhost/private/productservice" binding="netMsmqBinding"
bindingConfiguration="NetMsmqBindingConfig" contract="ProductServiceLibrary.IProductService" />


9. Add binding configuration for the above endpoint
       <bindings>
        <netMsmqBinding>
          <binding name="NetMsmqBindingConfig" exactlyOnce="false">
            <security mode="None"></security>
          </binding>
        </netMsmqBinding>

        </bindings>

10. Test the console host. It should work without any issues.

11. Update the service reference in the client.

ProductServiceClient client = new ProductServiceClient("NetMsmqBinding_IProductService");

12. Run the Service Host and Client at the same time and test it.

13. Now run only the service client and notice that it accepts a new product review even when the host is not running.

14. Go the Computer Management and check the ProductReview Queue you notice that there is a message that has been queued.

15 Try submitting another product review using the client, now you should see two messages queued

16. Now run the service host. Notice that service host now shows that two reviews have been added.

17. Check the productReview queue in the computer management you will not see any message queued now.

Labels:

Comments

Post a Comment

Popular posts from this blog

A Comprehensive Evaluation of the Internal Consulting Process: Steps and Considerations

Introduction Internal consulting has emerged as a critical function within organizations, offering in-house expertise to solve complex business problems and drive change. It closely mirrors external consulting in methodology but is differentiated by the consultant's intimate knowledge of the organization and a vested interest in its long-term success. This article aims to evaluate the key steps involved in the internal consulting process, offering insights into each phase's significance and challenges. Steps in the Internal Consulting Process The internal consulting process can generally be segmented into five distinct stages: Initial Assessment, Data Collection and Analysis, Solution Development, Implementation, and Evaluation. Below is an evaluation of each step: Step 1: Initial Assessment Objective: To understand the problem or opportunity area and define the scope of the project. Significance: A well-defined scope ensures that the consulting project stays focused and manage...
Post a Comment
Read more

The Evolving Landscape of Consulting Practice: Changes and Implications

Introduction Consulting is a field that thrives on its ability to adapt to market demands and emerging trends. As businesses evolve due to technological advancements, shifts in consumer behavior, and fluctuations in global markets, consulting practices must keep pace. This article explores some of the significant changes currently transforming the consulting industry and discusses their implications for both consultants and clients. Technological Disruption Data Analytics and Artificial Intelligence Consulting firms are increasingly integrating data analytics and artificial intelligence into their service offerings. These technologies allow consultants to offer data-driven insights that can significantly enhance strategic decision-making. This evolution means consultants now need skills in data interpretation and analysis, alongside their traditional expertise in business strategy. Virtual Consulting Platforms The advent of digital platforms enables consulting services to be offered re...
Post a Comment
Read more

The Skillset of Internal Consultants: A Comparative Analysis

Introduction In the organizational landscape, the role of internal consultants has gained prominence due to the increasing complexity of business problems and the need for specialized in-house expertise. While many skills required for internal consulting overlap with those of external consultants, there are distinct abilities that set them apart. This article aims to compare and contrast these skill sets to provide a clearer understanding of what makes an effective internal consultant. Skills Common to Both Internal and External Consultants Problem-Solving Both types of consultants need to excel at identifying issues and creating viable solutions. Critical thinking and analytical skills are paramount for dissecting complex situations and recommending actionable strategies. Communication Excellent communication skills are a must for any consultant. Whether it’s making a presentation to stakeholders, writing a report, or simply discussing ideas with a team, effective communication is key...
Post a Comment
Read more