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SOA Patterns with BizTalk 2013, Second Edition
SOA Patterns with BizTalk 2013, Second Edition

SOA Patterns with BizTalk 2013, Second Edition: Learn how to create and implement SOA strategies on the Microsoft technology stack using BizTalk Server 2013 and Azure Integration platforms

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Profile Icon Coen J Dijkgraaf Profile Icon Mark T Brimble Profile Icon Richard Seroter Profile Icon Johann Cooper Profile Icon Colin Dijkgraaf Profile Icon Mark Brimble Profile Icon Mahindra Morar +3 more Show less
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Profile Icon Coen J Dijkgraaf Profile Icon Mark T Brimble Profile Icon Richard Seroter Profile Icon Johann Cooper Profile Icon Colin Dijkgraaf Profile Icon Mark Brimble Profile Icon Mahindra Morar +3 more Show less
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€36.99
Paperback Jun 2015 508 pages 1st Edition
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SOA Patterns with BizTalk 2013, Second Edition

Chapter 2. Windows Communication Foundation Primer

 

Good communication is as stimulating as black coffee, and just as hard to sleep after.

 
 --Anne Morrow Lindbergh

Windows Communication Foundation (WCF) is a critical part of the Microsoft services strategy and a key part of BizTalk Server 2013 platform. WCF is a rich and expansive topic, so this chapter will only focus on the key aspects of WCF, which prepares us for its usage in later chapters.

In this chapter, you will learn:

  • What WCF is and why it matters
  • How to construct and configure new WCF services
  • Service hosting options
  • How to call a WCF service from a client application

What is WCF?

In a nutshell, WCF is a framework for building and hosting services. WCF services make use of standard technologies to offer a wide range of cross-platform security, transaction, and communication capabilities.

Before WCF came along, .NET developers who built distributed applications had to choose between communication schemes such as ASP.NET web services, .NET remoting, and Message Queuing (MSMQ). This choice carried with it implications for how the component was designed, developed, deployed, and consumed. If you went with ASP.NET web services, you were committing to XML message formats and were handcuffed by limitations of the HTTP transport protocol. If you chose .NET remoting, you were able to process messages in an efficient fashion, but have immediately limited yourself to .NET-only service clients. MSMQ is wonderful for disconnected applications, but in choosing it you've eliminated any chance at having a synchronous, request-response conversation with a software...

Defining the contract

Unlike ASP.NET web services, WCF truly promotes a "contract first" design style where developers need to thoughtfully consider how the outside world will interact with their service. There is a clean separation between the interface definition and the actual implementation of the service. When building ASP.NET services, the developer typically takes a code-first approach, where .NET classes are decorated with attributes and exposed as services. In the WCF model, we focus first on the data being shared and what our interface to the outside world should look like (the contract). Only after this critical step is complete does the WCF developer begin to design the actual service implementation logic.

There are actually three different contracts that you may define for a WCF service:

  • Service contract
  • Data contract
  • Fault contract

There's actually a fourth contract type corresponding to the message, but I won't be covering that here. We'll investigate...

Implementing contracts in services

Once we have decided upon an interface definition for a service, we are able to move forward with the service which implements this interface. For those of you who have previously built .NET interface classes and then realized those interfaces in subsequent concrete classes, the WCF model is quite natural. In fact, it's the same. We build a concrete service class and choose to implement the WCF service contract defined earlier. For this example, we will take the previously built interface (which has since had its Insert operations replaced by a single operation that takes a data contract parameter) and implement the service logic.

Note

Consider creating distinct Visual Studio projects to house the service contract and the service implementation. This allows you to share the contract project with service consumers without sharing details of the service that realizes the contract. This idea is shown in the following screenshot:

Implementing contracts in services

An example code for the...

Choosing an endpoint address

It's great that we've talked about the important C (the contract) in the ABCs of WCF endpoints, but the story is far from complete. So far, we have a service definition completely devoid of transport information. Where does someone go to consume this service? The goal of the endpoint address is to:

  • Tell us the communication scheme
  • Tell us the location of the service

WCF provides a number of out-of-the-box communication schemes for accessing WCF services. These include options such as:

  • HTTP
  • TCP
  • MSMQ

When looking at a service URI such as https://packt:8081/VendorService/SecureVendorService.svc, what am I able to infer from this WCF address? First, I can see that I'm using an HTTP/S scheme in order to secure my HTTP transmission channel via SSL certificates. Next, I can tell that the domain hosting this service is called packt and uses port 8081 for the HTTP/S traffic. Finally, I can gather the path of the service that I wish to call.

We'll see shortly...

The role of service bindings

The WCF service binding (or the B in the WCF endpoint ABCs) is the channel stack that ties up how a service actually transmits data across the wire. The stack is made up of individual elements that make up the message communication. This includes elements that control security options, session capacity, and transaction capabilities. They are also used to determine how a message is actually encoded during transmission, whether that is in text/XML, binary format, or the new Message Transmission Optimization Mechanism (MTOM) format.

WCF provides a series of bindings for the available WCF transports, which offer the most compatible and logical component order for a given transport. Let's review the key bindings that are also available with BizTalk Server 2013 as adapters:

  • BasicHttpBinding: This binding works great for ASMX SOAP clients that only support the SOAP 1.1 Basic Profile. By default, there is no security aspect enabled, no session or transaction capabilities...

What is WCF?


In a nutshell, WCF is a framework for building and hosting services. WCF services make use of standard technologies to offer a wide range of cross-platform security, transaction, and communication capabilities.

Before WCF came along, .NET developers who built distributed applications had to choose between communication schemes such as ASP.NET web services, .NET remoting, and Message Queuing (MSMQ). This choice carried with it implications for how the component was designed, developed, deployed, and consumed. If you went with ASP.NET web services, you were committing to XML message formats and were handcuffed by limitations of the HTTP transport protocol. If you chose .NET remoting, you were able to process messages in an efficient fashion, but have immediately limited yourself to .NET-only service clients. MSMQ is wonderful for disconnected applications, but in choosing it you've eliminated any chance at having a synchronous, request-response conversation with a software client...

Defining the contract


Unlike ASP.NET web services, WCF truly promotes a "contract first" design style where developers need to thoughtfully consider how the outside world will interact with their service. There is a clean separation between the interface definition and the actual implementation of the service. When building ASP.NET services, the developer typically takes a code-first approach, where .NET classes are decorated with attributes and exposed as services. In the WCF model, we focus first on the data being shared and what our interface to the outside world should look like (the contract). Only after this critical step is complete does the WCF developer begin to design the actual service implementation logic.

There are actually three different contracts that you may define for a WCF service:

  • Service contract

  • Data contract

  • Fault contract

There's actually a fourth contract type corresponding to the message, but I won't be covering that here. We'll investigate the service and data contract...

Implementing contracts in services


Once we have decided upon an interface definition for a service, we are able to move forward with the service which implements this interface. For those of you who have previously built .NET interface classes and then realized those interfaces in subsequent concrete classes, the WCF model is quite natural. In fact, it's the same. We build a concrete service class and choose to implement the WCF service contract defined earlier. For this example, we will take the previously built interface (which has since had its Insert operations replaced by a single operation that takes a data contract parameter) and implement the service logic.

Note

Consider creating distinct Visual Studio projects to house the service contract and the service implementation. This allows you to share the contract project with service consumers without sharing details of the service that realizes the contract. This idea is shown in the following screenshot:

An example code for the service...

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Description

If you are a developer who has been tasked with building service-oriented BizTalk Server solutions, this book is for you. It will help you to envision an enterprise solution and implement the software blueprint.

Who is this book for?

If you are a developer who has been tasked with building service-oriented BizTalk Server solutions, this book is for you. It will help you to envision an enterprise solution and implement the software blueprint.

What you will learn

  • Understand how to implement SOA with BizTalk Server and the Azure platform
  • Consume and expose WCF services effectively via the use of Service Bus Relays and RESTful services
  • Implement effective schema design, including an introduction to various schema design patterns
  • Exploit various message exchange/endpoint patterns including requestresponse, fire and forget, and client callbacks
  • Leverage orchestration design patterns that maximize flexibility and reuse
  • Futureproof your BizTalk Server artifacts using well thought out versioning strategies
  • Build looselycoupled BizTalk applications using the ESB Toolkit
  • Take a peek at API Apps, Logic Apps, and Azure API Management
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Publication date : Jun 30, 2015
Length: 508 pages
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Language : English
ISBN-13 : 9781784396466

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Language : English
ISBN-13 : 9781784396466

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Table of Contents

15 Chapters
1. Building BizTalk Server 2013 Applications Chevron down icon Chevron up icon
2. Windows Communication Foundation Primer Chevron down icon Chevron up icon
3. Using WCF Services in BizTalk Server 2013 Chevron down icon Chevron up icon
4. REST and JSON Support in BizTalk Server 2013 Chevron down icon Chevron up icon
5. Azure BizTalk Services Chevron down icon Chevron up icon
6. Azure Service Bus Chevron down icon Chevron up icon
7. Planning Service-oriented BizTalk Solutions Chevron down icon Chevron up icon
8. Schema and Endpoint Patterns Chevron down icon Chevron up icon
9. Asynchronous Communication Patterns Chevron down icon Chevron up icon
10. Orchestration Patterns Chevron down icon Chevron up icon
11. Versioning Patterns Chevron down icon Chevron up icon
12. Frameworks and Tools Chevron down icon Chevron up icon
13. New SOA Capabilities in BizTalk Server 2013 – Azure Hybrid Patterns Chevron down icon Chevron up icon
14. What's New and What's Next? Chevron down icon Chevron up icon
Index Chevron down icon Chevron up icon
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