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Figure 1-1. Early point-to-point integrations Figure 1-1 illustrates a trivial IT environment, one that has only two applications and two point-to-point integrations. Just to be clear, the first integration allows the CCM system to call the Billing system. The second integration point allows the Billing system to call the CCM system. When your IT department is this small, point-to-point integration is fairly easy to manage. Figure 1-2 expands on the problem a bit. The IT shop is now home to 8 software systems and a total of 11 integration points. This illustrates a common pattern in integration: the number of integration points grows faster than the number of systems you re integrating! Even Figure 1-2 is, by modern standards, a trivial IT system. A midsized service provider where Jeff once worked had 67 business systems and another 51 network systems. One hundred eighteen software systems integrated in a point-to-point manner is unmanageable. We know of telcos that have 12 or more billing systems. Having duplicates of certain software systems (such as billing) or having a large number of software systems in general is quite common; large companies can acquire smaller companies (and therefore acquire the software systems of the smaller companies) faster than most IT shops can integrate the newly acquired systems.

The following are the benefits of using an ORM framework: Productivity: Because you use metadata to persist and query data, development time decreases and productivity increases. Prototyping: Using an ORM framework is extremely useful for quick prototyping. Maintainability: Because much of the work is done through configuration, your code has fewer lines and thus requires less maintenance.

1. I was once interviewing for a contract C# programming position when the human resources interviewer asked me how much experience I d had programming in see pound (instead of see sharp )! It took me a moment to realize what he was talking about.

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n the tradition of computer learning books of the past several decades, in this chapter you ll write a quick Hello World service to help you get an understanding of the basics of ALSB. During this process, you ll gain a fundamental understanding of the ALSB interface, how to create a project using the ALSB console, and more. You ll also see from end to end how to create and deploy business and proxy services on ALSB, along with how to create test clients to ensure that your services are working as desired. You ll follow these steps: 1. Use Workshop to create and deploy a web service that implements the business logic.

consistent and object-oriented environment than either the MFC or COM programming technologies. Some of its features include the following: Multiple platforms: The system runs on a broad range of computers, from servers and desktop machines to PDAs and cell phones. Industry standards: The system uses industry standard communication protocols, such as XML, HTTP, SOAP, and WSDL. Security: The system can provide a much safer execution environment, even in the presence of code obtained from suspect sources.

s Note ALSB supports interoperability between heterogeneous systems. It can connect to .NET, Apache Axis, WebSphere, and other web service platforms. However, for ease of development, you ll develop your web services using WebLogic Server (WLS).

The .NET Framework is made up of three components, as shown in Figure 1-2. The execution environment is called the Common Language Runtime (CLR). The CLR manages program execution at run time, including the following: Memory management Code safety verification Code execution Garbage collection The programming tools include everything you need for coding and debugging, including the following: The Visual Studio integrated development environment .NET-compliant compilers (e.g., C#, VB, JScript, and managed C++) Debuggers Server-side improvements, such as ASP.NET The Base Class Library (BCL) is a large class library used by the .NET Framework and available for you to use in your programs as well.

Vendor independence: An ORM abstracts an application from the underlying SQL database and SQL dialect. This gives you the portability to support multiple databases.

The .NET Framework offers programmers considerable improvements over previous Windows programming environments. A brief overview of its features and their benefits is given in the following sections.

2. Use Workshop to create a client for the web service created in step 1. 3. Create a HelloWorld project in ALSB. 4. Define the WSDL for the web service in ALSB, based on the web service you created in step 1. 5. Create a business service definition in ALSB, based on the WSDL. 6. Create a proxy service in ALSB based on the business service. 7. Create a test client for the proxy service to confirm that everything runs properly, end to end. Before you proceed, be sure that the alsb_book domain is running.

The CLR, the BCL, and C# are designed to be thoroughly object-oriented and act as a wellintegrated environment. The system provides a consistent, object-oriented model of programming for both local programs and distributed systems. It also provides a software development interface for desktop application programming, mobile application programming, and web development, consistent across a broad range of targets, from servers to cell phones.

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