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The StockTrader Web service has evolved in this chapter to where it delegates all requests to a business assembly (StockTraderBusiness). If a client contacts the Web service to request a stock quote, the Web service delegates the request to the business object s RequestQuote method. The Web service does not know or care how this method returns a stock quote, but it does expect to receive one every time it makes a request. For the next evolution of the StockTrader Web service, your company signs a partnership agreement with another company that is a premier provider of stock quotes. You decide that going forward the StockTraderBusiness assembly will delegate all stock quote requests to this external service. The StockTrader Web service will continue to delegate requests to the business assembly, but the business assembly, in turn, will delegate the requests again, this time to an external Web service. You decide to build a service agent to minimize any change to the business assembly. Figure 4-7 shows the Solution Explorer for the solution that you are going to build, with selective References nodes expanded so you can see the relationships between the different components.

Multiple redirections can also be used. In the following short example the code takes the contents of the /etc/hosts file as input to the while loop:

Build the XSD Schema File (Step 2)

The loop adds line numbers to the file and the final output is then redirected to the lined.hosts file.

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Once you have established what your XML messages and data types will look like, it is time to start building them. XSD schema files are the building blocks for XML messages, so you need to design the schema files first. XSD schema files may be coded by hand, but it is easier to use a visual designer tool, such as Visual Studio .NET s XML Designer. To access the designer, you simply add a new XSD schema file to a project. Visual Studio provides both a visual design view and an XML design view. Figure 3-3 illustrates the visual design view for StockTrader.xsd, which defines all of the data types for this chapter s StockTrader sample application.

Figure 4-7. Solution Explorer for the StockTrader SOA application, including a service agent The five components in this application are as follows: 1. StockTraderConsole2: The client application, providing a user interface 2. StockTraderBusiness: The middle-tier business component that handles processing for the client

In most programming languages, you can open a file descriptor for reading, writing, or both, then read or make modifications to the data and close the file. Shell scripting languages are no exception. Up to now, I have discussed redirection only of output to a given file or to one of the standard input or output file streams. Now I ll discuss the method of opening a file handle for a specific type of operation (read/write/both), but instead of opening the file each time you want to access it, you create a file handle with a userdefined file descriptor that can then be accessed in various modes, using the same syntax as the standard input/output descriptors. You create a handle for a specified file via the exec command. When opening the file, you give it a single-digit file descriptor in the range of 3 9 to avoid conflict with the standard stream descriptors of 0 2.

The XML Designer includes toolbox elements that you can drag onto the surface of the designer and then fill in, as shown in Figure 3-4. For example, it provides a toolbox element for XML complex types. Simply drag this element onto the designer and provide a name for the complex type. Then start specifying the included types by their name and type. Once you are finished defining all of the types, switch to the XML view to view the resulting XML. You can then copy and paste the XML into a notepad file, and save it with an .xsd extension.

Any combination of the following exec commands can be used in your code to open a file and assign it a single-digit file descriptor: exec 3> file_1: Opens file_1 for output in overwrite mode, which would then be accessed with file descriptor 3. exec 4< file_2: Opens file_2 for input in read mode, which would then be accessed with file descriptor 4. exec 5>> file_3: Opens file_3 for output in append mode, which would then be accessed with file descriptor 5. exec 6<> file_4: Opens file_4 for both reading and writing, which would then be accessed with file descriptor 6. Unlike the other examples, where you must access the files in the same way the descriptors were opened, for either reading or writing, this type of descriptor can be accessed in both ways. Once the file descriptors are open, you can access them with various input or output statements. To access a specific open file descriptor, complete an expression with the syntax >&fd, where fd denotes the single-digit descriptor. Here are some examples of reading and writing to open files:

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