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3. StockTraderServiceAgent: The service agent used by the business component for communicating with external services 4. StockTraderTypes: The common type definition assembly, which is referenced by the three preceding components 5. StockQuoteExternalService: The external Web service If this gets confusing, you can consult either Figure 4-6 or Figure 4-7, which include all five of these components. Let s look at how to build each component in turn, going from bottom to top, in the order of the service request workflow, starting with the external StockQuoteExternalService Web service.

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You do not need to build the XML message documents by hand because they are created as part of the WSDL document, which Visual Studio .NET will automatically generate. But you will need to code the abstract method definitions in an interface definition file so that the WSDL generator knows what XML messages to create. The interface definition file contains type definitions and abstract method definitions.

I have matched the file-descriptor numerals (relating to input and output) with the exec commands that opened them originally. Using the exec syntax you can also specify your output at runtime instead of hardcoding it. The following example demonstrates the technique:

The External Web Service (StockQuoteExternalService)

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The interface definition class file contains two important sets of information: Class definitions for all custom types that are exchanged by the Web service Abstract class definitions for each operation that the Web service supports Listing 3-4 provides the code for an interface definition class file for the RequestQuote operation and its associated types.

If [ -n "$DEBUG" ] then exec 5>&1 else exec 5> $LOGFILE fi echo "Some Text" >&5

Based on the value of the DEBUG variable, the code sends output from file descriptor 5 either to stdout or to a log file.

Listing 3-4. The Interface Definition Class File for the RequestQuote Operation and Its Associated Types

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StockQuoteExternalService is a simple Web service that provides a single Web method for requesting stock quotes (RequestQuoteExt), and it returns its own equivalent to the StockTraderTypes.Quote type, which is named QuoteExt. The Quote and QuoteExt types are equivalent, but they differ from each other in three ways: 1. The QuoteExt type conforms to a different qualified namespace from the Quote type. Each type conforms to its own XSD schema file. 2. The QuoteExt type does not contain equivalents to the Quote type s Change and Percent_Change properties. 3. The QuoteExt type provides a time stamp property named DateTime_Ext, which is of type System.DateTime. The Quote type provides an equivalent time stamp property named DateTime that is of type String. These are admittedly minor differences, but they illustrate the point. When you call an external service, it is unlikely that their type definitions will be equivalent to yours. You have to be prepared for some manual work to translate the differences. In real life, of course, you would not have to create the external service yourself, but for the purposes of this demonstration you do.

When file access is complete, you should close the open file with the exec command, as shown here:

using System; using System.Web.Services; using System.Web.Services.Description; using System.Web.Services.Protocols; using System.Xml.Serialization; namespace StockTrader { public abstract class StockTraderStub : System.Web.Services.WebService { public abstract Quote RequestQuote(string Symbol); } [XmlTypeAttribute(Namespace= "http://www.bluestonepartners.com/schemas/StockTrader/")] public class Quote { public string Symbol; public string Company; public string DateTime; public System.Double High; public System.Double Low; public System.Double Open; public System.Double Last; public System.Double Change; public System.Double PercentChange; public System.Double Previous_Close; public System.Double High_52_Week; public System.Double Low_52_Week; } }

exec 3>&-

Notice the following important points: The definition file includes one stub class that encapsulates all operations, and then any number of additional classes for the data types.

The Service Agent (StockTraderServiceAgent)

This keeps your code clean. In both bash and ksh you will receive a Bad file descriptor error if you attempt to access a file descriptor that hasn t been opened. There is no trouble with closing a file descriptor that is not already open.

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