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Being Aware of Multiple Types The example implementation of sending and retrieving .NET object instances and converting them to XML documents is simple and logical. The deficiency of the example is that the task manager can process only a single task type. It is not possible to process multiple task types. The reality is different because there will be multiple task types to execute. To avoid processing multiple task types with a single instance of the Persistent Communications pattern, you can instantiate multiple ClientCommunicator instances. The result of multiple ClientCommunicator instances is multiple streams. And multiple streams waste resources, as defined in the explanation of the Persistent Communications pattern. The solution must be a single stream, where the server has to be able to distinguish between different XML document types. The problem of recognizing multiple XML document types is figuring out how to transform XML into a class instance. The problem of converting an XML document into a class instance and vice versa is a wellunderstood problem in .NET and Java. The solution is to use a metadata description language that a mapping tool can use. In XMLspeak, this means using XML schemas. In a nutshell, XML schemas are XML files used to describe the XML elements of a document. XML schemas are beyond the scope of this book, but they are extremely useful when writing Ajax applications that exchange XML data. Let s revisit the XML document sent by the client to the server and go through an example of defining a transformation using XML schemas: <Action> <TransactionIdentifier>1_101</TransactionIdentifier> EBVN <Number>20</Number> </Action> The XML document has the root element Action and two child elements: Number and TransactionIdentifier. The XML document converted into an XML schema is illustrated as follows: < xml version="1.0" encoding="UTF-8" > <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"> <xs:element name="Action"> <xs:complexType> <xs:sequence> <xs:element ref="TransactionIdentifier"/> <xs:element ref="Number"/> </xs:sequence> </xs:complexType> </xs:element> <xs:element name="Number" type="xs:string"/> <xs:element name="TransactionIdentifier" type="xs:string"/> </xs:schema> The XML schema is another XML document, and the elements are used, and their structure is targeted, but their meaning is relevant only to an XML schema parser. Looking at the XML schema, the identifier element is used as a cross-reference with an XML element in a document. There are three first-level child elements, which directly correspond to the XML
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CHAPTER 10 INFINITE DATA PATTERN
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elements in the document. Each of the first-level child elements has an attribute name, used to identify the name of the XML element in an XML document. The attribute type is used to define the type of an XML element in an XML document. If an XML element contains child elements of type complexType, an XML structure is being defined. Otherwise, the referenced XML elements are simple types, where the type can be defined using the XML schema specification (for example, the type xs:int for the Number schema definition). The XML schema is then used as a script for a tool to generate source code that manages the serializing and deserializing of XML documents. For .NET, the xsd.exe command-line utility is used, and for Java, Java Architecture for XML Binding (JAXB) is used. To convert the example XML schema into a set of .NET classes, the command xsd.exe ActionData.xsd /classes is executed and generates the following source code: using System.Xml.Serialization; [System.SerializableAttribute()] [System.Xml.Serialization.XmlTypeAttribute(AnonymousType=true)] [System.Xml.Serialization.XmlRootAttribute(Namespace="", IsNullable=false)] public partial class Action { private string transactionIdentifierField; private string numberField; /// <remarks/> public string TransactionIdentifier { get { return this.transactionIdentifierField; EBVN } set { this.transactionIdentifierField = value; } } /// <remarks/> public string Number { get { return this.numberField; } set { this.numberField = value; } } } In the generated source code, the class name and properties directly correlate to the XML elements in the XML document. The class name is Action because the root XML element is Action. Associated with the class are a number of .NET attributes that are used for XML serialization. The generated types are used by the serialization methods that were defined as an abstracted method in the Sending Tasks and Retrieving Results sections (Serialization. Generate, Serialization.Parse). The infrastructure used to perform the serialization of the XML documents is implemented very differently on Java and .NET. And if there are multiple types to serialize and deserialize, the process of serialization becomes more complicated. In general, to be able to parse multiple
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