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In the last four chapters, we discussed the various standards that constitute the Web Services. In this chapter, we discuss how these standards are put to use in developing Web Services. In particular, we will employ XML, the related XML schemas, WSDL, and SOAP for developing these services. Because all the messages in the Web Services are exchanged through SOAP, we start with a discussion of the two major choices for a SOAP engine. A SOAP engine is simply a framework for constructing SOAP processors such as clients, servers, and gateways. These two choices are Apache SOAP 2.3 and the JAX-RPC implementation, which includes the Apache Axis engine. JAX-RPC stands for Java API for XML remote procedure call. In this chapter, we only briefly discuss the Apache SOAP engine because the use of this engine has been deprecated due to poor performance when large documents are involved. This poor performance is the result of the use of the DOM parser in the Apache SOAP engine. Next, we discuss the JAX-RPC implementations of the SOAP engine, including the Apache Axis engine. The Axis engine employs the SAX parser instead of the DOM parser in order to obtain much better performance when large XML documents need to be processed. Another advantage of the JAX-RPC implementation is that the structure of the SOAP engine is highly modular, as you will see in the next section. We also discuss JSR 109, which is an extension of the JAX-RPC specification to the J2EE environment. After discussing SOAP engines, we turn our attention to the main subject of this chapter how to develop Web Services and their clients. For this purpose, one of two approaches is usually employed: the topdown approach or the bottom-up approach. In the top-down approach, a WSDL document containing the Web Service description is constructed first and then an automated tool is used to generate the code both for
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the client side and the server side. The top-down approach is the recommended approach for developing Web Services, and we will discuss this approach in detail, including the various files generated by the automated tool. In the bottom-up approach, Java classes or EJBs are developed first and then automated tools are employed to expose these classes as Web Services. These tools also generate the required WSDL documents. We will only briefly mention this method of developing Web Services because it is not the recommended approach for constructing Web Services. We will deal only with Java-based services because Java is the most common environment for developing services. However, it should be noted that there are other ways of developing Web Services, including services based on .NET or C++. Finally, at the end of this chapter, we discuss some of the commercial tools available for developing services. Implementation Choices When it comes to implementing Web Services and their clients, you first must choose a SOAP engine. A SOAP engine is a framework for constructing SOAP processors such as clients, servers, gateways, and so on. In general, the two most common choices are
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Apache SOAP 2.3 The JAX-RPC implementation, including Apache Axis.
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The Apache SOAP 2.3 is based on IBM s donated code for SOAP4J. This code was donated to the Apache Foundation by IBM. It includes an implementation of SOAP 1.1, and has been used in the past as the core SOAP engine for a number of past WebSphere releases. Figure 15.1 shows the architecture for Apache SOAP. The engine provides two servlets that are deployed in the application server s web container. One of the servlets handles RPC-style calls whereas the other handles messaging-type calls. The servlets call the SOAP engine, which looks for the name of the configuration manager in the file soap.xml. The default configuration manager provided with the distribution is org.apache.soap.server.XMLConfigurationManager. The manager is designed to look for the file dds.xml, which is the deployment descriptor for the services implemented in the web application. A graphical interface is also provided to simplify the maintenance of this file through a browser. The Apache SOAP distribution also provides a client API, which is based on the class org.apache.soap.rpc.Call. This API provides a simple mechanism for the developer to use when creating RPC-style SOAP requests without requiring the developer to understand the schema for the SOAP message in any detail.
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