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Application Server Web Container Browser Client Application Apache SOAP Client API Administration Application Apache SOAP Engine Type Mapping Registry Service Implementation
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The major disadvantage of Apache SOAP is that it uses a DOM-based XML parser, which is not well suited for large XML documents because it causes poor performance when large documents are processed. IBM has deprecated Apache SOAP in favor of the second choice, which we are about to discuss. This second SOAP engine uses a SAX parser for improved performance. The second implementation approach is based on an API known as Java API for XML Remote Procedure Call (JAX-RPC). This API allows all clients to use javax.xml.rpc.Call instead of a specific implementation such as org.apache.soap.rpc.Call. We discuss this API in detail later in this section. It is expected that all future Web Services implementations will provide interfaces based on the JAX-RPC standard. To address some of the shortcomings of the Apache SOAP engine, the Apache organization decided to develop a new SOAP engine. It is called Apache eXtensible Interaction System (Axis). The most important new aspect of this SOAP engine is that it uses a SAX XML parser instead of a DOM XML parser. The SAX parser provides performance advantages when dealing with large XML documents. Axis also supports many extensions to provide for different invocation mechanisms and protocols. The basic structure of Axis is shown in Figure 15.2. The figure shows that the Axis architecture is highly modular. Different handlers, which process different SOAP headers, are connected in chains. The handler chains can be defined at different levels, such as the transport, global, and service levels. It is important to note that the Axis engine can be
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J2SE or J2EE Container
Service Request Handlers Global Request Chain Transport Request Chain Transport Request Chain
J2EE Container
Global Request Chain Service Request Handlers Web Service
Client Application
JAXRPC
Axis Engine
Sender
network
Listener
Axis Engine
Dispatcher
Transport Service Global Response Response Response Handlers Chain Chain
Transport Service Global Response Response Response Handlers Chain Chain
Apache Axis structure overview
used both in the role of service requester and service provider. This dual-purpose engine provides the benefit of using similar implementations for tasks such as XML encryption, XML signature, and authentication on both the service provider and service consumer sides. Next we discuss the JAX-RPC API is detail. The Java API for XML Remote Procedure Call (JAX-RPC) includes a standard interface for developers to use when building both the client-side service requesters and the server-side service providers. JAX-RPC also defines the contract between a Web Service runtime container and a service implementation. A schematic view of JAX-RPC is shown in Figure 15.3.
J2SE JAX-RPC Client Side Runtime
J2EE Container JAX-RPC Server Side Runtime Service Endpoint
Service Interface Service Client Service Object (Factory)
Service Endpoint Interface
Service Endpoint Interface Service Endpoint Implementation
Client Stub
Network
JAX-RPC implementation view
Web Services Implementation
TABLE 15.1
JAX-RPC Terms Description A collection of artifacts that provides the implementation of the service provider A Java interface that de nes all the methods exposed by the Web Service. This interface extends java.rmi.Remote. A Java class that provides the implementation of the service and implements a service point interface A Java interface that extends javax.xml.rpc.Service. It de nes the factory methods to instantiate the service end point interface. A Java class that provides the implementation of the factory methods and implements the service interface A vendor-supplied class that provides a client-side stub for the service end point interface A Java class that calls the Web Service and is portable between JAX-RPC implementations
New Term Service end point Service end point interface Service end point implementation Service interface Service object Client stub Service client
This figure introduces a number of new terms related to JAX-RPC. The meanings of these terms are summarized in Table 15.1. Almost all artifacts in this table are generated by the deployment tools provided with any JAX-RPC runtime. The exceptions are the service client and service end point implementations. The JAX-RPC specification also defines a second invocation mechanism known as the dynamic invocation interface (DII). The clients of DII use the service object to dynamically create an instance of a service end point interface. The methods and parameters of this interface can be discovered at runtime through inspection. The JAX-RPC specification for Web Services has been extended for J2EE and is known as JSR 109. JSR 109 is an extension specification that defines how service definitions are declared within a J2EE application. A major advantage of using a J2EE container is that it allows the use of the JNDI naming service. This eliminates the need for the service consumer to invoke the service object factory class directly. Instead of using the factory class directly, the client applications use JNDI to look up the service reference. This ensures that the service client is completely portable between JSR-compliant runtimes. In addition, JSR 109 defines both the client and server Web Service deployment descriptor formats. The files for these deployment descriptors are webservicesclient.xml and webservices.xml. These files define the JNDI service reference for the service client and the location of the service end point implementation for the service provider. The JSR 109 structure is shown schematically in Figure 15.4.
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