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Web Services Technology Projection GLUE, the CLIENT PROXY can also be generated on the fly (see the discussion of GLUE on page 281).
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wsdlDate.ws Interface SimpleDate String getDate() throws RemoteException String getDate(String) throws RemoteException
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Interface, Remote Object SimpleDate String getDate() String getDate(String)
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1 Invoker WsdlDateSoapBindingImpl proxy for Client Proxy WsdlDateSoapBindingStub
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The interface SimpleDate is the interface provided remotely. It is implemented by the server side binding and the generated CLIENT PROXY. The interface s operations throw a REMOTING ERROR (here a java.rmi.RemoteException). The generated package on the server side provides classes to be used by the INVOKER. WsdlDateSoapBindingImpl implements the interface described in the WSDL file. It does not contain the Web Services implementation, but uses wrapper methods that simply forward invocations to the Web Services implementation. This class is hooked into the INVOKER using the RPC provider see the following sections. Besides this class, two XML files are generated: deploy.wsdd to deploy the Web Service, and undeploy.wsdd to undeploy the Web Service from the Axis engine.
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On the client side, WsdlDateSoapBindingStub contains a SOAP-based implementation of the CLIENT PROXY interface. SimpleDateService contains an interface to access the service from the client. That means in particular that it provides a factory for the SimpleDate CLIENT PROXY interface. SimpleDateServiceLocator contains an implementation of the CLIENT PROXY factory that creates objects of the type WsdlDateSoapBindingStub. The resulting runtime architecture and the interfaces and implementations used in this architectures are depicted in the figure below.
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Interface: wsdlDate.SimpleDate Implementation: wsdlDate.SimpleDateImpl Client Client Application Server Remote Object Implementation
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Axis Framework
Axis Framework
Network Interface: wsdlDate.ws.SimpleDate Implementation: wsdlDate.ws.WsdlDateSoapBindingImpl Interface: wsdlDate.ws.SimpleDate Implementation: wsdlDate.ws.WsdlDateSoapBindingStub
To create these files automatically, we have to invoke the WSDL2Java tool:
java org.apache.axis.wsdl.WSDL2Java -o . -d Session -s -p wsdlDate.ws wsdlDate/Date.wsdl
On the client side, a simpler client than the dynamic invocation client from the previous section can be implemented that abstracts from most
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Web Services Technology Projection of the distribution details. The following client code instantiates the factory, creates a CLIENT PROXY, and performs two remote invocations:
package wsdlDate; public class DateClient { public static void main(String [] args) throws Exception { wsdlDate.ws.SimpleDateService service = new wsdlDate.ws.SimpleDateServiceLocator(); wsdlDate.ws.SimpleDate dateProxy = service.getwsdlDate(); System.out.println(dateProxy.getDate()); System.out.println(dateProxy.getDate("dd-MM-yyyy")); } }
The use of INTERFACE DESCRIPTION in Axis and other Web Services frameworks combines the benefits of using reflective code as a local interface repository with INTERFACE DESCRIPTIONS that can be sent to the client. WSDL is mainly used for providing interoperability and platform independence of Web Services implementations. With a WSDL description of a Web Service say obtained with a lookup service such as UDDI, or downloaded from the server the developer can generate a CLIENT PROXY that also works with Web Services frameworks or programming languages other than Axis/Java. In this way, for example, a .NET Web Services client can access the Web Services implementation written in Axis/Java. Hence most Web Services frameworks generate WSDL code dynamically from a deployed Web Service and offer this WSDL code to be downloaded by remote clients.
Message processing in Axis
Now that we have looked at the implementer s view of REQUESTOR, CLIENT PROXY, and INVOKER, let s explore the internal message processing architecture of Axis. There are many tasks to be performed within a Web Services REQUESTOR and INVOKER, both for the request and reply of an invoked service: Within the REQUESTOR, the invocation has to be constructed, marshaled as an XML message, and handed to the CLIENT REQUEST HANDLER. When the reply has arrived, it has to be obtained from the CLIENT REQUEST HANDLER, de-marshaled, and handed back to the client.
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Message processing in Axis
Within the server-side INVOKER, the invocation has to be received from the SERVER REQUEST HANDLER, a MARSHALLER has to be demarshal the SOAP XML text, the service has to be looked up and invoked, the reply has to be marshaled again as SOAP XML text, and it has to be handed back to the SERVER REQUEST HANDLER. Invocations can either use a REQUESTOR-based invocation scheme (as in the first example above) or a CLIENT PROXY-based invocation scheme (as in the second example above using WSDL). Within both REQUESTOR and INVOKER there are many add-on tasks, for example integration with the access control mechanisms of the Web Server, logging, session handling, and many more. There are several things we can observe: There are many different, orthogonal tasks to be performed for a message. There is a symmetry of the tasks to be performed for request and reply. The three tasks, mentioned above, occur on client side and server side. The invocation scheme and add-ons have to be extensible flexibly. These forces are addressed in the Axis architecture by a combination of REQUESTOR, INVOKER, INVOCATION CONTEXT, INVOCATION INTERCEPTOR, and CLIENT/SERVER REQUEST HANDLER. This message processing architecture is used both on client side and server side in its client and server variant, respectively. The basic idea is to construct the messageprocessing scheme and any add-on service as chained handlers. Handlers are ordered in a chain, and each invocation has to pass each handler in the chain, before it reaches the actual remote object. Each handler supports an operation invoke that is executed when an invocation passes it (which means that the handler implements the pattern Command [GHJV95]). The handler chain is used to implement an INVOCATION INTERCEPTOR architecture, similar to the architecture described in [Vin02b]. Each handler provides an operation invoke that implements the handler s task. This operation is invoked whenever a message passes the handler in the chain. A message can pass a handler either as a request or a reply, both on the client side and the server side. That is, the REQUESTOR passes each request message through the client-side