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} return ejbh; } /** * Method called to locate web service for a particular * manufacturer. In this case, Only one is implemented. */ public EJBObject getWebService( String machineName ) { try { String className = Amaya s web service bean CommonIssues.class.getName();
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Properties prop = new Properties(); Configures prop.put( Context.INITIAL_CONTEXT_FACTORY, WebLogic SOAP "weblogic.soap.http.SoapInitialContextFactory"); prop.put( "weblogic.soap.wsdl.interface", className ); prop.put( "weblogic.soap.verbose", "true" ); // Register encoding types CodecFactory cf = CodecFactory.newInstance(); cf.register( "http://schemas.xmlsoap.org/soap/encoding/", new SoapEncodingCodec() ); cf.register( "http://xml.apache.org/xml-soap/literalxml", new LiteralCodec() ); cf.register( "http://schemas.xmlsoap.org/soap/encoding/", new LiteralCodec() ); cf.register( "http://xml.apache.org/xml-soap/literalxml", new SoapEncodingCodec() ); prop.put( "weblogic.soap.encoding.factory", cf ); Context ctx = new InitialContext( prop ); CommonIssues webService = (CommonIssues)ctx.lookup ("http://localhost/issues/CommonIssues/CommonIssues.wsdl"); return webService; Looks up web service } catch (SoapFault fault) { System.out.println("Soap fault generated: " + fault); fault.printStackTrace(); } catch (Exception e) { System.out.println("Error in getWebService." + e.getMessage()); } return null;
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This code is called only once to cache the naming context in the instance of this class. It reads JNDI connection properties from a file named jndi.properties, which is found on the classpath. Tests the static variable that indicates whether an instance has already been created. If it has, then returns it. If not, creates an instance and then returns it to the caller.
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The implementation phase
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This method is responsible for remote lookups of our bean homes. It locates a named object using the specified parameter and, if such an object is found, returns a reference to it. The CommonIssuesBean is responsible for receiving web service calls at Amaya and returning the latest information. Important details about the ComponentLocator The getWebService method in the ComponentLocator class is the first piece of code that explicitly references WebLogic classes. In chapter 4, section 4.3.1, we discussed the architecture of an RPC-style web service. It involves using a stateless session bean to call a servlet that handles the SOAP communication with the web service. In our implementation, WebLogic has provided an implementation of that servlet in the weblogic.soap.servlet package. It shields the developer from much of the detail requiring the simple calling code that is listed in our method. If you were to port this code to another application server or choose to use another SOAP server, this code would have to be modified. There are two other lines in the getWebService method that require further explanation. The first line in the method refers to a class called CommonIssues. There are two methods for invoking an RPC-style web service. You may use a static client to invoke a web service if you have the interfaces to the EJB, parameters, and return types associated with the web service. If not, you may write a dynamic client, which does not explicitly reference those classes in your code. In our case, Amaya implemented their web service using a stateless session bean called CommonIssuesBean. They have provided us with the interface and as a result, we have written our getWebService as a static client. Our reference to the CommonIssues class is a reference to the remote interface of their bean. Finally, we provide a URL for Amaya s web service. The URL begins with http://localhost. This enables you to run the case study on one machine. As we will see when we deploy the application, the Amaya web service is running as a separate application. If you choose to deploy that portion of the application to another machine, merely change the URL in the ComponentLocator class to point to the appropriate location for the WSDL.
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Building the BugAccessorBean
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The BugAccessorBean is responsible for accessing our partner web services and updating the list of common problems associated with each computer we repair. It uses the ComponentLocator to locate the web service and then requests the
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