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08 </interceptors> 09 10 </interceptor-pointcut> The XML tags in Listing 9-4 define the class (see line 3) that the interceptor is applied to (see line 6). The methodFilter, fieldFilter, and constructorFilter parameters define the pointcut; in this case, only the methods are advised. Note that because of these parameters, the first if of the invoke method is not needed. Since no consistency checks are performed on the interceptor type by JBoss AOP, the if test can be kept to make sure that the interceptor works only on methods even if a pointcut tries to apply the interceptor to something else. Finally, after the program is compiled and correctly parameterized, the execution gives the results that are shown in Listing 9-5. Listing 9-5. The Execution Trace with the Precondition Interceptor sqrt of 4 : 2.0 sqrt of 0 : 0.0 java.lang.Error: Unfulfilled precondition ... Exception in thread "main" When the precondition is not fulfilled, the program cannot continue its execution unless some conflict-resolution strategy is explicitly implemented. This behavior is better than the default. Note that you can activate and deactivate the precondition without any recompilation by modifying the jboss-aop.xml file.

If you use the @WebMethod annotation on an endpoint interface, your server will ignore it and expose all methods of the endpoint interface in the web service.

If you have multiple methods in the bean class and there are methods that you don t want to expose in the web service, you can set the exclude element to true as follows:

public abstract class PortfolioBean implements EntityBean { abstract public String getPortfolioName(); abstract public void setPortfolioName(String val); abstract public double getCashValue(); abstract public void setCashValue(double val); abstract public Owner getOwner();

@WebService(endPointInterface = "PlaceBidSEI") @Stateless public class PlaceBidBean { public Long addBid(..) { } @WebMethod(exclude = "true") public Long persistBid(..) { } }

Postconditions often access more data than preconditions. This data includes: The result of the invoked method The values of the parameters object attributes before and/or after the execution of the invoked method The implementation of postconditions is illustrated by the example which purposely contains a bug that is shown in Listing 9-6. Listing 9-6. An Example of an Incorrect Increment Function package aop.contracts.postconditions; public class PostConditionExample2 { public int increment(int p) { return p++; }

Using this technique, the persistBid method will not be exposed in the web service when the PlaceBid EJB web service is deployed. You can use the operationName and action elements in the @WebMethod annotation to specify the operation and SOAP action, respectively, as in the following example.

abstract public void } setOwner(Owner owner);

@WebMethod(operationName = "addNewBid", action = "http://actionbazaar.com/NewBid") public Long addBid(...) { }

The operationName, as defined above the addBid method, will generate the following WSDL:

Since the relationship has already been modeled in recipe 3.8, we need only add the cascade delete tag, <cascade-delete/> , to the deployment descriptor, as shown in listing 3.21.

public static void main(String[] args) { PostConditionExample2 t = new PostConditionExample2(); System.out.println("incr mente 1 : "+t.increment(1)); } } The body of the increment method should be return ++p;. For this method, the postcondition is implemented by the interceptor that is shown in Listing 9-7. Listing 9-7. A Postcondition Interceptor for the Increment Function package aop.contracts.postconditions; import java.lang.reflect.Method; import import import import import org.jboss.aop.Interceptor; org.jboss.aop.Invocation; org.jboss.aop.InvocationResponse; org.jboss.aop.InvocationType; org.jboss.aop.MethodInvocation;

Notice how the actual method name is addBid but the method named exposed in the web service is addNewBid. You can use this to help map the service contract to the actual implementation. Even if that implementation changes over time, the contract can remain intact. If the operationName isn t specified, it will default to the implementation name of the method. Similarly, the action element we defined earlier will be used for generating the SOAPAction in the WSDL as follows:

<operation name = "addNewBid"> <soap:operation soapAction = "http://actionbazaar.com/NewBid"/> ... </operation>

The SOAPAction element determines the header element in the HTTP request message. It is used by the web service client when communicating with the web service using SOAP over HTTP. The content of the SOAPAction header field is used by the endpoint to determine the true intended destination rather than having to parse the SOAP message body to find this information. This section gave you a tour of the @WebMethod annotation so you know how to define the method name for a web service. Next we ll look at how to define parameters for our new web methods with the @WebParam annotation.

<ejb-jar> <enterprise-beans> . . . . . . </enterprise-beans> <assembly-descriptor> <relationships> <ejb-relation> <ejb-relation-name>Owner-Portfolio</ejb-relation-name> <ejb-relationship-role> <ejb-relationship-role-name> Owner-Has-Portfolios </ejb-relationship-role-name> <multiplicity>one</multiplicity> <relationship-role-source> <ejb-name>OwnerEJB</ejb-name> </relationship-role-source> <cmr-field> <cmr-field-name>portfolios</cmr-field-name> <cmr-field-type>java.util.Collection</cmr-field-type> </cmr-field> </ejb-relationship-role> <ejb-relationship-role> <ejb-relationship-role-name> Portfolio-Has-Owner Indicates the </ejb-relationship-role-name> relationship supports <multiplicity>many</multiplicity> cascade deletes <cascade-delete/> <relationship-role-source> <ejb-name>PortfolioEJB</ejb-name> </relationship-role-source> <cmr-field> <cmr-field-name>owner</cmr-field-name> </cmr-field> </ejb-relationship-role> </ejb-relation>

public class PostConditionInterceptor implements Interceptor { public String getName() { return "PostConditionInterceptor"; } public InvocationResponse invoke(Invocation invocation) boolean incrementInvocation = false; int incrementParameterValue = 0; throws Throwable {