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The right side shows the situation in AOP. An aspect uses the nonfunctional service and integrates it into an application. Contrary to OOP, the application no longer depends on the service it is the aspect that depends on the application. This change in the direction of the links between the service and the application is not specific to AOP; it is sometimes the case for frameworks, as well. The principal advantage of this inversion is that it makes the work of the application developer easier. With AOP, the application developer does not need to worry about the nonfunctional services. It is the aspect developer who, in addition to writing the code of the service itself, manages the integration of that service into the application. The advantage is that the specialized aspect developer has a better understanding of the service than the application developer, who is only a user of this API. This lowers the risk of a service being used incorrectly. In particular, the aspect developer can make sure that the service integration is correct by implementing some constraints on the way the service can be used.

Figure 13.6 The skeleton in the EJB server gives out a stub to the client. This stub is used by the client to communicate with the EJB remotely.

<relationships > <ejb-relation > <ejb-relation-name>OwnerToData</ejb-relation-name> <ejb-relationship-role > <multiplicity>One</multiplicity> <relationship-role-source > <ejb-name>ch2.Owner</ejb-name> </relationship-role-source> <cmr-field > <cmr-field-name>data</cmr-field-name> </cmr-field>

As evident from figure 13.6, the client stub has the information on how to communicate to the remote EJB server. Most application servers automatically generate the client stub while looking up an EJB remotely. This information is commonly based on the JNDI environments, which are populated while creating the InitialContext. You typically provide this in a jndi.properties file. If you remember our discussion from chapter 1, you provide the URL for the server that hosts the EJB we are accessing. Again, because EJB clustering is considered a proprietary enhancement, each application server implements it in its own way. That way, the application server knows the load-balancing algorithm and the servers being load-balanced. An example of this appears in figure 13.7. A remote EJB lookup requires that you specify a JNDI provider URL for a JNDI server. The client looks up the EJB and downloads the client stub. The stub contains information about all the servers being load-balanced, as well as the loadbalancing algorithm being used. Once more, check your vendor documentation for the various JNDI properties that you need for creating the InitialContext. You may have to do some configuration in your EJB applications to enable load balancing between different application server instances. If you want to use load balancing for stateless session beans, as a developer you ll have to do the following:

Figure 13.7 The stub that is downloaded by the client is instrumented with the load-balancing algorithm and has knowledge of the load-balancing servers.

Like AOP, frameworks show dependency inversion, as previously described, whereby the code of the application does not depend on the library. A framework1 is a set of classes that offers a reusable structure for writing applications. Frameworks are used in numerous areas of application development, especially user interfaces. A J2EE application server can be considered a framework that manages the execution of applications based on web or Enterprise JavaBeans (EJB) components. Developing an application with a framework consists of writing code that is handled by the framework. This code is not run directly instead, the framework invokes it according to the context. In other words, the framework forms a set of services that extends the code that you write. The situation is similar with AOP. Services are provided by aspects that extend the business layer of the application. The difference is that frameworks provide a set of fixed services, whereas those provided by AOP are entirely programmable within the aspects. AOP therefore offers a much more general mechanism for dependency inversion than frameworks, which are limited to the application domain that they were initially conceived for.

</ejb-relationship-role> <ejb-relationship-role > <multiplicity>One</multiplicity> <relationship-role-source > <ejb-name>ch2.DataBean</ejb-name> </relationship-role-source> </ejb-relationship-role> </ejb-relation> </relationships>

Build a remote interface for your stateless session bean and expose the appropriate methods in the remote interface. Reduce the number of method invocations by using a coarse-grained session bean. Make appropriate configurations using the vendor-specific deployment descriptors if required. Because the client code for the EJB needs to know that you are using clustered application server instances, provide the URL for the clustered JNDI server or application server.