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flexibility. Otherwise, any changes to this common authorization logic would have to be replicated across all the JSP front controllers. A client who was using eInsure in production submitted some enhancements. They wanted to prevent access to the application beyond the scheduled office hours of 9 a.m. to 6 p.m. This would let them use this downtime to run scheduled batch programs more efficiently. In addition, they wanted to track and analyze the usage pattern of the web site. Last but not least, they wanted a configurable monitor to track the time spent by individual page controllers in fulfilling a request. This would be turned on from time to time to check system performance. The typical approach in this case would be to create some new components and change some existing ones. But this is risky as new bugs can be added to the existing codebase. A careful analysis of these new requirements reveals that they can best be addressed by applying new reusable components before and after the existing code. It should be possible to configure and apply these components transparently without affecting the existing code. This would save lot of time and effort if existing components had to be altered.

When writing unit tests, our goal is to introduce the minimum set of dependencies required to implement a particular test If we are testing a business method that needs to invoke a method on the EJBContext interface, we should worry only about providing a stubbed version of the interface If the bean uses a data source but is not relevant to our testing, then ideally we want to ignore it entirely Dependency injection is the key to effective unit testing By removing the JNDI API from session bean code and eliminating the need for the Service Locator pattern, you can ensure that the bean class has few dependencies on the application server We need only instantiate the bean instance and manually inject the required resources, the majority of which will be either other beans from the application or test-specific implementations of a standard interface.

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As we explained in 3, the setter injection form of dependency injection is the easiest to use in unit tests Because the setter methods are almost always public, they can be invoked directly by the test case to assign a dependency to the bean class Field injection is still easy to deal with so long as the field uses package scope because the convention for unit tests is to use the same package name as the class that is being tested When the dependency is another session bean, you must make a choice about whether all the dependencies of the required bean class must be met or whether a test-specific version of the business interface should be used instead If the business method from the dependent business interface does not affect the outcome of the test, it may not be worth the effort to establish the full dependency.

You want common processing to be centralized into reusable components. The preprocessing and postprocessing components should be loosely coupled to the existing application code. Apply common processing declaratively.

Summary

As an example, consider the session bean shown in Listing 14-3 We have shown a single method for calculating years of service for an employee that retrieves an Employee instance using the EmployeeService session bean Listing 14-3 Using the EmployeeService Bean in a Different Business Method @Stateless public class VacationBean implements Vacation { public static final long MILLIS_PER_YEAR = 1000 * 60 * 60 * 24 * 365; @EJB EmployeeService empService; public int getYearsOfService(int empId) { Employee emp = empServicefindEmployee(empId); long current = SystemcurrentTimeMillis(); long start = empgetStartDate()getTime(); return (int)((current - start) / MILLIS_PER_YEAR); } } // ....

Because the only thing necessary to verify the getYearsOfService() method is a single Employee instance with a start date value, there is no need to use the real EmployeeService bean. An implementation of the EmployeeService interface that returns an entity instance preconfigured for the test is more than sufficient. In fact, the ability to specify a well-known return value from the findEmployee() method makes the overall test much easier to implement. Listing 14-4 demonstrates using a test-specific implementation of a session bean interface. The implementation is defined as an anonymous class in the test class. Implementing an interface specifically for a test is called mocking the interface, and the instantiated instance is referred to as a mock object.

Use an intercepting filter to apply reusable processing transparently before and after the actual request execution by the front and page controllers.

Hibernate provides a simple API for creating, retrieving, updating, and deleting objects from the relational database through the Session interface. Understanding the difference between transient, persistent, and detached objects in Hibernate allows us to understand how changes to the objects update the database table. After learning how to manage objects with Hibernate in this chapter, the following chapter discusses how to create mapping files for Hibernate s object-relational mapping. We go into depth for querying objects with the criteria query API in 7, and how to use the Hibernate Query Language in 8.

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