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return this; } }); In this snippet we modified our Caller class to use the Events mixin via Implements. We then added two calls to fireEvent, the first right after setting the busy property to true to dispatch the callStart event, and the second inside our delayed function to dispatch the callEnd event. In both invocations we passed the name variable as the second argument, which in turn will be passed to the event handlers. Dispatching the events, though, is only half of the story. Even if our Caller class now has the ability to broadcast events, those events are useless unless they re heard. And that s where event handlers come in. An event handler is a function that listens to a class, waiting for a particular event to happen. When an event is dispatched, the event handlers associated with the event are invoked. This is how the classes communicate. Event handlers are attached to the event dispatcher object. In our case, we need to attach our event handlers to the Caller instance. We can do this using the Events mixin s addEvent method, which takes two arguments: type, which is a string denoting the event name, and fn, which is the event handler function. var Caller = new Class({ Implements: Events, busy: false, call: function(name){ this.busy = true; this.fireEvent('callStart', name); (function(){ this.busy = false; this.fireEvent('callEnd', name); }).delay(5000, this); return this; } }); var Display = new Class({ callStart: function(name){ console.log('Calling ' + name); }, callEnd: function(){ console.log('End call to ' + name); } }); var Phone = new Class({

In this exercise, you will log in to Picasa Web Albums and view the default album(s) used by your Blogger blog(s): 1. 2. 3. 4. 5. From the Dashboard, under Other Stuff, Picasa Web Albums is listed under Tools and Resources. Click Picasa Web Albums or go to picasawebalbum.google.com. Log in using your Blogger password if you are prompted for it. Click Sign in. You will see one or two albums; one with the name of your blog (in our example, The Perfect Landscape ), and the other that says Blogger Pictures (see Figure 6-1).

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The most likely test candidate for entities is not the entity but the application code that uses the entity as part of its business logic. For many applications this means testing session beans, managed beans and other Java EE components. If the entities are obtained or initialized outside the scope of the component, testing is made easy in the sense that the entity class can simply be instantiated, populated with entity data and set into the bean class for testing. When used as a domain object in application code, an entity is no different from any other Java class. You can effectively pretend that it s not an entity at all. Of course, there is more to unit testing a session bean than simply instantiating entities to be used with a business method. We also need to be concerned with the dependencies that the session bean has in order to implement its business logic. These dependencies are usually manifested as fields on the bean class that are populated using a form of dependency injection or dependency lookup.

initialize: function(){ this.caller = new Caller(); this.display = new Display(); this.caller.addEvent('callStart', this.display.callStart); this.caller.addEvent('callEnd', this.display.callEnd); }, call: function(name){ this.caller.call(name); } }); Here we updated our Phone class s initialize method with two calls to the caller object s addEvent method. In the first invocation we attached the callStart method of the display object as the callStart event handler, and the second object does the same with the callEnd method, but for the callEnd event. The result is that our two separate classes can now communicate using events. Events are useful not only for classes but also for a host of other programming purposes. We ll learn more about events and event-based programming in 10.

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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