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In fact, there are a lot of design flaws: The getChannel() method is polluted with code that has nothing to do with the business logic of the method. Not only has the developer added seven lines of code to the method, but he has also made the code a bit harder to read. It is difficult to turn auditing off and on since you have to comment out the code and recompile the bean class. This auditing logic is obviously a template that could be reused across many methods of your application. If this code is littered throughout your EJB methods, you would need to potentially modify a lot of different classes to expand the functionality. Interceptors define a much cleaner separation for business logic that may run across many modules in your system. They provide a mechanism to encapsulate this business logic and an easy way to apply it to your methods without making the code harder to read. Interceptors provide a structure for this type of behavior so that it can easily be extended and expanded in one class. Finally, they provide a simple, configurable mechanism for applying their behavior wherever you like.

lbl.Text += "   " + companyChild("CompanyName") + "<br />"

13. Add the following methods to the TraceMessageBehavior class:

The biggest difference between the stateful session bean and the other bean types is that stateful session beans do not use instance pooling. Stateful session beans are dedicated to one client for their entire lives, so swapping or pooling of instances isn t possible. When they are idle, stateful session bean instances are simply evicted from memory. The EJB object remains connected to the client, but the bean instance is dereferenced and garbage-collected during inactive periods. This means that each stateful bean must be passivated before it is evicted in order to preserve the conversational state of the instance, and it must be activated to restore its state when the EJB object becomes active again.

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' VB Public Sub AddBindingParameters(endpoint As ServiceEndpoint, _ bindingParameters As BindingParameterCollection) _ Implements IEndpointBehavior.AddBindingParameters End Sub Public Sub Validate(endpoint As ServiceEndpoint) _ Implements IEndpointBehavior.Validate End Sub Public Sub ApplyDispatchBehavior(endpoint As ServiceEndpoint, _ endpointDispatcher As EndpointDispatcher) _ Implements IEndpointBehavior.ApplyDispatchBehavior End Sub // C# public void AddBindingParameters(ServiceEndpoint endpoint, BindingParameterCollection bindingParameters) { } public void Validate(ServiceEndpoint endpoint) { } public void ApplyDispatchBehavior(ServiceEndpoint endpoint, EndpointDispatcher endpointDispatcher) { }

End Sub //C# protected void Button2_Click(object sender, EventArgs e) { //add a label to the form Label lbl = GetLabel(275, 20); //get the dataset and populate

Some vendors use pooling with stateful session beans, but that is a proprietary implementation and should not affect the specified lifecycle of the stateful session bean.

Now that the unused methods have been dealt with, look at the one that actually has some code in it. To add a message inspector to the client, you use the ClientRuntime object. This object maintains a collection of the inspectors to be used on the client side. 14. Add the following method to the TraceMessageBehavior class:

DataSet companyList = GetDataSet();

The bean s perception of its lifecycle depends on whether it implements a special interface called javax.ejb.SessionSynchronization. This interface defines an additional set of callback methods that notify the bean of its participation in transactions. A bean that implements SessionSynchronization can cache database data across several method calls before making an update. We have not discussed transactions in detail yet; we will consider this part of the bean s lifecycle in 17. This section describes the lifecycle of stateful session beans that do not implement the SessionSynchronization interface. The lifecycle of a stateful session bean has three states: Does Not Exist, Method-Ready, and Passivated. This sounds a lot like a stateless session bean, but the Method-Ready state is significantly different from the Method-Ready Pool of stateless beans. Figure 6-2 shows the state diagram for stateful session beans.

' VB Public Sub ApplyClientBehavior(endpoint As ServiceEndpoint, _ clientRuntime As ClientRuntime) _ Implements IEndpointBehavior.ApplyClientBehavior Dim inspector As New MessageTracer() clientRuntime.MessageInspectors.Add(inspector) End Sub // C# public void ApplyClientBehavior(ServiceEndpoint endpoint, ClientRuntime clientRuntime) { MessageTracer inspector = new MessageTracer(); clientRuntime.MessageInspectors.Add(inspector); }

PopulateDataSet(companyList);

A stateful bean instance in the Does Not Exist state has not been instantiated yet. It doesn t exist in the system s memory.

The third element in adding the inspector is to create an extension to house the behavior. This requires you to create another class.

DataRelation dr = companyList.Relations["Company_Employee"];

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