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Source-code processing is often clumsy in practice. A currently popular approach is to process the compiled bytecode. Bytecode processing is usually implemented as a post-compile step in the build process. It can also be done at class-loading time in environments where the persistence mechanism can gain control of the classloader. Bytecode processing is transparent at the code level and may be convenient if your IDE is closely integrated with the enhancer. We prefer that an ORM implementation do all its work at runtime rather than buildtime, since this is the simplest way to short-circuit any possible problems with toolset integration but we ll leave you to make up your own mind. Of the buildtime techniques available, bytecode processing is our preference.

Try It Out: Return Complex Data Types Now, you will add another web method, called GetContactRequests(), which will return complex data. 1. Open the Partners.asmx file in the Design view and drop a new SqlCommand component on the design surface. Name it cmContacts and set its CommandText to the following query, through the Query Builder (so that you can enter the comments and line breaks): SELECT /* Return fields we're interested in */ ContactUser.FirstName, ContactUser.LastName, ContactUser.Email, ContactUser.Notes, ContactUser.IsApproved FROM [User] INNER JOIN /* Join with the contact information to get the one for the user matching the login and pwd */ (SELECT [User].FirstName, [User].LastName, [User].Email, Contact.Notes, Contact.IsApproved, Contact.DestinationID FROM /* Another join to retrieve the requester name */ Contact INNER JOIN [User] ON [User].UserID = Contact.RequestID) AS ContactUser /* Filter contact information for the current destination user */ ON [User].UserID = ContactUser.DestinationID WHERE /* This is the filter that restricts the inner contact results */ [User].Login = @Login AND [User].Password = @Password 2. Import the following namespace at the top of the web service code-behind Partners class: Imports System.Data.SqlClient 3. Add the following new web method to the class: <WebMethod()> _ Public Function GetContactRequests(ByVal login As String, _ ByVal password As String) As DataSet cnFriends.Open() Try cmContacts.Parameters("@Login").Value = login cmContacts.Parameters("@Password").Value = password Dim contacts As New DataSet Dim ad As New SqlDataAdapter(cmContacts) ad.Fill(contacts) Return contacts Finally cnFriends.Close() End Try End Function

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Runtime reflection has an image problem in the Java community: Reflective systems are perceived to be slow. This is partly untrue reflection is much faster in modern JVMs than in JDK 1.2 and partly irrelevant to our class of problems. Even if reflection was really as slow as some people assume, the overhead is insignificant compared to the cost of disk access and interprocess (even network) communication that dominates data access. There really is no good reason to avoid the use of reflection in a persistence layer. On the other hand, there is one excellent reason to choose reflection over other techniques such as code generation: Reflection doesn t intrude on the build cycle

4. Finally, let s use our own namespace for the web service messages: <System.Web.Services.WebService( _ Namespace:="http://www.apress.com/services/friendsreunion")> _ Public Class Partners 5. Save and run the application. You ll see that there are now two methods listed on the page that is displayed, as shown in Figure 9-5, since you now have two web methods in the code-behind page.

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or on the performance of system initialization. This has a definite positive effect on developer performance. Early versions of Hibernate used reflection exclusively for interaction with the domain objects. This solution was popular with users and was shown to cause only a slight performance overhead. However, JDK reflection was found insufficient when it came to the problem of lazy fetching. To implement lazy fetching of associations, Hibernate uses proxies. A proxy is an object that implements the public interface of a business object and intercepts all messages sent to that object by its clients. In the case of Hibernate, interception is used to load the proxied object s state from the database the first time it s used. For proxying many-valued associations, Hibernate uses implementations of the collection interfaces defined in java.util. For single-point associations (an object reference to a user-defined class), more sophisticated machinery is required. Java provides java.lang.reflect.Proxy for JDK 1.3 and above. An instance of Proxy may be instantiated at runtime, implementing a given list of interfaces. This solution is great if your persistent objects are accessed by clients only via an interface, but what if the persistent class doesn t implement an interface at all You don t want to force the unwieldy EJB-style local interfaces on your POJOs. They re supposed to be plain, remember! So, if Java reflection can t solve all your problems, what option remains

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