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When you build a host for a WCF service type, you follow a predictable set of steps some that rely on configuration and some that rely on code: 1. 2. 3. Define the endpoint for the WCF service being hosted within the host s configuration file. Programmatically use the ServiceHost type to expose the service types available from this endpoint. Ensure the host remains running to service incoming client requests. Obviously, this step is not required if you host your service types using a Windows service or IIS.

In the world of WCF, the term endpoint represents the address, binding, and contract rolled together in a nice, tidy package. In XML, an endpoint is expressed using the <endpoint> element and the address, binding, and contract elements. Update your *.config file to specify a single endpoint (reachable through port 8080) exposed by this host: < xml version="1.0" encoding="utf-8" > <configuration> <system.serviceModel> <services> <service name="MagicEightBallServiceLib.MagicEightBallService"> <endpoint address ="http://localhost:8080/MagicEightBallService" binding="basicHttpBinding" contract="MagicEightBallServiceLib.IEightBall"/> </service> </services> </system.serviceModel> </configuration> Notice that the <system.serviceModel> element is the root for all of a host s WCF settings. Each service exposed by the host is represented by a <service> element that is wrapped by the <services> base element. Here, your single <service> element uses the (optional) name attribute to specify the friendly name of the service type. The nested <endpoint> element handles the task of defining the address, the binding model (basicHttpBinding, in this example), and the fully qualified name of the interface type defining the WCF service contract (IEightBall). Because you are using an HTTP-based binding, you use the http:// scheme, specifying an arbitrary port ID.

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In fact, in this case the reputation is a little worse than the reality. Interpreted code is certainly slower than compiled code, but the performance hit isn t so significant that you can t build a professional website using ASP.

HQL is a very powerful query language with a syntax very similar to standard SQL. The difference is that with HQL you are querying persisted objects rather than database entities. For example, if you have a database table called users that is mapped to the User persisted object, to get all users using HQL you query the persisted object. Hibernate also allows you to directly use native SQL, but I strongly suggest using HQL whenever possible. If you use a standard SQL statement directly, it will restrict your choices and make it harder in the future to change to a different database, say from MySql to Oracle. In a case like that, you would need to review all of your SQL statements as they will not be completely compatible with the new database. The following two statements show how SQL and HQL are similar: SQL = SELEC * FROM users HQL = from User ; HQL provides functionalities to map even the most complex SQL queries. Because the HQL dialect is similar to SQL, I feel the best and most practical way to understand it is to explain how and where to use HQL dialect, and I ll also provide a table with the most used SQL queries mapped to HQL. So let's come back to our UserManager example application to add the package com.apress.flexjava.usermanager.dao.hibernate, as shown in Figure 5-20.

With the current configuration file in place, the actual programming logic required to complete the host is simple. When your executable starts up, you will create an instance of the ServiceHost class and inform it which WCF service it is responsible for hosting. At runtime, this object will automatically read the data within the scope of the <system.serviceModel> element of the host s *.config file to determine the correct address, binding, and contract. It will then create the necessary plumbing: static void Main(string[] args) { Console.WriteLine("***** Console Based WCF Host *****"); using (ServiceHost serviceHost = new ServiceHost(typeof(MagicEightBallService))) { // Open the host and start listening for incoming messages. serviceHost.Open(); // Keep the service running until the Enter key is pressed. Console.WriteLine("The service is ready."); Console.WriteLine("Press the Enter key to terminate service."); Console.ReadLine(); } } If you run this application now, you will find that the host is alive in memory, ready to take incoming requests from remote clients.

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