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CHAPTER 5 CSLA . NET OBJECT TEMPLATES
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#region Server-side Code protected override void DataPortal_Execute() { // TODO: implement code to run on server // and set result value(s) _result = true; } #endregion } This class structure is quite a bit different from anything you ve seen so far. The Factory Methods region is similar to many of the other templates thus far in structure, but its implementation is different. Rather than passing a criteria object to the server, the Execute() method creates and initializes an instance of the command object itself. That instance is then sent to the server through the data portal, which invokes the DataPortal_Execute() method on the server. The Execute() method also calls BeforeServer() and AfterServer() methods, which are found in the Client-side Code region. The idea behind this is that the command object can be initialized on the client with any data required to perform the server-side processing. In fact, the object could do some processing or data gathering on the client before or after it is transferred to the server through the data portal. The client-side code may be as complex as needed to prepare to run the server-side code. Then the data portal moves the object to the application server and calls the DataPortal_Execute() method in the Server-side Code region. The code in this method runs on the server and can do any server-side work. This might be something as simple as doing a quick database lookup, or it might be a complex server-side workflow. The code in this method can create and interact with other business objects (all on the server, of course). It can interact directly with the database or any other serverside resources, such as the server s file system or third-party software installed on the server. As with the editable root stereotype, you can use the ObjectFactory attribute to have the data portal invoke an Update() method from an object factory rather than invoke the DataPortal_Execute() method in the command object directly. Command objects are powerful because they provide high levels of flexibility for running both client and server code in a coordinated manner.
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Name/Value List Objects
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Perhaps the simplest business object to create is a name/value list that inherits from the NameValueListBase class in the CSLA .NET framework. The base class provides almost all the functionality needed, except the actual data access and factory method. Because name/value list data is often static and changes rarely, it is often desirable to cache the data. You can do this in the factory method, as shown in this template: [Serializable] public class NameValueList : NameValueListBase<int, string> { #region Factory Methods private static NameValueList _list; public static NameValueList GetNameValueList() { if (_list == null) _list = DataPortal.Fetch<NameValueList>();
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CH A PT ER 5 C SLA .NET O BJECT T EMPLAT ES
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return _list; } public static void InvalidateCache() { _list = null; } private NameValueList() { /* require use of factory methods */ } #endregion #region Data Access private void DataPortal_Fetch() { RaiseListChangedEvents = false; IsReadOnly = false; // TODO: load values //object listData = null; //foreach (var item in listData) // Add(new NameValueListBase<int, string>. // NameValuePair(item.Key, item.Value)); IsReadOnly = true; RaiseListChangedEvents = true; } #endregion } The Factory Methods region declares a static field to hold the list once it is retrieved. Notice how the factory method returns the cached list if it is present; it only calls the data portal to retrieve the data if the list is null. You can also call an InvalidateCache() method to force a reload of the data if needed. This caching behavior is optional if it doesn t fit your need, then use a factory method, like this: public static NameValueList GetNameValueList() { return DataPortal.Fetch<NameValueList>(); } The Data Access region contains only a DataPortal_Fetch() method, which calls the Data Access layer to retrieve the name/value data. The NameValueListBase class defines a strongly typed NameValuePair class, which is used to store each element of data. For each row of data from the database, a NameValuePair object is created and added to the collection. Notice the use of the IsReadOnly property to temporarily unlock the collection and then relock it so it becomes read-only once the data has been loaded. The RoleList class in the Project Tracker reference application illustrates a complete implementation of a name/value list.
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