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In the early days of programming, there was a technique called single entry, single exit. The idea is that when the method is called, the method can only return in a single location. Consider the following sources, which illustrate a normal method and another method that s written using a single entry, single exit strategy: class ExampleSingleEntrySingleExit { private int _defaultValue = 12; public int MethodNormal( int param1) { if( param1 < 10) { return param1 / 2; } else if( param1 > 100) { throw new Exception(); } return _defaultValue; } public int MethodSeSx( int param1) { int retval = _defaultValue; if( param1 < 10) { retval = param1 / 2; goto exit_method; } else if( param1 > 100) { throw new Exception(); } exit_method: return retval; } }
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So, we ve nearly completed our activity. The hard-core code is done; we have just a few more things to take care of. First we need to set up the PayloadItem property that we referenced in our code earlier. We ll take care of that next.
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Figure 38-2. Selecting a debugger
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Often not thought of as an architecture requirement, as it pertains more to the user interface design than to the nonfunctional requirements. However, requirements of usability can definitely affect your system architecture. For example, if the user makes a long running request for data, and there s a usability requirement that any operation taking more than two seconds should be cancelable by the user, you must account for this (asynchrony) in your architecture. This metric has really come into its own over the last couple of years. More and more IT departments are drawing a line in the sand, saying if we can t maintain it, you can t put it into production. Some of the pain of DLL Hell and Distributed Component Object Model (DCOM) account for this metric s meteoric rise. Chances are you ll need to consider this metric for any substantial enterprise development. Products such as Microsoft s MOM and Team System offerings attempt to address this specifically. This metric is usually considered a subset of availability. It describes the system s capability to recover from fault or failure, which could threaten the system s availability. Tactics include automatic failover (clustering and load balancing), having a spare on hand, and systems that implement the ACID rules of transactions. In addition to deployment issues, this attribute can also pertain to tracing and auditing. When something goes wrong for a user, can the app re-create the data If there s an attack, can the app recover and restore the data This is the attribute that captures whether or not you can repeat processes from one environment to another. Database scripts are a good example of this metric. If the database has been created using a high-level GUI tool, you have no guarantee that the database will look the same in development, testing, staging, and production. Component installation is another process that should be designed for repeatability as well.
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Using the BasicEffect, it is easy to use per-pixel lighting. When setting your BasicEffect parameters, simply add this line: basicEffect.PreferPerPixelLighting = true;
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These four base classes are the primary classes from which most business objects will inherit. 5 will cover the other base classes: CommandBase and NameValueListBase. BusinessBase and BusinessListBase rely on quite a number of other classes. For instance, Csla. BusinessBase inherits from Csla.Core.BusinessBase, which inherits from Csla.Core.UndoableBase. It also makes use of the ValidationRules and AuthorizationRules classes. The end result is that this chapter will cover the creation of the four base classes, plus the types and classes in the Csla.Core namespace and most of the types from the Csla.Validation and Csla. Security namespaces. Table 3-1 lists all the classes discussed in this chapter. Table 3-1. Classes Required to Support Editable and Read-Only Business Objects
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as shown in the following code: namespace CustomZStackPanelProject { public partial class Page : UserControl { public Page() { InitializeComponent(); ImageSelector.MouseLeftButtonDown += new MouseButtonEventHandler (ImageSelector_MouseLeftButtonDown); } void ImageSelector_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
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As with a regular business object, a collection needs to support n-level undo. The functionality in BusinessListBase must integrate with UndoableBase. This means that BusinessListBase must implement the Csla.Core.IEditableCollection interface, which inherits from Csla.Core. IUndoableObject. Implementing the interface requires that the class implement CopyState(), UndoChanges(), and AcceptChanges() methods that store and restore the collection s state as appropriate. Because a collection can also be a root object, it needs Public methods named BeginEdit(), CancelEdit(), and ApplyEdit(), like BusinessBase. In either scenario, the process of taking a snapshot of the collection s state is really a matter of having all the child objects take a snapshot of their individual states. The undo operation for a collection is where things start to get more complicated. Undoing all the child objects isn t too hard, since the collection can cascade the request to each child object. At the collection level, however, an undo means restoring any objects that were deleted and removing any objects that were added, so the collection s list of objects ends up the same as it was in the first place. There s a fair amount of code in BusinessListBase just to deal with deletion of child objects in order to support n-level undo. As with the rest of the framework, if n-level undo isn t used, then no overhead is incurred by these features.
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Useful in a scenario where your workflow accepts external input and expects that input to be within a certain range. If the received input is outside that range, you can throw an exception and let the Fault Handler catch and handle the error.
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Iteration 4: Increasingly Clever Optimizations
The first thing the method does is check to see whether rule checking is suppressed: If _suppressRuleChecking Then Return New String() {} End If A business object can set ValidationRules.SuppressRuleChecking to True to prevent CheckRules() from doing any work. This is often useful when a lot of interdependent properties must be loaded all at once (such as behind a web page or XML service). In that case, an explicit call to CheckRules() is typically made after all property values have been loaded so the rules can be executed in a more efficient manner. The methods return a String array. That array contains a list of the property names for which rules were checked. If a rule has dependent properties, then this call may check the rules for more than one property. The code in BusinessBase uses this String array to determine what PropertyChanged events should be raised, as I discussed in 10. Of course, it is clear that at least the requested property s rules will be checked: Dim result = New List(Of String)() result.Add(propertyName) This method gets the list of rules for this property by calling the RulesToCheck property: Dim rules = RulesToCheck If rules IsNot Nothing Then The RulesToCheck property is interesting, because it provides a consolidated list of the rules for this property. The list is a combination of the per-instance and per-type rules. Usually only per-type rules exist, but if there are per-instance rules, they are merged into the list as well, and the list is sorted by priority. Look at the property in the ValidationRules class to see how this is done. Obviously, CheckRules() continues to do work only if the rules field is not Nothing; if it is Nothing, then no rules are associated with this property, and the method can just exit. Assuming there are rules for this property, the list of rules is retrieved from the ValidationRulesManager, and the GetList() method is used to get the sorted list of IRuleMethod objects: Dim rulesList = rules.GetRulesForProperty(propertyName, False) If rulesList IsNot Nothing Then ' get the actual list of rules (sorted by priority) Dim list = rulesList.GetList(True) If list IsNot Nothing Then CheckRules(list) End If The sorted list is passed to another overload of CheckRules(). That overload is responsible for looping through the list and invoking each rule. It is also responsible for adding and removing items from the list of broken rules, which I ll discuss later in this chapter. Finally, if there are any dependent properties associated with the current property, their rules are checked too:
class DeprecatedUsage { @SuppressWarnings("deprecation") public void useDeprecatedMethod() { Dep.myDeprecatedMethod(); } }
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