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Csla.Server.CallMethodException
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The MethodCaller class throws a custom Csla.Server.CallMethodException in the case that an exception occurs while calling a method on the business object. The purpose behind throwing this exception is to supply the name of the business method that generated the exception, and to provide the original exception details as an InnerException. More importantly, it preserves the stack trace from the original exception. The original stack trace shows the details about where the exception occurred, and is very useful for debugging. Without a bit of extra work, this information is lost as the method call comes back through reflection. Remember that MethodCaller.CallMethod() uses reflection to invoke the business method. When an exception occurs in the business method, a reflection exception is thrown with the original business exception nested inside. CallMethod() strips off the reflection exception and provides the original business exception as a parameter during the creation of the CallMethodException object. In the constructor of CallMethodException, the stack trace details from that original exception are stored for later use: public CallMethodException(string message, Exception ex) : base(message, ex) { _innerStackTrace = ex.StackTrace; } Then in the StackTrace property of CallMethodException, the stack trace for the CallMethod Exception itself is combined with the stack trace from the original exception:
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CHAPTER 4 s DATA ACCESS AND SECURITY
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public override string StackTrace { get { return string.Format("{0}{1}{2}", _innerStackTrace, Environment.NewLine, base.StackTrace); } } The result is that the complete stack trace is available showing the flow from the original exception all the way back to the UI in most cases.
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Csla.RunLocalAttribute Class
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The data portal routes client calls to the server based on the client application s configuration settings in its config file. If the configuration is set to use an actual application server, the client call is sent across the network using the channel adapter pattern. However, there are cases in which the business developer knows that there s no need to send the call across the network even if the application is configured that way. The most common example of this is in the creation of new business objects. The DataPortal. Create() method is called to create a new object, and it in turn triggers a call to the business object s DataPortal_Create() method, where the object can load itself with default values from the database. But what if an object doesn t need to load defaults from the database In that case, there s no reason to go across the network at all, and it would be nice to short-circuit the call so that particular object s DataPortal_Create() would run on the client. This is the purpose behind the RunLocalAttribute. A business developer can mark a data access method with this attribute to tell Csla.DataPortal to force the call to run on the client, regardless of how the application is configured in general. Such a business method would look like this: [RunLocal()] private void DataPortal_Create(Criteria criteria) { // set default values here } The attribute class itself is quite straightforward: [AttributeUsage(AttributeTargets.Method)] public sealed class RunLocalAttribute : Attribute { } As with all custom attributes, it inherits from System.Attribute. The [AttributeUsage()] attribute is used to restrict this attribute so it can only be applied to methods not classes, properties, etc.
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The Csla.DataPortal class will raise a couple events that can be handled by the business logic or UI code on the client. These events are raised immediately before and after the data portal calls the server. A DataPortalEventArgs object is provided as a parameter to these events. This object includes information of value when handling the event:
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CHAPTER 4 s DATA ACCESS AND SECURITY
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public class DataPortalEventArgs : EventArgs { private Server.DataPortalContext _dataPortalContext; public Server.DataPortalContext DataPortalContext { get { return _dataPortalContext; } } public DataPortalEventArgs(Server.DataPortalContext dataPortalContext) { _dataPortalContext = dataPortalContext; } } The DataPortalContext property returns the Csla.Server.DataPortalContext object that is passed to the server as part of the client message. The DataPortalContext class will be implemented later in the chapter, but it includes the user s Principal object (if using custom authentication), the client s culture information, and the ClientContext and GlobalContext collections. This information can be used by code handling the event to better understand all the information being passed to the server as part of the client message.
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