.net qr code generator A UTHENT I CATI ON AN D A UTHORIZA TI ON in VB.NET

Making QR Code ISO/IEC18004 in VB.NET A UTHENT I CATI ON AN D A UTHORIZA TI ON

CHAPTER 12 A UTHENT I CATI ON AN D A UTHORIZA TI ON
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Table 12-6. Results of Allowing or Denying Roles
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Deny
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None None Any Any
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All users have access. Only allowed roles have access. All roles except denied roles have access. Only allowed roles have access.
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Ultimately, the IsReadAllowed() and IsReadDenied() methods use the same IsInRole() provider scheme I discussed earlier in the chapter. This means that by default the current principal object s IsInRole() method is called but an advanced business developer could replace that behavior. The CanWriteProperty() and CanExecuteMethod() methods follow the same approach and the same default behavior as described in Table 12-6. Together, these methods allow per-property and per-method authorization on all business objects.
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This chapter covered the authorization subsystem provided by CSLA .NET. The authorization behaviors leverage the standard .NET principal and identity object model, which enables a role-based authorization scheme. Using this scheme, a business developer can specify which roles are allowed to create, get, edit, and delete each type of business object. They can also control which roles are allowed or denied read and write access to each property on a business object. The same is true for methods implemented by a business object. In s 13 through 16 I discuss the rest of the major framework features. Then, starting with 17, I walk through the ProjectTracker reference application implementation.
N-Level Undo
here are scenarios where an application requires the ability to undo changes made to an object. Data binding is one example because implementing the IEditableObject interface requires that an object be able to take a snapshot of its state, be edited, and then be able to return its state to that snapshot later. Another example is where the UI has a Cancel button that doesn t close the form or page, in which case the user expects that clicking Cancel will revert the form s data (and thus the business object) to a previous state. Implementing an undo feature is challenging, especially when you consider parent-child object relationships. When undoing changes to an Invoice object, for example, it is necessary to remove all newly added line items, re-add all removed line items, and undo all edited line items all that in addition to undoing changes to the Invoice object itself. It is important to remember that all child objects are part of the object s state. Of course, it is also important to follow good object-oriented programming (OOP) practices, and a key tenet of OOP is to preserve encapsulation. This means one object can t directly manipulate the state (fields) of another object. So, the Invoice object can t directly manipulate the state of its LineItemList collection or the LineItem objects it contains. Instead, it must ask each of those objects to manage its own state individually. The undo functionality provided by CSLA .NET is n-level undo. This means that you can cause the object to take multiple snapshots of its state and then cancel or accept each level of changes: _customer.BeginEdit() ' take a snapshot _customer.Name = "ABC Corp" _customer.BeginEdit() ' take a snapshot _customer.Name = "RDL Corp" _customer.BeginEdit() ' take a snapshot _customer.Name = "XYZ Corp" _customer.CancelEdit() ' undo to previous snapshot _customer.CancelEdit() ' undo to second snapshot _customer.ApplyEdit() ' keep first set of property changes The end result is that the Name property has the value of ABC Corp because the second two sets of property changes were discarded by calls to CancelEdit(). Not all applications use n levels of undo. In fact, most web applications don t use undo at all, and the implementation in CSLA .NET is designed so no overhead is incurred if the feature isn t used. Most WPF and Windows Forms applications use at least one level of undo because data binding uses the IEditableObject interface, which does take a snapshot of the object s state. If your WPF or Windows Forms interface also includes a Cancel button that doesn t close the form, you ll almost certainly use two levels of undo: one for IEditableObject and another for the form-level Cancel button. Some WPF and Windows Forms UI designs may use modal windows to allow editing of child objects. If you don t use in-place editing in a grid control, it is quite common to pop up a modal
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