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1 The activities in this section were to introduce you to design patterns You should consider looking back through the programs earlier in the book and identifying situations where patterns would be useful Look up some components you have used in NET programs in the help system (eg ArrayList), and read the section on Thread Safety Look up the Thread class and read the help pages on that Be aware that threads are there to improve the overall throughput of information in programs, but in most software will simply be an unnecessary and dangerous addition Look up a some Internet resources on concurrency and nd out what the good and bad features are
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a) b)
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The business tier Here we need to distinguish between colUsers a collection of bank account User objects or account holders and application users, who would communicate with the business objects using the presentation tier It would be feasible to create ApplicationUser objects which managed purely user-interface data and interactions and place these in the presentation tier, although even here, these objects would probably need to manage some aspects of the business rules of the application, such as security access rights, and so might be better placed in the business tier However, the bank account User objects stored in colUsers are certainly implementations of business rules for bank account management and so undoubtedly belong in the business tier A better approach to constructing and managing collections of business tier objects in an application would be to build a strongly typed collections, as described in the chapter on inheritance, using CollectionBase as a starting point
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For example, we can look at the CAD program done in the practical activity at the end of the previous chapter Objects are created in response to eventhandlers (button clicks) in the presentation tier Once an object is created, it is positioned and sized in response to user-interactions in the presentation tier, although the actual re-sizing and positioning is done in methods of the drawn
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objects ie in the business tier Objects are nally destroyed in response to the main form closing down a presentation tier event In this application, as in many highly interactive programs, the interactions between business objects and user-interface objects make the division of the application into speci c tiers complex However, the identi cation of tiers is straightforward enough drawn objects and the collections they are managed in form the business tier, and the user-interface and associated event-handlers are the presentation tier Because of the care taken to preserve the class interface of the earlier forms of bank account, using this more complex form of account will be no different and in fact illustrates one of the most signi cant bene ts of object-oriented programming
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Exercise 103
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Public Function GetStatement() As String Dim T As Transaction Dim stmt As StringBuilder = New StringBuilder() stmtAppend("Bank Account Statement" & _ EnvironmentNewLine) stmtAppend("Account Name: " & Customer1Name) If Not (Customer2 Is Nothing) Then stmtAppend(" and " & Customer2Name) End If stmtAppend(EnvironmentNewLine) stmtAppend("Account Number: " & mvarAccountNumber & _ EnvironmentNewLine) For Each T In mvarTransactions stmtAppend(TGetStatementLine & _ EnvironmentNewLine) Next Return stmtToString() End Function
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There is no set solution to this exercise You can nd the rst statement executed in an application by stepping into the application using Debug Step Into instead of the Run command in the IDE There is no set solution to this exercise It is worth performing the activity on a range of programs to discover how and when objects are disposed of Structures in software indicate how objects are connected together (eg to form lists, collections or compositions) Patterns in software are less speci c, in that they can indicate elements of structure, algorithms or simply well tried techniques and methods
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