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Imagine that you just got a new phone and started entering contacts. You entered three names and phone numbers. The final result would look something like figure 15.1. From a user s perspective, you have all that you need. But how is this data being stored In older phones, the underlying contact model might result in something similar to figure 15.2. This fixed-length record would dedicate a predetermined number of bytes to each contact. Such an approach had hard limits: for example, you might only be allowed 10 digits per phone number, 12 characters per name, and 500 records per device. This led to both undesirable truncation and wasted space. In addition to the problem of truncation, you can see that this style of contact storage doesn t allow the user to add new types of data. Figure 15.2 shows that there s no space between Chris and Frank to insert a
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There s nothing new here. The logic is identical to the logic defined earlier; we ve just encapsulated that knowledge about how to detect XSLT support. I m sure someone will thank us for this. So now we can get on to the business of fleshing out the rest of the XSLTHelper API. Let s keep things simple. How about saying that we ll have a single method for clients of our class to call to perform XSLT processing Our helper will have ancillary methods to separate the responsibilities of all the internal logic, but we ll provide a single API for our clients to use. The semantics will be as follows:
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The UNC pathname to the receipt printer used by this workstation to print out patron checkout receipts and payment receipts.
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Imagine that we want to display a list of all Person objects in the database. To do so, we look up the home interface for the entity bean and invoke a finder method on it. Then, given the resultant list of Person objects, we iterate through each one, spitting out information to an output stream. Arguably this design (figure 7.1) may not be the best for our client code, because we should be separating the presentation from the business logic. We ll leave that antipattern to be addressed elsewhere. For now, let s focus on the communication cost. Accessing the persistent data in an entity bean directly from a client will lead to network thrashing. The design simply requires too many network round-trips to do all but the most basic operations. Bitter Java introduced this antipattern in 2002, but many other books discussed the problem in various forms. We cannot say this strongly enough: In many cases, the number of network round-trips determines application performance success or failure. Solve any network communication problems, and you will be well on your way to good performance. Listing 7.1 shows an entity bean design that suffers from excessive round-tripping.
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Listing 5.10 ChartCanvas
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Notice a pattern Any external dependency on some sort of infrastructure is a great candidate to extract out into an interface that can be utilized by your controller. This separation has a couple of benefits:
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C.1.4 Transaction management
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APPENDIX D
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When starting a new emulator session, you are asked to pick the ROM image, device, skin, and RAM size for the device you are emulating as displayed in figure 8.13. Pick your recently downloaded ROM image and set the settings appropriate for your target device, and the emulator should display.
Figure 4.5 Our revised musical keyboard program allows the designer to specify multiple keyboards. Using CSS-based styling and the native render engine, we can accommodate both vertical and horizontal layouts without writing explicit layout code in our JavaScript.
Checks user is authenticated
Listing 4.14 Raising the AsyncPostBackError event before the dialog is displayed to the user
Just like classes, collections have their own proxies, which we usually call collection wrappers. Unlike classes, the collection wrapper is always there, even if lazy fetching is disabled (Hibernate needs the wrapper to detect collection modifications). Collection mappings may declare a lazy attribute, an outer-join attribute, neither, or both (specifying both isn t meaningful). The meaningful options are as follows:
AND [MakeFlag] = @original_MakeFlag AND [SafetyStockLevel] = @original_SafetyStockLevel AND [ReorderPoint] = @original_ReorderPoint" InsertCommand="INSERT INTO [Production].[Product] ([Name], [ProductNumber], [MakeFlag], [SafetyStockLevel], [ReorderPoint]) VALUES (@Name, @ProductNumber, @MakeFlag, @SafetyStockLevel, @ReorderPoint)" UpdateCommand="UPDATE [Production].[Product] SET [Name] = @Name, [ProductNumber] = @ProductNumber, [MakeFlag] = @MakeFlag, [SafetyStockLevel] = @SafetyStockLevel, [ReorderPoint] = @ReorderPoint WHERE [ProductID] = @original_ProductID AND [Name] = @original_Name AND [ProductNumber] = @original_ProductNumber AND [MakeFlag] = @original_MakeFlag AND [SafetyStockLevel] = @original_SafetyStockLevel AND [ReorderPoint] = @original_ReorderPoint" ConflictDetection="CompareAllValues" OldValuesParameterFormatString="original_{0}" > <DeleteParameters> <asp:Parameter Name="original_ProductID" Type="Int32" /> <asp:Parameter Name="original_Name" Type="String" /> <asp:Parameter Name="original_ProductNumber" Type="String" /> <asp:Parameter Name="original_MakeFlag" Type="Boolean" /> <asp:Parameter Name="original_SafetyStockLevel" Type="Int16" /> <asp:Parameter Name="original_ReorderPoint" Type="Int16" /> </DeleteParameters> <UpdateParameters> <asp:Parameter Name="Name" Type="String" /> <asp:Parameter Name="ProductNumber" Type="String" /> <asp:Parameter Name="MakeFlag" Type="Boolean" /> <asp:Parameter Name="SafetyStockLevel" Type="Int16" /> <asp:Parameter Name="ReorderPoint" Type="Int16" /> <asp:Parameter Name="original_ProductID" Type="Int32" /> <asp:Parameter Name="original_Name" Type="String" /> <asp:Parameter Name="original_ProductNumber" Type="String" /> <asp:Parameter Name="original_MakeFlag" Type="Boolean" /> <asp:Parameter Name="original_SafetyStockLevel" Type="Int16" /> <asp:Parameter Name="original_ReorderPoint" Type="Int16" /> </UpdateParameters> <InsertParameters> <asp:Parameter Name="Name" Type="String" /> <asp:Parameter Name="ProductNumber" Type="String" /> <asp:Parameter Name="MakeFlag" Type="Boolean" /> <asp:Parameter Name="SafetyStockLevel" Type="Int16" /> <asp:Parameter Name="ReorderPoint" Type="Int16" /> </InsertParameters> </asp:SqlDataSource> <asp:GridView ID="GridView1" runat="server" AllowPaging="True" AllowSorting="True" AutoGenerateColumns="False"
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C# provides a mechanism for declaring that a field holds a constant value, and will never, ever change. You use the const modifier, as Example 3-14 shows.
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