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A primitive persistence layer with no identity scope makes no guarantees that if a row is accessed twice the same Java object instance will be returned to the application. This becomes problematic if the application modifies two different instances that both represent the same row in a single unit of work. (How should we decide which state should be propagated to the database ) A persistence layer using persistence context-scoped identity guarantees that, in the scope of a single persistence context, only one object instance represents a particular database row. This avoids the previous problem and also allows for some caching at the context level. Process-scoped identity goes one step further and guarantees that only one object instance represents the row in the whole process (JVM).

The Visual Basic results are as expected, but the Java and C# results are not as expected. Apparently that s because of the way switch-case statements are structured in C++ and Java since each value must be enumerated individually rather than in ranges, the C++ and Java code doesn t benefit from the optimization as the Visual Basic code does. This result underscores the importance of not following any optimization advice blindly specific compiler implementations will significantly affect the results. You might assume that the code generated by the Visual Basic compiler for a set of if-then-elses that perform the same test as the case statement would be similar. Here are those results:

As I've said several times in this book, code coverage is one of the goals you need to strive for when doing your unit testing If, for example, you have a conditional expression inside a function and it's difficult to see at a glance what it evaluates to so that you can step into the true or false branch as appropriate, the Watch window becomes your savior Since there's a full expression evaluator built in, you can simply drag the expression in question down to the Watch window and see what it evaluates to Granted, there are some restrictions If your expression calls all sorts of functions instead of using variables, you could be in trouble.

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If you look at my code, I follow the rule in which if I have three or more subexpressions in a conditional, I use only variables just so that I can see the result of the expression in the Watch window Some of you might be truth table savants and be able to see how those expressions evaluate off the top of your heads, but I certainly am not one To make this clearer, let's use the next expression as an example You can highlight everything inside the outer parentheses and drag it to the Watch window However, since it's on three lines, the Watch window interprets it as three separate lines in its display I still do that so that I can copy and paste the two lines into the first one and thus build my final expression without too much typing.

In previous examples, you ve programmatically added your BLOBs to the storage service. In this example, you ll make use of a tool called Chris Hay s Azure Blob Browser (can you guess from the title who created it ) to upload the files to BLOB storage. Figure 10.4 shows the addition of the calculator.js file to BLOB storage via the tool.

Referencing static images via a URL remains the fastest way to have an image downloaded to a client. No extra code is required, and the browser and the Web server handle it automatically without involving the ASP.NET runtime. The DynamicImage control provides a familiar programming interface in addition to alternative ways to get image bytes. You should use the DynamicImage control when the image you want to return cannot be addressed using a static and immutable URL. If the image resides in a database or is created on the fly, using DynamicImage results in much better performance primarily because the image-generation service running behind the control implements caching. Also, the DynamicImage control always uses an optimized HTTP handler to return images to the browser. Performance-wise, this is better than writing an ASPX page that returns a content type of JPEG or GIF. Let s look at how to use the DynamicImage control.