winforms qr code reader

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Figure 19 3 : Managed heap after a collection As you can see, a garbage collection generates a considerable performance hit, which is the major downside of using a managed heap. But keep in mind that garbage collections occur only when generation 0 is full, and until then, the managed heap is significantly faster than a C runtime heap. Finally, the CLR s garbage collector offers some optimizations that greatly improve the performance of garbage collection. I ll discuss these optimizations later in this chapter, in the Generations and Other Garbage Collector Performance Issues sections. As a programmer, you should take away a couple important points from this discussion. To start, you no longer have to implement any code that manages the lifetime of objects your application uses. And notice how the two bugs described at the beginning of this chapter no longer exist. First, it s not possible to leak objects because any object not accessible from your application s roots can be collected at some point. Second, it s not possible to access an object that is freed because the object won t be freed if it is reachable, and if it s not reachable, your application has no way to access it. The following code demonstrates how objects are allocated and managed:

Save the Professional.master page. Then click File, and click Save Professional.master As. Save a second copy of the master page and name it Colorful.master. Change the style sheet reference from

import java.awt.*; import java.util.*; import javax.swing.*; import pattern.worker.*; public abstract aspect SwingThreadSafetyAspect { abstract pointcut uiMethodCalls(); abstract pointcut uiSyncMethodCalls();

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// Initialize the helper class's fields class1.numToDo = numToDo; class1.squares = new Int32[class1.numToDo]; class1.done = new AutoResetEvent(false); // Do a bunch of tasks on other threads for (Int32 n = 0; n < class1.squares.Length; n++) { if (callback1 == null) { // New up delegate object bound to the helper object and // its anonymous instance method callback1 = new WaitCallback( class1.<UsingLocalVariablesInTheCallbackCode>b__0); } ThreadPool.QueueUserWorkItem(callback1, n); } // Wait for all the other threads to finish class1.done.WaitOne(); // Show the results for (Int32 n = 0; n < class1.squares.Length; n++) Console.WriteLine("Index {0}, Square={1}", n, class1.squares[n]); } // The helper class is given a strange name to avoid potential // conflicts and is private to forbid access from outside AClass [CompilerGenerated] private sealed class <>c__DisplayClass2 : Object { // One public public public public field per local variable used in the callback code Int32[] squares; Int32 numToDo; AutoResetEvent done;

You can access the CCNet configuration file via the Start menu or edit it directly using, for example, Notepad, in %Program Files%\CruiseControl.NET\server\ccnet.config if you installed CCNet in the default location. Immediately after installation, you have an empty configuration file like this:

The @TransactionAttribute can be applied per method, or you can use it on the bean class to define the default transaction attribute for the entire bean class. In the case of our test TxWrappingEJB, the bean implementation class achieves the proper transaction isolation by always starting a new transaction and by running the business method inside of its context. This is implemented by using TransactionAttribute Type.REQUIRES_NEW:

As a general rule, small and simple favors structs. The larger and more complex a data structure is, the more likely it should be implemented as a class. When working in a resource-constrained environment where memory needs to be freed quickly, structs will provide a benefit over the nondeterministic garbage collection of classes. Because structs are allocated on the stack, their memory is freed as soon as they go out of scope. If speed is of paramount importance, efficiency will be gained from the stack-based nature of structs. Frequently passing a struct as a parameter or assigning structs to variables can be expensive; bear in mind that a complete copy of the contents of that struct is created each time and is more costly than copying an object reference. Frequent method calls are better served by classes; the overhead of implicit boxing can forfeit benefits gained from the fact that structs are stack-based. When a data structure will be used inside a containing structure, the approach used by the container to manage its contents can dramatically affect overall performance. In a collection, a struct will be repeatedly boxed as the Equals or GetHashCode method is called. This will cause a significant performance overhead. In an array, a struct can provide higher efficiency than a class, as there is no need to look up references.

For example, some method in your base class calls its MethodA, then its MethodB, to do some work. You then (perhaps unknowingly) rely on that ordering when you provide overrides for MethodA and MethodB. If a future version of the base class changes that ordering, you will break. Let s go back to our example to look at that in more detail, because it is really important. First, let s change the implementation of Firefighter.ExtinguishFire so that it makes use of a couple of helper methods: TurnOnHose and TrainHoseOnFire (see Example 4-8).

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