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Unfortunately, because the garbage collector uses a single thread to execute all finalizers, use of finalizers can have a detrimental effect on the efficiency of the garbage collection process, which will affect the performance of your application In addition, you cannot control when the runtime frees unmanaged resources because you cannot call an object s finalizer directly, and you have only limited control over the activities of the garbage collector using the SystemGC class As a complementary mechanism to using finalizers, the NET Framework defines the Dispose pattern as a means to provide deterministic control over when to free unmanaged resources To implement the Dispose pattern, a class must implement the IDisposable interface, which declares a single method named Dispose.

Assertions are primarily useful to avoid the scenario where code is executed under an invalid state and, to this end, are a useful debugging tool. In terms of this book, assertions are also useful for revealing what the current state of an executing Groovy program is. Listing A-2 shows an example of an assertion in action. Listing A-2. Groovy Assertions def num = 1 assert num == 1 Here we simply verify that the variable called num still has a value of 1 at the point of execution in the code. Assertions will be utilized throughout many of the following examples, including in our coverage of Groovy strings, which we ll cover next.

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In the Dispose method, you must implement the code necessary to release any unmanaged resources and remove the object from the list of objects eligible for finalization if a finalizer has been defined Instances of classes that implement the Dispose pattern are called disposable objects When code has finished with a disposable object, it calls the object s Dispose method to free all resources and make it unusable, but still relies on the garbage collector to eventually release the object memory It s important to understand that the runtime does not enforce disposal of objects; it s the responsibility of the client to call the Dispose method However, because the NET Framework class library uses the Dispose pattern extensively, C# provides the using statement to simplify the correct use of disposable objects The following code shows the structure of a using statement: using (FileStream fileStream = new FileStream("SomeFiletxt", FileMode.

Groovy supports a concept found in many other languages such as Perl and Ruby called string interpolation. Because this is rather a mouthful in Groovy-land, they re simply (or comically, depending on which way you look at it) known as GStrings. A GString is just like a normal string, but it allows the embedding of variables within it, using the familiar ${..} syntax found in many popular Java frameworks including Spring, Ant, and an array of view technologies. The curly braces can be omitted if it is simply the variable name that is required. Listing A-3 also demonstrates another powerful feature of Groovy s string support: multiline strings. These are defined with the triple-quotation syntax. Listing A-3. GStrings in Action def person = "John" println """ ${new Date()} Dear $person, This is a Groovy letter! Yours Sincerely, The XYZ Company """

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Open)) { // Do something with the fileStream object } When the code reaches the end of the block in which the disposable object was declared, the object s Dispose method is automatically called, even if an exception is raised Here are some points to consider when implementing the Dispose pattern:.

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