low cost private jsp private java

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low cost private jsp private java low cost private jsp private java We'll set this limit using a class constant, which is simply a constant (remember constants? they start with an uppercase letter) that is initialized in the class body. class SongList MaxTime = 5*60 # 5 minutes def SongList.isTooLong(aSong) return aSong.duration > MaxTime end end song1 = Song.new("Bicylops", "Fleck", 260) SongList.

low cost private jsp private java isTooLong(song1) » false song2 = Song.new("The Calling", "Santana", 468) SongList.isTooLong(song2) » true Singletons and Other Constructors Sometimes you want to override the default way in which Ruby creates objects. As an example, let's look at our jukebox. Because we'll have many jukeboxes, spread all over the country, we want to make maintenance as easy as possible.

low cost private jsp private java Part of the requirement is to log everything that happens to a jukebox: the songs that are played, the money received, the strange fluids poured into it, and so on. Because we want to reserve the network bandwidth for music, we'll store these logfiles locally. This means we'll need a class that handles logging. However, we want only one logging object per jukebox, and we want that object to be shared among all the other objects that use it. Enter the Singleton pattern, documented in Design Patterns .

low cost private jsp private java We'll arrange things so that the only way to create a logging object is to call Logger.create, and we'll ensure that only one logging object is ever created. class Logger private_class_method :new @@logger = nil def Logger.create @@logger = new unless @@logger @@logger end end By making Logger's method new private, we prevent anyone from creating a logging object using the conventional constructor. Instead, we provide a class method,Logger.

low cost private jsp private java

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low cost private jsp private java