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cheap private java apache cheap private java apache 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. 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.

cheap private java apache 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 . 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.

cheap private java apache 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.create. This uses the class variable @@logger to keep a reference to a single instance of the logger, returning that instance every time it is called.

cheap private java apache [The implementation of singletons that we present here is not thread-safe; if multiple threads were running, it would be possible to create multiple logger objects. Rather than add thread safety ourselves, however, we'd probably use the Singleton mixin supplied with Ruby, which is documented on page 468.] We can check this by looking at the object identifiers the method returns. Logger.create.

cheap private java apache

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