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affordable web hosting space provider class SongList MaxTime = 5*60 # 5 minutes def SongList.isTooLong(aSong) return aSong.duration > MaxTime end end song1 = Song.new("Bicylops", "Fleck", 260) SongList.isTooLong(song1) » false song2 = Song.
affordable web hosting space provider 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. 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.
affordable web hosting space provider 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 . We'll arrange things so that the only way to create a logging object is to call Logger.
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