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inexpensive web hosting and free domain registration 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. 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.
inexpensive web hosting and free domain registration 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.[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.
inexpensive web hosting and free domain registration ] We can check this by looking at the object identifiers the method returns. Logger.create.id » 537766930 Logger.create.
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