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website development website development 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. class Logger private_class_method :new @@logger = nil def Logger.

website development 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.[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.

website development 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.id » 537766930 Logger.

website development create.id » 537766930 Using class methods as pseudo-constructors can also make life easier for users of your class. As a trivial example, let's look at a class Shape that represents a regular polygon. Instances of Shape are created by giving the constructor the required number of sides and the total perimeter. class Shape def initialize(numSides, perimeter) # .

website development

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website development