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create web site online create web site online 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.

create web site online 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.

create web site online 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) # .

create web site online .. end end However, a couple of years later, this class is used in a different application, where the programmers are used to creating shapes by name, and by specifying the length of the side, not the perimeter. Simply add some class methods to Shape. class Shape def Shape.

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