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private jsp web hosting 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. Instead, we provide a class method,Logger.create.
private jsp web hosting 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.] We can check this by looking at the object identifiers the method returns. Logger.
private jsp web hosting create.id » 537766930 Logger.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.
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