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In object-oriented programming, the singleton pattern is a software design pattern that restricts the instantiation of a class to a singular instance. It is one of the well-known "Gang of Four" design patterns , which describe how to solve recurring problems in object-oriented software. [ 1 ]
If the helper object is static (one per class loader), an alternative is the initialization-on-demand holder idiom [11] (See Listing 16.6 [12] from the previously cited text.) // Correct lazy initialization in Java class Foo { private static class HelperHolder { public static final Helper helper = new Helper (); } public static Helper getHelper ...
Some use cases for this pattern are static polymorphism and other metaprogramming techniques such as those described by Andrei Alexandrescu in Modern C++ Design. [7] It also figures prominently in the C++ implementation of the Data, Context, and Interaction paradigm. [8]
The helper classes generally have no objects hence they have all static methods that act upon different kinds of class objects. Yes Yes Yes Specification: Recombinable business logic in a Boolean fashion. Yes Yes Yes State: Allow an object to alter its behavior when its internal state changes. The object will appear to change its class. Yes Yes ...
In computer programming, lazy initialization is the tactic of delaying the creation of an object, the calculation of a value, or some other expensive process until the first time it is needed.
An object that applies this pattern can provide the equivalent of a namespace, providing the initialization and finalization process of a static class or a class with static members with cleaner, more concise syntax and semantics. It supports specific cases where a class or object can be considered structured, procedural data.
Design Patterns: Elements of Reusable Object-Oriented Software (1994) is a software engineering book describing software design patterns.The book was written by Erich Gamma, Richard Helm, Ralph Johnson, and John Vlissides, with a foreword by Grady Booch.
Any call to a class (static or constructor call), triggers the static constructor execution. Static constructors are thread safe and implement a singleton pattern. When used in a generic programming class, static constructors are called at every new generic instantiation one per type. [8]: 38 [4]: 111 Static variables are instantiated as well.