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What are drawbacks or disadvantages of singleton pattern? Singleton pattern should only be used to guarantee that one and only one instance of a given class exists during run time People think Singleton is evil because they are using it for globals It is because of this confusion that Singleton is looked down upon Please, don't confuse Singletons and globals
What are the real world applications of the singleton pattern? public sealed class Singleton { Singleton() { } public static Singleton Instance { get { return Nested instance; } } class Nested { Explicit static constructor to tell C# compiler not to mark type as beforefieldinit static Nested() { } internal static readonly Singleton instance = new Singleton(); } }
What is the best way of implementing a singleton in Python? def singleton(cls): instance=cls() cls __new__ = cls __call__= lambda cls: instance cls __init__ = lambda self: None return instance Use it as a decorator on a class that should be a singleton Like this: @singleton class MySingleton: # This is similar to the singleton = lambda c: c() decorator in
On design patterns: When should I use the singleton? A Singleton candidate must satisfy three requirements: controls concurrent access to a shared resource access to the resource will be requested from multiple, disparate parts of the system there can be only one object If your proposed Singleton has only one or two of these requirements, a redesign is almost always the correct option
java - How to create a singleton class - Stack Overflow I've a properties file containing some keys value pairs, which is need across the application, that is why I was thinking about a singleton class This class will load the properties from a file and keep it and you can use it from anywhere in the application Don't use a singleton
How is Meyers implementation of a Singleton actually a Singleton I have been reading a lot about Singletons, when they should and shouldn't be used, and how to implement them safely I am writing in C++11, and have come across the Meyer's lazy initialized implementation of a singleton, as seen in this question This implementation is: static Singleton instance() { static Singleton s; return s; }
Different ways to write singleton in Java - Stack Overflow I think your problem is that you're mixing singleton and lazy initialization A singleton can be implemented with different initialization strategies: initialization on class loading; lazy initialization that uses double checked locking; lazy initialization with single checking (with possible repeated initialization)