What are the disadvantages of the Singleton pattern?
What are the disadvantages of the Singleton pattern?
Disadvantages of a Singleton Pattern
- Unit testing is more difficult (because it introduces a global state into an application).
- This pattern reduces the potential for parallelism within a program, because to access the singleton in a multi-threaded system, an object must be serialized (by locking).
What is the problem that Singleton pattern solve?
Problem. The Singleton pattern solves two problems at the same time, violating the Single Responsibility Principle: Ensure that a class has just a single instance. Why would anyone want to control how many instances a class has?
What are the problems with Singleton?
Singletons hinder unit testing: A Singleton might cause issues for writing testable code if the object and the methods associated with it are so tightly coupled that it becomes impossible to test without writing a fully-functional class dedicated to the Singleton.
What are the advantages and disadvantages of Singleton design pattern?
Instance control: Singleton prevents other objects from instantiating their own copies of the Singleton object, ensuring that all objects access the single instance. Flexibility: Since the class controls the instantiation process, the class has the flexibility to change the instantiation process.
What are the consequences of applying the GOF Singleton pattern?
Some consequences of the Singleton pattern include controlling access, permitting subclassing, and enhancing flexibility.
What are the drawbacks for Singleton class Mcq?
What are the drawbacks for singleton class? a) Many languages do not allow classes to be values assignable to variables. Explanation: All are the drawbacks for the singleton class.
What is the meaning of singletons?
Definition of singleton 1 : a card that is the only one of its suit originally dealt to a player. 2a : an individual member or thing distinct from others grouped with it. b : an offspring born singly singletons are more common than twins.
What are the drawbacks for singleton class Mcq?
Which of the following is disadvantage in Singleton pattern Mcq?
Explanation: Singleton Class is the class that can have only one instance. Explanation: All are the drawbacks for the singleton class.
What are the consequences of applying the GOF Decorator Pattern?
The Decorator pattern provides a more flexible way to add responsibilities to a class than by using inheritance, since it can add these responsibilities to selected instances of the class. It also allows you to customize a class without creating subclasses high in the inheritance hierarchy.
What are the consequences of applying GOF factory method pattern?
Here are two additional consequences of the Factory Method pattern:
- Provides hooks for subclasses. Creating objects inside a class with a factory method is always more flexible than creating an object directly.
- Connects parallel class hierarchies.
What are the consequences of applying the GOF Singleton pattern Mcq?
| Q. | What are the consequences of applying the GOF Singleton pattern? |
|---|---|
| C. | it reduces of the class hierarchy as compared to the other factory design patterns |
| D. | it makes it easier for a certain family of objects to work together |
| Answer» a. it introduces thread safety issue when the singleton instance is instantiated on demand |
What is the benefit of using the singleton pattern?
What are the Advantages of using the Singleton Pattern in C#? The first and most important advantage of using the singleton design pattern in C# is that it takes care of concurrent access to the shared resource. It can be lazy-loaded and also has Static Initialization. To share common data i.e. As it provides a single global point of access to a particular instance, so it is easy to maintain.
Is singleton design pattern a code smell?
The Singleton is a creational design pattern that allows us to create a single instance of an object and to share that instance with all the users that require it. There is a common opinion that the Singleton pattern is not recommended because it presents a code smell, but there are some cases where it fits perfectly.
What problems does the singleton pattern solve?
The singleton design pattern is one of the twenty-three well-known “Gang of Four” design patterns that describe how to solve recurring design problems to design flexible and reusable object-oriented software, that is, objects that are easier to implement, change, test, and reuse.
What are the most common design patterns?
A Survey of Common Design Patterns Abstract Factory. The Abstract Factory is intended to provide a single interface for clients to use when they need to create a family of related objects without having to specify Adapter. Bridge. Builder. Chain of Responsibility. Command. Composite. Decorator. Facade. Factory Method.
