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How singleton works in multi threading applications?
Now coming to your question: if you share your singleton object among multiple threads and access it concurrently, every single thread will execute Singleton object’s portion of code, wrapped in its own execution. Also if you write a Thread.
What is the Singleton pattern in object oriented programming when would you use it?
In software engineering, the singleton pattern is a software design pattern that restricts the instantiation of a class to one “single” instance. This is useful when exactly one object is needed to coordinate actions across the system. The term comes from the mathematical concept of a singleton.
What are the ways through which we can achieve thread safety in Singleton design pattern?
There are three ways through which we can achieve thread safety.
- Create the instance variable at the time of class loading.
- Synchronize the getInstance() method.
- Use synchronized block inside the if loop and volatile variable.
What do you understand by Singleton design pattern explain its structure with the help of example?
The singleton pattern is one of the simplest design patterns. Sometimes we need to have only one instance of our class for example a single DB connection shared by multiple objects as creating a separate DB connection for every object may be costly.
Does Singleton class support multithreading?
It can be used in a single threaded environment because multiple threads can break singleton property because they can access get instance method simultaneously and create multiple objects.
What is volatile multithreading?
Volatile keyword is used to modify the value of a variable by different threads. It is also used to make classes thread safe. It means that multiple threads can use a method and instance of the classes at the same time without any problem. The volatile keyword can be used either with primitive type or objects.
Why is the Singleton pattern considered to be an anti pattern?
Following are the resons why Singleton is considered as an anti-pattern: Singletons are basically used as global variables. Use of Singletons make it difficult to unit test the classes because for unit testing,classes must be loosely coupled allowing classes to be tested individually.
How would you implement a singleton design pattern in C?
Implementation Guidelines of Singleton Design Pattern in C#:
- You need to declare a constructor that should be private and parameterless.
- The class should be declared as sealed which will ensure that it cannot be inherited.
How do you implement singleton design pattern in Java?
To create the singleton class, we need to have static member of class, private constructor and static factory method.
- Static member: It gets memory only once because of static, itcontains the instance of the Singleton class.
- Private constructor: It will prevent to instantiate the Singleton class from outside the class.