The Singleton design pattern is one of software development’s most widely used creational design patterns. It ensures that a class has only one instance while providing a global access point to that instance. This pattern is particularly useful when a single object is needed to coordinate actions across a system, such as managing database connections, logging, or configurations.
Key Concepts of Singleton Pattern
Single Instance: Ensures that only one instance of a class is created.
Global Access: Provides a global access point to the instance.
Lazy Initialization: The instance is created only when it is first needed.
Problem Statement
In many applications, certain resources should be managed by a single instance to ensure consistency. Creating multiple instances of such resources can lead to:
Resource Consumption: Additional memory and CPU usage.
Inconsistent State: Multiple instances may lead to data inconsistencies.
Complex Management: Managing multiple instances can be error-prone.
