Singleton Design Pattern

Today, without further ado, I will talk about Singleton Design Pattern and finish my article with a sample code. You can access the code by clicking the GitHub link at the end of the article.

What is Singleton Design Pattern?

The singleton design pattern ensures that only one instance of a class can be created, providing a global point of access to that instance throughout the application.

What is goal of Singleton Design Pattern?

The aim of the singleton design pattern is to ensure that only one instance of a class is created and provide a global point of access to that instance. It aims to control the instantiation process and maintain a single shared instance across the application.

The advantages of the singleton design pattern are:

1. Ensuring a single instance: The singleton pattern guarantees that only one instance is created. This ensures that there is only one object at any given time, which can be useful in resource-intensive operations or accessing shared data.

2. Easy accessibility: The singleton object is accessible at a global level in the application, making it easy to access from anywhere in the code. This helps in keeping the code clean and readable.

3. Optimized memory usage: Singleton keeps only one instance when needed, preventing the cost of creating new objects each time. This optimizes memory usage and improves performance.

The disadvantages of the singleton design pattern are:

1. Testing challenges: When a singleton object is used in different parts of the application, it can introduce difficulties in testing. This is because the object may be tightly coupled with other components, making testing more challenging.

2. Lack of flexibility: The singleton object can restrict flexibility in cases where multiple instances or subclasses may be required. Using a singleton can make it harder to adapt to future changes.

3. Thread-related issues: If used in a multi-threaded environment, the singleton object needs to be properly guarded against concurrent access. Otherwise, concurrency issues and unexpected results may occur.

These advantages and disadvantages should be considered when using the singleton design pattern. Depending on the application’s needs and requirements, the singleton pattern may be suitable, or an alternative pattern may be more appropriate.

Show the sample code https://github.com/muratyildirimm/Singleton