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Reflection Knowledge Primer Determining if one type can be assigned to another (inheritance relationships): public class ParentClass { } public class ChildClass : ParentClass { } ... Type parentType = typeof(ParentClass); Type childType = typeof(ChildClass); // Check if the specified type can be assigned to this type if(parentType.IsAssignabl ...

Singleton Pattern Ensures a class has only one instance while providing a global access point. Eager Enitialization public class EagerSingleton { private EagerSingleton() {} private static final EagerSingleton INSTANCE = new EagerSingleton(); public static EagerSingleton getInstance() { return INSTANCE; } } La ...

Overview The Singleton pattern ensures a class has exact one instance and provides a global point of access to it. The core challenge is: how to bypass traditional constructors and guarantee a single instance? Clients calling a class should not concern themselves with instance count restrictions—this responsibility falls on the class designer, ...

The foundation of Spring's bean management system revolves around several key components that work together to define, instantiate, and manage beans. Below is a simplified implemantation illustrating these core concepts. BeanDefinition: Metadata Container for Beans BeanDefinition acts as a metadata holder for a bean, storing information such as ...

The Singleton pattern represents one of the most fundamental design patterns in software engineering, providing an efficient mechanism for ensuring that exact one instance of a class exists throughout the application lifecycle. Core Principles of Singleton Implementation There are two primary approaches to implementing the Singleton pattern: E ...

In previous articles, we've covered the foundational steps for bean preparation, including bean definition processing and FactoryBean identification. Building upon this knowledge, we can now dive deeper into the implementation logic of the getBean method and gain better insights into how the createBean method works. Usage of getBean Before divi ...

Thread safety in Spring beans depends on their scope. Spring supports multiple bean scopes, with Singleton and Prototype being the most commonly used. By default, Spring beans are singletons, meaning a single instance exists per Spring IoC container. In contrast, prototype-scoped beans create a new instance each time they are requested from the ...

The Singleton pattern restricts a class to a single instance and provides a global point of access to that instance. This pattern is characterized by a private constructor, a private static reference to the single instance, and a public static method (often named getInstance) that returns the instance. Eager Initialization In the eager initia ...

Overview The Singleton pattern ensures that a class has only one instance throughout an application while providing a global access point to that instance. This is particularly useful for resource-intensive objects that should be shared, such as database connection pools, configuration managers, or logging utilities. For example, SessionFactory ...

============================================================ Creational Patterns Singleton Pattern Ensures a class has only one instance, and provides a global point of access to it. /** * Eager initialization */ public class Singleton { private static final Singleton INSTANCE = new Singleton(); private Singleton() {} public sta ...