Tag: design

Why Refreshing L1 Cache Using a Scheduler is a Bad Idea

Building Scalable and Consistent Microservices Caching Architectures Caching is one of the most effective techniques for improving application performance. Modern microservices often implement a multi-level cache architecture: L1 Cache: In-memory cache inside the application (EhCache, Caffeine) L2 Cache: Distributed cache such as Redis or GemFire Database: The system of record While implementing L1 caching, many teams adopt a seemingly simple…

AI for Java Architects – Part 9

LangChain and LangGraph for Java Architects: Building Production AI Workflows "LLMs provide intelligence. Frameworks provide engineering." Introduction In the previous articles, we learned: Part 1 — LLM Fundamentals Part 2 — Embeddings and Vector Databases Part 3 — RAG Part 4 — Spring AI RAG Applications Part 5 — Prompt Engineering Part 6 — Spring AI Deep Dive Part 7…

Flyweight Design Pattern in Java: Reducing Memory Usage by Sharing Common Object State

Description / Meta Description Learn the Flyweight Design Pattern in Java with practical examples. Understand how Flyweight reduces memory consumption by sharing common object state, improves scalability, and powers systems like Java String Pool, caching frameworks, gaming engines, and large-scale enterprise applications. Flyweight Design Pattern in Java: Reducing Memory Usage by Sharing Common Object State In the previous article, we…

Proxy Design Pattern in Java: Controlling Access to Objects Without Changing Their Behavior

Description / Meta Description Learn the Proxy Design Pattern in Java with practical examples. Understand how Proxy controls access to objects, enables lazy loading, caching, security, remote calls, and how frameworks like Spring AOP, Hibernate, and microservices rely heavily on Proxy implementations. Proxy Design Pattern in Java: Controlling Access to Objects Without Changing Their Behavior In the previous article, we…

Facade Design Pattern in Java: Simplifying Complex Systems Behind a Single Interface

Description / Meta Description Learn the Facade Design Pattern in Java with practical examples. Understand how Facade simplifies complex subsystems, reduces coupling, improves maintainability, and why frameworks like Spring's JdbcTemplate, RestTemplate, and Hibernate rely heavily on Facade principles. Facade Design Pattern in Java: Simplifying Complex Systems Behind a Single Interface In the previous article, we explored the Decorator Pattern, which…

Decorator Design Pattern in Java: Adding New Behavior Without Modifying Existing Code

Description / Meta Description Learn the Decorator Design Pattern in Java with practical examples. Understand how to add functionality dynamically without modifying existing classes. Discover real-world examples from Java I/O, Spring Framework, and enterprise applications. Decorator Design Pattern in Java: Adding New Behavior Without Modifying Existing Code In the previous article, we explored the Adapter Pattern, which helps incompatible systems…

Adapter Design Pattern in Java: Making Incompatible Interfaces Work Together

Description / Meta Description Learn the Adapter Design Pattern in Java with practical examples. Understand how Adapter helps integrate legacy systems, third-party APIs, and incompatible interfaces without modifying existing code. Discover real-world examples from Spring, Java libraries, and enterprise applications. Adapter Design Pattern in Java: Making Incompatible Interfaces Work Together In the previous articles, we completed all five Creational Design…

Gang of Four (GoF) Design Patterns Explained: Why Design Patterns Matter in Modern Software Development

Learn what Gang of Four (GoF) Design Patterns are, why software design patterns are needed, common engineering problems they solve, and an overview of all 23 GoF patterns with practical Java examples including Strategy and Object Creation patterns. Gang of Four (GoF) Design Patterns Explained: Why Design Patterns Matter in Modern Software Development If you've worked on enterprise applications long…

Java – Design Patterns

Common Design Patterns The Java API and applications are built using many common design patterns and conventions. Some of them represent original GoF patterns. Singleton Factory Builder Adapter Facade Proxy Observer Command Iterator Singleton A Singleton is a class for which we can have only one instance. This is roughly the equivalent of a class having all static methods. Note…