Tag: designpatterns

Building Event-Driven Microservices with Spring Cloud Function: From Java 8 Functional Interfaces to Cloud-Native Applications

Description / Meta Description Learn how Java 8 Functional Interfaces such as Function, Consumer, Supplier, Predicate, BiFunction, and BiConsumer evolved into the foundation of modern cloud-native microservices. Understand how Spring Cloud Function enables developers to build event-driven applications that can run as REST APIs, Kafka consumers, RabbitMQ listeners, AWS Lambda functions, and Azure Functions using the same business logic. One…

CompletableFuture in Java: The Evolution of Asynchronous Programming from Threads to Virtual Threads

Description / Meta Description Learn CompletableFuture in Java from the ground up. Understand the evolution of asynchronous programming from Thread, Runnable, Callable, Future, ExecutorService, CompletableFuture, and Virtual Threads. Explore real-world examples, execution flows, performance benefits, best practices, and common pitfalls in modern Java applications. Modern applications rarely execute a single task at a time. A typical request may involve: Database…

Choosing the Right Design Pattern: A Practical Decision Matrix for Java Developers

Description / Meta Description Confused about when to use Strategy, Factory, Observer, State, or Chain of Responsibility? This practical guide helps Java developers choose the right Gang of Four design pattern based on real-world scenarios, architecture challenges, and enterprise application requirements. Congratulations! If you've followed this series from beginning to end, you've now explored all 23 Gang of Four Design…

Advanced Behavioral Design Patterns in Java: Iterator, Memento, Visitor, and Interpreter

Description / Meta Description Complete your Gang of Four Behavioral Design Pattern journey by learning Iterator, Memento, Visitor, and Interpreter patterns. Understand where these advanced patterns fit, their real-world applications, advantages, limitations, and how modern Java frameworks implement similar concepts. Completing the Behavioral Design Patterns Journey Throughout this series we've covered the most frequently used behavioral patterns: Strategy Observer Command…

Mediator Design Pattern in Java: Centralizing Communication Between Objects to Reduce Coupling

Description / Meta Description Learn the Mediator Design Pattern in Java with practical examples. Understand how Mediator centralizes communication between objects, reduces dependencies, simplifies complex interactions, and powers chat applications, workflow engines, UI frameworks, air traffic control systems, and enterprise orchestration platforms. Mediator Design Pattern in Java: Centralizing Communication Between Objects to Reduce Coupling In the previous article, we explored…

Template Method Design Pattern in Java: Defining the Skeleton of an Algorithm While Allowing Customization

Description / Meta Description Learn the Template Method Design Pattern in Java with practical examples. Understand how Template Method defines a standard workflow while allowing subclasses to customize individual steps. Discover real-world applications in Spring Framework, batch processing systems, enterprise workflows, and framework design. Template Method Design Pattern in Java: Defining the Skeleton of an Algorithm While Allowing Customization In…

State Design Pattern in Java: Changing Object Behavior Dynamically Based on Its Current State

Description / Meta Description Learn the State Design Pattern in Java with practical examples. Understand how State eliminates complex state-based if-else logic, enables clean state transitions, and powers workflow engines, order management systems, approval processes, ticketing systems, and enterprise applications. State Design Pattern in Java: Changing Object Behavior Dynamically Based on Its Current State In the previous article, we explored…

Chain of Responsibility Design Pattern in Java: Building Flexible Request Processing Pipelines

Description / Meta Description Learn the Chain of Responsibility Design Pattern in Java with practical examples. Understand how requests flow through multiple handlers, how Spring Security, Servlet Filters, API Gateways, and validation frameworks use this pattern, and why it helps build flexible and extensible processing pipelines. Chain of Responsibility Design Pattern in Java: Building Flexible Request Processing Pipelines In the…

Command Design Pattern in Java: Encapsulating Requests as Objects

Description / Meta Description Learn the Command Design Pattern in Java with practical examples. Understand how Command encapsulates requests as objects, enables undo operations, task scheduling, workflow execution, and decouples request senders from receivers. Discover real-world examples from Spring Batch, Quartz Scheduler, workflow engines, and enterprise applications. Command Design Pattern in Java: Encapsulating Requests as Objects In the previous article,…

Observer Design Pattern in Java: Building Event-Driven Systems Through Publish-Subscribe Communication

Description / Meta Description Learn the Observer Design Pattern in Java with practical examples. Understand how Observer enables publish-subscribe communication, event-driven architectures, loose coupling, and real-time notifications. Discover real-world applications in Spring Events, Kafka consumers, stock market systems, and microservices. Observer Design Pattern in Java: Building Event-Driven Systems Through Publish-Subscribe Communication In the previous article, we explored the Strategy Pattern,…