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Java Design Patterns
    Anti-Corruption Layer Pattern in Java: Ensuring System Integrity Amidst Legacy Systems

    Also known as

    • ACL
    • Interface layer
    • Translation layer

    Intent of Anti-Corruption Layer Design Pattern

    The Anti-Corruption Layer (ACL) is a crucial design pattern in Java development, particularly for system integration and maintaining data integrity. Implement a façade or adapter layer between different subsystems that don't share the same semantics. It translates between different data formats and systems, ensuring that the integration between systems does not lead to corruption of business logic or data integrity.


    iluwatarAbout 4 minIntegrationArchitectureDecouplingIntegrationIsolationLayered architectureMigrationModernizationRefactoringWrapping
    Business Delegate Pattern in Java: Simplifying Business Service Interaction

    Also known as

    • Service Representative

    Intent of Business Delegate Design Pattern

    The Business Delegate pattern is a structural design pattern in Java that adds an abstraction layer between the presentation and business tiers. By using the pattern we gain loose coupling between the tiers and encapsulate knowledge about how to locate, connect to, and interact with the business objects that make up the application.


    iluwatarAbout 3 minStructuralBusinessDecouplingDelegationEnterprise patternsLayered architecture
    Clean Architecture - A Software Maintainable Architectural style.

    Intent of Clean Architecture.

    To organize the system so that the core business logic remains independent from external concerns and frameworks.

    Detailed Explanation of Clean Architecture Pattern with Real-World Examples

    Real-world example

    Imagine a large pizza chain with multiple ordering channels—web, mobile app, phone calls, and in-store kiosks. The core “pizza domain” logic (calculating prices, preparing orders, managing loyalty points) is kept entirely separate from the user interfaces and storage mechanisms. As a result, the chain can add or change the ordering channel (for example, introducing a chatbot or swapping out the database) without altering the fundamental pizza-ordering rules, thanks to the layered boundaries and strict dependency rules of Clean Architecture.


    iluwatarAbout 4 minArchitecturalArchitectureDecouplingDomainInversion of controlLayered architectureModularityTesting
    Data Access Object Pattern in Java: Streamlining Database Interaction

    Also known as

    • Data Access Layer
    • DAO

    Intent of Data Access Object Design Pattern

    The Data Access Object (DAO) design pattern aims to separate the application's business logic from the persistence layer, typically a database or any other storage mechanism. By using DAOs, the application can access and manipulate data without being dependent on the specific database implementation details.


    iluwatarAbout 5 minStructuralAbstractionData accessData processingDecouplingLayered architecturePersistence
    Data Transfer Object Pattern in Java: Simplifying Data Exchange Between Subsystems

    Also known as

    • Transfer Object
    • Value Object

    Intent of Data Transfer Object Design Pattern

    The Data Transfer Object (DTO) pattern is used to transfer data between software application subsystems or layers, particularly in the context of network calls or database retrieval in Java applications. It reduces the number of method calls by aggregating the data in a single transfer.


    iluwatarAbout 4 minStructuralClient-serverData transferDecouplingLayered architectureOptimization
    Domain Model Pattern in Java: Building Robust Business Logic

    Also known as

    • Conceptual Model
    • Domain Object Model

    Intent of Domain Model Design Pattern

    The Domain Model pattern aims to create a conceptual model in your software that matches the real-world system it's designed to represent. It involves using rich domain objects that encapsulate both data and behavior relevant to the application domain, ensuring business logic is centralized.


    iluwatarAbout 5 minStructuralAbstractionBusinessData processingDomainEncapsulationLayered architecturePersistencePolymorphism
    Front Controller Pattern in Java: Centralizing Web Request Handling

    Also known as

    • Centralized Request Handling

    Intent of Front Controller Design Pattern

    The Front Controller design pattern aims to provide a centralized entry point for handling all incoming web requests. This pattern ensures consistent and efficient request routing and management across a Java web application.


    iluwatarAbout 3 minArchitecturalArchitectureDecouplingEnterprise patternsLayered architectureWeb development
    Hexagonal Architecture Pattern in Java: Decoupling Core Logic for Enhanced Flexibility

    Also known as

    • Ports and Adapters

    Intent of Hexagonal Architecture Design Pattern

    Hexagonal Architecture, also known as Ports and Adapters, is a design pattern in Java that promotes decoupling of core business logic from external interfaces like databases and user interfaces. This architectural approach enhances maintainability and testability of software systems.


    iluwatarAbout 6 minArchitecturalDecouplingLayered architecture
    Intercepting Filter Pattern in Java: Enhancing Request Processing in Web Applications

    Intent of Intercepting Filter Design Pattern

    The Intercepting Filter Pattern in Java is a powerful design pattern that allows for efficient web request handling. This pattern enables the application of multiple filters in a filter chain to process and modify requests and responses.

    Detailed Explanation of Intercepting Filter Pattern with Real-World Examples


    iluwatarAbout 3 minArchitecturalAPI designDecouplingLayered architecturePerformanceSecurityWeb development
    Layered Architecture Pattern in Java: Building Scalable and Maintainable Applications

    Also known as

    • N-Tier Architecture

    Intent of Layered Architecture Design Pattern

    The Layered Architecture design pattern helps organize applications into groups of subtasks at different levels of abstraction, facilitating independent development and maintenance of each layer.


    iluwatarAbout 3 minArchitecturalAbstractionDecouplingEnterprise patternsLayered architectureScalability
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