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.

Also known as

• Object-Relational Mapping (ORM)

Intent of the Data Mapper Pattern

The Data Mapper pattern aims to create an abstraction layer between the database and the business logic, allowing them to evolve independently. It maps data from the database objects to in-memory data structures and vice versa, minimizing direct dependencies between the application's core logic and the underlying database structure. This decoupling is essential in promoting maintainability and flexibility in Java programming.

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.

Intent of Interpreter Design Pattern

The Interpreter design pattern is used to define a grammatical representation for a language and provides an interpreter to handle this grammar. This pattern is useful in scenarios where a specific set of rules or grammar needs to be interpreted and acted upon, such as in arithmetic expressions or scripting languages.

Also known as

• Monetary Value Object

Intent of Money Design Pattern

Encapsulate monetary values and their associated currency in a domain-specific object.

Detailed Explanation of Money Pattern with Real-World Examples

Real-world example

Imagine an online gift card system, where each gift card holds a specific balance in a particular currency. Instead of just using a floating-point value for the balance, the system uses a Money object to precisely track the amount and currency. Whenever someone uses the gift card, it updates the balance with accurate calculations that avoid floating-point rounding errors, ensuring the domain logic stays consistent and accurate.

Also known as

• Transparent Objects

Intent of Naked Objects Design Pattern

To enable the rapid development of maintainable systems by representing all business objects directly and automatically creating the user interface from these definitions. Naked Objects design pattern is essential for developers aiming to align user interfaces with domain models seamlessly.

Also known as

• Filter
• Criteria

Intent of Specification Design Pattern

Encapsulate business rules and criteria that an object must satisfy to enable checking these rules in various parts of the application.

Detailed Explanation of Specification Pattern with Real-World Examples

Also known as

• Fluent Builder

Intent of Step Builder Design Pattern

The Step Builder pattern in Java is an advanced technique to create complex objects with clarity and flexibility. It is perfect for scenarios requiring meticulous step-by-step object construction.

Also known as

• Scripted Transactions

Intent of Transaction Script Design Pattern

The Transaction Script pattern in Java organizes business logic by procedures where each procedure handles a single request from the presentation.

Detailed Explanation of Transaction Script Pattern with Real-World Examples

Also known as

• Embedded Value
• Immutable Object
• Inline Value
• Integrated Value

Intent of Value Object Design Pattern

The Value Object pattern in Java creates immutable objects that represent a descriptive aspect of the domain with no conceptual identity. It aims to enhance performance and reduce memory overhead by storing frequently accessed immutable data directly within the object that uses it, rather than separately.