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Application_Layer.md

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graph LR
    Application_Commands["Application Commands"]
    Application_Queries["Application Queries"]
    Command_Handlers["Command Handlers"]
    Query_Handlers["Query Handlers"]
    Application_Query_Results["Application Query Results"]
    Interface_Layer["Interface Layer"]
    Domain_Layer["Domain Layer"]
    Infrastructure_Layer["Infrastructure Layer"]
    Interface_Layer -- "produces" --> Application_Commands
    Command_Handlers -- "processes" --> Application_Commands
    Interface_Layer -- "produces" --> Application_Queries
    Query_Handlers -- "processes" --> Application_Queries
    Application_Queries -- "defines structure of" --> Application_Query_Results
    Command_Handlers -- "interacts with" --> Domain_Layer
    Command_Handlers -- "interacts with" --> Infrastructure_Layer
    Query_Handlers -- "interacts with" --> Infrastructure_Layer
    Query_Handlers -- "produces" --> Application_Query_Results
    Application_Query_Results -- "are consumed by" --> Interface_Layer
    click Domain_Layer href "https://github.com/CodeBoarding/GeneratedOnBoardings/blob/main/python-archetype/Domain_Layer.md" "Details"
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Details

This project follows a Clean Architecture pattern, separating concerns into distinct layers: Interface, Application, Domain, and Infrastructure. The Interface Layer acts as the entry point, handling user requests and initiating operations. It produces Application Commands for write operations and Application Queries for read operations. The Application Layer contains Command Handlers and Query Handlers that process these commands and queries, respectively. Command Handlers orchestrate business logic by interacting with the Domain Layer to enforce core business rules and persist changes through the Infrastructure Layer. Query Handlers retrieve data from the Infrastructure Layer and transform it into Application Query Results, which are then consumed by the Interface Layer. The Domain Layer encapsulates the core business logic, entities, and repositories, remaining independent of external concerns. The Infrastructure Layer provides concrete implementations for persistence, external services, and other technical concerns, serving as an adaptable detail. This layered approach promotes maintainability, testability, and flexibility by clearly defining responsibilities and dependencies.

Critical Interaction Pathways

  1. Command Flow: Interface Layer -> Application Commands -> Command Handlers -> Domain Layer (business logic) -> Infrastructure Layer (persistence).
  2. Query Flow: Interface Layer -> Application Queries -> Query Handlers -> Infrastructure Layer (data retrieval) -> Application Query Results -> Interface Layer.

Application Commands

Immutable Data Transfer Objects (DTOs) that represent the intent and data for write operations. They are the input for Command Handlers, encapsulating the request to change the system's state.

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Application Queries

Immutable Data Transfer Objects (DTOs) that encapsulate the criteria for read operations and define the structure of the expected results. They are the input for Query Handlers, representing a request for information without side effects.

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Command Handlers

Components responsible for processing Application Commands. They orchestrate business logic by interacting with the Domain Layer (e.g., aggregates, domain services) and persist changes through Infrastructure Layer ports (e.g., repositories). They manage transactions and ensure data consistency.

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Query Handlers

Components responsible for processing Application Queries. They retrieve data from the Infrastructure Layer (e.g., read models, repositories) and transform it into Application Query Results. They explicitly do not modify the system state, adhering to CQRS principles.

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Application Query Results

Data Transfer Objects (DTOs) that define the structure for the expected output of Application Queries. These are the structured responses returned to the Interface Layer after a query has been processed.

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Interface Layer

Initiates operations and consumes results from the Application Layer.

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Domain Layer [Expand]

Encapsulates core business rules.

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Infrastructure Layer

Handles persistence and external services.

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FAQ