Concept: Packages

Note

Standard Java package layout: controller, service, repo, model, util, interfaces.

Parents (up to 3 levels)

SampleCode (c_sample_code)
ComposableApps (c_composable_apps)

Children (has_subtopic)

interfaces0060
util0061
model0062
repo0063
service0064
controller0065

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None

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c_packages

Label

Packages

Pinned

Rank

0070

Created

2025-09-24T09:42:03.585Z

Updated

2026-01-16T03:43:46.324Z

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# Packages

Standard Java package layout: controller, service, repo, model, util, interfaces.

## interfaces

All external touchpoints: AI (LLM, image gen), communication (WhatsApp, Email), storage, search. Structured into ports (interfaces) and adapters (vendor-specific implementations).

## util

Cross-cutting utilities like SimpleLogger, JsonHelper, ViewHelper. Small, generic helpers used across the application but containing no domain or business rules.

## model

Data Transfer Objects (DTOs) and Plain Old Java Objects (POJOs). Storage-agnostic definitions of entities used in services, controllers, and repos. Holds enums, IDs, and simple fields.

## repo

Persistence layer for Firestore or any database. Implements CRUD, indexing, and data retrieval. Contains no business rules—just pure persistence logic.

## service

Business orchestration and workflow logic. Coordinates between repos and external interfaces. Contains business rules but no HTTP or database code.

## controller

Contains REST controllers for JSON APIs and page controllers for simple HTML views. Only handles HTTP mapping, validation, and delegates to services. No business logic.

Concept: Packages

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