CODE_ORGANIZATION.md

Code Organization Guide

Overview

This document outlines the code organization principles and patterns used in the project.

Core Principles

1. Separation of Concerns

• Each module has a single responsibility
• Clear boundaries between layers
• Minimal dependencies between modules
• Clean and maintainable code

2. Type Safety

• Strong typing throughout
• Interface-driven development
• Runtime type checking
• Proper error handling

3. Modularity

• Self-contained modules
• Clear module interfaces
• Dependency injection
• Testable components

Layer Organization

1. API Layer

// Controller example
export class DataController {
    constructor(private dataService: DataService) {}

    async store(req: Request, res: Response) {
        const data = await this.dataService.store(req.body);
        res.json(data);
    }
}

2. Service Layer

// Service example
export class DataService {
    constructor(private repository: Repository<Data>) {}

    async store(data: DataInput): Promise<Data> {
        // Business logic
        return await this.repository.save(data);
    }
}

3. Data Layer

// Model example
@Entity()
export class Data {
    @PrimaryColumn()
    id: string;

    @Column()
    type: DataType;

    @Column('json')
    metadata: DataMetadata;
}

Code Style

1. Naming Conventions

// Interfaces
interface IDataService {
    store(data: DataInput): Promise<Data>;
}

// Classes
class DataService implements IDataService {
    // Implementation
}

// Enums
enum DataType {
    DOCUMENT = 'DOCUMENT',
    IMAGE = 'IMAGE'
}

2. Error Handling

// Custom error classes
export class AppError extends Error {
    constructor(
        public statusCode: number,
        message: string
    ) {
        super(message);
    }
}

// Error handling
try {
    await service.process();
} catch (error) {
    throw new AppError(500, error.message);
}

3. Async/Await

// Proper async/await usage
async function processData() {
    try {
        const data = await fetchData();
        return await processResult(data);
    } catch (error) {
        handleError(error);
    }
}

Testing Structure

1. Unit Tests

describe('DataService', () => {
    it('should store data', async () => {
        const result = await service.store(mockData);
        expect(result).toBeDefined();
    });
});

2. Integration Tests

describe('Data API', () => {
    it('should create new data', async () => {
        const response = await request(app)
            .post('/api/data')
            .send(mockData);
        expect(response.status).toBe(201);
    });
});

Documentation

1. JSDoc Comments

/**
 * Stores data in the repository
 * @param {DataInput} data - The data to store
 * @returns {Promise<Data>} The stored data
 * @throws {AppError} If storage fails
 */
async store(data: DataInput): Promise<Data> {
    // Implementation
}

2. Type Definitions

export interface DataInput {
    content: any;
    type: DataType;
    metadata?: Record<string, any>;
}

Version Control

1. Commit Messages

feat: add data encryption support
fix: resolve connection timeout issue
docs: update API documentation
test: add integration tests for data API

2. Branch Naming

feature/data-encryption
bugfix/connection-timeout
docs/api-updates
test/integration-tests