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Modular Programming: Combining Modules of Various Functionality

Modular programming structures a software application into separate, interchangeable components (modules), where each module encapsulates a specific, self-contained functionality (e.g., authentication, payment processing, data access, or notification). Combining these modules relies on clear interface contracts, dependency injection, and centralized orchestration or event buses to ensure loose coupling and high cohesion.

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Combining Multi-Functionality Modules

When integrating modules with distinct responsibilities, common integration patterns include:

• API Gateway / Service Orchestrator: Acts as a single entry point that delegates requests to specific functional modules.
• Dependency Injection (DI): Passes required module dependencies into target modules at runtime rather than hardcoding them.
• Event-Driven Integration: Modules communicate asynchronously by publishing and subscribing to events over an event bus without needing direct references to each other.
• Shared Interfaces / Contracts: Modules interact solely through abstract interfaces or APIs, hiding internal execution details.

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Architecture Flow

The visual structure below demonstrates how an Orchestration Core coordinates discrete modules—Authentication, Payment, Notification, and Data Persistence—to execute business workflows seamlessly.

System Architecture & Execution Flow

Client Request

↓ 1. Dispatches Request

API Gateway / Orchestration Core

↓ 2. Delegates Execution

Auth Module

• JWT Verifier
• Role RBAC

Payment Module

• Stripe Adapter
• Transaction Ledger

Notification Module

• Email Dispatcher
• SMS Gateway

Data Module

• ORM Repository
• Cache Layer

↓ 3. Async Communication

Centralized Event Bus