implementation-guide.md

technology	Microservices
domain	Architecture
level	Senior/Architect
version	Agnostic
tags	architecture implementation microservices best-practices
ai_role	Senior Architect
last_updated	2026-03-29

Microservices - Implementation Guide

Code patterns and Anti-patterns

Entity Relationships

classDiagram
    class Gateway {
        +route()
    }
    class Service {
        +process()
    }
    Gateway --> Service : RPC/HTTP

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1. Synchronous Cascading Calls

❌ Bad Practice

// Synchronous calls block the entire chain
async function processOrder() {
    await inventoryService.reserve();
    await paymentService.charge();
    await notificationService.sendEmail();
}

⚠️ Problem

Avoid synchronous cascading calls between services. When processOrder calls inventory, payment, and notification synchronously over HTTP/RPC, it creates tight coupling and fragility. If notificationService fails or is slow, the entire order process fails or hangs, tying up resources.

✅ Best Practice

// Asynchronous event-driven communication
async function processOrder() {
    await inventoryService.reserve();
    await paymentService.charge();

    // Publish an event instead of making a direct synchronous call
    await messageBroker.publish('OrderPaid', { orderId: 123 });
}

🚀 Solution

Important

Use Event-Driven Architecture for cross-service communication when immediate consistency is not strictly required. By publishing an OrderPaid event, the notificationService MUST react to it asynchronously. This decouples the services, improves fault tolerance, and reduces the latency of the initial processOrder request.