🧩 Microservices with Orchestration & Choreography (Spring Boot)

This repository demonstrates two microservices communication patterns using Spring Boot:

• 🎼 Orchestration Pattern — Centralized control using REST calls
• 💃 Choreography Pattern — Decentralized, event-driven using Apache Kafka

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🏗️ Project Structure

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🔧 Tech Stack

Feature	Technology
Language	Java 17
Framework	Spring Boot 3.x
Messaging (Choreo)	Apache Kafka
REST Clients	Spring Cloud OpenFeign
Build Tool	Maven
Architecture	Microservices

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🎼 Orchestration Pattern

In this approach, the order-service controls the flow:

1. Client → order-service
2. order-service → calls inventory, payment, and shipping via REST
3. Centralized decision-making and error handling

▶️ Run Services

cd order-orchestration/
# Run each service individually:
cd order-service && mvn spring-boot:run
cd inventory-service && mvn spring-boot:run
cd payment-service && mvn spring-boot:run
cd shipping-service && mvn spring-boot:run

💃 Choreography Pattern

In this approach, services listen to events and react accordingly:

1. order-service emits "order-created" event
2. inventory-service listens → emits "inventory-checked"
3. payment-service listens → emits "payment-completed"
4. shipping-service listens and ships

# ▶️ Prerequisite: Kafka | manually run
docker run -d --name zookeeper -p 2181:2181 zookeeper
docker run -d --name kafka -p 9092:9092 --link zookeeper \
    -e KAFKA_ZOOKEEPER_CONNECT=zookeeper:2181 \
    -e KAFKA_ADVERTISED_LISTENERS=PLAINTEXT://localhost:9092 \
    confluentinc/cp-kafka

# ▶️ Run Services
cd order-choreography/
cd order-service && mvn spring-boot:run
cd inventory-service && mvn spring-boot:run
cd payment-service && mvn spring-boot:run
cd shipping-service && mvn spring-boot:run

🐳 docker-compose.yml for Choreography Project

Added in root of order-choreography/ project. as dockerfile.yml