poc-on-orchestration-and-choreography

Proof of Concept on orchestration and choreography patterns to model business processes based on the example posted in this very inspirational article “orchestration and choreography BPM design patterns”

Main concepts

• orchestration and choreography BPM design patterns
• Domain Driven Design
• Saga, a.k.a. Event Driven Architecture
• Command Query Responsibility Segregation
• Microservices

Context Map

The Context Map for the example described in this article is:

• Finance
  • Payments
• Sales
  • Order
  • Checkout
• Products
  • Inventory
  • Shipment

Each secod level element is actually implemented as a microservice.

Technology stack

• Spring Boot (Microservices)
• Camunda BPM (Busines Process Orchestation)
• Apache Kafka (Business Process Choreography)

Run the PoC

Pre-requisites:

• install a git client
• install java 1.8+
• install Apache Maven 3+
• install Apache Kafka

Clone the repo

git clone https://github.com/jantoniucci/poc-on-orchestration-and-choreography.git
cd poc-on-orchestration-and-choreography

Run a full build

mvn install

At your Kafka’s home directory, start zookeeper

bin/zookeeper-server-start.sh config/zookeeper.properties

start kafka

bin/kafka-server-start.sh config/server.properties

create a topic “retail”

bin/kafka-topics.sh --create --zookeeper localhost:2181 --replication-factor 1 --partitions 1 --topic retail

Check existing topics

bin/kafka-topics.sh --list --zookeeper localhost:2181

Start the microservices components one by one

mvn -f checkout exec:java
mvn -f inventory exec:java
mvn -f monitor exec:java
mvn -f order exec:java
mvn -f payment exec:java
mvn -f shipping exec:java

Now you can place an order via http://localhost:8090
You can inspect Order via http://localhost:8091
You can inspect Payment via http://localhost:8092
You can inspect all events going on via http://localhost:8095