integration questions

[gocandra]

i'm building a simple system consisting of an orchestrator and three microservices.
should I define event classes in each service? or should I create an npm module with all message (commands / events) definitions?
I'm thinking something like this

• @org/bus-module

1. init method to instantiate rabbitmq
2. export all message definitions
3. publish method that abstracts rabbitmq connection and bus.publish() method
4. export HandlesMessage method as is

• service#1 / servie#2 / servie#3

1. import @org/bus-module
2. on server start init rabbitmq
3. on each controller import HandlesMessage and corresponding event class

• orchestrator

1. import @org/bus-module
2. on server start init rabbitmq and sql
3. on each controller import publish method and corresponding command class

Would this implementation be correct? Is there any example of a different and better way?

[adenhertog]

should I create an npm module with all message (commands / events) definitions

This is usually the easier path to take. A separate module that only contains your message definitions and is imported into your orchestrator and services.

This way your dependencies will stay loosely coupled, whilst still allowing any service to publish/subscribe to any message.

[gocandra]

Fantastic! thank you very much for the quick reply! I'll try and contribute an article with a concrete implementation.
cheers