# @moirae/rabbitmq

A Moirae publisher leveraging RabbitMQ as a transport layer providing:
- RabbitMQConnection: a connection instance for RabbitMQ. Can be resused (e.g. PubSub)
- RabbitMQPublisher: Override the default `PUBLISHER` token
- RabbitPubSubEngine: Override the default `EVENT_PUBSUB_ENGINE` token

## Lifecycle
**`onModuleInit`**
- Initialize connection to RabbitMQ

**`onApplicationBootstrap`**
- Initialize RabbitMQPublisher
- Initialize RabbitPubSubEngine

**`beforeApplicationShutdown`**
- Tear down RabbitMQPublisher
- Tear down RabbitPubSubEngine

**`onApplicationShutdown`**
- Tear down connection to RabbitMQ

## External Systems
In cases where events should be published externally to the application (in the case of analytics for instance), there are two ways to subscribe to the event stream.

### Pre-processing
To subscribe pre-processing, meaning before the core application has processed but after storing the event, first create a queue for the service and bind the queue to the event store exchange.

Related: [Fanout Exchange](https://www.rabbitmq.com/tutorials/tutorial-three-python.html)

### Post-processing
To subscribe post-processing within the core application, simply create a queue and bind it to the pubsub exchange. 


A Moirae publisher leveraging RabbitMQ as a transport layer providing: - RabbitMQConnection: a connection instance for RabbitMQ. Can be resused (e.g. PubSub) - RabbitMQPublisher: Override the default `PUBLISHER` token - RabbitPubSubEngine: Override the de

@moirae/rabbitmq

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@moirae/rabbitmq

@moirae/rabbitmq

Lifecycle

External Systems

Pre-processing

Post-processing

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