RisingStack / Cqrs Example
CQRS: Command Query Responsibility Segregation - Node.js at Scale
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cqrs-example
CQRS with Denormalizer example repo for the Node.js at Scale blog series
Requirements
- Node.js
- RabbitMQ:
brew install rabbitmq
Usage
npm start
In this example you can see how an imaginary user service emits change events. A denormalizer listens for these change events and stores a subset of the user (name only) in a Reporting Database for further client queries.
Because of eventually consistency the Reporting Database is may out of sync.
Inputs
Create user: { name: 'John Doe', state: 'default' }
Update user's state: { state: 'churn' }
Rename user: { name: 'John Smith' }
Output
Running...
User in user service database { id: 'aaa', name: 'John Smith', state: 'churn' }
User in Reporting Database { name: 'John Smith' }
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