Building the application

For a bare minimum operating application we are missing a number of components including:

• a Restful API or other interface
• non-volatile persistence
• useful queries

A demo application with examples of all of these features is available in the cqrs-demo project.

The persist module contains the generic entities needed for a backing event store. A database repository handles the implementation specifics with three options currently available:

• PostgreSQL - postgres-es
• MySQL - mysql-es
• DynamoDb - dynamo-es

These libraries also provide persistence for simple queries. Note that postgres-es is used for examples in this user guide but all the crates have similar methods available.

For using postgres-es for persistence, add to the dependencies section of your Cargo.toml:

[dependencies]
cqrs-es = "0.3.0"
postgres-es = "0.3.0"