Dendrite

A Rust library to connect to AxonServer.

See the GitHub project rustigaan/archetype-rust-axon for an example of how to use this code.

Core concepts

• Command / Query Responsibility Segregation (CQRS)
• Event Sourcing
• Futures and async/await
• gRPC

More information

• dendrite on crates.io
• dendrite on docs.rs
• dendrite on GitHub

The crate dendrite-macros provides macros that makes working with the dendrite crate more ergonomic.

This project is a sibling of dendrite2go and archetype-go-axon, but for the Rust programming language.

Status

This project has now reached the level of Minimal Viable Deliverable in the sense that the first phase is completed: the current application communicates with AxonServer properly. Like archetype-go-axon it can do the following:

1. ☑ Set up a session with AxonServer
   • ☑ Enable React app to call a RPC endpoint on the example-command-api service through grpc-web
2. ☑ Issue commands
3. ☑ Register a command handler and handle commands
4. ☑ Submit events
   • ☑ Stream events to UI
5. ☑ Retrieve the events for an aggregate and build a projection
   • ☑ Validate commands against the projection
6. ☑ Register a tracking event processor and handle events
7. ☑ Store records in a query model: Elastic Search
   • ☑ Store tracking token in Elastic Search
8. ☑ Register a query handler and handle queries
   • ☑ Show query results in UI

As well as:

• In-memory caching of aggregate projections
• Access to Axon Command-, Event-, QueryRequest-message in body of handlers.

Now it would be nice to:

• Add support for storing snapshots of aggregate projections in AxonServer.
• Add support for segmentation to distribute the load on tracking event processors.
• Add support for sagas.
• ...