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eventide-domain

中文版本: README.zh.md

Domain layer of the eventide DDD/CQRS toolkit. This crate ships the pure-Rust building blocks that your business logic actually depends on — and only those. It has no database driver, no message broker, and no HTTP framework.

What is in here

Module	Highlights
`aggregate`	`Aggregate` trait (`TYPE`, `Command`, `Event`, `Error`, `execute`, `apply`).
`aggregate_root`	`AggregateRoot<A, R>` orchestrating load → execute → apply → save.
`entity`	`Entity` trait with `id` / `version` for optimistic concurrency.
`value_object`	`ValueObject` marker trait and `Version` newtype.
`domain_event`	`DomainEvent` trait, `EventEnvelope`, `EventContext`, `Metadata`, `FieldChanged`.
`event_upcaster`	`EventUpcaster` + `EventUpcasterChain` for evolving event schemas.
`persist`	`EventRepository`, `SnapshotRepository`, `AggregateRepository` and reusable adapters.
`eventing`	Optional async event subsystem (bus / engine / dispatcher / reclaimer) on `tokio`.
`specification`	`Specification<T>` combinator pattern (`and`, `or`, `not`).
`error`	`DomainError`, `ErrorKind`, `ErrorCode` for typed domain failures.

Add it

[dependencies]
eventide-domain = "0.1"

The macro-generated Serialize / Deserialize derives route through this crate's internal serde re-export, so #[entity], #[entity_id], #[domain_event] and #[value_object] work without a direct serde dependency. The crate also re-exports eventide_domain::async_trait (write #[async_trait] on your own trait impls) and eventide_domain::tokio (runtime, gated on the eventing feature). Add serde / tokio / async-trait to your own Cargo.toml only when you reach for them outside these re-exports (extra derives, custom #[serde(...)] attributes, advanced runtime features).

Or pull everything in via the umbrella crate:

[dependencies]
eventide = "0.1"

Feature flags

Flag	Default	What it enables
`eventing`	yes	Asynchronous event subsystem (bus / engine / dispatcher / reclaimer). Pulls in `tokio` and `futures-util`.
`infra-sqlx`	no	`sqlx` conversions on `SerializedEvent` / `SerializedSnapshot` for Postgres-backed event stores.

Disable eventing when you only need pure aggregate modelling:

[dependencies]
eventide-domain = { version = "0.1", default-features = false }

Macros

The companion crate eventide-macros generates the boilerplate (Entity, DomainEvent, etc.). The generated code uses absolute paths ::eventide_domain::..., and this crate exposes a self-alias so the macros also resolve inside its own tests:

// src/lib.rs
extern crate self as eventide_domain;

Repository helpers

use std::sync::Arc;
use eventide_domain::event_upcaster::EventUpcasterChain;
use eventide_domain::persist::{
    EventSourcedRepo, SnapshotPolicy, SnapshotPolicyRepo, SnapshotRepositoryWithPolicy,
};

let upcasters = Arc::new(EventUpcasterChain::default());
let event_repo = Arc::new(MyEventRepo::new());
let snapshot_repo = Arc::new(SnapshotRepositoryWithPolicy::new(
    MySnapshotRepo::new(),
    SnapshotPolicy::Every(100),
));

// Pure event sourcing.
let es = EventSourcedRepo::new(event_repo.clone(), upcasters.clone());

// Event sourcing + snapshots.
let snap = SnapshotPolicyRepo::new(event_repo.clone(), snapshot_repo, upcasters);

Examples

cargo run -p eventide-domain --example event_upcasting       # upcaster chain + repos
cargo run -p eventide-domain --example event_repository      # custom EventRepository
cargo run -p eventide-domain --example snapshot_repository   # snapshot policies
cargo run -p eventide-domain --example eventing_inmemory     # async event engine
cargo run -p eventide-domain --example account_aggregate     # full aggregate flow

Layered architecture

eventide-domain is the centre of the dependency graph:

eventide-application  →  eventide-domain  ←  eventide-macros
                                 ↑
                                 └──── (optional) infra-sqlx

The domain crate intentionally never imports application or infrastructure types, which keeps your business logic pure and trivially testable.

License

Licensed under either of Apache-2.0 or MIT at your option.

eventide-domain 0.1.1