Struct AggregateSnapshot 

pub struct AggregateSnapshot<S> { /* private fields */ }

English:
Owned aggregate state paired with the last event revision it represents. No identifier or schema version is added; include validation metadata in S when needed.

日本語:
集約状態と、その状態が反映する最後のイベントのリビジョンを所有します。 識別子やスキーマバージョンは追加しません。検証用メタデータは必要に応じて S に含めます。

Example / 使用例

use ddd_toolkit_core::{AggregateSnapshot, StreamRevision};
let snapshot = AggregateSnapshot::new(42_u64, StreamRevision::new(3));
assert_eq!(*snapshot.state(), 42);
assert_eq!(snapshot.into_parts(), (42, StreamRevision::new(3)));

Implementations

impl<S> AggregateSnapshot<S>

pub fn new(state: S, revision: StreamRevision) -> AggregateSnapshot<S>

English:
Pairs state with revision without checking consistency or compatibility.

日本語:
整合性や互換性を検証せず、state と revision を組み合わせます。

Examples found in repository

examples/event_sourcing.rs (line 158)

    fn load(
        &self,
        id: &u64,
    ) -> Result<Option<AggregateSnapshot<u32>>, SnapshotLoadError<Infallible>> {
        Ok(self
            .0
            .get(id)
            .map(|snapshot| AggregateSnapshot::new(*snapshot.state(), snapshot.revision())))
    }
    fn save(
        &mut self,
        id: &u64,
        snapshot: AggregateSnapshot<u32>,
    ) -> Result<(), SnapshotSaveError<Infallible>> {
        self.0.insert(*id, snapshot);
        Ok(())
    }
}
fn history(store: &MemoryEvents) -> StreamHistory<Added> {
    let LoadResult::Found(history) = store.load(&1).unwrap() else {
        panic!("stream missing");
    };
    history
}
fn main() {
    let mut store = MemoryEvents::default();
    assert!(matches!(store.load(&1).unwrap(), LoadResult::NoStream(_)));
    let first = store
        .append(&1, ExpectedRevision::NoStream(NoStream), vec![Added::V1(2)])
        .unwrap();
    assert_eq!(first.resulting_revision, StreamRevision::new(0));
    let mut replayed = replay_aggregate::<Counter>(&1, &history(&store)).unwrap();
    assert_eq!(replayed.aggregate.value, 2);
    assert!(replayed.aggregate.pull_events().is_empty());
    let mut snapshots = MemorySnapshots::default();
    snapshots
        .save(
            &1,
            AggregateSnapshot::new(replayed.aggregate.value, replayed.revision),
        )
        .unwrap();
    store
        .append(
            &1,
            ExpectedRevision::Revision(replayed.revision),
            vec![Added::V2 { amount: 3 }],
        )
        .unwrap();
    assert!(matches!(
        store.append(
            &1,
            ExpectedRevision::Revision(replayed.revision),
            vec![Added::V1(99)]
        ),
        Err(AppendError::Conflict(_))
    ));
    let history = history(&store);
    let mut restored =
        replay_with_optional_snapshot::<Counter>(&1, &history, snapshots.load(&1).unwrap())
            .unwrap();
    let full = replay_aggregate::<Counter>(&1, &history).unwrap();
    assert_eq!(restored.aggregate.value, 5);
    assert_eq!(restored.aggregate.value, full.aggregate.value);
    assert_eq!(restored.revision, StreamRevision::new(1));
    assert!(restored.aggregate.pull_events().is_empty());
    println!("event_sourcing: upcast v1; rejected stale write; snapshot + tail = 5");
}

pub fn state(&self) -> &S

English:
Borrows the stored aggregate state.

日本語:
保存された集約状態を借用します。

Examples found in repository

examples/event_sourcing.rs (line 158)

    fn load(
        &self,
        id: &u64,
    ) -> Result<Option<AggregateSnapshot<u32>>, SnapshotLoadError<Infallible>> {
        Ok(self
            .0
            .get(id)
            .map(|snapshot| AggregateSnapshot::new(*snapshot.state(), snapshot.revision())))
    }

pub fn revision(&self) -> StreamRevision

English:
Returns the last event revision represented by the state.

日本語:
状態が反映する最後のイベントのリビジョンを返します。

Examples found in repository

examples/event_sourcing.rs (line 158)

    fn load(
        &self,
        id: &u64,
    ) -> Result<Option<AggregateSnapshot<u32>>, SnapshotLoadError<Infallible>> {
        Ok(self
            .0
            .get(id)
            .map(|snapshot| AggregateSnapshot::new(*snapshot.state(), snapshot.revision())))
    }

pub fn into_parts(self) -> (S, StreamRevision)

English:
Consumes the snapshot, returning state and revision without cloning.

日本語:
スナップショットを消費し、複製せずに状態とリビジョンを返します。

Examples found in repository

examples/event_sourcing.rs (line 74)

    fn from_snapshot(id: &u64, snapshot: AggregateSnapshot<u32>) -> Result<Self, Infallible> {
        Ok(Self {
            id: *id,
            value: snapshot.into_parts().0,
            events: vec![],
        })
    }

Trait Implementations

impl<S> Debug for AggregateSnapshot<S>

where S: Debug,

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl<S> Eq for AggregateSnapshot<S>

where S: Eq,

impl<S> PartialEq for AggregateSnapshot<S>

where S: PartialEq,

fn eq(&self, other: &AggregateSnapshot<S>) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl<S> StructuralPartialEq for AggregateSnapshot<S>

where S: PartialEq,