event-store-adapter-rs

This library is designed to turn DynamoDB into an Event Store for Event Sourcing.

日本語

Usage

You can easily implement an Event Sourcing-enabled repository using EventStore.

```rust pub struct UserAccountRepository { event_store: EventStore, }

impl UserAccountRepository { pub fn new(eventstore: EventStore) -> Self { Self { eventstore } }

pub async fn store( &mut self, event: &UserAccountEvent, version: usize, snapshotopt: Option<&UserAccount>, ) -> Result<()> { self .eventstore .storeeventandsnapshotopt(event, version, snapshot_opt) .await }

pub async fn findbyid(&self, id: &UserAccountId) -> Result { let (snapshot, seqnr, version) = self.eventstore.getlatestsnapshotbyid(id).await?; let events = self.eventstore.geteventsbyidsinceseqnr(id, seqnr).await?; let result = UserAccount::replay(events, Some(snapshot), version); Ok(result) } } ```

The following is an example of the repository usage

```rust let eventstore = EventStore::new( awsdynamodbclient.clone(), journaltablename.tostring(), journalaidindexname.tostring(), snapshottablename.tostring(), snapshotaidindexname.to_string(), 64, );

let mut repository = UserAccountRepository::new(event_store);

// Replay the aggregate from the event store let mut useraccount = repository.findbyid(useraccount_id).await.unwrap();

// Execute a command on the aggregate let useraccountevent = user_account.rename(name).unwrap();

// Store the new event without a snapshot repository .store(&useraccountevent, useraccount.version(), None) .await // Store the new event with a snapshot // repository // .store(&useraccountevent, useraccount.version(), Some(&user_account)) // .await ```

Table Specifications

See docs/DATABASE_SCHEMA.md.