Enum eventstore::ExpectedVersion

pub enum ExpectedVersion {
    Any,
    StreamExists,
    NoStream,
    Exact(u64),
}

Constants used for expected version control. The use of expected version can be a bit tricky especially when discussing assurances given by the GetEventStore server.

The GetEventStore server will assure idempotency for all operations using any value in ExpectedVersion except ExpectedVersion::Any. When using ExpectedVersion::Any, the GetEventStore server will do its best to assure idempotency but will not guarantee idempotency.

Variants

Any

This write should not conflict with anything and should always succeed.

StreamExists

The stream should exist. If it or a metadata stream does not exist, treats that as a concurrency problem.

NoStream

The stream being written to should not yet exist. If it does exist, treats that as a concurrency problem.

Exact(u64)

States that the last event written to the stream should have an event number matching your expected value.

Trait Implementations

impl Clone for ExpectedVersion

pub fn clone(&self) -> ExpectedVersion

Returns a copy of the value.

pub fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for ExpectedVersion

impl Debug for ExpectedVersion

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

Formats the value using the given formatter.