Enum eventstore::ExpectedRevision

pub enum ExpectedRevision {
    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 ExpectedRevision except ExpectedRevision::Any. When using ExpectedRevision::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 ExpectedRevision

fn clone(&self) -> ExpectedRevision

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for ExpectedRevision

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

Formats the value using the given formatter.

impl Display for ExpectedRevision

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

Formats the value using the given formatter.

impl PartialEq for ExpectedRevision

fn eq(&self, other: &ExpectedRevision) -> bool

This method tests for self and other values to be equal, and is used by ==.

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

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for ExpectedRevision

impl Eq for ExpectedRevision

impl StructuralPartialEq for ExpectedRevision