Struct AppendCondition 

pub struct AppendCondition {
    pub fail_if_events_match: Query,
    pub after: Position,
}

The guard on an append call.

The store ignores everything at or before after and rejects the append if anything matching fail_if_events_match landed since. after is the highest position the client observed while building its decision model, which may be higher than the last matching event’s position.

Positions are 1-based, so after = Position::ZERO (the default) means “consider the whole log”: the spec’s “omit after” case, i.e. fail if any event matches (the uniqueness-guard pattern).

This type only holds the condition. Evaluating it (position filtering plus the match predicate over the durable suffix) is the engine’s job.

Fields

fail_if_events_match: Query

Reject the append if any event after after matches this query.

after: Position

Ignore everything at or before this position. Position::ZERO means the whole log.

Implementations

impl AppendCondition

pub fn new(fail_if_events_match: Query) -> Self

A condition checking the whole log (after = Position::ZERO): fail if any event matches.

pub fn after(self, after: Position) -> Self

Sets the exclusive lower bound: only events strictly after after are checked.

Trait Implementations

impl Clone for AppendCondition

fn clone(&self) -> AppendCondition

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for AppendCondition

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

Formats the value using the given formatter.

impl Eq for AppendCondition

impl PartialEq for AppendCondition

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for AppendCondition