Enum SyncGuarantee 

pub enum SyncGuarantee {
    None,
    Ordered,
    Durable,
}

How strong a backend’s Storage::sync actually is — the standing answer to a Durability request, declared once in Capabilities rather than discovered per call.

Deliberately three-valued rather than the “can this backend flush?” boolean it replaces, because that question has a common and useful middle answer it could not express: a backend that orders writes against each other without paying for a device-wide cache drain. Offered only true and false, such a backend has to either overstate — claiming a durability it does not deliver — or understate, claiming it cannot flush at all when ordering is precisely what Storage::write_atomic asks it for.

Variants

None

sync does nothing: an in-memory store, or a port with no flush primitive under it to call.

Ordered

sync orders writes against each other, but does not promise any of them outlives a power cut.

Durable

sync flushes through to durable storage.

Implementations

impl SyncGuarantee

pub const fn satisfies(self, need: Durability) -> bool

Whether a backend making this guarantee can honor need.

Trait Implementations

impl Clone for SyncGuarantee

fn clone(&self) -> SyncGuarantee

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for SyncGuarantee

impl Debug for SyncGuarantee

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

Formats the value using the given formatter.

impl Eq for SyncGuarantee

impl Ord for SyncGuarantee

fn cmp(&self, other: &SyncGuarantee) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for SyncGuarantee

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

Equality operator ==.

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

Inequality operator !=.

impl PartialOrd for SyncGuarantee

fn partial_cmp(&self, other: &SyncGuarantee) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl StructuralPartialEq for SyncGuarantee