Enum ReadAtCapability 

pub enum ReadAtCapability {
    Available {
        readable_from_epoch: u64,
        readable_through_epoch: u64,
    },
    Unavailable {
        reason: String,
    },
}

Backend evidence required before remote strong/stale reads may be enabled.

Variants

Available

The backend retains every epoch in this inclusive readable interval and can bind a read-only session to the complete supplied fence.

Fields

readable_from_epoch: u64

Oldest retained data epoch.

readable_through_epoch: u64

Newest data epoch proven readable.

Unavailable

The backend must not be selected for remote strong/stale reads.

Fields

reason: String

Stable operator-visible reason.

Implementations

impl ReadAtCapability

pub fn unavailable(reason: impl Into<String>) -> Self

Creates an explicit unavailable capability result.

pub fn validate(&self, point: &ReadAtPoint) -> ReadAtResult<()>

Checks whether point is inside the proven retained interval.

pub fn unavailable_error( &self, point: &ReadAtPoint, fallback_reason: &str, ) -> ReadAtError

Produces an unavailable result while retaining the requested epoch.

Trait Implementations

impl Clone for ReadAtCapability

fn clone(&self) -> ReadAtCapability

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ReadAtCapability

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for ReadAtCapability

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Eq for ReadAtCapability

impl PartialEq for ReadAtCapability

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

Equality operator ==.

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

Inequality operator !=.

impl Serialize for ReadAtCapability

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for ReadAtCapability