Enum CheckpointRecordLifecycle 

pub enum CheckpointRecordLifecycle {
    Active {},
    Released {
        released_at_ms: u64,
    },
}

Lifecycle of a durable checkpoint record: monotonic, with exactly two states and one transition.

A record is born active under a freshly generated id and pins its basis until something moves it to released by compare-and-swap — the owner asking for it, or garbage collection observing that its expires_at_ms passed. released is terminal: nothing returns a record to active, so a released record protects nothing and answers no read. Garbage collection deletes it once released_at_ms is a grace window old. A new pin is a new record under a new id, never a revival of this one.

Variants

Active

Protects the checkpoint basis. The sole state a read may serve from.

The braces make serde reject a stray released_at_ms; a unit variant would silently accept and discard that field.

Released

Terminal: the pin is gone and the record is waiting to be deleted.

Fields

released_at_ms: u64

Unix-millisecond stamp written by the release compare-and-swap, and the only input to when the record may be deleted.

Trait Implementations

impl Clone for CheckpointRecordLifecycle

fn clone(&self) -> CheckpointRecordLifecycle

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for CheckpointRecordLifecycle

impl Debug for CheckpointRecordLifecycle

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for CheckpointRecordLifecycle

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Display for CheckpointRecordLifecycle

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

Formats the value using the given formatter.

impl Eq for CheckpointRecordLifecycle

impl PartialEq for CheckpointRecordLifecycle

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

Equality operator ==.

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

Inequality operator !=.

impl Serialize for CheckpointRecordLifecycle

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 CheckpointRecordLifecycle