Enum Phase 

#[repr(u8)]
pub enum Phase {
    Starting = 0,
    Ready = 1,
    Draining = 2,
    ShuttingDown = 3,
    Stopped = 4,
}

Discrete lifecycle phases. Numeric values are monotonic so an AtomicU8 compare_exchange gives us atomic transitions without a mutex. Decoded via Phase::from_u8.

Variants

Starting = 0

Engine is opening: WAL replay, restore-from-remote, initial checkpoint. Reads and writes are not yet served.

Ready = 1

Engine is fully ready: every public surface accepts traffic.

Draining = 2

/admin/drain was called or /admin/shutdown is in flight. New writes return 503; existing in-flight may finish.

ShuttingDown = 3

Engine::graceful_shutdown is running its final flush + checkpoint + optional backup. The runtime is no longer usable for writes.

Stopped = 4

Shutdown completed; the process is safe to exit.

Implementations

impl Phase

pub fn from_u8(v: u8) -> Self

pub fn as_str(self) -> &'static str

pub fn accepts_writes(self) -> bool

Whether public mutations should be allowed in this phase. Replica/read_only checks live in WriteGate; this is the orthogonal lifecycle check.

pub fn accepts_queries(self) -> bool

Whether the runtime is far enough along in boot to answer SQL queries. /health/ready follows this answer.

Trait Implementations

impl Clone for Phase

fn clone(&self) -> Phase

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Phase

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

Formats the value using the given formatter.

impl Ord for Phase

fn cmp(&self, other: &Phase) -> 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 Phase

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

Tests for self and other values to be equal, and is used by ==.

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

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

impl PartialOrd for Phase

fn partial_cmp(&self, other: &Phase) -> 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 Copy for Phase

impl Eq for Phase

impl StructuralPartialEq for Phase