Struct EpochPhaseState 

pub struct EpochPhaseState {
    pub epoch: u64,
    pub phase: Phase,
}

CRDT state combining an epoch counter with a lifecycle phase.

The epoch increases on reopen operations, ensuring that reopens always win against concurrent operations in earlier epochs.

Fields

epoch: u64

Monotonically increasing epoch counter. Incremented on reopen.

phase: Phase

Current lifecycle phase within this epoch.

Implementations

impl EpochPhaseState

pub const fn new() -> Self

Create a new state at epoch 0, phase Open.

pub const fn with(epoch: u64, phase: Phase) -> Self

Create a state with specific epoch and phase.

pub fn advance(&mut self, target: Phase) -> Result<(), StateError>

Advance to a new phase within the current epoch.

Returns Err if the target phase has a lower rank than the current phase (within the same epoch, phases only move forward).

Errors

Returns StateError::InvalidTransition if the target phase has a rank equal to or lower than the current phase.

pub const fn reopen(&mut self)

Reopen the item: increment epoch and set phase to Open.

This is valid from any phase. The epoch increment ensures this reopen wins against concurrent operations in the old epoch.

pub fn merge(&mut self, other: &Self)

Merge two states, producing the semilattice join (least upper bound).

Rules:

1. Higher epoch wins entirely.
2. Same epoch: higher phase rank wins.

Trait Implementations

impl Clone for EpochPhaseState

fn clone(&self) -> EpochPhaseState

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for EpochPhaseState

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

Formats the value using the given formatter.

impl Default for EpochPhaseState

fn default() -> Self

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for EpochPhaseState

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Display for EpochPhaseState

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

Formats the value using the given formatter.

impl Hash for EpochPhaseState

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for EpochPhaseState

fn eq(&self, other: &EpochPhaseState) -> 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 Serialize for EpochPhaseState

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

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl Eq for EpochPhaseState

impl StructuralPartialEq for EpochPhaseState