Enum Stage

#[non_exhaustive]
pub enum Stage {
    Off,
    DualWrite,
    Shadow,
    Live,
    Rampdown,
    Complete,
}

Stage denotes one of six possible stages a technology migration could be a part of, progressing through the following order.

Off -> DualWrite -> Shadow -> Live -> RampDown -> Complete

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

Off

Off - migration hasn’t started, “old” is authoritative for reads and writes

DualWrite

DualWrite - write to both “old” and “new”, “old” is authoritative for reads

Shadow

Shadow - both “new” and “old” versions run with a preference for “old”

Live

Live - both “new” and “old” versions run with a preference for “new”

Rampdown

RampDown - only read from “new”, write to “old” and “new”

Complete

Complete - migration is done

Trait Implementations

impl Clone for Stage

fn clone(&self) -> Stage

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Stage

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for Stage

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Display for Stage

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

Formats the value using the given formatter.

impl From<Stage> for FlagValue

fn from(stage: Stage) -> FlagValue

Converts to this type from the input type.

impl PartialEq for Stage

fn eq(&self, other: &Stage) -> 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 Stage

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

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl TryFrom<FlagValue> for Stage

type Error = String

The type returned in the event of a conversion error.

fn try_from(value: FlagValue) -> Result<Self, Self::Error>

Performs the conversion.

impl Copy for Stage

impl Eq for Stage

impl StructuralPartialEq for Stage