Struct FoldOutcome 

pub struct FoldOutcome<S> {
    pub state: S,
    pub entries_processed: usize,
    pub started_at: DateTime<Utc>,
    pub completed_at: DateTime<Utc>,
    pub context: FoldContext,
    pub metadata: Value,
}

Outcome of a fold operation.

Contains the derived state along with metadata about the fold execution.

Fields

state: S

The derived state

entries_processed: usize

Number of entries processed

started_at: DateTime<Utc>

When the fold started

completed_at: DateTime<Utc>

When the fold completed

context: FoldContext

Context used for the fold

metadata: Value

Optional metadata

Implementations

impl<S> FoldOutcome<S>

pub fn new(state: S, entries_processed: usize, context: FoldContext) -> Self

Create a new fold result with identical start and completion timestamps.

pub fn with_timing( state: S, entries_processed: usize, context: FoldContext, started_at: DateTime<Utc>, ) -> Self

Create with timing information.

pub fn with_elapsed( state: S, entries_processed: usize, context: FoldContext, started_at: DateTime<Utc>, elapsed: Duration, ) -> Self

Create with timing information derived from a monotonic elapsed duration.

Avoids a second Utc::now() call by computing completed_at from started_at + elapsed.

pub fn with_metadata(self, metadata: Value) -> Self

Set metadata.

pub fn duration(&self) -> Duration

Get duration of the fold.

pub fn map<T, F: FnOnce(S) -> T>(self, f: F) -> FoldOutcome<T>

Map the state to a different type.

Trait Implementations

impl<S: Clone> Clone for FoldOutcome<S>

fn clone(&self) -> FoldOutcome<S>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<S: Debug> Debug for FoldOutcome<S>

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

Formats the value using the given formatter.

impl<S: Default> Default for FoldOutcome<S>

fn default() -> Self

Returns the “default value” for a type.

impl<'de, S> Deserialize<'de> for FoldOutcome<S>

where S: Deserialize<'de>,

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl<S> Serialize for FoldOutcome<S>

where S: Serialize,

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

where __S: Serializer,

Serialize this value into the given Serde serializer.