Struct EvaluationContext 

pub struct EvaluationContext<UserData> { /* private fields */ }

Immutable input data for specifications that need counters, flags, time, and application-specific user data.

The context has no interior mutability or global registration mechanism. It is Send and Sync when UserData and its standard-library fields are, allowing callers to move or share a context according to the auto-trait rules of the user data they provide.

Implementations

impl<UserData> EvaluationContext<UserData>

pub fn new(user_data: UserData) -> Self

Creates an empty context containing typed user_data.

pub fn with_counter(self, key: impl Into<String>, value: u64) -> Self

Adds or replaces a counter while constructing the context.

pub fn with_flag(self, key: impl Into<String>, value: bool) -> Self

Adds or replaces a flag while constructing the context.

pub fn with_timestamp(self, key: impl Into<String>, value: Duration) -> Self

Adds or replaces a timestamp while constructing the context.

pub fn user_data(&self) -> &UserData

Returns the typed application data.

pub fn counter(&self, key: &str) -> u64

Returns a counter, treating a missing key as zero.

pub fn flag(&self, key: &str) -> bool

Returns a flag, treating a missing key as false.

pub fn timestamp(&self, key: &str) -> Option<Duration>

Returns the timestamp stored for key, if one exists.

Trait Implementations

impl<UserData> Specification<EvaluationContext<UserData>> for MaxCount

fn is_satisfied_by(&self, context: &EvaluationContext<UserData>) -> bool

Returns whether candidate satisfies this rule.

fn and<Other>(self, other: Other) -> And<Self, Other>

where Self: Sized, Other: Specification<T>,

Combines this rule with other using short-circuiting logical AND.

fn or<Other>(self, other: Other) -> Or<Self, Other>

where Self: Sized, Other: Specification<T>,

Combines this rule with other using short-circuiting logical OR.

fn not(self) -> Not<Self>

where Self: Sized,

Creates a rule that negates this rule’s result.

impl<UserData> Specification<EvaluationContext<UserData>> for Flag

fn is_satisfied_by(&self, context: &EvaluationContext<UserData>) -> bool

Returns whether candidate satisfies this rule.

fn and<Other>(self, other: Other) -> And<Self, Other>

where Self: Sized, Other: Specification<T>,

Combines this rule with other using short-circuiting logical AND.

fn or<Other>(self, other: Other) -> Or<Self, Other>

where Self: Sized, Other: Specification<T>,

Combines this rule with other using short-circuiting logical OR.

fn not(self) -> Not<Self>

where Self: Sized,

Creates a rule that negates this rule’s result.

impl<UserData, ClockType> Specification<EvaluationContext<UserData>> for Cooldown<ClockType>

where ClockType: Clock,

fn is_satisfied_by(&self, context: &EvaluationContext<UserData>) -> bool

Returns whether candidate satisfies this rule.

fn and<Other>(self, other: Other) -> And<Self, Other>

where Self: Sized, Other: Specification<T>,

Combines this rule with other using short-circuiting logical AND.

fn or<Other>(self, other: Other) -> Or<Self, Other>

where Self: Sized, Other: Specification<T>,

Combines this rule with other using short-circuiting logical OR.

fn not(self) -> Not<Self>

where Self: Sized,

Creates a rule that negates this rule’s result.