Struct DepthFirstScheduler 

pub struct DepthFirstScheduler { /* private fields */ }

An implementation of ExerciseScheduler based on depth-first search.

Implementations

impl DepthFirstScheduler

pub fn new(data: SchedulerData) -> Self

Creates a new scheduler.

pub fn get_course_valid_starting_lessons( &self, course_id: Ustr, metadata_filter: Option<&KeyValueFilter>, ) -> Result<Vec<Ustr>>

Returns the lessons in the course that have no dependencies with other lessons in the course and whose dependencies are satisfied.

Trait Implementations

impl ExerciseScheduler for DepthFirstScheduler

fn get_exercise_batch( &self, filter: Option<ExerciseFilter>, ) -> Result<Vec<ExerciseManifest>, ExerciseSchedulerError>

Gets a new batch of exercises scheduled for a new trial. Contains an optimal filter to restrict the units visited during the search with the purpose of allowing students to choose which material to practice. If the filter is not provided, the scheduler will search the entire graph.

fn score_exercise( &self, exercise_id: Ustr, score: MasteryScore, timestamp: i64, ) -> Result<(), ExerciseSchedulerError>

Records the score of the given exercise’s trial. The scores are used by the scheduler to decide when to stop traversing a path and how to sort and filter all the found candidates into a final batch.

fn get_unit_score( &self, unit_id: Ustr, ) -> Result<Option<f32>, ExerciseSchedulerError>

Gets the score for the given unit. The unit can be a course, lesson, or exercise.

fn invalidate_cached_score(&self, unit_id: Ustr)

Removes any cached scores for the given unit. The score will be recomputed the next time the score is needed.

fn invalidate_cached_scores_with_prefix(&self, prefix: &str)

Removes any cached scores from units with the given prefix. The same considerations as invalidate_cached_score apply.

fn get_scheduler_options(&self) -> SchedulerOptions

Returns the options used to control the behavior of the scheduler.

fn set_scheduler_options(&mut self, options: SchedulerOptions)

Sets the options used to control the behavior of the scheduler.

fn reset_scheduler_options(&mut self)

Resets the options used to control the behavior of the scheduler to their default values.