Trait GaObserver

Source

pub trait GaObserver<U: ChromosomeT>: Send + Sync {
    // Provided methods
    fn on_run_start(&self) { ... }
    fn on_generation_start(&self, _generation: usize) { ... }
    fn on_selection_complete(
        &self,
        _generation: usize,
        _duration: Duration,
        _population_size: usize,
    ) { ... }
    fn on_crossover_complete(
        &self,
        _generation: usize,
        _duration: Duration,
        _offspring_count: usize,
    ) { ... }
    fn on_mutation_complete(
        &self,
        _generation: usize,
        _duration: Duration,
        _population_size: usize,
    ) { ... }
    fn on_fitness_evaluation_complete(
        &self,
        _generation: usize,
        _duration: Duration,
        _population_size: usize,
    ) { ... }
    fn on_survivor_selection_complete(
        &self,
        _generation: usize,
        _duration: Duration,
        _population_size: usize,
    ) { ... }
    fn on_new_best(&self, _generation: usize, _best: U) { ... }
    fn on_stagnation(&self, _generation: usize, _stagnation_count: usize) { ... }
    fn on_extension_triggered(&self, _event: ExtensionEvent) { ... }
    fn on_generation_end(&self, _stats: &GenerationStats) { ... }
    fn on_run_end(
        &self,
        _cause: TerminationCause,
        _all_stats: &[GenerationStats],
    ) { ... }
}

Expand description

Structured lifecycle observer for Ga<U>.

All methods have default no-op implementations — implement only the hooks you need. The Send + Sync supertraits are required for safe sharing across rayon threads (island model) via Arc.

§Differences from `Reporter`

Aspect	Reporter	GaObserver
Storage	`Box<dyn Reporter + Send>`	`Arc<dyn GaObserver + Send + Sync>`
Mutability	`&mut self`	`&self`
Hooks	4 lifecycle	12 (lifecycle + operator + special)
Thread safety	`Send` only	`Send + Sync`