solverforge-solver 0.11.1

Solver engine for SolverForge
Documentation 
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#[test]
fn descriptor_pillar_change_uses_public_pillar_semantics() {
    let descriptor = descriptor();
    let plan = Plan {
        workers: vec![Worker, Worker, Worker],
        tasks: vec![
            Task {
                worker_idx: Some(0),
            },
            Task {
                worker_idx: Some(0),
            },
            Task {
                worker_idx: Some(1),
            },
        ],
        score: None,
    };
    let director = ScoreDirector::simple(plan, descriptor.clone(), |s, _| s.tasks.len());
    let config = MoveSelectorConfig::PillarChangeMoveSelector(PillarChangeMoveConfig {
        minimum_sub_pillar_size: 0,
        maximum_sub_pillar_size: 0,
        value_candidate_limit: None,
        target: VariableTargetConfig::default(),
    });

    let selector = build_descriptor_move_selector::<Plan>(Some(&config), &descriptor, None);
    let moves: Vec<_> = selector.iter_moves(&director).collect();

    assert_eq!(selector.size(&director), 2);
    assert_eq!(moves.len(), 2);
    assert!(moves
        .iter()
        .all(|mov| matches!(mov, super::DescriptorScalarMoveUnion::PillarChange(_))));
}

#[test]
fn descriptor_pillar_change_intersects_entity_domains() {
    let descriptor = restricted_descriptor();
    let plan = RestrictedPlan {
        workers: vec![Worker, Worker, Worker],
        tasks: vec![
            RestrictedTask {
                worker_idx: Some(0),
                allowed_workers: vec![0, 1, 2],
            },
            RestrictedTask {
                worker_idx: Some(0),
                allowed_workers: vec![0, 2],
            },
            RestrictedTask {
                worker_idx: Some(1),
                allowed_workers: vec![0, 1, 2],
            },
        ],
        score: None,
    };
    let mut director = ScoreDirector::simple(plan, descriptor.clone(), |s, _| s.tasks.len());
    let config = MoveSelectorConfig::PillarChangeMoveSelector(PillarChangeMoveConfig {
        minimum_sub_pillar_size: 0,
        maximum_sub_pillar_size: 0,
        value_candidate_limit: None,
        target: VariableTargetConfig::default(),
    });

    let selector =
        build_descriptor_move_selector::<RestrictedPlan>(Some(&config), &descriptor, None);
    let moves: Vec<_> = selector.iter_moves(&director).collect();

    assert_eq!(moves.len(), 1);
    assert!(moves[0].is_doable(&director));
    moves[0].do_move(&mut director);
    assert_eq!(director.working_solution().tasks[0].worker_idx, Some(2));
    assert_eq!(director.working_solution().tasks[1].worker_idx, Some(2));
}

#[test]
fn descriptor_pillar_swap_prunes_illegal_partners() {
    let descriptor = restricted_descriptor();
    let plan = RestrictedPlan {
        workers: vec![Worker, Worker, Worker],
        tasks: vec![
            RestrictedTask {
                worker_idx: Some(0),
                allowed_workers: vec![0, 2],
            },
            RestrictedTask {
                worker_idx: Some(0),
                allowed_workers: vec![0, 2],
            },
            RestrictedTask {
                worker_idx: Some(1),
                allowed_workers: vec![1, 2],
            },
            RestrictedTask {
                worker_idx: Some(1),
                allowed_workers: vec![1, 2],
            },
            RestrictedTask {
                worker_idx: Some(2),
                allowed_workers: vec![0, 1, 2],
            },
            RestrictedTask {
                worker_idx: Some(2),
                allowed_workers: vec![0, 1, 2],
            },
        ],
        score: None,
    };
    let director = ScoreDirector::simple(plan, descriptor.clone(), |s, _| s.tasks.len());
    let config = MoveSelectorConfig::PillarSwapMoveSelector(PillarSwapMoveConfig {
        minimum_sub_pillar_size: 0,
        maximum_sub_pillar_size: 0,
        target: VariableTargetConfig::default(),
    });

    let selector =
        build_descriptor_move_selector::<RestrictedPlan>(Some(&config), &descriptor, None);
    let moves: Vec<_> = selector.iter_moves(&director).collect();

    assert_eq!(moves.len(), 2);
    assert!(moves.iter().all(|mov| mov.is_doable(&director)));
}

#[test]
fn descriptor_pillar_swap_tabu_identity_is_direction_stable() {
    let descriptor = descriptor();
    let plan = Plan {
        workers: vec![Worker, Worker],
        tasks: vec![
            Task {
                worker_idx: Some(0),
            },
            Task {
                worker_idx: Some(0),
            },
            Task {
                worker_idx: Some(1),
            },
            Task {
                worker_idx: Some(1),
            },
        ],
        score: None,
    };
    let mut director = ScoreDirector::simple(plan, descriptor.clone(), |s, _| s.tasks.len());
    let config = MoveSelectorConfig::PillarSwapMoveSelector(PillarSwapMoveConfig {
        minimum_sub_pillar_size: 0,
        maximum_sub_pillar_size: 0,
        target: VariableTargetConfig::default(),
    });
    let selector = build_descriptor_move_selector::<Plan>(Some(&config), &descriptor, None);
    let mut moves: Vec<_> = selector.iter_moves(&director).collect();
    assert_eq!(moves.len(), 1);
    let forward = moves
        .pop()
        .expect("descriptor pillar swap should be generated");
    let forward_signature = forward.tabu_signature(&director);

    forward.do_move(&mut director);

    let reverse_selector = build_descriptor_move_selector::<Plan>(Some(&config), &descriptor, None);
    let mut reverse_moves: Vec<_> = reverse_selector.iter_moves(&director).collect();
    assert_eq!(reverse_moves.len(), 1);
    let reverse = reverse_moves
        .pop()
        .expect("reverse descriptor pillar swap should be generated");
    let reverse_signature = reverse.tabu_signature(&director);

    assert_eq!(forward_signature.move_id, forward_signature.undo_move_id);
    assert_eq!(forward_signature.move_id, reverse_signature.move_id);
}

#[test]
fn descriptor_manual_illegal_pillar_moves_are_not_doable() {
    let descriptor = restricted_descriptor();
    let plan = RestrictedPlan {
        workers: vec![Worker, Worker, Worker],
        tasks: vec![
            RestrictedTask {
                worker_idx: Some(0),
                allowed_workers: vec![0, 2],
            },
            RestrictedTask {
                worker_idx: Some(0),
                allowed_workers: vec![0, 2],
            },
            RestrictedTask {
                worker_idx: Some(1),
                allowed_workers: vec![1, 2],
            },
            RestrictedTask {
                worker_idx: Some(1),
                allowed_workers: vec![1, 2],
            },
        ],
        score: None,
    };
    let director = ScoreDirector::simple(plan, descriptor.clone(), |s, _| s.tasks.len());
    let binding = super::bindings::collect_bindings(&descriptor)
        .into_iter()
        .next()
        .expect("restricted descriptor binding");

    let illegal_change = super::DescriptorPillarChangeMove::new(
        binding.clone(),
        vec![0, 1],
        Some(1),
        descriptor.clone(),
    );
    let illegal_swap =
        super::DescriptorPillarSwapMove::new(binding, vec![0, 1], vec![2, 3], descriptor);

    assert!(!illegal_change.is_doable(&director));
    assert!(!illegal_swap.is_doable(&director));
}