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bevy/release-content/migration-guides/schedule_cleanup.md
Christian Hughes 2be3bc5310
Improve node encapsulation in ScheduleGraph (#20119) 
# Objective

- Part of #20115

We want to encapsulate each part of `ScheduleGraph` into its own
specific struct to make parts of it easier to reuse and maintain.

## Solution

- Pulled `ScheduleGraph::systems` and `ScheduleGraph::system_conditions`
into a `Systems` struct and added a field for this new struct to
`ScheduleGraph`
- Broke up `ScheduleGraph::uninit` into `Systems::uninit` and
`SystemSets::uninit` to eliminate `ScheduleGraph`'s direct field access
of these types
- Removed node and condition accessors from `ScheduleGraph`; the same
operations are now available on `Systems` and `SystemSets` instead
(accessible via their `pub` fields on `ScheduleGraph`)
- Moved `Systems`, `SystemSets`, `SystemNode`, `SystemWithAccess`, and
`ConditionWithAccess` into a separate file.

## Testing

Added two new tests covering the API surface of `Systems` and
`SystemSets`, respectively.

---------

Co-authored-by: Chris Russell <8494645+chescock@users.noreply.github.com>
2025-07-15 06:29:52 +00:00

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title pull_requests
Schedule API Cleanup
19352
20119

In order to support removing systems from schedules, Vecs storing Systems and SystemSets have been replaced with SlotMaps which allow safely removing nodes and reusing indices. The maps are respectively keyed by SystemKeys and SystemSetKeys.

The following signatures were changed:

  • NodeId::System: Now stores a SystemKey instead of a plain usize
  • NodeId::Set: Now stores a SystemSetKey instead of a plain usize
  • ScheduleBuildPass::collapse_set: Now takes the type-specific keys. Wrap them back into a NodeId if necessary.
  • The following functions now return the type-specific keys. Wrap them back into a NodeId if necessary.
    • Schedule::systems
    • ScheduleGraph::conflicting_systems

The following functions were replaced. Those that took or returned NodeId now take or return SystemKey or SystemSetKey. Wrap/unwrap them as necessary.

  • ScheduleGraph::contains_set: Use ScheduleGraph::system_sets and SystemSets::contains.
  • ScheduleGraph::get_set_at: Use ScheduleGraph::system_sets and SystemSets::get.
  • ScheduleGraph::set_at: Use ScheduleGraph::system_sets and SystemSets::index (system_sets[key]).
  • ScheduleGraph::get_set_conditions_at: Use ScheduleGraph::system_sets and SystemSets::get_conditions.
  • ScheduleGraph::system_sets: Use ScheduleGraph::system_sets and SystemSets::iter.
  • ScheduleGraph::get_system_at: Use ScheduleGraph::systems and Systems::get.
  • ScheduleGraph::system_at: Use ScheduleGraph::systems and Systems::index (systems[key]).
  • ScheduleGraph::systems: Use ScheduleGraph::systems and Systems::iter.

The following functions were removed:

  • NodeId::index: You should match on and use the SystemKey and SystemSetKey instead.
  • NodeId::cmp: Use the PartialOrd and Ord traits instead.
  • ScheduleGraph::set_conditions_at: If needing to check presence of conditions, use ScheduleGraph::system_sets and SystemSets::has_conditions. Otherwise, use SystemSets::get_conditions.