Struct VirtualRowProviderRegistry 

pub struct VirtualRowProviderRegistry { /* private fields */ }

Process-wide registry of VirtualRowProvider instances, scoped per BufferId (D.4.d.2.1.a).

Each visible buffer that participates in the virtual-rows pipeline owns its own ProviderId → provider sub-map. Scoping by BufferId is what lets baseline + current panes of a side-by-side diff (D.4.d.3) both register filler providers (D.4.c) without colliding on ProviderId, even though the filler ids use side- distinct prefixes — registering against the wrong scope would still mis-route the rows when the worker (post-D.4.d.2.1.b) iterates per-pane.

Mutation (register / unregister) is consumer-creation frequency — never per-frame. Read (snapshot) is per worker tick. Behind a std::sync::Mutex; the hot path holds the lock only long enough to clone out Arc references.

Implementations

impl VirtualRowProviderRegistry

pub fn new() -> Self

pub fn register( &self, buffer_id: BufferId, provider: Arc<dyn VirtualRowProvider>, ) -> bool

Register a provider against buffer_id. Returns false if a provider with the same id was already registered in the same buffer scope (no replacement — the caller is expected to unregister first). Providers with the same id in different buffer scopes do not collide.

pub fn unregister(&self, buffer_id: BufferId, id: ProviderId) -> bool

Remove a provider from buffer_id’s scope. Returns true if one was removed. Empty scopes are pruned so is_empty() reflects “no providers anywhere”.

pub fn snapshot(&self, buffer_id: BufferId) -> Vec<Arc<dyn VirtualRowProvider>>

Snapshot providers registered against buffer_id. Returns fresh Arc clones — callers can hold them past a concurrent unregister (RCU). Order is unspecified. Returns an empty Vec if the buffer has no scope.

pub fn is_empty(&self) -> bool

True iff no buffer scope holds any provider.

pub fn len(&self) -> usize

Total provider count across all buffer scopes.

Trait Implementations

impl Debug for VirtualRowProviderRegistry

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for VirtualRowProviderRegistry

fn default() -> VirtualRowProviderRegistry

Returns the “default value” for a type.

impl VirtualRowRegistrar for VirtualRowProviderRegistry

AUX‑2: bridge so subsystems without access to VirtualRowProviderRegistry can register headerlines.

fn register( &self, buffer: BufferId, provider: Arc<dyn VirtualRowProvider>, ) -> bool

Register provider against buffer. Returns false if a provider with the same ProviderId is already registered in the same buffer scope.

fn unregister(&self, buffer: BufferId, id: ProviderId) -> bool

Remove the provider identified by id from buffer’s scope.