Module arc_batch 

An Arc-backed batch newtype whose contents can be shared across timely runtimes.

Differential’s default spines reference-count their batches with Rc, which is worker-local. Sharing an arrangement with another runtime (a reader on a different worker thread) needs the batches behind an Arc so a batch whose contents are Send + Sync can be read from that other thread.

The blanket impl Trait for Arc<B> that would express this lives outside this crate: both Arc and differential’s Batch/Builder/Merger/Cursor traits are foreign, so the orphan rule forbids it here. ArcBatch is a local newtype around Arc<B> that carries those impls instead. The impls delegate straight through to the inner batch, so ArcBatch<B> behaves exactly like B except that its handle is atomically reference counted.

This mirrors differential’s own rc_blanket_impls (for Rc<B>), swapping in Arc. Keeping it here as a newtype lets cross-thread arrangement sharing build against a released differential-dataflow, with no differential-side Arc batch impls required.

Structs

ArcBatch

An Arc-backed batch, shareable across threads when B’s contents are Send + Sync.

ArcBatchCursor

Cursor over an ArcBatch, delegating to the inner batch’s cursor.

ArcBuilder

Builds ArcBatches, delegating to the inner batch’s builder.

ArcMerger

Merges ArcBatches, delegating to the inner batch’s merger.