Low latency batching tool. Bundle lots of single concurrent operations into sequential batches of work.
```rust use benjamin_batchly::{BatchMutex, BatchResult};
let batcher = BatchMutex::default();
// BatchMutex synchronizes so only one Work happens at a time (for a given batchkey).
// All concurrent submissions made while an existing Work is being processed will
// await completion and form the next Work batch.
match batcher.submit(batchkey, item).await {
BatchResult::Work(mut batch) => {
dbbulkinsert(&batch.items).await?;
batch.notifyalldone();
Ok(())
}
BatchResult::Done(_) => Ok(()),
BatchResult::Failed => Err("failed"),
}
```