Method reinsert_change

atomic-core/src/pristine/txn/write/mod.rs:682–791

(
        &mut self,
        view: &mut ViewState,
        change_id: NodeId,
        change_hash: &Hash,
        at_sequence: u64,
    )

    }

    fn reinsert_change(
        &mut self,
        view: &mut ViewState,
        change_id: NodeId,
        change_hash: &Hash,
        at_sequence: u64,
    ) -> PristineResult<()> {
        // Clamp sequence to valid range
        let insert_at = at_sequence.min(view.change_count);

        // Shift all changes from insert_at onwards up by 1
        // Work backwards to avoid overwriting
        for s in (insert_at..view.change_count).rev() {
            // Get the change_id at this sequence
            let cid = {
                let table = self.txn.open_table(VIEW_CHANGES)?;
                let key = encode_view_seq(view.id, s);
                let result = table.get(&key)?;
                match result {
                    Some(v) => {
                        let id = NodeId::new(v.value());
                        drop(v);
                        id
                    }
                    None => continue,
                }
            };

            // Remove old entry
            {
                let mut table = self.txn.open_table(VIEW_CHANGES)?;
                let key = encode_view_seq(view.id, s);
                table.remove(&key)?;
            }

            // Insert at new sequence (s + 1)
            {
                let mut table = self.txn.open_table(VIEW_CHANGES)?;
                let key = encode_view_seq(view.id, s + 1);
                table.insert(&key, cid.get())?;
            }

            // Update reverse mapping
            {
                let mut table = self.txn.open_table(REV_VIEW_CHANGES)?;
                let key = encode_view_seq(view.id, cid.get());
                table.insert(&key, s + 1)?;
            }
        }

        // Insert the new change at the specified position
        {
            let mut table = self.txn.open_table(VIEW_CHANGES)?;
            let key = encode_view_seq(view.id, insert_at);
            table.insert(&key, change_id.get())?;
        }

        // Add reverse mapping