fn try_expand()

in src/storage/seg/src/ttl_buckets/ttl_bucket.rs [146:172]

• 26 lines of code
• 4 McCabe index (conditional complexity)

    fn try_expand(&mut self, segments: &mut Segments) -> Result<(), TtlBucketsError> {
        if let Some(id) = segments.pop_free() {
            {
                if let Some(tail_id) = self.tail {
                    let mut tail = segments.get_mut(tail_id).unwrap();
                    tail.set_next_seg(Some(id));
                }
            }

            let mut segment = segments.get_mut(id).unwrap();
            segment.set_prev_seg(self.tail);
            segment.set_next_seg(None);
            segment.set_ttl(Duration::from_secs(self.ttl as u32));
            if self.head.is_none() {
                debug_assert!(self.tail.is_none());
                self.head = Some(id);
            }
            self.tail = Some(id);
            self.nseg += 1;
            debug_assert!(!segment.evictable(), "segment should not be evictable");
            segment.set_evictable(true);
            segment.set_accessible(true);
            Ok(())
        } else {
            Err(TtlBucketsError::NoFreeSegments)
        }
    }