Method insert

block/src/qcow/vec_cache.rs:142–157

Check if the refblock cache is full and we need to evict.

(&mut self, index: usize, block: T, write_callback: F)

    // Check if the refblock cache is full and we need to evict.
    pub fn insert<F>(&mut self, index: usize, block: T, write_callback: F) -> io::Result<()>
    where
        F: FnOnce(usize, T) -> io::Result<()>,
    {
        if self.map.len() == self.capacity {
            // TODO(dgreid) - smarter eviction strategy.
            let to_evict = *self.map.iter().next().unwrap().0;
            if let Some(evicted) = self.map.remove(&to_evict)
                && evicted.dirty()
            {
                write_callback(to_evict, evicted)?;
            }
        }
        self.map.insert(index, block);
        Ok(())
    }
}

#[cfg(test)]