Enum CachedData 

pub enum CachedData<T> {
    Uncached {
        prev: Option<Arc<T>>,
    },
    Waiting {
        prev: Option<Arc<T>>,
    },
    Filled(Arc<T>),
}

A piece of data which we cache from Cxxrtl

Variants

Uncached

The data cache is invalidated, the previously held data if it is still useful is kept

Fields

prev: Option<Arc<T>>

Waiting

The data cache is invalidated, and a request has been made for new data. However, the new data has not been received yet. If the previous data is not useless, it can be stored here

Fields

prev: Option<Arc<T>>

Filled(Arc<T>)

The cache is up-to-date

Implementations

impl<T> CachedData<T>

fn empty() -> Self

fn make_uncached(&self) -> Self

pub fn filled(t: T) -> Self

fn get(&self) -> Option<Arc<T>>

impl<T> CachedData<T>

where T: Clone,

fn fetch_if_needed(&mut self, f: impl FnOnce()) -> Option<Arc<T>>

Return the current value from the cache if it is there. If the cache is Uncached run f to fetch the new value. The function must make sure that the cache is updated eventually. The state is changed to Waiting