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use tokio::time::Instant; use super::{DataCommitRequest, DataLoadRequest}; pub trait LoadFromUpstream<Key, Data>: Send + 'static { fn load(&mut self, request: DataLoadRequest<Key, Data>); } pub trait CommitToUpstream<Key, Data>: Send + 'static { fn commit<'a>(&mut self, request: DataCommitRequest<'a, Key, Data>); } pub trait UpstreamFactory<Key, Data: ServiceData> { type Upstream: LoadFromUpstream<Key, Data>; fn create(&mut self) -> Self::Upstream; } impl<Key, Data: ServiceData, T: Clone + LoadFromUpstream<Key, Data>> UpstreamFactory<Key, Data> for T { type Upstream = Self; fn create(&mut self) -> Self::Upstream { self.clone() } } pub trait MutableUpstreamFactory<Key, Data: ServiceData> { type Upstream: LoadFromUpstream<Key, Data> + CommitToUpstream<Key, Data>; fn create(&mut self) -> Self::Upstream; } impl< Key, Data: ServiceData, T: Clone + LoadFromUpstream<Key, Data> + CommitToUpstream<Key, Data>, > MutableUpstreamFactory<Key, Data> for T { type Upstream = Self; fn create(&mut self) -> Self::Upstream { self.clone() } } pub trait ServiceData: Send + 'static { fn should_persist(&self) -> bool { true } fn get_expires_at(&self) -> Option<&Instant> { None } } impl<T: ServiceData> ServiceData for Option<T> { fn should_persist(&self) -> bool { self.is_some() } fn get_expires_at(&self) -> Option<&Instant> { self.as_ref().and_then(|x| x.get_expires_at()) } }