Trait feattle::Feattles [−][src]
pub trait Feattles<P>: FeattlesPrivate<P> {
fn new(persistence: P) -> Self;
fn persistence(&self) -> &P;
fn keys(&self) -> &'static [&'static str];
fn definition(&self, key: &str) -> Option<FeattleDefinition>;
fn last_reload(&self) -> LastReload { ... }
fn current_values(
&self
) -> Option<MappedRwLockReadGuard<'_, RawRwLock, CurrentValues>> { ... }
fn reload<'life0, 'async_trait>(
&'life0 self
) -> Pin<Box<dyn Future<Output = Result<(), <P as Persist>::Error>> + Send + 'async_trait, Global>>
where
'life0: 'async_trait,
Self: 'async_trait + Sync,
P: 'static + Persist + Sync,
{ ... }
fn update<'life0, 'life1, 'async_trait>(
&'life0 self,
key: &'life1 str,
value: Value,
modified_by: String
) -> Pin<Box<dyn Future<Output = Result<(), UpdateError<<P as Persist>::Error>>> + Send + 'async_trait, Global>>
where
'life0: 'async_trait,
'life1: 'async_trait,
Self: 'async_trait + Sync,
P: 'static + Persist + Sync,
{ ... }
fn definitions(&self) -> Vec<FeattleDefinition, Global> { ... }
fn history<'life0, 'life1, 'async_trait>(
&'life0 self,
key: &'life1 str
) -> Pin<Box<dyn Future<Output = Result<ValueHistory, HistoryError<<P as Persist>::Error>>> + Send + 'async_trait, Global>>
where
'life0: 'async_trait,
'life1: 'async_trait,
Self: 'async_trait + Sync,
P: 'static + Persist + Sync,
{ ... }
}
Expand description
The main trait of this crate.
The struct created with feattles!
will implement this trait in addition to a method for each
feattle. Read more at the crate documentation.
Required methods
Create a new feattles instance, using the given persistence layer logic.
All feattles will start with their default values. You can force an initial synchronization
with Feattles::update
.
fn persistence(&self) -> &P
fn persistence(&self) -> &P
Return a shared reference to the persistence layer.
fn keys(&self) -> &'static [&'static str]
fn keys(&self) -> &'static [&'static str]
The list of all available keys.
fn definition(&self, key: &str) -> Option<FeattleDefinition>
fn definition(&self, key: &str) -> Option<FeattleDefinition>
Describe one specific feattle, returning None
if the feattle with the given name does not
exist.
Provided methods
fn last_reload(&self) -> LastReload
fn last_reload(&self) -> LastReload
Return details of the last time the data was synchronized by calling Feattles::reload()
.
fn current_values(
&self
) -> Option<MappedRwLockReadGuard<'_, RawRwLock, CurrentValues>>
fn current_values(
&self
) -> Option<MappedRwLockReadGuard<'_, RawRwLock, CurrentValues>>
Return a reference to the last synchronized data. The reference is behind a
read-write lock and will block any update until it is dropped. None
is returned if a
successful synchronization have never happened.
Reload the current feattles’ data from the persistence layer, propagating any errors produced by it.
If any of the feattle values fail to be parsed from previously persisted values, their
updates will be skipped. Other feattles that parsed successfully will still be updated.
In this case, a [log::error!
] will be generated for each time it occurs.
fn update<'life0, 'life1, 'async_trait>(
&'life0 self,
key: &'life1 str,
value: Value,
modified_by: String
) -> Pin<Box<dyn Future<Output = Result<(), UpdateError<<P as Persist>::Error>>> + Send + 'async_trait, Global>> where
'life0: 'async_trait,
'life1: 'async_trait,
Self: 'async_trait + Sync,
P: 'static + Persist + Sync,
fn update<'life0, 'life1, 'async_trait>(
&'life0 self,
key: &'life1 str,
value: Value,
modified_by: String
) -> Pin<Box<dyn Future<Output = Result<(), UpdateError<<P as Persist>::Error>>> + Send + 'async_trait, Global>> where
'life0: 'async_trait,
'life1: 'async_trait,
Self: 'async_trait + Sync,
P: 'static + Persist + Sync,
Update a single feattle, passing the new value (in JSON representation) and the user that is associated with this change. The change will be persisted directly.
While the update is happening, the new value will already be observable from other execution tasks or threads. However, if the update fails, the change will be rolled back.
Consistency
To avoid operating on stale data, before doing an update the caller should usually call
Feattles::reload()
to ensure data is current.
fn definitions(&self) -> Vec<FeattleDefinition, Global>
fn definitions(&self) -> Vec<FeattleDefinition, Global>
Return the definition for all the feattles.
fn history<'life0, 'life1, 'async_trait>(
&'life0 self,
key: &'life1 str
) -> Pin<Box<dyn Future<Output = Result<ValueHistory, HistoryError<<P as Persist>::Error>>> + Send + 'async_trait, Global>> where
'life0: 'async_trait,
'life1: 'async_trait,
Self: 'async_trait + Sync,
P: 'static + Persist + Sync,
fn history<'life0, 'life1, 'async_trait>(
&'life0 self,
key: &'life1 str
) -> Pin<Box<dyn Future<Output = Result<ValueHistory, HistoryError<<P as Persist>::Error>>> + Send + 'async_trait, Global>> where
'life0: 'async_trait,
'life1: 'async_trait,
Self: 'async_trait + Sync,
P: 'static + Persist + Sync,
Return the history for a single feattle. It can be potentially empty (not entries).