Struct MemoryStore 

pub struct MemoryStore { /* private fields */ }

Overrides in a map, for a single process.

Cheap to clone, and clones share one map, so the store can be handed to a Flags and still be written to from an admin route.

The limitation is the obvious one and it is worth saying out loud: an override set here reaches this process and no other. On one machine that is everything; behind a load balancer it means an operator turning a flag off has turned it off for a third of the traffic. This is the right store for a single-process application, for tests, and for a default that works before anybody has chosen a database — and the wrong one for an incident switch across a fleet.

Implementations

impl MemoryStore

pub fn new() -> Self

pub fn len(&self) -> usize

How many overrides are stored. Mostly for tests and a status page.

pub fn is_empty(&self) -> bool

Trait Implementations

impl Clone for MemoryStore

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Default for MemoryStore

fn default() -> Self

Returns the “default value” for a type.

impl FlagStore for MemoryStore

fn name(&self) -> &'static str

The store’s name, for error messages and boot logs.

fn get<'a>( &'a self, flag: &'a str, scope: &'a Scope, ) -> BoxFuture<'a, Result<Option<bool>>>

The override for one flag and scope: None when nobody has set one.

fn set<'a>( &'a self, flag: &'a str, scope: &'a Scope, value: bool, ) -> BoxFuture<'a, Result<()>>

Write an override, replacing any that was there.

fn forget<'a>( &'a self, flag: &'a str, scope: &'a Scope, ) -> BoxFuture<'a, Result<()>>

Remove an override, putting the flag back in the resolver’s hands.

fn flush(&self) -> BoxFuture<'_, Result<()>>

Remove every override this store holds.