Struct FrontendHeartbeatExtensions 

pub struct FrontendHeartbeatExtensions {
    inner: Arc<Mutex<FrontendHeartbeatExtensionsInner>>,
}

A shareable, ordered registry of frontend heartbeat extensions.

Registration is available until FrontendHeartbeatExtensions::freeze is called. After that, membership is immutable so every heartbeat consumer observes the same extensions.

Fields

inner: Arc<Mutex<FrontendHeartbeatExtensionsInner>>

Implementations

impl FrontendHeartbeatExtensions

fn lock(&self) -> MutexGuard<'_, FrontendHeartbeatExtensionsInner>

pub fn register(&self, extension: Arc<dyn FrontendHeartbeatExtension>) -> bool

Registers an extension without replacing an existing extension of the same name.

Returns true for a new registration and false for an idempotent duplicate or when the registry is frozen. Use FrontendHeartbeatExtensions::try_register when the rejection reason must not be discarded.

pub fn try_register( &self, extension: Arc<dyn FrontendHeartbeatExtension>, ) -> Result<(), RegistrationError>

Registers an extension and returns the reason when registration is rejected.

If the registry is already frozen, this method returns RegistrationError::Frozen without calling FrontendHeartbeatExtension::name. If freezing races with name evaluation, the registry state is checked again before insertion.

pub fn freeze(&self)

Prevents further registrations while preserving the current registration order.

pub fn extensions(&self) -> Vec<Arc<dyn FrontendHeartbeatExtension>>

Returns the registered extensions in registration order.

pub fn response_handlers(&self) -> Vec<HeartbeatResponseHandlerRef>

Returns response handlers in extension registration order.

pub fn len(&self) -> usize

Returns the number of registered extensions.

pub fn is_empty(&self) -> bool

Returns whether no extension is registered.

Trait Implementations

impl Clone for FrontendHeartbeatExtensions

fn clone(&self) -> FrontendHeartbeatExtensions

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Default for FrontendHeartbeatExtensions

fn default() -> FrontendHeartbeatExtensions

Returns the “default value” for a type.