pub struct SubscriptionGuard { /* private fields */ }Expand description
RAII cleanup for one or more CoolEventBus subscriptions that all
share one lifecycle — e.g. the per-operation handlers a single
GET /rpc/subscribe/{op_id} connection registers for the duration of
its SSE stream (docs/design/rpc-transport.md §3.4a, cratestack#390).
Every tracked handle is unsubscribed when the guard drops, whether
that’s because the underlying stream ended normally (backpressure
overflow) or because it was cancelled mid-poll (an ordinary client
disconnect) — both just drop this guard the same way, so cleanup
doesn’t need to special-case which one happened. Without this, a
long-running server would accumulate one permanently-registered,
permanently-a-no-op handler per historical connection — a real
unbounded-memory footgun for a public, freely-reconnectable endpoint,
not a hypothetical one.
Implementations§
Source§impl SubscriptionGuard
impl SubscriptionGuard
pub fn new(bus: CoolEventBus) -> SubscriptionGuard
Sourcepub fn track(&mut self, handle: SubscriptionHandle)
pub fn track(&mut self, handle: SubscriptionHandle)
Adds a handle to the set this guard unsubscribes on drop.
Trait Implementations§
Source§impl Default for SubscriptionGuard
impl Default for SubscriptionGuard
Source§fn default() -> SubscriptionGuard
fn default() -> SubscriptionGuard
Source§impl Drop for SubscriptionGuard
impl Drop for SubscriptionGuard
Auto Trait Implementations§
impl Freeze for SubscriptionGuard
impl RefUnwindSafe for SubscriptionGuard
impl Send for SubscriptionGuard
impl Sync for SubscriptionGuard
impl Unpin for SubscriptionGuard
impl UnsafeUnpin for SubscriptionGuard
impl UnwindSafe for SubscriptionGuard
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