Struct ReadOnlyFallback 

pub struct ReadOnlyFallback(/* private fields */);

Shared handle to a WritablePolicy::Prefer pool’s fallback state. See Self::on_connect and Self::on_acquire for the decisions it drives.

Implementations

impl ReadOnlyFallback

pub fn new() -> ReadOnlyFallback

pub fn on_connect(&self, read_only: bool, now: Instant) -> bool

after_connect decision for a freshly opened connection: accept it? A writable connection always clears the streak and is accepted. A read-only connection starts the streak (if none is running) and is rejected until now - streak_start >= FALLBACK_AFTER.

pub fn on_acquire(&self, read_only: bool, now: Instant) -> bool

before_acquire decision for a pooled connection: keep it? A writable connection clears the streak (the same as Self::on_connect) and is kept. A read-only connection is evicted immediately if no fallback streak is running (a writable connect has succeeded since the fallback, so this connection is stale) or if the streak hasn’t reached FALLBACK_AFTER yet (a connection turned read-only mid-pool, but we haven’t actually fallen back – on_connect’s window check doesn’t cover already-pooled connections, so this is the only place that can reject them). Once the window has elapsed, it’s evicted at most once per PROBE_INTERVAL, as a re-probe, and kept in between.

Trait Implementations

impl Clone for ReadOnlyFallback

fn clone(&self) -> ReadOnlyFallback

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ReadOnlyFallback

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl Default for ReadOnlyFallback

fn default() -> ReadOnlyFallback

Returns the “default value” for a type.