Enum RecycleStrategy 

pub enum RecycleStrategy {
    SelectOne,
    Ping,
    None,
    Custom(RecycleCheck),
}

Strategy used by the async Pool to validate a connection when it is checked back out (recycled).

Defaults to SelectOne. The probe runs on every acquire after the connection’s passive liveness check; a failing probe evicts the connection and the pool transparently builds a fresh one.

Variants

SelectOne

Run a SELECT 1 round-trip on every checkout. The default — catches a half-dead connection at acquire time at the cost of one round-trip.

Ping

Call AsyncConnection::ping on every checkout (equivalent round-trip, expressed via the connection’s own health primitive).

None

Skip the active probe entirely. The pool still drops connections that fail the passive AsyncConnection::is_alive check. Use on hot paths where the round-trip cost outweighs detecting a dead connection early.

Custom(RecycleCheck)

Run a user-supplied async check on every checkout.

Trait Implementations

impl Clone for RecycleStrategy

fn clone(&self) -> RecycleStrategy

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for RecycleStrategy

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

Formats the value using the given formatter.

impl Default for RecycleStrategy

fn default() -> RecycleStrategy

Returns the “default value” for a type.