Enum TtlExtensionPolicy

#[non_exhaustive]
pub enum TtlExtensionPolicy {
    OnEveryRequest,
    OnStateChanges,
}

Available on crate feature session only.

Configuration for which events should trigger an extension of the time-to-live for your session.

If you are using a [BrowserSession], TtlExtensionPolicy controls how often the TTL of the session state should be refreshed. The browser is in control of the lifecycle of the session cookie.

If you are using a PersistentSession, TtlExtensionPolicy controls both the expiration of the session cookie and the TTL of the session state on the storage backend.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

OnEveryRequest

The TTL is refreshed every time the server receives a request associated with a session.

Performance impact

Refreshing the TTL on every request is not free. It implies a refresh of the TTL on the session state. This translates into a request over the network if you are using a remote system as storage backend (e.g. Redis). This impacts both the total load on your storage backend (i.e. number of queries it has to handle) and the latency of the requests served by your server.

OnStateChanges

The TTL is refreshed every time the session state changes or the session key is renewed.

Trait Implementations

impl Clone for TtlExtensionPolicy

fn clone(&self) -> TtlExtensionPolicy

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for TtlExtensionPolicy

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

Formats the value using the given formatter.