Enum Error 

#[non_exhaustive]
pub enum Error {
    Stale(ResourceId),
    Busy(ResourceId),
    Draining(ResourceId),
    NotOwner(ResourceId),
    NotReserved(Lease),
    CreationBudget {
        key: Key,
        max_live: u32,
    },
    KeyFull {
        capacity: usize,
    },
    Full {
        capacity: usize,
    },
    Malformed(String),
    Io(Error),
}

Additions are expected: a cause discovered later lands here rather than in a new major version, so a caller matches what it handles and leaves the rest to a catch-all.

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.

Stale(ResourceId)

The id names a slot nothing occupies, or a generation that ended.

Busy(ResourceId)

Every unit of the resource’s capacity is leased right now.

Draining(ResourceId)

The owner is draining it; no new leases.

NotOwner(ResourceId)

Only the owner may do this to a resource.

NotReserved(Lease)

The lease is not among the resource’s unaccepted reservations: it was accepted already, aged out by the owner’s reconcile, or taken on a generation that ended.

CreationBudget

The key’s creation budget is spent: live plus in-progress reached the limit the caller gave.

Fields

key: Key

max_live: u32

KeyFull

Every key slot is taken.

Fields

capacity: usize

Full

Every resource slot in this process’s lane is taken.

Fields

capacity: usize

Malformed(String)

Io(Error)

Trait Implementations

impl Debug for Error

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

Formats the value using the given formatter.

impl Display for Error

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

Formats the value using the given formatter.

impl Error for Error

fn source(&self) -> Option<&(dyn Error + 'static)>

Returns the lower-level source of this error, if any.

fn description(&self) -> &str

👎Deprecated since 1.42.0:

use the Display impl or to_string()

fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0:

replaced by Error::source, which can support downcasting

fn provide<'a>(&'a self, request: &mut Request<'a>)

🔬This is a nightly-only experimental API. (error_generic_member_access)

Provides type-based access to context intended for error reports.

impl From<Error> for Error

fn from(value: Error) -> Self

Converts to this type from the input type.