Enum LifecycleError 

pub enum LifecycleError {
    Terminal {
        event: LifecycleEvent,
    },
    IllegalTransition {
        state: SessionState,
        event: LifecycleEvent,
    },
}

Why a lifecycle transition was refused.

Every variant is a case where guessing an edge would invent a state the protocol never described — there is deliberately no “force” arm.

Variants

Terminal

The session has finished and admits nothing.

Fields

event: LifecycleEvent

The event that was refused.

IllegalTransition

The event does not apply to the state the session is in.

Fields

state: SessionState

The state the session is in.

event: LifecycleEvent

The event that was refused.

Implementations

impl LifecycleError

pub const fn is_final(self) -> bool

Whether the refusal is final rather than a “not yet”.

A caller that batches transitions — draining a transport, say — needs to tell “you are early” from “stop asking”. Only a closed session is final.

Trait Implementations

impl Clone for LifecycleError

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for LifecycleError

impl Debug for LifecycleError

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

Formats the value using the given formatter.

impl Display for LifecycleError

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

Formats the value using the given formatter.

impl Eq for LifecycleError

impl Error for LifecycleError

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<LifecycleError> for EngineError

fn from(source: LifecycleError) -> Self

Converts to this type from the input type.

impl PartialEq for LifecycleError

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for LifecycleError