#[non_exhaustive]pub enum GrpcRetryPolicyEvent {
Cancelled,
DeadlineExceeded,
Internal,
ResourceExhausted,
Unavailable,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against GrpcRetryPolicyEvent
, it is important to ensure
your code is forward-compatible. That is, if a match arm handles a case for a
feature that is supported by the service but has not been represented as an enum
variant in a current version of SDK, your code should continue to work when you
upgrade SDK to a future version in which the enum does include a variant for that
feature.
Here is an example of how you can make a match expression forward-compatible:
# let grpcretrypolicyevent = unimplemented!();
match grpcretrypolicyevent {
GrpcRetryPolicyEvent::Cancelled => { /* ... */ },
GrpcRetryPolicyEvent::DeadlineExceeded => { /* ... */ },
GrpcRetryPolicyEvent::Internal => { /* ... */ },
GrpcRetryPolicyEvent::ResourceExhausted => { /* ... */ },
GrpcRetryPolicyEvent::Unavailable => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when grpcretrypolicyevent
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant GrpcRetryPolicyEvent::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
GrpcRetryPolicyEvent::Unknown(UnknownVariantValue("NewFeature".to_owned()))
and calling as_str
on it yields "NewFeature"
.
This match expression is forward-compatible when executed with a newer
version of SDK where the variant GrpcRetryPolicyEvent::NewFeature
is defined.
Specifically, when grpcretrypolicyevent
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on GrpcRetryPolicyEvent::NewFeature
also yielding "NewFeature"
.
Explicitly matching on the Unknown
variant should
be avoided for two reasons:
- The inner data
UnknownVariantValue
is opaque, and no further information can be extracted. - It might inadvertently shadow other intended match arms.
Variants (Non-exhaustive)§
This enum is marked as non-exhaustive
Cancelled
DeadlineExceeded
Internal
ResourceExhausted
Unknown(UnknownVariantValue)
Unknown
. See the docs on this enum for the correct way to handle unknown variants.Unknown
contains new variants that have been added since this code was generated.
Implementations§
source§impl GrpcRetryPolicyEvent
impl GrpcRetryPolicyEvent
sourcepub fn try_parse(value: &str) -> Result<Self, UnknownVariantError>
pub fn try_parse(value: &str) -> Result<Self, UnknownVariantError>
Parses the enum value while disallowing unknown variants.
Unknown variants will result in an error.
Trait Implementations§
source§impl AsRef<str> for GrpcRetryPolicyEvent
impl AsRef<str> for GrpcRetryPolicyEvent
source§impl Clone for GrpcRetryPolicyEvent
impl Clone for GrpcRetryPolicyEvent
source§fn clone(&self) -> GrpcRetryPolicyEvent
fn clone(&self) -> GrpcRetryPolicyEvent
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for GrpcRetryPolicyEvent
impl Debug for GrpcRetryPolicyEvent
source§impl Display for GrpcRetryPolicyEvent
impl Display for GrpcRetryPolicyEvent
source§impl From<&str> for GrpcRetryPolicyEvent
impl From<&str> for GrpcRetryPolicyEvent
source§impl FromStr for GrpcRetryPolicyEvent
impl FromStr for GrpcRetryPolicyEvent
source§impl Hash for GrpcRetryPolicyEvent
impl Hash for GrpcRetryPolicyEvent
source§impl Ord for GrpcRetryPolicyEvent
impl Ord for GrpcRetryPolicyEvent
source§fn cmp(&self, other: &GrpcRetryPolicyEvent) -> Ordering
fn cmp(&self, other: &GrpcRetryPolicyEvent) -> Ordering
1.21.0 · source§fn max(self, other: Self) -> Selfwhere
Self: Sized,
fn max(self, other: Self) -> Selfwhere
Self: Sized,
source§impl PartialEq for GrpcRetryPolicyEvent
impl PartialEq for GrpcRetryPolicyEvent
source§fn eq(&self, other: &GrpcRetryPolicyEvent) -> bool
fn eq(&self, other: &GrpcRetryPolicyEvent) -> bool
self
and other
values to be equal, and is used
by ==
.source§impl PartialOrd for GrpcRetryPolicyEvent
impl PartialOrd for GrpcRetryPolicyEvent
source§fn partial_cmp(&self, other: &GrpcRetryPolicyEvent) -> Option<Ordering>
fn partial_cmp(&self, other: &GrpcRetryPolicyEvent) -> Option<Ordering>
1.0.0 · source§fn le(&self, other: &Rhs) -> bool
fn le(&self, other: &Rhs) -> bool
self
and other
) and is used by the <=
operator. Read moreimpl Eq for GrpcRetryPolicyEvent
impl StructuralPartialEq for GrpcRetryPolicyEvent
Auto Trait Implementations§
impl Freeze for GrpcRetryPolicyEvent
impl RefUnwindSafe for GrpcRetryPolicyEvent
impl Send for GrpcRetryPolicyEvent
impl Sync for GrpcRetryPolicyEvent
impl Unpin for GrpcRetryPolicyEvent
impl UnwindSafe for GrpcRetryPolicyEvent
Blanket Implementations§
source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
source§impl<Q, K> Comparable<K> for Q
impl<Q, K> Comparable<K> for Q
source§impl<Q, K> Equivalent<K> for Q
impl<Q, K> Equivalent<K> for Q
source§impl<Q, K> Equivalent<K> for Q
impl<Q, K> Equivalent<K> for Q
source§fn equivalent(&self, key: &K) -> bool
fn equivalent(&self, key: &K) -> bool
key
and return true
if they are equal.source§impl<T> Instrument for T
impl<T> Instrument for T
source§fn instrument(self, span: Span) -> Instrumented<Self>
fn instrument(self, span: Span) -> Instrumented<Self>
source§fn in_current_span(self) -> Instrumented<Self>
fn in_current_span(self) -> Instrumented<Self>
source§impl<T> IntoEither for T
impl<T> IntoEither for T
source§fn into_either(self, into_left: bool) -> Either<Self, Self>
fn into_either(self, into_left: bool) -> Either<Self, Self>
self
into a Left
variant of Either<Self, Self>
if into_left
is true
.
Converts self
into a Right
variant of Either<Self, Self>
otherwise. Read moresource§fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
self
into a Left
variant of Either<Self, Self>
if into_left(&self)
returns true
.
Converts self
into a Right
variant of Either<Self, Self>
otherwise. Read more