#[non_exhaustive]pub enum InferredWorkloadType {
AmazonEmr,
ApacheCassandra,
ApacheHadoop,
Kafka,
Memcached,
Nginx,
PostgreSql,
Redis,
Sqlserver,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against InferredWorkloadType
, 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 inferredworkloadtype = unimplemented!();
match inferredworkloadtype {
InferredWorkloadType::AmazonEmr => { /* ... */ },
InferredWorkloadType::ApacheCassandra => { /* ... */ },
InferredWorkloadType::ApacheHadoop => { /* ... */ },
InferredWorkloadType::Kafka => { /* ... */ },
InferredWorkloadType::Memcached => { /* ... */ },
InferredWorkloadType::Nginx => { /* ... */ },
InferredWorkloadType::PostgreSql => { /* ... */ },
InferredWorkloadType::Redis => { /* ... */ },
InferredWorkloadType::Sqlserver => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when inferredworkloadtype
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant InferredWorkloadType::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
InferredWorkloadType::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 InferredWorkloadType::NewFeature
is defined.
Specifically, when inferredworkloadtype
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on InferredWorkloadType::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
AmazonEmr
ApacheCassandra
ApacheHadoop
Kafka
Memcached
Nginx
PostgreSql
Redis
Sqlserver
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 InferredWorkloadType
impl InferredWorkloadType
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 InferredWorkloadType
impl AsRef<str> for InferredWorkloadType
source§impl Clone for InferredWorkloadType
impl Clone for InferredWorkloadType
source§fn clone(&self) -> InferredWorkloadType
fn clone(&self) -> InferredWorkloadType
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for InferredWorkloadType
impl Debug for InferredWorkloadType
source§impl Display for InferredWorkloadType
impl Display for InferredWorkloadType
source§impl From<&str> for InferredWorkloadType
impl From<&str> for InferredWorkloadType
source§impl FromStr for InferredWorkloadType
impl FromStr for InferredWorkloadType
source§impl Hash for InferredWorkloadType
impl Hash for InferredWorkloadType
source§impl Ord for InferredWorkloadType
impl Ord for InferredWorkloadType
source§fn cmp(&self, other: &InferredWorkloadType) -> Ordering
fn cmp(&self, other: &InferredWorkloadType) -> 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 InferredWorkloadType
impl PartialEq for InferredWorkloadType
source§fn eq(&self, other: &InferredWorkloadType) -> bool
fn eq(&self, other: &InferredWorkloadType) -> bool
self
and other
values to be equal, and is used
by ==
.source§impl PartialOrd for InferredWorkloadType
impl PartialOrd for InferredWorkloadType
source§fn partial_cmp(&self, other: &InferredWorkloadType) -> Option<Ordering>
fn partial_cmp(&self, other: &InferredWorkloadType) -> 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 InferredWorkloadType
impl StructuralPartialEq for InferredWorkloadType
Auto Trait Implementations§
impl Freeze for InferredWorkloadType
impl RefUnwindSafe for InferredWorkloadType
impl Send for InferredWorkloadType
impl Sync for InferredWorkloadType
impl Unpin for InferredWorkloadType
impl UnwindSafe for InferredWorkloadType
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