Enum aws_sdk_kinesis::model::MetricsName
source · #[non_exhaustive]
pub enum MetricsName {
All,
IncomingBytes,
IncomingRecords,
IteratorAgeMilliseconds,
OutgoingBytes,
OutgoingRecords,
ReadProvisionedThroughputExceeded,
WriteProvisionedThroughputExceeded,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against MetricsName
, 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 metricsname = unimplemented!();
match metricsname {
MetricsName::All => { /* ... */ },
MetricsName::IncomingBytes => { /* ... */ },
MetricsName::IncomingRecords => { /* ... */ },
MetricsName::IteratorAgeMilliseconds => { /* ... */ },
MetricsName::OutgoingBytes => { /* ... */ },
MetricsName::OutgoingRecords => { /* ... */ },
MetricsName::ReadProvisionedThroughputExceeded => { /* ... */ },
MetricsName::WriteProvisionedThroughputExceeded => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when metricsname
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant MetricsName::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
MetricsName::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 MetricsName::NewFeature
is defined.
Specifically, when metricsname
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on MetricsName::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
All
IncomingBytes
IncomingRecords
IteratorAgeMilliseconds
OutgoingBytes
OutgoingRecords
ReadProvisionedThroughputExceeded
WriteProvisionedThroughputExceeded
Unknown(UnknownVariantValue)
Unknown
contains new variants that have been added since this code was generated.
Implementations§
Trait Implementations§
source§impl AsRef<str> for MetricsName
impl AsRef<str> for MetricsName
source§impl Clone for MetricsName
impl Clone for MetricsName
source§fn clone(&self) -> MetricsName
fn clone(&self) -> MetricsName
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for MetricsName
impl Debug for MetricsName
source§impl From<&str> for MetricsName
impl From<&str> for MetricsName
source§impl FromStr for MetricsName
impl FromStr for MetricsName
source§impl Hash for MetricsName
impl Hash for MetricsName
source§impl Ord for MetricsName
impl Ord for MetricsName
source§fn cmp(&self, other: &MetricsName) -> Ordering
fn cmp(&self, other: &MetricsName) -> Ordering
1.21.0 · source§fn max(self, other: Self) -> Selfwhere
Self: Sized,
fn max(self, other: Self) -> Selfwhere
Self: Sized,
source§impl PartialEq<MetricsName> for MetricsName
impl PartialEq<MetricsName> for MetricsName
source§fn eq(&self, other: &MetricsName) -> bool
fn eq(&self, other: &MetricsName) -> bool
self
and other
values to be equal, and is used
by ==
.source§impl PartialOrd<MetricsName> for MetricsName
impl PartialOrd<MetricsName> for MetricsName
source§fn partial_cmp(&self, other: &MetricsName) -> Option<Ordering>
fn partial_cmp(&self, other: &MetricsName) -> 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 MetricsName
impl StructuralEq for MetricsName
impl StructuralPartialEq for MetricsName
Auto Trait Implementations§
impl RefUnwindSafe for MetricsName
impl Send for MetricsName
impl Sync for MetricsName
impl Unpin for MetricsName
impl UnwindSafe for MetricsName
Blanket Implementations§
source§impl<Q, K> Equivalent<K> for Qwhere
Q: Eq + ?Sized,
K: Borrow<Q> + ?Sized,
impl<Q, K> Equivalent<K> for Qwhere
Q: Eq + ?Sized,
K: Borrow<Q> + ?Sized,
source§fn equivalent(&self, key: &K) -> bool
fn equivalent(&self, key: &K) -> bool
key
and return true
if they are equal.