#[non_exhaustive]pub enum ServiceLimit {
FileCacheCount,
FileSystemCount,
StorageVirtualMachinesPerFileSystem,
TotalInProgressCopyBackups,
TotalSsdIops,
TotalStorage,
TotalThroughputCapacity,
TotalUserInitiatedBackups,
TotalUserTags,
VolumesPerFileSystem,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against ServiceLimit
, 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 servicelimit = unimplemented!();
match servicelimit {
ServiceLimit::FileCacheCount => { /* ... */ },
ServiceLimit::FileSystemCount => { /* ... */ },
ServiceLimit::StorageVirtualMachinesPerFileSystem => { /* ... */ },
ServiceLimit::TotalInProgressCopyBackups => { /* ... */ },
ServiceLimit::TotalSsdIops => { /* ... */ },
ServiceLimit::TotalStorage => { /* ... */ },
ServiceLimit::TotalThroughputCapacity => { /* ... */ },
ServiceLimit::TotalUserInitiatedBackups => { /* ... */ },
ServiceLimit::TotalUserTags => { /* ... */ },
ServiceLimit::VolumesPerFileSystem => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when servicelimit
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant ServiceLimit::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
ServiceLimit::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 ServiceLimit::NewFeature
is defined.
Specifically, when servicelimit
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on ServiceLimit::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.
The types of limits on your service utilization. Limits include file system count, total throughput capacity, total storage, and total user-initiated backups. These limits apply for a specific account in a specific Amazon Web Services Region. You can increase some of them by contacting Amazon Web ServicesSupport.
Variants (Non-exhaustive)§
This enum is marked as non-exhaustive
FileCacheCount
FileSystemCount
StorageVirtualMachinesPerFileSystem
TotalInProgressCopyBackups
TotalSsdIops
TotalStorage
TotalThroughputCapacity
TotalUserInitiatedBackups
TotalUserTags
VolumesPerFileSystem
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 ServiceLimit
impl ServiceLimit
Source§impl ServiceLimit
impl ServiceLimit
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 ServiceLimit
impl AsRef<str> for ServiceLimit
Source§impl Clone for ServiceLimit
impl Clone for ServiceLimit
Source§fn clone(&self) -> ServiceLimit
fn clone(&self) -> ServiceLimit
1.0.0 · Source§const fn clone_from(&mut self, source: &Self)
const fn clone_from(&mut self, source: &Self)
source
. Read moreSource§impl Debug for ServiceLimit
impl Debug for ServiceLimit
Source§impl Display for ServiceLimit
impl Display for ServiceLimit
Source§impl From<&str> for ServiceLimit
impl From<&str> for ServiceLimit
Source§impl FromStr for ServiceLimit
impl FromStr for ServiceLimit
Source§impl Hash for ServiceLimit
impl Hash for ServiceLimit
Source§impl Ord for ServiceLimit
impl Ord for ServiceLimit
Source§fn cmp(&self, other: &ServiceLimit) -> Ordering
fn cmp(&self, other: &ServiceLimit) -> 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 ServiceLimit
impl PartialEq for ServiceLimit
Source§impl PartialOrd for ServiceLimit
impl PartialOrd for ServiceLimit
impl Eq for ServiceLimit
impl StructuralPartialEq for ServiceLimit
Auto Trait Implementations§
impl Freeze for ServiceLimit
impl RefUnwindSafe for ServiceLimit
impl Send for ServiceLimit
impl Sync for ServiceLimit
impl Unpin for ServiceLimit
impl UnwindSafe for ServiceLimit
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