#[non_exhaustive]pub enum WorkflowExecutionStatus {
Cancelled,
Completed,
Failed,
Pending,
RollbackCompleted,
RollbackInProgress,
Running,
Skipped,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against WorkflowExecutionStatus
, 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 workflowexecutionstatus = unimplemented!();
match workflowexecutionstatus {
WorkflowExecutionStatus::Cancelled => { /* ... */ },
WorkflowExecutionStatus::Completed => { /* ... */ },
WorkflowExecutionStatus::Failed => { /* ... */ },
WorkflowExecutionStatus::Pending => { /* ... */ },
WorkflowExecutionStatus::RollbackCompleted => { /* ... */ },
WorkflowExecutionStatus::RollbackInProgress => { /* ... */ },
WorkflowExecutionStatus::Running => { /* ... */ },
WorkflowExecutionStatus::Skipped => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when workflowexecutionstatus
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant WorkflowExecutionStatus::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
WorkflowExecutionStatus::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 WorkflowExecutionStatus::NewFeature
is defined.
Specifically, when workflowexecutionstatus
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on WorkflowExecutionStatus::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
Completed
Failed
Pending
RollbackCompleted
RollbackInProgress
Running
Skipped
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 WorkflowExecutionStatus
impl WorkflowExecutionStatus
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 WorkflowExecutionStatus
impl AsRef<str> for WorkflowExecutionStatus
Source§impl Clone for WorkflowExecutionStatus
impl Clone for WorkflowExecutionStatus
Source§fn clone(&self) -> WorkflowExecutionStatus
fn clone(&self) -> WorkflowExecutionStatus
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 WorkflowExecutionStatus
impl Debug for WorkflowExecutionStatus
Source§impl Display for WorkflowExecutionStatus
impl Display for WorkflowExecutionStatus
Source§impl From<&str> for WorkflowExecutionStatus
impl From<&str> for WorkflowExecutionStatus
Source§impl FromStr for WorkflowExecutionStatus
impl FromStr for WorkflowExecutionStatus
Source§impl Hash for WorkflowExecutionStatus
impl Hash for WorkflowExecutionStatus
Source§impl Ord for WorkflowExecutionStatus
impl Ord for WorkflowExecutionStatus
Source§fn cmp(&self, other: &WorkflowExecutionStatus) -> Ordering
fn cmp(&self, other: &WorkflowExecutionStatus) -> 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 WorkflowExecutionStatus
impl PartialEq for WorkflowExecutionStatus
Source§fn eq(&self, other: &WorkflowExecutionStatus) -> bool
fn eq(&self, other: &WorkflowExecutionStatus) -> bool
self
and other
values to be equal, and is used by ==
.Source§impl PartialOrd for WorkflowExecutionStatus
impl PartialOrd for WorkflowExecutionStatus
impl Eq for WorkflowExecutionStatus
impl StructuralPartialEq for WorkflowExecutionStatus
Auto Trait Implementations§
impl Freeze for WorkflowExecutionStatus
impl RefUnwindSafe for WorkflowExecutionStatus
impl Send for WorkflowExecutionStatus
impl Sync for WorkflowExecutionStatus
impl Unpin for WorkflowExecutionStatus
impl UnwindSafe for WorkflowExecutionStatus
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