Enum aws_sdk_swf::types::DecisionType
source · #[non_exhaustive]pub enum DecisionType {
Show 14 variants
CancelTimer,
CancelWorkflowExecution,
CompleteWorkflowExecution,
ContinueAsNewWorkflowExecution,
FailWorkflowExecution,
RecordMarker,
RequestCancelActivityTask,
RequestCancelExternalWorkflowExecution,
ScheduleActivityTask,
ScheduleLambdaFunction,
SignalExternalWorkflowExecution,
StartChildWorkflowExecution,
StartTimer,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against DecisionType
, 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 decisiontype = unimplemented!();
match decisiontype {
DecisionType::CancelTimer => { /* ... */ },
DecisionType::CancelWorkflowExecution => { /* ... */ },
DecisionType::CompleteWorkflowExecution => { /* ... */ },
DecisionType::ContinueAsNewWorkflowExecution => { /* ... */ },
DecisionType::FailWorkflowExecution => { /* ... */ },
DecisionType::RecordMarker => { /* ... */ },
DecisionType::RequestCancelActivityTask => { /* ... */ },
DecisionType::RequestCancelExternalWorkflowExecution => { /* ... */ },
DecisionType::ScheduleActivityTask => { /* ... */ },
DecisionType::ScheduleLambdaFunction => { /* ... */ },
DecisionType::SignalExternalWorkflowExecution => { /* ... */ },
DecisionType::StartChildWorkflowExecution => { /* ... */ },
DecisionType::StartTimer => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when decisiontype
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant DecisionType::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
DecisionType::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 DecisionType::NewFeature
is defined.
Specifically, when decisiontype
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on DecisionType::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
CancelTimer
CancelWorkflowExecution
CompleteWorkflowExecution
ContinueAsNewWorkflowExecution
FailWorkflowExecution
RecordMarker
RequestCancelActivityTask
RequestCancelExternalWorkflowExecution
ScheduleActivityTask
ScheduleLambdaFunction
SignalExternalWorkflowExecution
StartChildWorkflowExecution
StartTimer
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 DecisionType
impl DecisionType
source§impl DecisionType
impl DecisionType
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 DecisionType
impl AsRef<str> for DecisionType
source§impl Clone for DecisionType
impl Clone for DecisionType
source§fn clone(&self) -> DecisionType
fn clone(&self) -> DecisionType
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for DecisionType
impl Debug for DecisionType
source§impl Display for DecisionType
impl Display for DecisionType
source§impl From<&str> for DecisionType
impl From<&str> for DecisionType
source§impl FromStr for DecisionType
impl FromStr for DecisionType
source§impl Hash for DecisionType
impl Hash for DecisionType
source§impl Ord for DecisionType
impl Ord for DecisionType
source§fn cmp(&self, other: &DecisionType) -> Ordering
fn cmp(&self, other: &DecisionType) -> 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 DecisionType
impl PartialEq for DecisionType
source§fn eq(&self, other: &DecisionType) -> bool
fn eq(&self, other: &DecisionType) -> bool
self
and other
values to be equal, and is used
by ==
.source§impl PartialOrd for DecisionType
impl PartialOrd for DecisionType
source§fn partial_cmp(&self, other: &DecisionType) -> Option<Ordering>
fn partial_cmp(&self, other: &DecisionType) -> 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 DecisionType
impl StructuralPartialEq for DecisionType
Auto Trait Implementations§
impl Freeze for DecisionType
impl RefUnwindSafe for DecisionType
impl Send for DecisionType
impl Sync for DecisionType
impl Unpin for DecisionType
impl UnwindSafe for DecisionType
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