Enum CheckpointResult 

pub enum CheckpointResult<T, E> {
    Ok(T),
    Err(E),
}

Represent the checkpointed outcome of a durable step operation.

Unlike std::result::Result, both the success and error values in a CheckpointResult are valid, serialized checkpoint data. A step that returns an error still has that error checkpointed and replayed identically on subsequent invocations.

Type Parameters

• T — The success value type. Must implement Serialize + DeserializeOwned.
• E — The error value type. Must implement Serialize + DeserializeOwned.

Examples

use durable_lambda_core::types::CheckpointResult;

// A successful checkpoint result.
let ok: CheckpointResult<i32, String> = CheckpointResult::Ok(42);
assert_eq!(ok, CheckpointResult::Ok(42));

// An error checkpoint result — the error is also checkpointed.
let err: CheckpointResult<i32, String> = CheckpointResult::Err("validation failed".into());

// Both variants serialize to JSON for checkpoint storage.
let json = serde_json::to_string(&ok).unwrap();
let deserialized: CheckpointResult<i32, String> = serde_json::from_str(&json).unwrap();
assert_eq!(deserialized, CheckpointResult::Ok(42));

Variants

Ok(T)

The step completed successfully with this value.

Err(E)

The step returned an error, which is also checkpointed.

Trait Implementations

impl<T, E> Clone for CheckpointResult<T, E>

where T: Clone, E: Clone,

fn clone(&self) -> CheckpointResult<T, E>

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<T, E> Debug for CheckpointResult<T, E>

where T: Debug, E: Debug,

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl<'de, T, E> Deserialize<'de> for CheckpointResult<T, E>

where T: Deserialize<'de>, E: Deserialize<'de>,

fn deserialize<__D>( __deserializer: __D, ) -> Result<CheckpointResult<T, E>, <__D as Deserializer<'de>>::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl<T, E> PartialEq for CheckpointResult<T, E>

where T: PartialEq, E: PartialEq,

fn eq(&self, other: &CheckpointResult<T, E>) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<T, E> Serialize for CheckpointResult<T, E>

where T: Serialize, E: Serialize,

fn serialize<__S>( &self, __serializer: __S, ) -> Result<<__S as Serializer>::Ok, <__S as Serializer>::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl<T, E> StructuralPartialEq for CheckpointResult<T, E>