Enum SagaConcurrencyError 

#[non_exhaustive]
pub enum SagaConcurrencyError {
    StaleSnapshot,
    DuplicateTrigger,
}

业务作用：保留状态迁移 CAS 未生效的确定性并发裁决，禁止协议层解析错误文本。

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

StaleSnapshot

调用方使用的实例状态或版本快照已经过期。

DuplicateTrigger

相同触发身份已经提交过另一条迁移。

Implementations

impl SagaConcurrencyError

pub fn from_error(error: &Error) -> Option<Self>

业务作用：从事务与调用上下文包裹的错误链中提取 CAS 并发裁决。

参数说明：

• error：是状态迁移调用返回的完整错误链。

返回：包含确定性并发裁决时返回对应类别；其它失败返回 None。

Trait Implementations

impl Clone for SagaConcurrencyError

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for SagaConcurrencyError

impl Debug for SagaConcurrencyError

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

Formats the value using the given formatter.

impl Display for SagaConcurrencyError

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

业务作用：输出不携带实例身份与业务数据的稳定 CAS 裁决摘要。

参数说明：

• formatter：是标准格式化输出目标。

返回：摘要写入成功时返回 Ok；格式化失败返回对应错误。

impl Eq for SagaConcurrencyError

impl Error for SagaConcurrencyError

fn source(&self) -> Option<&(dyn Error + 'static)>

Returns the lower-level source of this error, if any.

fn description(&self) -> &str

👎Deprecated since 1.42.0:

use the Display impl or to_string()

fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0:

replaced by Error::source, which can support downcasting

fn provide<'a>(&'a self, request: &mut Request<'a>)

🔬This is a nightly-only experimental API. (error_generic_member_access)

Provides type-based access to context intended for error reports.

impl PartialEq for SagaConcurrencyError

fn eq(&self, other: &Self) -> bool

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for SagaConcurrencyError