Struct SessionCheckpoint 

pub struct SessionCheckpoint<S: WorkflowState = State>
where
    S::Checkpoint: Debug,
{
    pub state: S::Checkpoint,
    pub frames: FrameStack<S>,
    pub graph_hash: u64,
}

会话检查点 — 完整恢复快照。

包含：

• 状态投影（P0-1: S::Checkpoint）
• FrameStack（执行位置历史）
• graph_hash（P0-2: canonical hash）

可序列化 — 用于持久化到文件/数据库。

与 Checkpoint 的区别

• Checkpoint<S> — 单个 Graph 的检查点（current_node + state）
• SessionCheckpoint<S> — 完整会话的检查点（state + frames + graph_hash）

Fields

state: S::Checkpoint

物化状态快照（P0-1: 使用 Checkpoint 关联类型）

frames: FrameStack<S>

执行帧栈（完整执行位置历史）

graph_hash: u64

图结构指纹（P0-2: canonical hash）

Trait Implementations

impl<S: Clone + WorkflowState> Clone for SessionCheckpoint<S>

where S::Checkpoint: Debug + Clone,

fn clone(&self) -> SessionCheckpoint<S>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<S: Debug + WorkflowState> Debug for SessionCheckpoint<S>

where S::Checkpoint: Debug + Debug,

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

Formats the value using the given formatter.

impl<'de, S> Deserialize<'de> for SessionCheckpoint<S>

where S::Checkpoint: Debug + Deserialize<'de>, S: Deserialize<'de> + WorkflowState,

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl<S> Serialize for SessionCheckpoint<S>

where S::Checkpoint: Debug + Serialize, S: Serialize + WorkflowState,

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

where __S: Serializer,

Serialize this value into the given Serde serializer.