# 代办事项类图

```mermaid
classDiagram
    class TodoSourceService {
        <<abstract>>
        +agent_userid: str
        +redis: aioredis.Redis
        +get_todo_list() List~TodoItemData~*
        +get_todo_detail(item_id: str) TodoItemData*
    }

    class ApprovalTodoService {
        -redis: aioredis.Redis
        -agent_userid: str
        -semaphore: asyncio.Semaphore
        +get_todo_list() List~TodoItemData~
        +get_todo_detail(sp_no: str) TodoItemData
        -_fetch_approval_sp_no_list() List~str~
        -_fetch_approval_details(sp_no_list: List~str~) List~dict~
        -_filter_by_current_approver(details: List~dict~) List~dict~
        -_map_to_todo_item(detail: dict) TodoItemData
    }

    class ITSMService {
        -base_url: str
        -app_id: str
        -app_secret: str
        -redis: aioredis.Redis
        -agent_userid: str
        +get_todo_list() List~TodoItemData~
        +get_todo_detail(workitem_id: str) TodoItemData
        -_do_post(url: str, body: dict) dict
        -_get_workitem_detail(process_instance_id: int, executor: str) dict
    }

    class ITSMSigner {
        +compute_signature(app_id: str, timestamp: str, app_secret: str, biz_data: dict) str
        -_get_signature_compatible(params: dict) str
    }

    class TodoAggregatorService {
        -redis: aioredis.Redis
        -cache_ttl: int
        +get_todo_list(agent_userid: str, todo_type: Optional~str~) dict
        +get_todo_detail(agent_userid: str, item_id: str, todo_type: str) dict
        -_get_from_cache(agent_userid: str, todo_type: Optional~str~) Optional~dict~
        -_set_to_cache(agent_userid: str, todo_type: Optional~str~, data: dict) void
        -_invalidate_cache(agent_userid: str) void
    }

    class TodoItemData {
        +id: str
        +type: str
        +title: str
        +priority: str
        +description: dict
        +status: str
        +assigned_agent_id: Optional~str~
        +corp_id: str
        +created_at: str
        +updated_at: str
    }

    TodoSourceService <|-- ApprovalTodoService
    TodoSourceService <|-- ITSMService
    TodoAggregatorService o-- ApprovalTodoService : creates
    TodoAggregatorService o-- ITSMService : creates
    ITSMService --> ITSMSigner : uses
    TodoSourceService ..> TodoItemData : returns
```