Struct Transaction

pub struct Transaction {
    pub meta: GenericHashMap<String, Arc<dyn Any>, RandomState, ArcK>,
    pub id: u64,
    /* private fields */
}

事务结构体，用于管理文档的修改操作

Fields

meta: GenericHashMap<String, Arc<dyn Any>, RandomState, ArcK>

存储元数据的哈希表，支持任意类型数据

id: u64

事务的时间戳

Implementations

impl Transaction

pub fn new(state: &State) -> Transaction

创建新的事务实例 state: 当前状态对象 返回: Transaction 实例

pub fn merge(&mut self, other: &mut Transaction)

pub fn doc(&self) -> Arc<NodePool>

获取当前文档状态

pub fn set_node_attribute( &mut self, id: String, values: GenericHashMap<String, Value, RandomState, ArcK>, ) -> Result<(), Error>

设置节点属性 id: 节点ID values: 属性键值对

pub fn add_node( &mut self, parent_id: String, nodes: Vec<NodeEnum>, ) -> Result<(), Error>

添加新节点 parent_id: 父节点ID node: 要添加的节点

pub fn remove_node( &mut self, parent_id: String, node_ids: Vec<String>, ) -> Result<(), Error>

删除节点 id: 节点ID nodes: 要删除的节点

pub fn add_mark(&mut self, id: String, marks: Vec<Mark>) -> Result<(), Error>

添加标记 id: 节点ID marks: 要添加的标记

pub fn remove_mark( &mut self, id: String, mark_types: Vec<String>, ) -> Result<(), Error>

删除标记 id: 节点ID marks: 要删除的标记

pub fn set_meta<K, T>(&mut self, key: K, value: T) -> &mut Transaction

where T: 'static, K: Into<String>,

设置元数据 key: 键 value: 值（支持任意类型）

pub fn get_meta<T>(&self, key: &str) -> Option<T>

where T: Clone + 'static,

获取元数据 key: 键 返回: Option<&T>，如果存在且类型匹配则返回Some，否则返回None

Methods from Deref<Target = Transform>

pub fn doc(&self) -> Arc<NodePool>

获取当前文档状态，使用延迟计算

pub fn step(&mut self, step: Arc<dyn Step>) -> Result<(), Error>

pub fn doc_changed(&self) -> bool

检查文档是否被修改

pub fn apply_steps_batch( &mut self, steps: Vec<Arc<dyn Step>>, ) -> Result<(), Error>

批量应用步骤（优化版本）

pub fn commit(&mut self)

提交更改，将当前状态设为新的基础状态 保留历史记录（steps 和 invert_steps）以支持回滚功能

pub fn rollback(&mut self)

回滚所有未提交的更改

pub fn rollback_steps(&mut self, count: usize) -> Result<(), Error>

回滚指定数量的步骤

pub fn clear_history(&mut self)

清除历史记录（释放内存）

pub fn history_size(&self) -> usize

获取历史记录大小

Trait Implementations

impl Clone for Transaction

fn clone(&self) -> Transaction

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Transaction

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

Formats the value using the given formatter.

impl Deref for Transaction

type Target = Transform

The resulting type after dereferencing.

fn deref(&self) -> &<Transaction as Deref>::Target

Dereferences the value.

impl DerefMut for Transaction

fn deref_mut(&mut self) -> &mut <Transaction as Deref>::Target

Mutably dereferences the value.

impl Send for Transaction

impl Sync for Transaction