Struct MessageMetadata 

pub struct MessageMetadata {
    pub id: String,
    pub timestamp: u64,
    pub properties: HashMap<String, String>,
}

消息元数据

用于携带额外的消息属性。

Fields

id: String

消息 ID

timestamp: u64

时间戳（毫秒）

properties: HashMap<String, String>

自定义属性

Implementations

impl MessageMetadata

pub fn new() -> Self

创建新的元数据

pub fn with_property( self, key: impl Into<String>, value: impl Into<String>, ) -> Self

添加属性

Trait Implementations

impl Clone for MessageMetadata

fn clone(&self) -> MessageMetadata

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for MessageMetadata

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

Formats the value using the given formatter.

impl Default for MessageMetadata

fn default() -> Self

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for MessageMetadata

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for MessageMetadata

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

where __S: Serializer,

Serialize this value into the given Serde serializer.