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() -> MessageMetadata

创建新的元数据

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

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<(), Error>

Formats the value using the given formatter.

impl Default for MessageMetadata

fn default() -> MessageMetadata

Returns the “default value” for a type.

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

fn deserialize<__D>( __deserializer: __D, ) -> Result<MessageMetadata, <__D as Deserializer<'de>>::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 as Serializer>::Ok, <__S as Serializer>::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.