Struct MessageMetadata 

pub struct MessageMetadata {
    pub id: Option<MessageId>,
    pub correlation_id: Option<String>,
    pub reply_to: Option<QueueName>,
    pub content_type: Option<String>,
    pub timestamp: Option<u64>,
    pub priority: Option<u8>,
    pub expiration: Option<u64>,
    pub headers: HashMap<String, String>,
}

消息元数据

Fields

id: Option<MessageId>

消息 ID

correlation_id: Option<String>

关联 ID (用于消息关联)

reply_to: Option<QueueName>

回复队列

content_type: Option<String>

内容类型

timestamp: Option<u64>

时间戳

priority: Option<u8>

优先级 (0-9)

expiration: Option<u64>

过期时间 (毫秒)

headers: HashMap<String, String>

自定义头信息

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() -> MessageMetadata

Returns the “default value” for a type.