rocketmq-remoting 0.9.0

Rust implementation of Apache rocketmq remoting
Documentation 
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use std::collections::HashMap;

use cheetah_string::CheetahString;
use serde::Deserialize;
use serde::Serialize;

use crate::protocol::command_custom_header::CommandCustomHeader;
#[derive(Debug, Default, Clone, PartialEq, Eq, Serialize, Deserialize)]
pub struct EmptyHeader {}

impl CommandCustomHeader for EmptyHeader {
    fn to_map(&self) -> Option<HashMap<CheetahString, CheetahString>> {
        None
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use serde_json;

    #[test]
    fn test_empty_header_lifecycle() {
        let header = EmptyHeader::default();

        let cloned = header.clone();
        assert_eq!(header, cloned);

        let json = serde_json::to_string(&header).unwrap();
        assert_eq!(json, "{}");
        let de: EmptyHeader = serde_json::from_str(&json).unwrap();
        assert_eq!(header, de);
        assert!(header.to_map().is_none());

        assert!(format!("{:?}", header).contains("EmptyHeader"));
    }
}