strev 0.5.0

Event-driven pub/sub messaging library with compile-time ack safety
Documentation 
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use std::collections::HashMap;

#[derive(Clone, Debug, Default, PartialEq, Eq)]
pub struct Metadata(HashMap<String, String>);

impl Metadata {
    pub fn new() -> Self {
        Self(HashMap::new())
    }

    pub fn get(&self, key: &str) -> Option<&str> {
        self.0.get(key).map(|v| v.as_str())
    }

    pub fn set(&mut self, key: impl Into<String>, value: impl Into<String>) {
        self.0.insert(key.into(), value.into());
    }

    pub fn remove(&mut self, key: &str) -> Option<String> {
        self.0.remove(key)
    }

    pub fn iter(&self) -> impl Iterator<Item = (&str, &str)> {
        self.0.iter().map(|(k, v)| (k.as_str(), v.as_str()))
    }

    pub fn is_empty(&self) -> bool {
        self.0.is_empty()
    }

    pub fn len(&self) -> usize {
        self.0.len()
    }
}