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use core::*;
use std::sync::Arc;
const DEFAULT_SEPARATOR: &'static str = ".";
#[derive(Debug, Clone)]
pub struct Namespace (Vec<String>);
impl Namespace {
pub fn subspace_of(self, parent: &Namespace) -> Self {
Namespace([parent.0.clone(), self.0].concat())
}
pub fn join(&self, separator: &str) -> String {
self.0.join(separator)
}
}
impl<'a> From<&'a str> for Namespace {
fn from(name: &'a str) -> Namespace {
Namespace(vec![name.to_string()])
}
}
impl From<String> for Namespace {
fn from(name: String) -> Namespace {
Namespace(vec![name])
}
}
impl<'a, 'b: 'a> From<&'b [&'a str]> for Namespace {
fn from(names: &'a [&'a str]) -> Namespace {
Namespace(names.iter().map(|n| n.to_string()).collect())
}
}
pub trait WithNamespace
where
Self: Sized,
{
fn with_prefix<AS: AsRef<str>>(&self, prefix: AS) -> Self {
self.with_namespace(&[prefix.as_ref()])
}
fn with_namespace(&self, names: &[&str]) -> Self {
self.with_name(names)
}
fn with_name<IN: Into<Namespace>>(&self, names: IN) -> Self;
}
impl<M: Send + Sync + Clone + 'static> WithNamespace for Chain<M> {
fn with_name<IN: Into<Namespace>>(&self, names: IN) -> Self {
let ninto = names.into();
self.mod_metric(|next| {
let nspace = ninto.join(DEFAULT_SEPARATOR);
Arc::new(move |kind, name, rate| {
let name = [nspace.as_ref(), name].join(DEFAULT_SEPARATOR);
(next)(kind, name.as_ref(), rate)
})
})
}
}
#[deprecated(since = "0.5.0",
note = "Use `with_name` instead, omitting any previously supplied separator.")]
pub fn prefix<M, IC>(prefix: &str, chain: IC) -> Chain<M>
where
M: Clone + Send + Sync + 'static,
IC: Into<Chain<M>>,
{
let chain = chain.into();
chain.mod_metric(|next| {
let prefix = prefix.to_string();
Arc::new(move |kind, name, rate| {
let name = [&prefix, name].concat();
(next)(kind, name.as_ref(), rate)
})
})
}