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use std::collections::HashMap;
use std::fmt::Debug;
use async_trait::async_trait;
use dashmap::DashMap;
use crate::raw::adapters::kv;
use crate::raw::*;
use crate::*;
#[derive(Default)]
pub struct DashmapBuilder {}
impl Builder for DashmapBuilder {
const SCHEME: Scheme = Scheme::Dashmap;
type Accessor = DashmapBackend;
fn from_map(_: HashMap<String, String>) -> Self {
Self::default()
}
fn build(&mut self) -> Result<Self::Accessor> {
Ok(DashmapBackend::new(Adapter {
inner: DashMap::default(),
}))
}
}
pub type DashmapBackend = kv::Backend<Adapter>;
#[derive(Debug, Clone)]
pub struct Adapter {
inner: DashMap<String, Vec<u8>>,
}
#[async_trait]
impl kv::Adapter for Adapter {
fn metadata(&self) -> kv::Metadata {
kv::Metadata::new(
Scheme::Dashmap,
&format!("{:?}", &self.inner as *const _),
AccessorCapability::Read | AccessorCapability::Write | AccessorCapability::Scan,
)
}
async fn get(&self, path: &str) -> Result<Option<Vec<u8>>> {
self.blocking_get(path)
}
fn blocking_get(&self, path: &str) -> Result<Option<Vec<u8>>> {
match self.inner.get(path) {
None => Ok(None),
Some(bs) => Ok(Some(bs.to_vec())),
}
}
async fn set(&self, path: &str, value: &[u8]) -> Result<()> {
self.blocking_set(path, value)
}
fn blocking_set(&self, path: &str, value: &[u8]) -> Result<()> {
self.inner.insert(path.to_string(), value.to_vec());
Ok(())
}
async fn delete(&self, path: &str) -> Result<()> {
self.blocking_delete(path)
}
fn blocking_delete(&self, path: &str) -> Result<()> {
self.inner.remove(path);
Ok(())
}
async fn scan(&self, path: &str) -> Result<Vec<String>> {
self.blocking_scan(path)
}
fn blocking_scan(&self, path: &str) -> Result<Vec<String>> {
let keys = self.inner.iter().map(|kv| kv.key().to_string());
if path.is_empty() {
Ok(keys.collect())
} else {
Ok(keys.filter(|k| k.starts_with(path)).collect())
}
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_accessor_metadata_name() {
let b1 = DashmapBuilder::default().build().unwrap();
assert_eq!(b1.info().name(), b1.info().name());
let b2 = DashmapBuilder::default().build().unwrap();
assert_ne!(b1.info().name(), b2.info().name())
}
}