net-pool 0.2.0

A set of types for network connection pool.
Documentation 
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use crate::backend::{Address, BackendState, BackendStates};
use crate::utils::bytes_to_hash_code;
use std::sync::RwLock;

/// 普通hash策略

pub struct HashStrategy(RwLock<BackendStates>);

impl HashStrategy {
    pub fn new() -> Self {
        HashStrategy::default()
    }
}

impl Default for HashStrategy {
    fn default() -> Self {
        HashStrategy(RwLock::new(BackendStates::new()))
    }
}

impl super::LbStrategy for HashStrategy {
    fn strategy(&self) -> super::Strategy {
        super::Strategy::Hash
    }

    fn contain(&self, addr: &Address) -> bool {
        let g = self.0.read().unwrap();
        g.get_backend(addr).is_some()
    }

    fn add_backend(&self, addr: Address) {
        let mut g = self.0.write().unwrap();
        g.add_backend(addr)
    }

    fn remove_backend(&self, addr: &Address) -> bool {
        let mut g = self.0.write().unwrap();
        g.remove_backend(&addr)
    }

    fn get_backend(&self, key: &str) -> Option<BackendState> {
        let g = self.0.read().unwrap();
        let bss = g.get_backends();
        if bss.is_empty() {
            return None;
        }

        let code = bytes_to_hash_code(key.as_bytes());
        let idx = code % bss.len() as u64;
        Some(bss[idx as usize].clone())
    }

    fn get_backends(&self) -> Vec<BackendState> {
        let g = self.0.read().unwrap();
        let bss = g.get_backends();
        bss.iter().map(|bs| bs.clone()).collect()
    }
}