net-pool 0.5.1

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

/// 普通hash策略

pub struct HashStrategy(RwLock<super::backends::BackendStates>);

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

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

impl super::Strategy for HashStrategy {
    fn contain(&self, addr: &Address) -> bool {
        let g = self.0.read().unwrap();
        g.contain(addr)
    }

    fn add_backend(&self, id: Option<u32>, addr: Address) {
        let mut g = self.0.write().unwrap();
        g.add(id, addr);
    }

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

    fn get_backend(&self, key: &str) -> Option<BackendState> {
        let code = bytes_to_hash_code(key.as_bytes());
        let g = self.0.read().unwrap();
        let n = (code % g.get_all().len() as u64) as usize;
        g.nth(n).map(|bs| bs.clone())
    }

    fn get_backend_by_id(&self, id: u32) -> Option<BackendState> {
        let g = self.0.read().unwrap();
        g.get_by_id(id).map(|bs| bs.clone())
    }

    fn get_backend_by_code(&self, code: u64) -> Option<BackendState> {
        let g = self.0.read().unwrap();
        g.get_by_code(code).map(|bs| bs.clone())
    }

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