hp-log 0.3.1

try to implement high performance log :w
Documentation 
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use std::collections::LinkedList;
use std::sync::{Arc, Mutex, Condvar};
use std::sync::atomic::{AtomicBool, Ordering};

use crate::appender::Appender;
use crate::event::LogicEvent;

pub struct Writer {
    inner: Arc<Inner>,
    event_cache: LinkedList<LogicEvent>,
    appenders: Vec<Box<Appender>>,
}

pub struct Inner {
    cond: Condvar,
    exit: AtomicBool,
    events: Mutex<LinkedList<LogicEvent>>,
}

pub struct Poster {
    inner: Arc<Inner>,
}

impl Inner {
    fn new() -> Self {
        Inner {
            exit: AtomicBool::new(false),
            cond: Condvar::new(),
            events: Mutex::new(LinkedList::new()),
        }
    }

    fn insert_log(&self, log: LogicEvent) {
        let mut lock = self.events.lock().unwrap(); 
        lock.push_back(log);
        self.cond.notify_one();
    }

    fn set_terminate(&self, is_terminate: bool) {
        self.exit.store(is_terminate, Ordering::Release);
        self.cond.notify_one();
    }

    fn is_terminate(&self) -> bool {
        self.exit.load(Ordering::Acquire)
    }
}

impl Poster {
    #[allow(dead_code)]
    pub fn new(inner: Arc<Inner>) -> Poster {
        Poster {
            inner
        }
    }

    pub fn insert_log(&self, log: LogicEvent) {
        self.inner.insert_log(log);
    }

    pub fn set_terminate(&self, val: bool) {
        self.inner.set_terminate(val);
    }
}

impl Writer {
    pub fn new() -> Self {
        Writer {
            inner: Arc::new(Inner::new()),
            event_cache: LinkedList::new(),
            appenders: Vec::new(),
        }
    }

    pub fn get_poster(&self) -> Poster {
        Poster {
            inner: self.inner.clone(),
        }
    }

    #[allow(dead_code)]
    pub fn add_appender(&mut self, appender: Box<Appender>) {
        self.appenders.push(appender);
    }

    #[allow(dead_code)]
    pub fn insert_log(&self, log: LogicEvent) {
        self.inner.insert_log(log);
    }
    
    pub fn fetch_logs(&mut self) {
        {
            let mut lock = self.inner.events.lock().unwrap(); 
            while lock.is_empty() {
                lock = self.inner.cond.wait(lock).unwrap();
            }

            self.event_cache.append(&mut lock);
            //println!("append logs, cache size: {}", self.event_cache.len());
        }

        while !self.event_cache.is_empty() {
            match self.event_cache.pop_front() {
                Some(log) => {
                    for app in self.appenders.iter_mut() {
                        app.append(&log, self.event_cache.is_empty());
                    }
                },
                None => {
                    println!("Error cache empty!");
                    break;
                }
            }
        }
    }

    pub fn is_terminate(&self) -> bool {
        if self.inner.is_terminate() && self.event_cache.is_empty() {
            let lock = self.inner.events.lock().unwrap(); 
            if lock.is_empty() {
                return true;
            }
        }

        false
    }
}