package com.zy.core.netty.cache;

import io.netty.channel.Channel;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.annotation.RestController;

import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

/**
 * Channel缓存 ==>> {
 *                   key: uuid
 *                   value: Channel
 *                 }
 * Created by vincent on 2019-04-02
 */
@Slf4j
@RestController
public class ChannelCache {

    private static Map<String, Channel> channelGroup = new ConcurrentHashMap<>();

    public static void setChannel(String uuid, Channel channel){
        // todo 缓存标记 ===>> 分布式系统
//        String hostName = SystemProperties.HOST_NAME;
        if (getChannel(uuid) == channel){
            return;
        }
        removeChannel(uuid);
        channelGroup.put(uuid, channel);
    }

    public static Channel getChannel(String uuid){
        return channelGroup.get(uuid);
    }

    public static void removeChannel(String uuid) {
        Channel channel = getChannel(uuid);
        if (null == channel){
            return;
        }
        channelGroup.remove(uuid);
        channel.close();
    }

    public static String removeChannel(Channel channel){
        String key = null;
        for (Map.Entry<String, Channel> entry : channelGroup.entrySet()){
            if (entry.getValue() == channel){
                key = entry.getKey();
                break;
            }
        }
        if (null != key){
            channelGroup.remove(key);
            return key;
        }
        return null;
    }



}