/**
 * 客户端缓存池，记录各用户的socket与相应的client.
 *
 * author: Sand Wen
 * since: 2016.11.19
 */
"use strict";

var log = require('../../util/log');

var clientCache = null;

class ClientCache {
    constructor(){
        this._clientsBySocket = new Map();
        this._clientsByUserId = new Map();
    }

    get clients(){
        return this._clientsByUserId;
    }

    addClient(client){
        this._clientsByUserId.set(client.userId, client);
        this._clientsBySocket.set(client.socket, client);

        //log.info('Current clients: ', this.clients);
    }

    removeByUserId(userId){
        var socket = this.findById(userId);

        this._clientsByUserId.delete(userId);
        this._clientsBySocket.delete(socket);
    }

    removeByUserSocket(socket){
        var userId = this.findBySocket(socket);

        this._clientsByUserId.delete(userId);
        this._clientsBySocket.delete(socket);
    }

    findById(userId){
        return this._clientsByUserId.get(userId);
    }

    findBySocket(socket){
        return this._clientsBySocket.get(socket);
    }

    static clientCache(){
        if(clientCache === null){
            clientCache = new ClientCache();
        }

        return clientCache;
    }
}

module.exports = ClientCache;