hubs/src/index.js

``` Caryl ------ courier3 / \ / \ courier1 courier2

const Courier = require('./courier')
const protocol = require('./protocol')
const defaultProtocols = require('./defaultProtocols')

/**
 *  Courier Hubs
 * 
 * @class Hubs
 */
class Hubs{
    constructor(){ 
        this.globelPlugin = []
        this.protocol = protocol
        this._registerDefaultProtocol()
    }

    createCourier(reqItems){
        var courier =  new Courier(reqItems, this.protocol)
        this._applyAllPlugin(courier)
        return courier
    }

    _applyAllPlugin(courier){
        this.globelPlugin.forEach(plugin=>courier.applyPlugin(plugin))
    }

    /**
     * apply plugin that affect all courier 
     * 
     * @param {any} plugin 
     * 
     * @memberof Caryl
     */
    applyPlugin(plugin){
        this.globelPlugin.push(plugin)
    }

    registerProtocol(config){
        this.protocol.registerRequestor(config)
    }

    _registerDefaultProtocol(){
        defaultProtocols.forEach(p=>this.registerProtocol(p))
    }
}




module.exports = Hubs