domotz-remote-pawn/src/discovery/nmap/cache.js

Domotz Agent

/** This file is part of Domotz Agent.
  * Copyright (C) 2016  Domotz Ltd
  *
  * Domotz Agent is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 3 of the License, or
  * (at your option) any later version.
  *
  * Domotz Agent is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with Domotz Agent.  If not, see <http://www.gnu.org/licenses/>.
  **/
/**
 * Created by tom on 23/09/15.
 */

var nmapDiscoveryCache = function(configuration) {

    var discovery = configuration.discovery;

    var expirationDate = discovery ? discovery.refresh : 30;
    var buffer, date;

    function refresh() {
        buffer = [];
        date = 0;
        console.debug('Refresh Nmap Cache. Expired in %s get request.', expirationDate);
    }

    refresh();

    return {
        get: function() {
            var b = buffer;
            date++;
            if (date === expirationDate) {
                refresh();
            }
            return b;
        },
        set: function(b) {
            buffer = b;
        },
        push: function (dev) {
            console.debug('Push dev into Cache: ' + JSON.stringify(dev));
            buffer.push(dev);
        }
    };
};

module.exports.factory = nmapDiscoveryCache;