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node-task/node_modules/mysql2/lib/commands/ping.js

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2014-09-24 17:56:53 -04:00
var Command = require('./command');
var util = require('util');
var CommandCode = require('../constants/commands');
var Packet = require('../packets/packet');
// TODO: time statistics?
// usefull for queue size and network latency monitoring
// store created,sent,reply timestamps
function Ping(callback)
{
Command.call(this);
this.onResult = callback;
}
util.inherits(Ping, Command);
Ping.prototype.start = function(packet, connection) {
var ping = new Packet(0, new Buffer([0, 0, 0, 0, CommandCode.PING]));
connection.writePacket(ping);
return Ping.prototype.pingResponse;
};
Ping.prototype.pingResponse = function(packet) {
// TODO: check it's OK packet. error check already done in caller
if (this.onResult)
process.nextTick(this.onResult.bind(this));
return null;
};
module.exports = Ping;