statman-meter

statman-meter is one of the metrics from the statman library. Loosely based upon codahale metric package, a meter provides count and average information over a period of time.

This can be used to instrument call that may be expensive:

• incoming web service calls
• outbound calls to a subsystem
• expensive algorithms

Install it!

Option 1: access directly

Install using npm:

npm install statman-meter

Reference in your app:

var Meter = require('statman-meter');
var meter = Meter('meter-name');

Option 2: access from statman

Install using npm:

npm install statman

Reference in your app:

var statman = require('statman');
var meter = statman.Meter('meter-name');

Use it!

Option 1: init, record values, read

var meter = new Meter('webservice-calls');
meter.record(2000); //record that a call occurred for 2000 milliseconds
meter.record(4000); //record that a call occurred for 4000 milliseconds
meter.count();      //reports that there have been 2 calls 
meter.getAverage(); //reports that the average call is taking 3000 milliseconds

Option 2: init, record stopwatch, read

var meter = new Meter('webservice-calls');
var stopwatch = new Stopwatch();
stopwatch.start();
..
stopwatch.stop();
meter.record(stopwatch); //record that a call occurred and gets value from stopwatch.read()
meter.count();      //reports number of calls
meter.getAverage(); //reports the average timing of the calls

For more info on stopwatch, see (statman-stopwatch)[https://github.com/jasonray/statman-stopwatch]

Option 3: init, start event, stop event

var meter = new Meter('webservice-calls');
var event = meter.startEvent();
..
var event = stop();
meter.count()       //reports number of calls
meter.getAverage(); //reports the average timing of the calls

Build it!

• Make sure that you have node and npm installed
• Clone source code to you local machine
• Setup dependencies: npm install
• run tests: npm test