librato-node/lib/aggregator.js

A node.js client for Librato Metrics (http://metrics.librato.com/)

// Generated by CoffeeScript 1.12.7
(function() {
  var Aggregator, assert,
    slice = [].slice;

  assert = require('assert');

  Aggregator = (function() {
    function Aggregator() {
      this.cache = {};
    }

    Aggregator.prototype.flushTo = function(queue) {
      var key, name, obj, ref, ref1, results, source, state;
      ref = this.cache;
      results = [];
      for (key in ref) {
        state = ref[key];
        ref1 = key.split(';'), name = ref1[0], source = ref1[1];
        if (state.count > 1) {
          obj = state;
        } else {
          obj = {
            value: state.sum
          };
        }
        obj.name = name;
        if (source != null) {
          obj.source = source;
        }
        queue.push(obj);
        results.push(delete this.cache[key]);
      }
      return results;
    };

    Aggregator.prototype.measure = function(key, value) {
      var base;
      assert(value != null, 'value is required');
      if ((base = this.cache)[key] == null) {
        base[key] = {
          count: 0,
          sum: 0,
          min: value,
          max: value,
          sum_squares: 0
        };
      }
      this.cache[key].count++;
      this.cache[key].sum += value;
      this.cache[key].min = Math.min(this.cache[key].min, value);
      this.cache[key].max = Math.max(this.cache[key].max, value);
      return this.cache[key].sum_squares += Math.pow(value, 2);
    };

    Aggregator.prototype.timing = function(key, fn, cb) {
      var done, retval, start;
      assert(fn != null, 'function is required');
      start = process.hrtime();
      done = (function(_this) {
        return function() {
          var msec, ref, sec, usec;
          ref = process.hrtime(start), sec = ref[0], usec = ref[1];
          msec = (sec * 1000) + Math.max(usec / 1000 / 1000);
          return _this.measure(key, msec);
        };
      })(this);
      if (fn.length) {
        return fn(function() {
          var args;
          args = 1 <= arguments.length ? slice.call(arguments, 0) : [];
          done();
          return cb != null ? cb.apply(this, args) : void 0;
        });
      } else {
        retval = fn();
        done();
        return retval;
      }
    };

    return Aggregator;

  })();

  module.exports = Aggregator;

}).call(this);

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