gecko/toolkit/components/telemetry/nsITelemetry.idl

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 * The contents of this file are subject to the Mozilla Public License Version
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 * The Original Code is Mozilla Firefox.
 *
 * The Initial Developer of the Original Code is
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 * Portions created by the Initial Developer are Copyright (C) 2011
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 * Contributor(s):
 *   Taras Glek <tglek@mozilla.com>
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#include "nsISupports.idl"

[scriptable, uuid(db854295-478d-4de9-8211-d73ed7d81cd0)]
interface nsITelemetry : nsISupports
{
  /**
   * Histogram types:
   * HISTOGRAM_EXPONENTIAL - buckets increase exponentially
   * HISTOGRAM_LINEAR - buckets increase linearly
   * HISTOGRAM_BOOLEAN - For storing 0/1 values
   */
  const unsigned long HISTOGRAM_EXPONENTIAL = 0;
  const unsigned long HISTOGRAM_LINEAR = 1;
  const unsigned long HISTOGRAM_BOOLEAN = 2;

  /*
   * An object containing a snapshot from all of the currently registered histograms.
   * { name1: {data1}, name2:{data2}...}
   * where data is consists of the following properties:
   *   min - Minimal bucket size
   *   max - Maximum bucket size
   *   histogram_type - HISTOGRAM_EXPONENTIAL or HISTOGRAM_LINEAR
   *   counts - array representing contents of the buckets in the histogram
   *   ranges -  an array with calculated bucket sizes
   *   sum - sum of the bucket contents
   */
  [implicit_jscontext]
  readonly attribute jsval histogramSnapshots;

  /** 
   * Create and return a histogram where bucket sizes increase exponentially. Parameters:
   *
   * @param name Unique histogram name
   * @param min - Minimal bucket size
   * @param max - Maximum bucket size
   * @param bucket_count - number of buckets in the histogram.
   * @param type - HISTOGRAM_EXPONENTIAL or HISTOGRAM_LINEAR
   * The returned object has the following functions:
   *   add(int) - Adds an int value to the appropriate bucket
   *   snapshot() - Returns a snapshot of the histogram with the same data fields as in histogramSnapshots()
   */
  [implicit_jscontext]
  jsval newHistogram(in ACString name, in PRUint32 min, in PRUint32 max, in PRUint32 bucket_count, in unsigned long histogram_type);

  /**
   * Same as newHistogram above, but for histograms registered in TelemetryHistograms.h.
   *
   * @param id - unique identifier from TelemetryHistograms.h
   */
  [implicit_jscontext]
  jsval getHistogramById(in ACString id);
};