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/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
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 *
 * Software distributed under the License is distributed on an "AS IS" basis,
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 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Mozilla Firefox.
 *
 * The Initial Developer of the Original Code is
 * the Mozilla Foundation <http://www.mozilla.org>.
 * Portions created by the Initial Developer are Copyright (C) 2011
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Taras Glek <tglek@mozilla.com>
 *
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#include "nsISupports.idl"

[scriptable, uuid(5c9afdb5-0532-47f3-be31-79e13a6db642)]
interface nsITelemetry : nsISupports
{
  /*
   * 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 - 0:Exponential, 1: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.
   * 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 newExponentialHistogram(in ACString name, in PRInt32 min, in PRInt32 max, in PRUint32 bucket_count);

  /*
    Same as newExponentialHistogram, but for linear histograms
   */
  [implicit_jscontext]
  jsval newLinearHistogram(in ACString name, in PRInt32 min, in PRInt32 max, in PRUint32 bucket_count);
};