Remove TelemetryStopwatch module.

Tag #21

1 files changed, 0 insertions, 335 deletions

diff --git a/toolkit/components/telemetry/TelemetryStopwatch.jsm b/toolkit/components/telemetry/TelemetryStopwatch.jsm
deleted file mode 100644
index ab6c6eafb..000000000
--- a/toolkit/components/telemetry/TelemetryStopwatch.jsm
+++ /dev/null
@@ -1,335 +0,0 @@
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this file,
- * You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-const Cc = Components.classes;
-const Ci = Components.interfaces;
-const Cu = Components.utils;
-
-this.EXPORTED_SYMBOLS = ["TelemetryStopwatch"];
-
-Cu.import("resource://gre/modules/Log.jsm", this);
-var Telemetry = Cc["@mozilla.org/base/telemetry;1"]
-                  .getService(Ci.nsITelemetry);
-
-// Weak map does not allow using null objects as keys. These objects are used
-// as 'null' placeholders.
-const NULL_OBJECT = {};
-const NULL_KEY = {};
-
-/**
- * Timers is a variation of a Map used for storing information about running
- * Stopwatches. Timers has the following data structure:
- *
- * {
- *    "HISTOGRAM_NAME": WeakMap {
- *      Object || NULL_OBJECT: Map {
- *        "KEY" || NULL_KEY: startTime
- *        ...
- *      }
- *      ...
- *    }
- *    ...
- * }
- *
- *
- * @example
- * // Stores current time for a keyed histogram "PLAYING_WITH_CUTE_ANIMALS".
- * Timers.put("PLAYING_WITH_CUTE_ANIMALS", null, "CATS", Date.now());
- *
- * @example
- * // Returns information about a simple Stopwatch.
- * let startTime = Timers.get("PLAYING_WITH_CUTE_ANIMALS", null, "CATS");
- */
-let Timers = {
-  _timers: new Map(),
-
-  _validTypes: function(histogram, obj, key) {
-    let nonEmptyString = value => {
-      return typeof value === "string" && value !== "" && value.length > 0;
-    };
-    return  nonEmptyString(histogram) &&
-            typeof obj == "object" &&
-           (key === NULL_KEY || nonEmptyString(key));
-  },
-
-  get: function(histogram, obj, key) {
-    key = key === null ? NULL_KEY : key;
-    obj = obj || NULL_OBJECT;
-
-    if (!this.has(histogram, obj, key)) {
-      return null;
-    }
-
-    return this._timers.get(histogram).get(obj).get(key);
-  },
-
-  put: function(histogram, obj, key, startTime) {
-    key = key === null ? NULL_KEY : key;
-    obj = obj || NULL_OBJECT;
-
-    if (!this._validTypes(histogram, obj, key)) {
-      return false;
-    }
-
-    let objectMap = this._timers.get(histogram) || new WeakMap();
-    let keyedInfo = objectMap.get(obj) || new Map();
-    keyedInfo.set(key, startTime);
-    objectMap.set(obj, keyedInfo);
-    this._timers.set(histogram, objectMap);
-    return true;
-  },
-
-  has: function(histogram, obj, key) {
-    key = key === null ? NULL_KEY : key;
-    obj = obj || NULL_OBJECT;
-
-    return this._timers.has(histogram) &&
-      this._timers.get(histogram).has(obj) &&
-      this._timers.get(histogram).get(obj).has(key);
-  },
-
-  delete: function(histogram, obj, key) {
-    key = key === null ? NULL_KEY : key;
-    obj = obj || NULL_OBJECT;
-
-    if (!this.has(histogram, obj, key)) {
-      return false;
-    }
-    let objectMap = this._timers.get(histogram);
-    let keyedInfo = objectMap.get(obj);
-    if (keyedInfo.size > 1) {
-      keyedInfo.delete(key);
-      return true;
-    }
-    objectMap.delete(obj);
-    // NOTE:
-    // We never delete empty objecMaps from this._timers because there is no
-    // nice solution for tracking the number of objects in a WeakMap.
-    // WeakMap is not enumerable, so we can't deterministically say when it's
-    // empty. We accept that trade-off here, given that entries for short-lived
-    // objects will go away when they are no longer referenced
-    return true;
-  }
-};
-
-this.TelemetryStopwatch = {
-  /**
-   * Starts a timer associated with a telemetry histogram. The timer can be
-   * directly associated with a histogram, or with a pair of a histogram and
-   * an object.
-   *
-   * @param {String} aHistogram - a string which must be a valid histogram name.
-   *
-   * @param {Object} aObj - Optional parameter. If specified, the timer is
-   *                        associated with this object, meaning that multiple
-   *                        timers for the same histogram may be run
-   *                        concurrently, as long as they are associated with
-   *                        different objects.
-   *
-   * @returns {Boolean} True if the timer was successfully started, false
-   *                    otherwise. If a timer already exists, it can't be
-   *                    started again, and the existing one will be cleared in
-   *                    order to avoid measurements errors.
-   */
-  start: function(aHistogram, aObj) {
-    return TelemetryStopwatchImpl.start(aHistogram, aObj, null);
-  },
-
-  /**
-   * Deletes the timer associated with a telemetry histogram. The timer can be
-   * directly associated with a histogram, or with a pair of a histogram and
-   * an object. Important: Only use this method when a legitimate cancellation
-   * should be done.
-   *
-  * @param {String} aHistogram - a string which must be a valid histogram name.
-   *
-   * @param {Object} aObj - Optional parameter. If specified, the timer is
-   *                        associated with this object, meaning that multiple
-   *                        timers or a same histogram may be run concurrently,
-   *                        as long as they are associated with different
-   *                        objects.
-   *
-   * @returns {Boolean} True if the timer exist and it was cleared, False
-   *                   otherwise.
-   */
-  cancel: function(aHistogram, aObj) {
-    return TelemetryStopwatchImpl.cancel(aHistogram, aObj, null);
-  },
-
-  /**
-   * Returns the elapsed time for a particular stopwatch. Primarily for
-   * debugging purposes. Must be called prior to finish.
-   *
-   * @param {String} aHistogram - a string which must be a valid histogram name.
-   *                              If an invalid name is given, the function will
-   *                              throw.
-   *
-   * @param (Object) aObj - Optional parameter which associates the histogram
-   *                        timer with the given object.
-   *
-   * @returns {Integer} time in milliseconds or -1 if the stopwatch was not
-   *                   found.
-   */
-  timeElapsed: function(aHistogram, aObj) {
-    return TelemetryStopwatchImpl.timeElapsed(aHistogram, aObj, null);
-  },
-
-  /**
-   * Stops the timer associated with the given histogram (and object),
-   * calculates the time delta between start and finish, and adds the value
-   * to the histogram.
-   *
-   * @param {String} aHistogram - a string which must be a valid histogram name.
-   *
-   * @param {Object} aObj - Optional parameter which associates the histogram
-   *                        timer with the given object.
-   *
-   * @returns {Boolean} True if the timer was succesfully stopped and the data
-   *                    was added to the histogram, False otherwise.
-   */
-  finish: function(aHistogram, aObj) {
-    return TelemetryStopwatchImpl.finish(aHistogram, aObj, null);
-  },
-
-  /**
-   * Starts a timer associated with a keyed telemetry histogram. The timer can
-   * be directly associated with a histogram and its key. Similarly to
-   * @see{TelemetryStopwatch.stat} the histogram and its key can be associated
-   * with an object. Each key may have multiple associated objects and each
-   * object can be associated with multiple keys.
-   *
-   * @param {String} aHistogram - a string which must be a valid histogram name.
-   *
-   * @param {String} aKey - a string which must be a valid histgram key.
-   *
-   * @param {Object} aObj - Optional parameter. If specified, the timer is
-   *                        associated with this object, meaning that multiple
-   *                        timers for the same histogram may be run
-   *                        concurrently,as long as they are associated with
-   *                        different objects.
-   *
-   * @returns {Boolean} True if the timer was successfully started, false
-   *                    otherwise. If a timer already exists, it can't be
-   *                    started again, and the existing one will be cleared in
-   *                    order to avoid measurements errors.
-   */
-  startKeyed: function(aHistogram, aKey, aObj) {
-    return TelemetryStopwatchImpl.start(aHistogram, aObj, aKey);
-  },
-
-  /**
-   * Deletes the timer associated with a keyed histogram. Important: Only use
-   * this method when a legitimate cancellation should be done.
-   *
-   * @param {String} aHistogram - a string which must be a valid histogram name.
-   *
-   * @param {String} aKey - a string which must be a valid histgram key.
-   *
-   * @param {Object} aObj - Optional parameter. If specified, the timer
-   *                        associated with this object is deleted.
-   *
-   * @return {Boolean} True if the timer exist and it was cleared, False
-   *                   otherwise.
-   */
-  cancelKeyed: function(aHistogram, aKey, aObj) {
-    return TelemetryStopwatchImpl.cancel(aHistogram, aObj, aKey);
-  },
-
-  /**
-   * Returns the elapsed time for a particular stopwatch. Primarily for
-   * debugging purposes. Must be called prior to finish.
-   *
-   * @param {String} aHistogram - a string which must be a valid histogram name.
-   *
-   * @param {String} aKey - a string which must be a valid histgram key.
-   *
-   * @param {Object} aObj - Optional parameter. If specified, the timer
-   *                        associated with this object is used to calculate
-   *                        the elapsed time.
-   *
-   * @return {Integer} time in milliseconds or -1 if the stopwatch was not
-   *                   found.
-   */
-  timeElapsedKeyed: function(aHistogram, aKey, aObj) {
-    return TelemetryStopwatchImpl.timeElapsed(aHistogram, aObj, aKey);
-  },
-
-  /**
-   * Stops the timer associated with the given keyed histogram (and object),
-   * calculates the time delta between start and finish, and adds the value
-   * to the keyed histogram.
-   *
-   * @param {String} aHistogram - a string which must be a valid histogram name.
-   *
-   * @param {String} aKey - a string which must be a valid histgram key.
-   *
-   * @param {Object} aObj - optional parameter which associates the histogram
-   *                        timer with the given object.
-   *
-   * @returns {Boolean} True if the timer was succesfully stopped and the data
-   *                   was added to the histogram, False otherwise.
-   */
-  finishKeyed: function(aHistogram, aKey, aObj) {
-    return TelemetryStopwatchImpl.finish(aHistogram, aObj, aKey);
-  }
-};
-
-this.TelemetryStopwatchImpl = {
-  start: function(histogram, object, key) {
-    if (Timers.has(histogram, object, key)) {
-      Timers.delete(histogram, object, key);
-      Cu.reportError(`TelemetryStopwatch: key "${histogram}" was already ` +
-                     "initialized");
-      return false;
-    }
-
-    return Timers.put(histogram, object, key, Components.utils.now());
-  },
-
-  cancel: function (histogram, object, key) {
-    return Timers.delete(histogram, object, key);
-  },
-
-  timeElapsed: function(histogram, object, key) {
-    let startTime = Timers.get(histogram, object, key);
-    if (startTime === null) {
-      Cu.reportError("TelemetryStopwatch: requesting elapsed time for " +
-                     `nonexisting stopwatch. Histogram: "${histogram}", ` +
-                     `key: "${key}"`);
-      return -1;
-    }
-
-    try {
-      let delta = Components.utils.now() - startTime
-      return Math.round(delta);
-    } catch (e) {
-      Cu.reportError("TelemetryStopwatch: failed to calculate elapsed time " +
-                     `for Histogram: "${histogram}", key: "${key}", ` +
-                     `exception: ${Log.exceptionStr(e)}`);
-      return -1;
-    }
-  },
-
-  finish: function(histogram, object, key) {
-    let delta = this.timeElapsed(histogram, object, key);
-    if (delta == -1) {
-      return false;
-    }
-
-    try {
-      if (key) {
-        Telemetry.getKeyedHistogramById(histogram).add(key, delta);
-      } else {
-        Telemetry.getHistogramById(histogram).add(delta);
-      }
-    } catch (e) {
-      Cu.reportError("TelemetryStopwatch: failed to update the Histogram " +
-                     `"${histogram}", using key: "${key}", ` +
-                     `exception: ${Log.exceptionStr(e)}`);
-      return false;
-    }
-
-    return Timers.delete(histogram, object, key);
-  }
-}