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/* 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,
*/
typedef DOMString HistogramID;
typedef DOMString HistogramKey;
[ChromeOnly, Exposed=Window]
namespace 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 histogram - a string which must be a valid histogram name.
*
* @param obj - 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.
* @param [options.inSeconds=false] - record elapsed time for this
* histogram in seconds instead of milliseconds. Defaults to
* false.
*
* @returns 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.
*/
boolean start(HistogramID histogram, optional object? obj = null,
optional TelemetryStopwatchOptions options = {});
/**
* Returns whether a timer associated with a telemetry histogram is currently
* running. The timer can be directly associated with a histogram, or with a
* pair of a histogram and an object.
*
* @param histogram - a string which must be a valid histogram name.
*
* @param obj - 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 True if the timer exists and is currently running.
*/
boolean running(HistogramID histogram, optional object? obj = 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 histogram - a string which must be a valid histogram name.
*
* @param obj - 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 True if the timer exist and it was cleared, False
* otherwise.
*/
boolean cancel(HistogramID histogram, optional object? obj = null);
/**
* Returns the elapsed time for a particular stopwatch. Primarily for
* debugging purposes. Must be called prior to finish.
*
* @param histogram - a string which must be a valid histogram name.
* if an invalid name is given, the function will
* throw.
*
* @param obj - Optional parameter which associates the histogram
* timer with the given object.
*
* @param canceledOkay - Optional parameter which will suppress any
* warnings that normally fire when a stopwatch
* is finished after being cancelled. Defaults
* to false.
*
* @returns Time in milliseconds or -1 if the stopwatch was not
* found.
*/
long timeElapsed(HistogramID histogram,
optional object? obj = null,
optional boolean canceledOkay = false);
/**
* 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 histogram - a string which must be a valid histogram name.
*
* @param obj - Optional parameter which associates the histogram
* timer with the given object.
*
* @param canceledOkay - Optional parameter which will suppress any
* warnings that normally fire when a stopwatch
* is finished after being cancelled. Defaults
* to false.
*
* @returns True if the timer was succesfully stopped and the data
* was added to the histogram, false otherwise.
*/
boolean finish(HistogramID histogram,
optional object? obj = null,
optional boolean canceledOkay = false);
/**
* 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.start} 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 histogram - a string which must be a valid histogram name.
*
* @param key - a string which must be a valid histgram key.
*
* @param obj - 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.
* @param [options.inSeconds=false] - record elapsed time for this
* histogram in seconds instead of milliseconds. Defaults to
* false.
*
* @returns 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.
*/
boolean startKeyed(HistogramID histogram, HistogramKey key,
optional object? obj = null,
optional TelemetryStopwatchOptions options = {});
/**
* Returns whether a timer associated with a telemetry histogram is currently
* running. Similarly to @see{TelemetryStopwatch.running} the timer 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 histogram - a string which must be a valid histogram name.
*
* @param key - a string which must be a valid histgram key.
*
* @param obj - 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 True if the timer exists and is currently running.
*/
boolean runningKeyed(HistogramID histogram, HistogramKey key,
optional object? obj = null);
/**
* Deletes the timer associated with a keyed histogram. Important: Only use
* this method when a legitimate cancellation should be done.
*
* @param histogram - a string which must be a valid histogram name.
*
* @param key - a string which must be a valid histgram key.
*
* @param obj - Optional parameter. If specified, the timer
* associated with this object is deleted.
*
* @returns True if the timer exist and it was cleared, False
* otherwise.
*/
boolean cancelKeyed(HistogramID histogram, HistogramKey key,
optional object? obj = null);
/**
* Returns the elapsed time for a particular stopwatch. Primarily for
* debugging purposes. Cannot be called after finish().
*
* @param histogram - a string which must be a valid histogram name.
*
* @param key - a string which must be a valid histgram key.
*
* @param obj - Optional parameter. If specified, the timer
* associated with this object is used to calculate
* the elapsed time.
*
* @returns Time in milliseconds or -1 if the stopwatch was not
* found.
*/
long timeElapsedKeyed(HistogramID histogram, HistogramKey key,
optional object? obj = null,
optional boolean canceledOkay = false);
/**
* 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 histogram - a string which must be a valid histogram name.
*
* @param key - a string which must be a valid histgram key.
*
* @param obj - optional parameter which associates the histogram
* timer with the given object.
*
* @param canceledOkay - Optional parameter which will suppress any
* warnings that normally fire when a stopwatch
* is finished after being cancelled. Defaults
* to false.
*
* @returns True if the timer was succesfully stopped and the data
* was added to the histogram, false otherwise.
*/
boolean finishKeyed(HistogramID histogram, HistogramKey key,
optional object? obj = null,
optional boolean canceledOkay = false);
/**
* Set the testing mode. Used by tests.
*/
undefined setTestModeEnabled(optional boolean testing = true);
};
dictionary TelemetryStopwatchOptions {
/**
* If true, record elapsed time for this histogram in seconds instead of
* milliseconds.
*/
boolean inSeconds = false;
};