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// Copyright 2007 The Closure Library Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS-IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
/**
* @fileoverview Definition the goog.debug.RelativeTimeProvider class.
*
*/
goog.provide('goog.debug.RelativeTimeProvider');
/**
* A simple object to keep track of a timestamp considered the start of
* something. The main use is for the logger system to maintain a start time
* that is occasionally reset. For example, in Gmail, we reset this relative
* time at the start of a user action so that timings are offset from the
* beginning of the action. This class also provides a singleton as the default
* behavior for most use cases is to share the same start time.
*
* @constructor
* @final
*/
goog.debug.RelativeTimeProvider = function() {
/**
* The start time.
* @type {number}
* @private
*/
this.relativeTimeStart_ = goog.now();
};
/**
* Default instance.
* @type {goog.debug.RelativeTimeProvider}
* @private
*/
goog.debug.RelativeTimeProvider.defaultInstance_ = null;
/**
* Sets the start time to the specified time.
* @param {number} timeStamp The start time.
*/
goog.debug.RelativeTimeProvider.prototype.set = function(timeStamp) {
this.relativeTimeStart_ = timeStamp;
};
/**
* Resets the start time to now.
*/
goog.debug.RelativeTimeProvider.prototype.reset = function() {
this.set(goog.now());
};
/**
* @return {number} The start time.
*/
goog.debug.RelativeTimeProvider.prototype.get = function() {
return this.relativeTimeStart_;
};
/**
* @return {goog.debug.RelativeTimeProvider} The default instance.
*/
goog.debug.RelativeTimeProvider.getDefaultInstance = function() {
if (!goog.debug.RelativeTimeProvider.defaultInstance_) {
goog.debug.RelativeTimeProvider.defaultInstance_ =
new goog.debug.RelativeTimeProvider();
}
return goog.debug.RelativeTimeProvider.defaultInstance_;
};
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