| <!DOCTYPE html> |
| <!-- |
| Copyright (c) 2014 The Chromium Authors. All rights reserved. |
| Use of this source code is governed by a BSD-style license that can be |
| found in the LICENSE file. |
| --> |
| |
| <link rel="import" href="/tracing/base/base.html"> |
| <link rel="import" href="/tracing/base/base64.html"> |
| |
| <script> |
| 'use strict'; |
| |
| tr.exportTo('tr.b', function() { |
| var Base64 = tr.b.Base64; |
| |
| function computeUserTimingMarkName(groupName, functionName, opt_args) { |
| if (groupName === undefined) |
| throw new Error('getMeasureString should have group name'); |
| if (functionName === undefined) |
| throw new Error('getMeasureString should have function name'); |
| var userTimingMarkName = groupName + ':' + functionName; |
| if (opt_args !== undefined) { |
| userTimingMarkName += '/'; |
| userTimingMarkName += Base64.btoa(JSON.stringify(opt_args)); |
| } |
| return userTimingMarkName; |
| } |
| |
| function Timing() { |
| } |
| |
| Timing.nextMarkNumber = 0; |
| |
| Timing.mark = function(groupName, functionName, opt_args) { |
| if (tr.isHeadless) { |
| return { |
| end: function() {} |
| }; |
| } |
| var userTimingMarkName = computeUserTimingMarkName( |
| groupName, functionName, opt_args); |
| var markBeginName = 'tvcm.mark' + Timing.nextMarkNumber++; |
| var markEndName = 'tvcm.mark' + Timing.nextMarkNumber++; |
| window.performance.mark(markBeginName); |
| return { |
| end: function() { |
| window.performance.mark(markEndName); |
| window.performance.measure(userTimingMarkName, |
| markBeginName, |
| markEndName); |
| } |
| }; |
| }; |
| |
| Timing.wrap = function(groupName, callback, opt_args) { |
| if (groupName === undefined) |
| throw new Error('Timing.wrap should have group name'); |
| if (callback.name === '') |
| throw new Error('Anonymous function is not allowed'); |
| return Timing.wrapNamedFunction( |
| groupName, callback.name, callback, opt_args); |
| }; |
| |
| Timing.wrapNamedFunction = function(groupName, functionName, callback, |
| opt_args) { |
| function timedNamedFunction() { |
| var markedTime = Timing.mark(groupName, functionName, opt_args); |
| try { |
| callback.apply(this, arguments); |
| } finally { |
| markedTime.end(); |
| } |
| } |
| return timedNamedFunction; |
| }; |
| |
| function TimedNamedPromise(groupName, name, executor, opt_args) { |
| var markedTime = Timing.mark(groupName, name, opt_args); |
| var promise = new Promise(executor); |
| promise.then(function(result) { |
| markedTime.end(); |
| return result; |
| }, function(e) { |
| markedTime.end(); |
| throw e; |
| }); |
| return promise; |
| } |
| |
| return { |
| _computeUserTimingMarkName: computeUserTimingMarkName, // export for testing |
| TimedNamedPromise: TimedNamedPromise, |
| Timing: Timing |
| }; |
| }); |
| </script> |
