// Copyright 2014 The Flutter Authors. All rights reserved. // Use of this source code is governed by a BSD-style license that can be // found in the LICENSE file. /// Timeline data recorded by the Flutter runtime. class Timeline { /// Creates a timeline given JSON-encoded timeline data. /// /// [json] is in the `chrome://tracing` format. It can be saved to a file /// and loaded in Chrome for visual inspection. /// /// See https://docs.google.com/document/d/1CvAClvFfyA5R-PhYUmn5OOQtYMH4h6I0nSsKchNAySU/preview factory Timeline.fromJson(Map<String, dynamic> json) { return Timeline._(json, _parseEvents(json)); } Timeline._(this.json, this.events); /// The original timeline JSON. final Map<String, dynamic> json; /// List of all timeline events. final List<TimelineEvent> events; } /// A single timeline event. class TimelineEvent { /// Creates a timeline event given JSON-encoded event data. factory TimelineEvent(Map<String, dynamic> json) { return TimelineEvent._( json, json['name'] as String, json['cat'] as String, json['ph'] as String, json['pid'] as int, json['tid'] as int, json['dur'] != null ? Duration(microseconds: json['dur'] as int) : null, json['tdur'] != null ? Duration(microseconds: json['tdur'] as int) : null, json['ts'] as int, json['tts'] as int, json['args'] as Map<String, dynamic>, ); } TimelineEvent._( this.json, this.name, this.category, this.phase, this.processId, this.threadId, this.duration, this.threadDuration, this.timestampMicros, this.threadTimestampMicros, this.arguments, ); /// The original event JSON. final Map<String, dynamic> json; /// The name of the event. /// /// Corresponds to the "name" field in the JSON event. final String name; /// Event category. Events with different names may share the same category. /// /// Corresponds to the "cat" field in the JSON event. final String category; /// For a given long lasting event, denotes the phase of the event, such as /// "B" for "event began", and "E" for "event ended". /// /// Corresponds to the "ph" field in the JSON event. final String phase; /// ID of process that emitted the event. /// /// Corresponds to the "pid" field in the JSON event. final int processId; /// ID of thread that issues the event. /// /// Corresponds to the "tid" field in the JSON event. final int threadId; /// The duration of the event. /// /// Note, some events are reported with duration. Others are reported as a /// pair of begin/end events. /// /// Corresponds to the "dur" field in the JSON event. final Duration duration; /// The thread duration of the event. /// /// Note, some events are reported with duration. Others are reported as a /// pair of begin/end events. /// /// Corresponds to the "tdur" field in the JSON event. final Duration threadDuration; /// Time passed since tracing was enabled, in microseconds. /// /// Corresponds to the "ts" field in the JSON event. final int timestampMicros; /// Thread clock time, in microseconds. /// /// Corresponds to the "tts" field in the JSON event. final int threadTimestampMicros; /// Arbitrary data attached to the event. /// /// Corresponds to the "args" field in the JSON event. final Map<String, dynamic> arguments; } List<TimelineEvent> _parseEvents(Map<String, dynamic> json) { final List<dynamic> jsonEvents = json['traceEvents'] as List<dynamic>; if (jsonEvents == null) return null; // TODO(vegorov): use instance method version of castFrom when it is available. return Iterable.castFrom<dynamic, Map<String, dynamic>>(jsonEvents) .map<TimelineEvent>((Map<String, dynamic> eventJson) => TimelineEvent(eventJson)) .toList(); }