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// Copyright 2017 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.
import 'dart:convert' show json;
import 'package:meta/meta.dart';
/// This class knows how to format benchmark results for machine and human
/// consumption.
///
/// Example:
///
/// BenchmarkResultPrinter printer = new BenchmarkResultPrinter();
/// printer.add(
/// description: 'Average frame time',
/// value: averageFrameTime,
/// unit: 'ms',
/// name: 'average_frame_time',
/// );
/// printer.printToStdout();
///
class BenchmarkResultPrinter {
final List<_BenchmarkResult> _results = <_BenchmarkResult>[];
/// Adds a benchmark result to the list of results.
///
/// [description] is a human-readable description of the result. [value] is a
/// result value. [unit] is the unit of measurement, such as "ms", "km", "h".
/// [name] is a computer-readable name of the result used as a key in the JSON
/// serialization of the results.
void addResult({ @required String description, @required double value, @required String unit, @required String name }) {
_results.add(new _BenchmarkResult(description, value, unit, name));
}
/// Prints the results added via [addResult] to standard output, once as JSON
/// for computer consumption and once formatted as plain text for humans.
void printToStdout() {
// IMPORTANT: keep these values in sync with dev/devicelab/bin/tasks/microbenchmarks.dart
const String jsonStart = '================ RESULTS ================';
const String jsonEnd = '================ FORMATTED ==============';
const String jsonPrefix = ':::JSON:::';
print(jsonStart);
print('$jsonPrefix ${_printJson()}');
print(jsonEnd);
print(_printPlainText());
}
String _printJson() {
final Map<String, double> results = <String, double>{};
for (_BenchmarkResult result in _results) {
results[result.name] = result.value;
}
return json.encode(results);
}
String _printPlainText() {
final StringBuffer buf = new StringBuffer();
for (_BenchmarkResult result in _results) {
buf.writeln('${result.description}: ${result.value.toStringAsFixed(1)} ${result.unit}');
}
return buf.toString();
}
}
class _BenchmarkResult {
_BenchmarkResult(this.description, this.value, this.unit, this.name);
/// Human-readable description of the result, e.g. "Average frame time".
final String description;
/// Result value that in agreement with [unit].
final double value;
/// Unit of measurement that is in agreement with [value].
final String unit;
/// Computer-readable name of the result.
final String name;
}