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644e7b131d
This implements the `DartDependencySetBuilder` completely in Dart instead of calling out to `sky_snapshot` (Linux/Mac) or `gen_snapshot` (Windows) and allows us to use the same code path on all supported host platforms. It also slightly reduces hot reload times on Linux from ~750ms to ~690ms for the unchanged flutter_gallery app and significantly reduces hot reload times on Windows from almost 1.5s to just slightly slower than on Linux. This change will also allow us to retire `sky_snapshot` completely in the future.
46 lines
1.5 KiB
Dart
46 lines
1.5 KiB
Dart
// Copyright 2016 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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import 'asset.dart';
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import 'base/file_system.dart';
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import 'dart/dependencies.dart';
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import 'globals.dart';
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class DependencyChecker {
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final DartDependencySetBuilder builder;
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final Set<String> _dependencies = new Set<String>();
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final AssetBundle assets;
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DependencyChecker(this.builder, this.assets);
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/// Returns [true] if any components have been modified after [threshold] or
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/// if it cannot be determined.
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bool check(DateTime threshold) {
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_dependencies.clear();
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// Build the set of Dart dependencies.
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try {
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_dependencies.addAll(builder.build());
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} catch (e, st) {
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printTrace('DependencyChecker: error determining .dart dependencies:\n$e\n$st');
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return true;
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}
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// TODO(johnmccutchan): Extract dependencies from the AssetBundle too.
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// Check all dependency modification times.
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for (String path in _dependencies) {
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final File file = fs.file(path);
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final FileStat stat = file.statSync();
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if (stat.type == FileSystemEntityType.NOT_FOUND) {
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printTrace('DependencyChecker: Error stating $path.');
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return true;
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}
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if (stat.modified.isAfter(threshold)) {
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printTrace('DependencyChecker: $path is newer than $threshold');
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return true;
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}
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}
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printTrace('DependencyChecker: nothing is modified after $threshold.');
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return false;
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}
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}
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