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Unified Diff: pkg/stack_trace/lib/src/lazy_trace.dart

Issue 14647003: Be lazier when capturing stack traces. (Closed) Base URL: https://dart.googlecode.com/svn/branches/bleeding_edge/dart
Patch Set: Created 7 years, 8 months ago
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Index: pkg/stack_trace/lib/src/lazy_trace.dart
diff --git a/pkg/stack_trace/lib/src/lazy_trace.dart b/pkg/stack_trace/lib/src/lazy_trace.dart
new file mode 100644
index 0000000000000000000000000000000000000000..8c4482971bd6a3b4690df51e8a6b4e7975ca2d3d
--- /dev/null
+++ b/pkg/stack_trace/lib/src/lazy_trace.dart
@@ -0,0 +1,34 @@
+// Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+library lazy_trace;
+
+import 'frame.dart';
+import 'trace.dart';
+
+/// A thunk for lazily constructing a [Trace].
+typedef Trace TraceThunk();
+
+/// A wrapper around a [TraceThunk]. This works around issue 9579 by avoiding
+/// the conversion of native [StackTrace]s to strings until it's absolutely
+/// necessary.
+class LazyTrace implements Trace {
+ final TraceThunk _thunk;
+ Trace _inner;
+
+ LazyTrace(this._thunk);
+
+ Trace get _trace {
+ if (_inner == null) _inner = _thunk();
+ return _inner;
+ }
+
+ List<Frame> get frames => _trace.frames;
+ String get stackTrace => _trace.stackTrace;
+ String get fullStackTrace => _trace.fullStackTrace;
+ Trace get terse => new LazyTrace(() => _trace.terse);
+ Trace foldFrames(bool predicate(frame)) =>
+ new LazyTrace(() => _trace.foldFrames(predicate));
+ String toString() => _trace.toString();
+}
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