| // Copyright (c) 2024, 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. |
| |
| import 'package:async_helper/async_helper.dart'; |
| import 'package:expect/expect.dart'; |
| import 'package:expect/config.dart'; |
| |
| final invalidObjects = [true, 1, 1.2, 'a']; |
| |
| main() async { |
| testFinalizerAttachDetachArgumentValidation(); |
| |
| // This test doesn't work reliably on the web yet as it's hard to trigger GC |
| // that will run finalizer and weak reference processing. |
| if (isVmConfiguration) { |
| asyncStart(); |
| await testFinalizerInvocation(); |
| asyncEnd(); |
| } |
| } |
| |
| void testFinalizerAttachDetachArgumentValidation() { |
| final finalizer = Finalizer<Foo?>((Foo? foo) {}); |
| final foo = Foo(); |
| |
| // Tests invalid arguments. |
| for (final invalid in invalidObjects) { |
| // Test invalid targets. |
| Expect.throws(() => finalizer.attach(invalid, foo)); |
| Expect.throws(() => finalizer.attach(invalid, null)); |
| Expect.throws(() => finalizer.attach(invalid, foo, detach: foo)); |
| Expect.throws(() => finalizer.attach(invalid, null, detach: null)); |
| |
| // Test invalid detach tokens. |
| Expect.throws(() => finalizer.attach(foo, foo, detach: invalid)); |
| Expect.throws(() => finalizer.attach(foo, null, detach: invalid)); |
| |
| Expect.throws(() => finalizer.detach(invalid)); |
| } |
| |
| final target = Foo(); |
| |
| // Should not cause errors to attach |
| finalizer.attach(target, foo); |
| finalizer.attach(target, null); |
| finalizer.attach(target, foo, detach: target); |
| |
| // Can detach with arbitrary (valid) objects. |
| finalizer.detach(target); |
| finalizer.detach(foo); |
| finalizer.detach({}); |
| } |
| |
| Future testFinalizerInvocation() async { |
| final invokedPeers = <Foo>{}; |
| final expectedPeersInvoked = <Foo>{}; |
| final finalizer = Finalizer<Foo>((Foo peer) { |
| invokedPeers.add(peer); |
| asyncEnd(); |
| }); |
| { |
| for (int i = 0; i < 10; ++i) { |
| final peer = Foo(); |
| finalizer.attach(Foo(), peer, detach: peer); |
| if (i % 3 == 0) { |
| finalizer.detach(peer); |
| } else { |
| asyncStart(); |
| expectedPeersInvoked.add(peer); |
| } |
| } |
| } |
| asyncStart(); |
| while (invokedPeers.length < expectedPeersInvoked.length) { |
| produceGarbage(); |
| await Future.delayed(const Duration(milliseconds: 10)); |
| } |
| finalizer.detach(Foo()); // Dummy use of [finalizer] to ensure it's not GCed. |
| for (final peer in expectedPeersInvoked) { |
| Expect.isTrue(invokedPeers.contains(peer)); |
| } |
| asyncEnd(); |
| } |
| |
| void produceGarbage() { |
| const approximateWordSize = 4; |
| |
| List<dynamic> sink = []; |
| for (int i = 0; i < 500; ++i) { |
| final filler = i % 2 == 0 ? 1 : sink; |
| if (i % 250 == 1) { |
| // 2 x 25 MB in old space. |
| sink = List.filled(25 * 1024 * 1024 ~/ approximateWordSize, filler); |
| } else { |
| // 498 x 50 KB in new space |
| sink = List.filled(50 * 1024 ~/ approximateWordSize, filler); |
| } |
| } |
| print(sink.hashCode); // Ensure there's real use of the allocation. |
| } |
| |
| class Foo {} |