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Merge pull request #25 from LoveCommunity/feature/publish_subject
add `PublishSubject`
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Original file line number | Diff line number | Diff line change |
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import 'package:meta/meta.dart'; | ||
import 'package:disposal/disposal.dart'; | ||
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import '../observers/observer.dart'; | ||
import 'subject.dart'; | ||
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@internal | ||
class BasicSubject<T> implements Subject<T> { | ||
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final _idGenerator = _SerialNumberGenerator(); | ||
final Map<int, OnData<T>> _map = {}; | ||
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@override | ||
Disposable observe(OnData<T> onData) { | ||
final id = _idGenerator.generate(); | ||
_map[id] = onData; | ||
return Disposable(() { | ||
_map.remove(id); | ||
}); | ||
} | ||
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@override | ||
void onData(T data) { | ||
if (_map.isEmpty) { | ||
return; | ||
} | ||
for (final onData in _map.values) { | ||
onData(data); | ||
} | ||
} | ||
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@override | ||
void dispose() { | ||
_map.clear(); | ||
} | ||
} | ||
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class _SerialNumberGenerator { | ||
int? _last; | ||
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int generate() { | ||
final it = _last == null ? 0 : _last! + 1; | ||
_last = it; | ||
return it; | ||
} | ||
} |
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import 'package:disposal/disposal.dart'; | ||
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import '../observers/observer.dart'; | ||
import 'basic_subject.dart'; | ||
import 'subject.dart'; | ||
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class PublishSubject<T> implements Subject<T> { | ||
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bool _disposed = false; | ||
final _subject = BasicSubject<T>(); | ||
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@override | ||
Disposable observe(OnData<T> onData) { | ||
if (_disposed) { | ||
throw StateError("Subject is disposed and can't be observed."); | ||
} | ||
return _subject.observe(onData); | ||
} | ||
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@override | ||
void onData(T data) { | ||
if (_disposed) { | ||
return; | ||
} | ||
_subject.onData(data); | ||
} | ||
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@override | ||
void dispose() { | ||
if (_disposed) { | ||
return; | ||
} | ||
_disposed = true; | ||
_subject.dispose(); | ||
} | ||
} |
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Original file line number | Diff line number | Diff line change |
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import 'package:test/test.dart'; | ||
import 'package:scopes/scopes.dart'; | ||
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import '../../toolbox/observable_tester.dart'; | ||
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void main() { | ||
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test('publish subject forward data to single observer', () { | ||
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final subject = PublishSubject<String>(); | ||
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final tester = ObservableTester( | ||
subject, | ||
); | ||
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tester.startObserve(); | ||
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expect(tester.recorded, []); | ||
subject.onData('a'); | ||
expect(tester.recorded, [ | ||
'a', | ||
]); | ||
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tester.stopObserve(); | ||
subject.dispose(); | ||
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}); | ||
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test('publish subject forward data to multiple observers', () { | ||
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final subject = PublishSubject<String>(); | ||
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final tester1 = ObservableTester( | ||
subject, | ||
); | ||
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final tester2 = ObservableTester( | ||
subject, | ||
); | ||
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tester1.startObserve(); | ||
tester2.startObserve(); | ||
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expect(tester1.recorded, []); | ||
expect(tester2.recorded, []); | ||
subject.onData('a'); | ||
expect(tester1.recorded, [ | ||
'a', | ||
]); | ||
expect(tester2.recorded, [ | ||
'a', | ||
]); | ||
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tester1.stopObserve(); | ||
tester2.stopObserve(); | ||
subject.dispose(); | ||
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}); | ||
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test("publish subject only forward data after observed", () { | ||
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final subject = PublishSubject<String>(); | ||
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final tester = ObservableTester( | ||
subject, | ||
); | ||
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subject.onData('a'); | ||
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tester.startObserve(); | ||
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expect(tester.recorded, []); | ||
subject.onData('b'); | ||
expect(tester.recorded, [ | ||
'b', | ||
]); | ||
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tester.stopObserve(); | ||
subject.dispose(); | ||
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}); | ||
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test("publish subject won't forward data after observation disposed", () { | ||
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final subject = PublishSubject<String>(); | ||
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final tester = ObservableTester( | ||
subject, | ||
); | ||
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tester.startObserve(); | ||
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subject.onData('a'); | ||
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tester.stopObserve(); | ||
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expect(tester.recorded, [ | ||
'a', | ||
]); | ||
subject.onData('b'); | ||
expect(tester.recorded, [ | ||
'a', | ||
]); | ||
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subject.dispose(); | ||
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}); | ||
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test("publish subject won't forward data after subject disposed", () { | ||
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final subject = PublishSubject<String>(); | ||
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final tester = ObservableTester( | ||
subject, | ||
); | ||
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tester.startObserve(); | ||
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subject.onData('a'); | ||
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subject.dispose(); | ||
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expect(tester.recorded, [ | ||
'a', | ||
]); | ||
subject.onData('b'); | ||
expect(tester.recorded, [ | ||
'a', | ||
]); | ||
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tester.stopObserve(); | ||
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}); | ||
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test('publish subject throws error when been observed after it is disposed', () { | ||
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final subject = PublishSubject<String>(); | ||
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subject.dispose(); | ||
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expect( | ||
() { | ||
subject.observe((data) {}); | ||
}, | ||
throwsA( | ||
isA<StateError>() | ||
.having( | ||
(error) => error.toString(), | ||
'description', | ||
contains("Subject is disposed and can't be observed."), | ||
), | ||
), | ||
); | ||
}); | ||
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} |