Created
April 25, 2018 08:08
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RxDart OnErrorResumeNextStream transformet that passes the error
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class OnErrorResumeNextStreamTransformer2<T> | |
extends StreamTransformerBase<T, T> { | |
final StreamTransformer<T, T> transformer; | |
// From the orginal version parameter was changed from `Stream<T> recoveryStream` to `Stream<T> Function (dynamic error) recoveryStream` | |
OnErrorResumeNextStreamTransformer2(Stream<T> Function (dynamic error) recoveryStream) | |
: transformer = _buildTransformer(recoveryStream); | |
@override | |
Stream<T> bind(Stream<T> stream) => transformer.bind(stream); | |
// From the orginal version parameter was changed from `Stream<T> recoveryStream` to `Stream<T> Function (dynamic error) recoveryStream` | |
static StreamTransformer<T, T> _buildTransformer<T>( | |
Stream<T> Function (dynamic error) recoveryStream) { | |
return new StreamTransformer<T, T>((Stream<T> input, bool cancelOnError) { | |
StreamSubscription<T> inputSubscription; | |
StreamSubscription<T> recoverySubscription; | |
StreamController<T> controller; | |
bool shouldCloseController = true; | |
void safeClose() { | |
if (shouldCloseController) { | |
controller.close(); | |
} | |
} | |
controller = new StreamController<T>( | |
sync: true, | |
onListen: () { | |
inputSubscription = | |
input.listen(controller.add, onError: (dynamic e, dynamic s) { | |
shouldCloseController = false; | |
// This line now is calling `recoveryStream` as a function with an error, instead of just using Stream object | |
recoverySubscription = recoveryStream(e).listen(controller.add, | |
onError: controller.addError, | |
onDone: controller.close, | |
cancelOnError: cancelOnError); | |
inputSubscription.cancel(); | |
}, onDone: safeClose, cancelOnError: cancelOnError); | |
}, | |
onPause: ([Future<dynamic> resumeSignal]) { | |
inputSubscription?.pause(resumeSignal); | |
recoverySubscription?.pause(resumeSignal); | |
}, | |
onResume: () { | |
inputSubscription?.resume(); | |
recoverySubscription?.resume(); | |
}, | |
onCancel: () { | |
return Future.wait<dynamic>(<Future<dynamic>>[ | |
inputSubscription?.cancel(), | |
recoverySubscription?.cancel() | |
].where((Future<dynamic> future) => future != null)); | |
}); | |
return controller.stream.listen(null); | |
}); | |
} | |
} |
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