46 lines
1.5 KiB
Dart
46 lines
1.5 KiB
Dart
// Copyright (C) 2022 WYATT GROUP
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// Please see the AUTHORS file for details.
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <https://www.gnu.org/licenses/>.
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import 'dart:async';
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import 'package:wyatt_architecture/wyatt_architecture.dart';
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/// Usecase observers
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mixin Observer<Parameters, ReturnType> {
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/// Called before usecase is runned.
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/// Useful to check the preconditions
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FutureOr<void> onStart(Parameters? params) {}
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/// Called when error occures during main scenario
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/// Useful to run alternative scenario
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FutureOr<void> onError(AppException? error) {}
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}
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/// Specific observer for classic usecase
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mixin AsyncObserver<ReturnType> {
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/// Called when usecase is completed
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FutureOr<void> onComplete(ReturnType? data) {}
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}
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/// Specific observer for stream case usecase
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mixin StreamObserver<ReturnType> {
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/// Replaces the data event handler of this subscription.
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void onDone() {}
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/// Replaces the done event handler of this subscription.
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void onData(ReturnType? data) {}
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}
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