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Add the NonReentrant mixin to prevent an action from dispatching while already in progress. Covers preventing duplicate form submissions, avoiding race conditions, and protecting long-running operations.
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SOC 職業分類に基づく
Inject dependencies into actions using the environment, dependencies, and configuration pattern. Covers creating an Environment enum, a Dependencies class, passing them to the Store, accessing them from actions and widgets, and using dependency injection for testability.
Create a custom base action class for your app. Covers adding getter shortcuts to state parts, adding selector methods, implementing shared wrapError logic, and establishing project-wide action conventions.
Initialize, setup and configure AsyncRedux in a Flutter app. Use it whenever starting a new AsyncRedux project, or when the user requests.
Stops an AsyncRedux (Flutter) action from dispatching. Use only when the user mentions abortDispatch(), or explicitly asks to abort or prevent dispatch under certain conditions.
Checks an AsyncRedux (Flutter) action's completion status using ActionStatus right after the dispatch returns. Use only when you need to know whether an action completed, whether it failed with an error, what error it produced, or how to navigate based on success or failure.
Creates AsyncRedux (Flutter) actions that return null from reduce() to not change the state. Such actions can still do side effects, dispatch other actions, or do nothing.
| name | asyncredux-nonreentrant-mixin |
| description | Add the NonReentrant mixin to prevent an action from dispatching while already in progress. Covers preventing duplicate form submissions, avoiding race conditions, and protecting long-running operations. |
The NonReentrant mixin prevents concurrent execution of the same action type. When an action instance is already running, new dispatches of that same action are silently aborted.
Add the NonReentrant mixin to any action that should not run concurrently:
class SaveAction extends AppAction with NonReentrant {
Future<AppState?> reduce() async {
await http.put('http://myapi.com/save', body: 'data');
return null;
}
}
With this mixin:
The NonReentrant mixin overrides the abortDispatch method. When abortDispatch() returns true, the action's before(), reduce(), and after() methods will not run, and the state stays unchanged.
By default, checks are based on the action's runtime type - multiple instances of the same action class cannot run simultaneously.
Override nonReentrantKeyParams() to allow actions with different parameters to run in parallel:
class SaveItemAction extends AppAction with NonReentrant {
final String itemId;
SaveItemAction(this.itemId);
@override
Object? nonReentrantKeyParams() => itemId;
Future<AppState?> reduce() async {
await saveItem(itemId);
return null;
}
}
With this customization:
SaveItemAction('A') and SaveItemAction('B') can run concurrentlySaveItemAction('A') dispatches will still block each otherOverride computeNonReentrantKey() to make different action classes block each other:
class SaveUserAction extends AppAction with NonReentrant {
final String orderId;
SaveUserAction(this.orderId);
@override
Object? computeNonReentrantKey() => orderId;
Future<AppState?> reduce() async { ... }
}
class DeleteUserAction extends AppAction with NonReentrant {
final String orderId;
DeleteUserAction(this.orderId);
@override
Object? computeNonReentrantKey() => orderId;
Future<AppState?> reduce() async { ... }
}
This prevents SaveUserAction('123') and DeleteUserAction('123') from running simultaneously - useful when different operations on the same resource must not overlap.
You can combine NonReentrant with other compatible mixins:
class LoadDataAction extends AppAction with CheckInternet, NonReentrant {
Future<AppState?> reduce() async {
final data = await fetchData();
return state.copy(data: data);
}
}
Incompatible mixins: NonReentrant cannot be combined with:
ThrottleUnlimitedRetryCheckInternetURLs from the documentation: