cancelation_token

套件介紹

根據套件公開資料產生的選型評估，僅供參考。

The cancelation_token package offers a clean interface for managing cancellation in asynchronous operations, supporting various implementations like cancelable tasks, timeouts, and composite tokens. It enables developers to gracefully handle operation cancellation across platforms, improving responsiveness and resource management in Flutter apps. Ideal for scenarios involving network requests, timers, or long-running computations that may need to be interrupted. The package is lightweight and designed for use with Dart's async/await patterns.

適用情境

Managing cancellable network requests
Implementing timeout mechanisms
Coordinating multiple async operations
Handling user-initiated task cancellation
Controlling long-running background processes

主要特色

Support for cancelable futures
Timeout-based cancellation
Composite token grouping
Cross-platform compatibility
Simple API integration

適合對象

Developers needing fine-grained control over async operations
Apps with frequent network or timer usage
State management systems requiring cancellation support
Teams prioritizing clean async code structure

使用建議

Requires understanding of async/await flow
May add complexity for simple use cases
Not suitable for non-async operations
Limited documentation beyond basic examples
Best used with other state management solutions

原始 README

以下為關聯原始碼儲存庫的 README 原文快照，最新內容請造訪原始碼儲存庫。

This package provides an interface for cancelation tokens as well as various implementations:

CancelableToken which can be canceled programmatically;
CompositeToken which is canceled when any or all tokens are canceled;
TimeoutToken which is canceled after a timeout period.

Example

Cancel a long-running execution after a timeout.

import 'package:cancelation_token/cancelation_token.dart';

void main() async {
  final timeout = Duration(seconds: 5);
  final errorOnTimeout = CanceledException.withStackTrace('Too long!');
  final token = TimeoutToken(timeout, errorOnTimeout);
  token.ensureStarted();

  try {
    await longProcess(token);
  } on CanceledException catch (ex, st) {
    print(ex.message);
    print(ex.stackTrace);
    print(st);
  }
}

Future<void> longProcess(CancelationToken token) async {
  // very long indeed!
  while (true) {
    token.throwIfCanceled();
    await Future.delayed(const Duration(milliseconds: 100));
  }
}

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