khepri 0.1.2

Laravel-style queues, jobs and workers for Maat applications.

example/example.dart

import 'package:khepri/khepri.dart';

/// A job carries its own state as JSON and is rebuilt by [fromPayload].
class SendWelcomeEmail extends Job {
  SendWelcomeEmail(this.userId);

  static SendWelcomeEmail fromPayload(Map<String, Object?> payload) =>
      SendWelcomeEmail(payload['user_id'] as int);

  final int userId;

  @override
  Map<String, Object?> toPayload() => {'user_id': userId};

  @override
  int get tries => 3;

  @override
  List<Duration> get backoff => const [
    Duration(seconds: 10),
    Duration(minutes: 1),
  ];

  @override
  Future<void> handle() async {
    // Send the mail. Throwing releases the job for another attempt.
  }
}

/// Registered once, where the application boots.
void registerJobs(JobRegistry jobs) {
  jobs.register<SendWelcomeEmail>(
    'send_welcome_email',
    SendWelcomeEmail.fromPayload,
  );
}

/// With `QueueServiceProvider` installed, dispatching is one call.
Future<void> welcome(int userId) => dispatch(SendWelcomeEmail(userId));