1. /**
  2. * Simple message queue resource loader for maintenance tasks.
  3. */
  4. class MessageQueueLoader {
  5. constructor(queueName, connectionUrl) {
  6. this.queueName = queueName;
  7. this.connectionUrl = connectionUrl;
  8. }
  10. /**
  11. * Fetches messages from the queue.
  12. * @returns {Promise<Array<object>>} A promise that resolves to an array of messages. Rejects on error.
  13. */
  14. async getMessages() {
  15. try {
  16. // Simulate fetching messages from a queue. Replace with actual queue client code.
  17. console.log(`Fetching messages from queue: ${this.queueName} at ${this.connectionUrl}`);
  18. await new Promise(resolve => setTimeout(resolve, 500)); // Simulate network delay
  20. const messages = [
  21. { id: 1, data: 'Task 1' },
  22. { id: 2, data: 'Task 2' },
  23. { id: 3, data: 'Task 3' }
  24. ];
  25. return messages;
  27. } catch (error) {
  28. console.error(`Error fetching messages from queue ${this.queueName}:`, error);
  29. throw error; // Re-throw to propagate the error
  30. }
  31. }
  34. /**
  35. * Marks a message as processed. (Simulated)
  36. * @param {number} messageId
  37. */
  38. async markMessageAsProcessed(messageId) {
  39. try {
  40. console.log(`Marking message ${messageId} as processed in queue ${this.queueName}`);
  41. await new Promise(resolve => setTimeout(resolve, 200)); // Simulate processing
  42. } catch (error) {
  43. console.error(`Error marking message ${messageId} as processed in queue ${this.queueName}:`, error);
  44. throw error;
  45. }
  46. }
  47. }
  50. // Example usage:
  51. async function main() {
  52. const queueLoader = new MessageQueueLoader('maintenance_queue', 'http://localhost:8080');
  54. try {
  55. const messages = await queueLoader.getMessages();
  56. console.log('Messages received:', messages);
  58. for (const message of messages) {
  59. await queueLoader.markMessageAsProcessed(message.id);
  60. }
  61. console.log('Maintenance tasks completed.');
  63. } catch (error) {
  64. console.error('An error occurred:', error);
  65. }
  66. }
  68. main();

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