1. import java.util.concurrent.Executors;
  2. import java.util.concurrent.ScheduledExecutorService;
  3. import java.util.concurrent.TimeUnit;
  4. import java.util.HashMap;
  5. import java.util.Map;
  7. public class MetadataRetrier {
  9. private static final ScheduledExecutorService scheduler = Executors.newScheduledThreadPool(1);
  11. public static void main(String[] args) {
  12. // Example usage: Define metadata retry tasks
  13. Map<String, MetadataRetryTask> tasks = new HashMap<>();
  14. tasks.put("metadata1", new MetadataRetryTask("metadata1", 3, 5)); // Retry 3 times, wait 5 seconds
  15. tasks.put("metadata2", new MetadataRetryTask("metadata2", 5, 10)); // Retry 5 times, wait 10 seconds
  19. // Schedule the tasks to run
  20. for (MetadataRetryTask task : tasks.values()) {
  21. scheduleRetry(task);
  22. }
  24. // Keep the main thread alive (optional, for continuous running)
  25. try {
  26. Thread.sleep(60 * 60 * 1000); // Run for 1 hour
  27. } catch (InterruptedException e) {
  28. Thread.currentThread().interrupt();
  29. } finally {
  30. scheduler.shutdown(); // Shutdown the scheduler gracefully
  31. }
  32. }
  34. private static void scheduleRetry(MetadataRetryTask task) {
  35. scheduler.scheduleAtFixedRate(() -> {
  36. try {
  37. // Perform the metadata operation here
  38. boolean success = performMetadataOperation(task.metadataName);
  40. if (!success) {
  41. System.out.println("Metadata operation failed for " + task.metadataName + ". Retrying...");
  42. // Optionally add a delay before the next retry
  43. try {
  44. Thread.sleep(task.delay);
  45. } catch (InterruptedException e) {
  46. Thread.currentThread().interrupt();
  47. }
  48. } else {
  49. System.out.println("Metadata operation successful for " + task.metadataName);
  50. }
  51. } catch (Exception e) {
  52. System.err.println("An error occurred during metadata operation for " + task.metadataName + ": " + e.getMessage());
  53. // Optionally add a delay before the next retry
  54. try {
  55. Thread.sleep(task.delay);
  56. } catch (InterruptedException e) {
  57. Thread.currentThread().interrupt();
  58. }
  59. }
  60. }, 0, task.interval, TimeUnit.SECONDS);
  61. }
  63. // Define a task for retrying a specific metadata operation
  64. static class MetadataRetryTask {
  65. String metadataName;
  66. int retries;
  67. long delay;
  69. public MetadataRetryTask(String metadataName, int retries, long delay) {
  70. this.metadataName = metadataName;
  71. this.retries = retries;
  72. this.delay = delay;
  73. }
  74. }
  77. // Placeholder for the actual metadata operation. Replace with your code.
  78. private static boolean performMetadataOperation(String metadataName) {
  79. // Simulate a metadata operation that might fail
  80. if (metadataName.equals("metadata1")) {
  81. return Math.random() < 0.5; // 50% chance of failure
  82. } else if (metadataName.equals("metadata2")) {
  83. return Math.random() < 0.7; // 70% chance of failure
  84. }
  85. return true; // Assume success for other metadata names
  86. }
  87. }

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