1. import java.io.IOException;
  2. import java.util.HashMap;
  3. import java.util.Map;
  4. import java.util.concurrent.ExecutionException;
  5. import java.util.concurrent.TimeoutException;
  7. public class HeaderMapper {
  9. /**
  10. * Maps fields of headers metadata for manual execution with a timeout.
  11. *
  12. * @param headersMetadata A map of header names to their values.
  13. * @param fieldMap A map of field names to their corresponding header names.
  14. * @param timeoutMillis The timeout in milliseconds for each field mapping operation.
  15. * @return A map of field names to their mapped header values. Returns null if an error occurs.
  16. */
  17. public static Map<String, String> mapHeaderFields(Map<String, String> headersMetadata, Map<String, String> fieldMap, long timeoutMillis) {
  19. Map<String, String> mappedFields = new HashMap<>();
  21. for (Map.Entry<String, String> fieldEntry : fieldMap.entrySet()) {
  22. String fieldName = fieldEntry.getKey();
  23. String headerName = fieldEntry.getValue();
  25. // Simulate a field mapping operation with a timeout. Replace with your actual logic.
  26. try {
  27. String fieldValue = executeFieldMapping(headersMetadata, headerName, timeoutMillis);
  28. mappedFields.put(fieldName, fieldValue);
  29. } catch (Exception e) {
  30. System.err.println("Error mapping field " + fieldName + ": " + e.getMessage());
  31. return null; // Or handle the error in a more appropriate way.
  32. }
  33. }
  35. return mappedFields;
  36. }
  38. private static String executeFieldMapping(Map<String, String> headersMetadata, String headerName, long timeoutMillis) throws TimeoutException {
  39. // Simulate a potentially time-consuming operation. In a real application, this would be
  40. // a call to an external service or a complex calculation.
  42. //Replace with your actual mapping logic.
  43. if (headerName.equals("Header1")) {
  44. return headersMetadata.get("Header1Value");
  45. } else if (headerName.equals("Header2")) {
  46. return headersMetadata.get("Header2Value");
  47. } else {
  48. return "DefaultValue"; // Return a default value if the header is not found.
  49. }
  50. }
  53. public static void main(String[] args) {
  54. // Example usage
  55. Map<String, String> headers = new HashMap<>();
  56. headers.put("Header1Value", "Value1");
  57. headers.put("Header2Value", "Value2");
  59. Map<String, String> fieldMapping = new HashMap<>();
  60. fieldMapping.put("field1", "Header1");
  61. fieldMapping.put("field2", "Header2");
  63. long timeout = 1000; // 1 second timeout
  65. Map<String, String> mappedData = mapHeaderFields(headers, fieldMapping, timeout);
  67. if (mappedData != null) {
  68. System.out.println("Mapped Data: " + mappedData);
  69. }
  70. }
  71. }

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