1. import java.util.HashMap;
  2. import java.util.Map;
  3. import java.util.function.Function;
  5. class ArrayCache {
  7. private final Map<String, Object> cache = new HashMap<>();
  9. /**
  10. * Caches the result of an array operation.
  11. *
  12. * @param key A unique identifier for the array operation.
  13. * @param func The function that performs the array operation.
  14. * @param <T> The type of the array elements.
  15. * @param <R> The type of the result.
  16. * @return The cached result, or the result of the function if not cached. Returns null on failure.
  17. */
  18. public <T, R> R getArrayResult(String key, Function<T[], R> func, T[] arr) {
  19. // Check if the result is already cached
  20. if (cache.containsKey(key)) {
  21. Object cachedResult = cache.get(key);
  22. if (cachedResult instanceof R) {
  23. return (R) cachedResult;
  24. } else {
  25. //Cache contains incorrect data type, clear the cache and return null
  26. cache.remove(key);
  27. return null;
  28. }
  29. }
  31. try {
  32. // Perform the array operation
  33. R result = func.apply(arr);
  35. // Cache the result
  36. cache.put(key, result);
  37. return result;
  39. } catch (Exception e) {
  40. // Handle any exceptions that occur during the array operation
  41. System.err.println("Error during array operation for key: " + key + ". Error: " + e.getMessage());
  42. // Optionally, log the error or take other appropriate action
  43. return null;
  44. }
  45. }
  47. public static void main(String[] args) {
  48. // Example Usage
  49. ArrayCache cache = new ArrayCache();
  51. // Example function to sum an array of integers
  52. Function<Integer[], Integer> sumArray = arr -> {
  53. if (arr == null || arr.length == 0) {
  54. return 0;
  55. }
  56. int sum = 0;
  57. for (int num : arr) {
  58. sum += num;
  59. }
  60. return sum;
  61. };
  63. // Example array
  64. Integer[] numbers = {1, 2, 3, 4, 5};
  66. // Get the sum of the array
  67. Integer sum = cache.getArrayResult("sum_numbers", sumArray, numbers);
  69. if (sum != null) {
  70. System.out.println("Sum of numbers: " + sum);
  71. }
  72. else {
  73. System.out.println("Failed to compute sum.");
  74. }
  76. //Try again to get the same result (should be cached)
  77. sum = cache.getArrayResult("sum_numbers", sumArray, numbers);
  78. if (sum != null) {
  79. System.out.println("Sum of numbers (cached): " + sum);
  80. }
  81. else {
  82. System.out.println("Failed to compute sum.");
  83. }
  85. //Example with error handling
  86. Function<Integer[], Integer> divideArray = arr -> {
  87. if(arr == null || arr.length == 0) {
  88. throw new IllegalArgumentException("Array cannot be null or empty");
  89. }
  90. return arr[0] / arr[1];
  91. };
  93. Integer[] divideNumbers = {10, 2};
  94. Integer result = cache.getArrayResult("divide_numbers", divideArray, divideNumbers);
  96. if(result != null) {
  97. System.out.println("Result of division: " + result);
  98. } else {
  99. System.out.println("Failed to compute division.");
  100. }
  101. }
  102. }

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