1. import java.lang.reflect.Method;
  2. import java.util.HashMap;
  3. import java.util.Map;
  5. public class TaskQueueInstrumentation {
  7. private static final Map<String, String> methodToInstrumentation = new HashMap<>(); // Maps method name to instrumentation class name
  9. static {
  10. // Register methods to be instrumented. Example:
  11. methodToInstrumentation.put("execute", "TaskQueueExecutorInstrumentation");
  12. methodToInstrumentation.put("processTask", "TaskQueueProcessorInstrumentation");
  13. }
  15. /**
  16. * Instruments the given task queue class.
  17. * @param clazz The task queue class to instrument.
  18. */
  19. public static void instrument(Class<?> clazz) {
  20. if (clazz == null) {
  21. throw new IllegalArgumentException("Class cannot be null.");
  22. }
  24. for (Method method : clazz.getDeclaredMethods()) {
  25. String methodName = method.getName();
  26. if (methodToInstrumentation.containsKey(methodName)) {
  27. try {
  28. Class<?> instrumentationClass = Class.forName(methodToInstrumentation.get(methodName));
  29. InstrumentationHelper.instrumentMethod(clazz, method, instrumentationClass);
  30. } catch (ClassNotFoundException e) {
  31. System.err.println("Instrumentation class not found: " + methodToInstrumentation.get(methodName));
  32. e.printStackTrace();
  33. } catch (Exception e) {
  34. System.err.println("Error instrumenting method " + methodName + ": " + e.getMessage());
  35. e.printStackTrace();
  36. }
  37. }
  38. }
  39. }
  41. /**
  42. * A helper class to handle the actual instrumentation logic.
  43. */
  44. static class InstrumentationHelper {
  46. /**
  47. * Instruments a single method.
  48. * @param targetClass The class to instrument.
  49. * @param targetMethod The method to instrument.
  50. * @param instrumentationClass The class containing the instrumentation logic.
  51. */
  52. public static void instrumentMethod(Class<?> targetClass, Method targetMethod, Class<?> instrumentationClass) throws Exception {
  54. //Get the instrumentation class's main method.
  55. Method instrumentationMainMethod = instrumentationClass. getMainMethod();
  57. //Check if the main method exists.
  58. if(instrumentationMainMethod == null) {
  59. throw new IllegalArgumentException("Instrumentation class must have a main method.");
  60. }
  62. //Create a new instance of the instrumentation class.
  63. Object instrumentationObject = instrumentationClass.getDeclaredConstructor().newInstance();
  65. //Set the target method on the instrumentation object.
  66. java.lang.reflect.Field targetMethodField = targetMethod.getClass().getDeclaredField("method");
  67. targetMethodField.setAccessible(true);
  68. targetMethodField.set(instrumentationObject, targetMethod);
  70. //Call the main method of the instrumentation class.
  71. instrumentationMainMethod.invoke(instrumentationObject);
  72. }
  73. }
  74. }

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