Allow removal of all values computed by a ClassLoaderValue

Author: mcculls

utils/src/main/java/datadog/instrument/utils/ClassLoaderValue.java

@@ -109,6 +109,13 @@ public final void remove(ClassLoader cl) {
     }
   }
 
+  /** Removes all values computed by this {@code ClassLoaderValue}. */
+  public final void clear() {
+    bootValue = null;
+    systemValue = null;
+    otherValues.clear();
+  }
+
   /**
    * Visits the values computed by this {@code ClassLoaderValue}, for diagnostic purposes.
    *

utils/src/test/java/datadog/instrument/utils/ClassLoaderValueTest.java

@@ -95,6 +95,10 @@ void basicOperation() {
     assertThat(classLoaderValue.get(cl5)).isEqualTo("5=CL5");
 
     assertEquals(6, classLoaderValue.size());
+
+    classLoaderValue.clear();
+
+    assertEquals(0, classLoaderValue.size());
   }
 
   @Test