test/hotspot/jtreg/vmTestbase/gc/g1/unloading/keepref/NullClassloaderHolder.java

rev 59093 : imported patch randomness-code_vmTestbase_unloading

*** 31,40 ****
--- 31,41 ----
   */
  public class NullClassloaderHolder implements RefHolder {
  
      private static final int NUMBER_OF_CLASSES = 1000;
      private static Set<Class<?>> classesPool = Collections.synchronizedSet(new HashSet<Class<?>>());
+     private final Random random;
  
      static {
          for (int i = 1; i <= NUMBER_OF_CLASSES; i++) {
              String className = "gc.g1.unloading.rootSetHelper.classesPool.Class" + i;
              try {
*** 47,56 ****
--- 48,61 ----
                  throw new RuntimeException("Test bug", e);
              }
          }
      }
  
+     public NullClassloaderHolder(long seed) {
+         random = new Random(seed);
+     }
+ 
      @Override
      public Object hold(Object object) {
          if (classesPool.isEmpty()) {
              return null;
          } else {
*** 64,79 ****
                  throw new RuntimeException("Test bug", e);
              }
          }
      }
  
!     private static Field getRandomField(Class<?> clazz) {
          ArrayList<Field> fields = new ArrayList<>();
          for (Field f : clazz.getFields()) {
              if (f.getName().startsWith("staticField")) {
                  fields.add(f);
              }
          }
!         return fields.get(new Random().nextInt(fields.size()));
      }
  
  }
--- 69,84 ----
                  throw new RuntimeException("Test bug", e);
              }
          }
      }
  
!     private Field getRandomField(Class<?> clazz) {
          ArrayList<Field> fields = new ArrayList<>();
          for (Field f : clazz.getFields()) {
              if (f.getName().startsWith("staticField")) {
                  fields.add(f);
              }
          }
!         return fields.get(random.nextInt(fields.size()));
      }
  
  }