protected ForwardingCache() {}

  @Override
  protected abstract Cache<K, V> delegate();

  /** @since 11.0 */
  @Override
  @CheckForNull
  public V getIfPresent(Object key) {
    return delegate().getIfPresent(key);
  }

  /** @since 11.0 */
  @Override
  public V get(K key, Callable<? extends V> valueLoader) throws ExecutionException {
    return delegate().get(key, valueLoader);
  }

 * implementation for the {@link #get(Object)} and {@link #getIfPresent} methods. {@link
 * #getUnchecked}, {@link #get(Object, Callable)}, and {@link #getAll} are implemented in terms of
 * {@code get}; {@link #getAllPresent} is implemented in terms of {@code getIfPresent}; {@link
 * #putAll} is implemented in terms of {@link #put}, {@link #invalidateAll(Iterable)} is implemented

 *
 * <p>To implement a cache, the programmer needs only to extend this class and provide an
 * implementation for the {@link #put} and {@link #getIfPresent} methods. {@link #getAllPresent} is
 * implemented in terms of {@link #getIfPresent}; {@link #putAll} is implemented in terms of {@link
 * #put}, {@link #invalidateAll(Iterable)} is implemented in terms of {@link #invalidate}. The

  }

  // Since we can't pass a concrete SomeEnum.class directly, we need to use a raw type.
  @SuppressWarnings("unchecked")
  @Benchmark
  boolean getIfPresent(int repetitions) {
    boolean retVal = false;
    for (int i = 0; i < repetitions; ++i) {
      retVal &= Enums.getIfPresent(enumType, sampleData[i & 255]).isPresent();
    }
    return retVal;
  }

  private enum SmallEnum {
    X0,
    X1,
    X2
  }

        return newValue;
      } catch (Exception e) {
        throw new ExecutionException(e);
      }
    }

    @Override
    public @Nullable V getIfPresent(Object key) {
      return localCache.getIfPresent(key);
    }

    @Override
    public void put(K key, V value) {
      localCache.put(key, value);
    }

    @Override
    public void invalidate(Object key) {

   * as a result of a refresh or if the cache loader returned more items than was requested. {@code
   * missCount} may also be incremented not in conjunction with this (nor {@link
   * #loadExceptionCount}) on calls to {@code getIfPresent}.
   */
  public long loadSuccessCount() {
    return loadSuccessCount;
  }

  /**
   * Returns the number of times {@link Cache} lookup methods threw an exception while loading a new

   * as a result of a refresh or if the cache loader returned more items than was requested. {@code
   * missCount} may also be incremented not in conjunction with this (nor {@link
   * #loadExceptionCount}) on calls to {@code getIfPresent}.
   */
  public long loadSuccessCount() {
    return loadSuccessCount;
  }

  /**
   * Returns the number of times {@link Cache} lookup methods threw an exception while loading a new

   * cached value for {@code key}.
   *
   * @since 11.0
   */
  @CheckForNull
  @CanIgnoreReturnValue // TODO(b/27479612): consider removing this?
  V getIfPresent(@CompatibleWith("K") Object key);

  /**
   * Returns the value associated with {@code key} in this cache, obtaining that value from {@code

  }

  // Since we can't pass a concrete SomeEnum.class directly, we need to use a raw type.
  @SuppressWarnings("unchecked")
  @Benchmark
  boolean getIfPresent(int repetitions) {
    boolean retVal = false;
    for (int i = 0; i < repetitions; ++i) {
      retVal &= Enums.getIfPresent(enumType, sampleData[i & 255]).isPresent();
    }
    return retVal;
  }

  private enum SmallEnum {
    X0,
    X1,
    X2
  }

      cache.invalidate(1);
      assertEquals(0, cache.size());

      entry.setValue(3);
      assertEquals(1, cache.size());
      assertEquals(3, cache.getIfPresent(1));
      checkValidState(cache);

      assertThrows(NullPointerException.class, () -> entry.setValue(null));
      checkValidState(cache);
    }
  }