CacheLoader<Object, Object> loader =
        new CacheLoader<Object, Object>() {
          @Override
          public Object load(Object key) {
            return one;
          }

          @Override
          public ListenableFuture<Object> reload(Object key, Object oldValue) {
            return Futures.immediateFuture(two);
          }
        };

      CacheLoader<String, String> loader =
          new CacheLoader<String, String>() {
            @Override
            public String load(String key) {
              return key + "Load";
            }

            @Override
            public ListenableFuture<String> reload(String key, String oldValue) {
              return refreshExecutor.submit(
                  () -> {
                    reloadStarted.countDown();

      CacheLoader<String, String> loader =
          new CacheLoader<String, String>() {
            @Override
            public String load(String key) {
              return key + "Load";
            }

            @Override
            public ListenableFuture<String> reload(String key, String oldValue) {
              return refreshExecutor.submit(
                  () -> {
                    reloadStarted.countDown();

    }

    @Override
    public V load(K key) {
      return computingFunction.apply(checkNotNull(key));
    }

    private static final long serialVersionUID = 0;
  }

  /**
   * Returns a {@code CacheLoader} which wraps {@code loader}, executing calls to {@link
   * CacheLoader#reload} using {@code executor}.
   *
   * <p>This method is useful only when {@code loader.reload} has a synchronous implementation, such

        stopwatch.start();
        V previousValue = oldValue.get();
        if (previousValue == null) {
          V newValue = loader.load(key);
          return set(newValue) ? futureValue : Futures.immediateFuture(newValue);
        }
        ListenableFuture<V> newValue = loader.reload(key, previousValue);
        if (newValue == null) {
          return Futures.immediateFuture(null);
        }

   * in a single load operation.
   */
  public double missRate() {
    long requestCount = requestCount();
    return (requestCount == 0) ? 0.0 : (double) missCount / requestCount;
  }

  /**
   * Returns the total number of times that {@link Cache} lookup methods attempted to load new
   * values. This includes both successful load operations and those that threw exceptions. This is

   * in a single load operation.
   */
  public double missRate() {
    long requestCount = requestCount();
    return (requestCount == 0) ? 0.0 : (double) missCount / requestCount;
  }

  /**
   * Returns the total number of times that {@link Cache} lookup methods attempted to load new
   * values. This includes both successful load operations and those that threw exceptions. This is

   * 6.7). Unlike {@link Class#getPackage}, this method only parses the class name, without
   * attempting to define the {@link Package} and hence load files.
   */
  public static String getPackageName(Class<?> clazz) {
    return getPackageName(clazz.getName());
  }

  /**

    final CountDownLatch computingLatch = new CountDownLatch(1);
    CacheLoader<String, String> computingFunction =
        new CacheLoader<String, String>() {
          @Override
          public String load(String key) throws InterruptedException {
            if (shouldWait.get()) {
              computingLatch.await();
            }
            return key;
          }
        };

      super(urls);
    }

    @Override
    protected synchronized Class<?> loadClass(String name, boolean resolve)
        throws ClassNotFoundException {
      // Force Finalizer to load from this class loader, not its parent.
      if (name.equals(Finalizer.class.getName())) {
        Class<?> clazz = findClass(name);
        if (resolve) {
          resolveClass(clazz);
        }