return evictionCount;
  }

  /**
   * Returns a new {@code CacheStats} representing the difference between this {@code CacheStats}
   * and {@code other}. Negative values, which aren't supported by {@code CacheStats} will be
   * rounded up to zero.
   */
  public CacheStats minus(CacheStats other) {
    return new CacheStats(
        Math.max(0, saturatedSubtract(hitCount, other.hitCount)),

    return evictionCount;
  }

  /**
   * Returns a new {@code CacheStats} representing the difference between this {@code CacheStats}
   * and {@code other}. Negative values, which aren't supported by {@code CacheStats} will be
   * rounded up to zero.
   */
  public CacheStats minus(CacheStats other) {
    return new CacheStats(
        Math.max(0, saturatedSubtract(hitCount, other.hitCount)),

  virtual std::vector<string> ListFunctionNames() = 0;

  struct CacheStats {
    int64_t kernel_cache_size;
    int64_t device_cache_size;
    std::map<std::string, int64_t> func_kernel_cache_entries;
    int64_t local_rendezvous_cache_active_size;
  };
  virtual CacheStats GetCacheStats() = 0;

  //===--------------------------------------------------------------------===//

            @Override
            public void recordEviction() {}

            @Override
            public CacheStats snapshot() {
              return EMPTY_STATS;
            }
          });
  static final CacheStats EMPTY_STATS = new CacheStats(0, 0, 0, 0, 0, 0);

  /*
   * We avoid using a method reference or lambda here for now:
   *

    LocalLoadingCache<Object, Object> cache = makeCache(builder, identityLoader());
    assertEquals(EMPTY_STATS, cache.stats());

    Object one = new Object();
    cache.getUnchecked(one);
    CacheStats stats = cache.stats();
    assertEquals(1, stats.requestCount());
    assertEquals(0, stats.hitCount());
    assertEquals(0.0, stats.hitRate());
    assertEquals(1, stats.missCount());

    LocalLoadingCache<Object, Object> cache = makeCache(builder, identityLoader());
    assertEquals(EMPTY_STATS, cache.stats());

    Object one = new Object();
    cache.getUnchecked(one);
    CacheStats stats = cache.stats();
    assertEquals(1, stats.requestCount());
    assertEquals(0, stats.hitCount());
    assertEquals(0.0, stats.hitRate());
    assertEquals(1, stats.missCount());

    for (RemovalNotification<String, String> notification : removalListener) {
      assertEquals("Invalid removal notification", notification.getKey(), notification.getValue());
    }

    CacheStats stats = cache.stats();
    assertEquals(removalListener.size(), stats.evictionCount());
    assertEquals(computeCount.get(), stats.loadSuccessCount());

    for (RemovalNotification<String, String> notification : removalListener) {
      assertEquals("Invalid removal notification", notification.getKey(), notification.getValue());
    }

    CacheStats stats = cache.stats();
    assertEquals(removalListener.size(), stats.evictionCount());
    assertEquals(computeCount.get(), stats.loadSuccessCount());