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/*
 * Copyright 2021 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.appengine.api.memcache;

/**
 * Statistics from the cache, available via {@link MemcacheService#getStatistics()}
 *
 */
public interface Stats {
  /**
   * The counter of "successful" {@link MemcacheService#get(Object)} or
   * {@link MemcacheService#contains(Object)} operations.
   */
  long getHitCount();

  /**
   * The counter of "unsuccessful" {@link MemcacheService#get(Object)} or
   * {@link MemcacheService#contains(Object)} operations.
   */
  long getMissCount();

  /**
   * Sum of key and value bytes in successful get() and contains().
   */
  long getBytesReturnedForHits();

  /**
   * Number of entries currently "alive" in the cache.
   */
  long getItemCount();

  /**
   * Sum of key and value sizes for all live entries currently in cache.
   */
  long getTotalItemBytes();

  /**
   * Milliseconds since last access of least-recently-used live entry.
   */
  int getMaxTimeWithoutAccess();
}