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Apache Geode provides a database-like consistency model, reliable transaction processing and a shared-nothing architecture to maintain very low latency performance with high concurrency processing

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more contributor license
 * agreements. See the NOTICE file distributed with this work for additional information regarding
 * copyright ownership. The ASF licenses this file to You 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
 *
 * http://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 org.apache.geode.cache.query;

// import java.util.*;

/**
 * Provides statistics about a GemFire cache {@link Index}.
 *
 * @since GemFire 4.0
 */
public interface IndexStatistics {

  /**
   * Return the total number of times this index has been updated
   */
  public long getNumUpdates();

  /**
   * Returns the total amount of time (in nanoseconds) spent updating this index.
   */
  public long getTotalUpdateTime();

  /**
   * Returns the total number of times this index has been accessed by a query.
   */
  public long getTotalUses();

  /**
   * Returns the number of keys in this index.
   */
  public long getNumberOfKeys();

  /**
   * Returns the number of values in this index.
   */
  public long getNumberOfValues();


  /**
   * Return the number of values for the specified key in this index.
   */
  public long getNumberOfValues(Object key);


  /**
   * Return number of read locks taken on this index
   */
  public int getReadLockCount();

  /**
   * Returns the number of keys in this index at the highest level
   */
  public long getNumberOfMapIndexKeys();

  /**
   * Returns the number of bucket indexes created in the Partitioned Region
   */
  public int getNumberOfBucketIndexes();
}