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/*
 * Copyright (c) 2010-2015 Pivotal Software, Inc. All rights reserved.
 *
 * 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
 *
 * 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. See accompanying
 * LICENSE file.
 */

package com.gemstone.gemfire.cache.query;

/**
 * This class provides methods to get statistical information about a registered Continuous Query (CQ)
 * represented by the CqQuery object. 
 * 
 * @since 5.5
 * @author Anil
 */
public interface CqStatistics {

  /**
   * Get number of Insert events qualified by this CQ.
   * @return long number of inserts.
   */
  public long numInserts();
  
  /**
   * Get number of Delete events qualified by this CQ.
   * @return long number of deletes.
   */
  public long numDeletes();
  
  /**
   * Get number of Update events qualified by this CQ.
   * @return long number of updates.
   */
  public long numUpdates();

  /**
   * Get total of all the events qualified by this CQ.
   * @return long total number of events.
   */
  public long numEvents();

}