/*
 * 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;

/**
 * This class provides methods to get aggregate statistical information about the CQs of a client.
 *
 * @since GemFire 5.5
 */
public interface CqServiceStatistics {

  /**
   * Get the number of CQs currently active. Active CQs are those which are executing (in running
   * state).
   *
   * @return long number of CQs
   */
  long numCqsActive();

  /**
   * Get the total number of CQs created. This is a cumulative number.
   *
   * @return long number of CQs created.
   */
  long numCqsCreated();

  /**
   * Get the total number of closed CQs. This is a cumulative number.
   *
   * @return long number of CQs closed.
   */
  long numCqsClosed();

  /**
   * Get the number of stopped CQs currently.
   *
   * @return number of CQs stopped.
   */
  long numCqsStopped();

  /**
   * Get number of CQs that are currently active or stopped. The CQs included in this number are
   * either running or stopped (suspended). Closed CQs are not included.
   *
   * @return long number of CQs on client.
   */
  long numCqsOnClient();

  /**
   * Get number of CQs on the given region. Active CQs and stopped CQs on this region are included
   * and closed CQs are not included.
   *
   * @param regionFullPath the full path of the region
   * @return long number of CQs on the region.
   */
  long numCqsOnRegion(String regionFullPath);

}
