geode-core/src/main/java/org/apache/geode/cache/query/CqAttributes.java

/*
 * 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 interface holds all attribute values for a CQ and provides methods for retrieving all
 * attribute settings. This interface can be modified only by the CqAttributesFactory class (before
 * CQ creation) and the CqAttributesMutator interface (after CQ creation).
 *
 * For compatibility rules and default values, see {@link CqAttributesFactory}.
 *
 * @since GemFire 5.5
 */

public interface CqAttributes {

  /**
   * Get the CqListeners set with the CQ. Returns all the Listener associated with this CQ.
   *
   * @see CqListener
   * @return CQListener[] array of CqListner
   */
  CqListener[] getCqListeners();

  /**
   * Get the CqListener set with the CQ. Returns the CqListener associated with the CQ. If there are
   * more than one CqListener throws IllegalStateException.
   *
   * @see CqListener
   * @return CqListener Object, returns null if there is no CqListener.
   */
  CqListener getCqListener();

}