001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018package org.apache.hadoop.hbase.master;
019
020import org.apache.hadoop.hbase.ServerName;
021import org.apache.hadoop.hbase.client.RegionInfo;
022import org.apache.yetus.audience.InterfaceAudience;
023
024/**
025 * Get notification of assignment events. The invocations are inline
026 * so make sure your implementation is fast else you'll slow hbase.
027 */
028@InterfaceAudience.Private
029public interface AssignmentListener {
030  /**
031   * The region was opened on the specified server.
032   * @param regionInfo The opened region.
033   * @param serverName The remote servers name.
034   */
035  void regionOpened(final RegionInfo regionInfo, final ServerName serverName);
036
037  /**
038   * The region was closed on the region server.
039   * @param regionInfo The closed region.
040   */
041  void regionClosed(final RegionInfo regionInfo);
042}