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.coprocessor;
019
020import org.apache.hadoop.conf.Configuration;
021import org.apache.hadoop.hbase.HBaseInterfaceAudience;
022import org.apache.yetus.audience.InterfaceAudience;
023import org.apache.yetus.audience.InterfaceStability;
024
025/**
026 * This interface is used to perform whatever task is necessary for reloading coprocessors on
027 * HMaster, HRegionServer, and HRegion. Since the steps required to reload coprocessors varies for
028 * each of these types, this interface helps with code flexibility by allowing a lamda function to
029 * be provided for the {@link #reload(Configuration) reload()} method. <br>
030 * <br>
031 * See {@link org.apache.hadoop.hbase.util.CoprocessorConfigurationUtil#maybeUpdateCoprocessors
032 * CoprocessorConfigurationUtil.maybeUpdateCoprocessors()} and its usage in
033 * {@link org.apache.hadoop.hbase.conf.ConfigurationObserver#onConfigurationChange
034 * onConfigurationChange()} with HMaster, HRegionServer, and HRegion for an idea of how this
035 * interface is helpful.
036 */
037@InterfaceAudience.LimitedPrivate(HBaseInterfaceAudience.COPROC)
038@InterfaceStability.Evolving
039@FunctionalInterface
040public interface CoprocessorReloadTask {
041  void reload(Configuration conf);
042}