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.quotas;
019
020import java.io.IOException;
021import org.apache.hadoop.hbase.exceptions.DeserializationException;
022import org.apache.hadoop.hbase.master.BooleanStateStore;
023import org.apache.hadoop.hbase.master.region.MasterRegion;
024import org.apache.hadoop.hbase.util.Bytes;
025import org.apache.hadoop.hbase.zookeeper.ZKWatcher;
026import org.apache.yetus.audience.InterfaceAudience;
027import org.apache.zookeeper.KeeperException;
028
029/**
030 * Store whether rpc throttle is enabled.
031 * <p>
032 * Notice that, this is stored in master local region so only master can read it. For region
033 * servers, we will publish the change through
034 * {@link org.apache.hadoop.hbase.master.procedure.SwitchRpcThrottleProcedure} and region servers
035 * can also query the flag through rpc request to master.
036 */
037@InterfaceAudience.Private
038public class RpcThrottleStateStore extends BooleanStateStore {
039
040  public static final String RPC_THROTTLE_ZNODE = "zookeeper.znode.quota.rpc.throttle";
041  public static final String RPC_THROTTLE_ZNODE_DEFAULT = "rpc-throttle";
042
043  public static final String STATE_NAME = "rpc-throttle";
044
045  public RpcThrottleStateStore(MasterRegion masterRegion, ZKWatcher watcher, String zkPath)
046    throws IOException, KeeperException, DeserializationException {
047    super(masterRegion, STATE_NAME, watcher, zkPath);
048  }
049
050  @Override
051  protected byte[] toByteArray(boolean on) {
052    return Bytes.toBytes(on);
053  }
054
055  @Override
056  protected boolean parseFrom(byte[] bytes) throws DeserializationException {
057    return Bytes.toBoolean(bytes);
058  }
059
060}