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.replication.regionserver;
019
020import java.util.function.BiPredicate;
021import org.apache.hadoop.hbase.replication.SyncReplicationState;
022import org.apache.yetus.audience.InterfaceAudience;
023
024/**
025 * Check whether we need to reject the request from client.
026 */
027@InterfaceAudience.Private
028public class RejectRequestsFromClientStateChecker
029  implements BiPredicate<SyncReplicationState, SyncReplicationState> {
030
031  private static final RejectRequestsFromClientStateChecker INST =
032    new RejectRequestsFromClientStateChecker();
033
034  @Override
035  public boolean test(SyncReplicationState state, SyncReplicationState newState) {
036    // reject requests from client if we are in standby state, or we are going to transit to standby
037    // state.
038    return state == SyncReplicationState.STANDBY || newState == SyncReplicationState.STANDBY;
039  }
040
041  public static RejectRequestsFromClientStateChecker get() {
042    return INST;
043  }
044}