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.Optional;
021import java.util.function.BiPredicate;
022import org.apache.hadoop.hbase.TableName;
023import org.apache.hadoop.hbase.replication.ReplicationPeerImpl;
024import org.apache.hadoop.hbase.replication.ReplicationPeers;
025import org.apache.hadoop.hbase.replication.SyncReplicationState;
026import org.apache.hadoop.hbase.util.Pair;
027import org.apache.yetus.audience.InterfaceAudience;
028
029@InterfaceAudience.Private
030class SyncReplicationPeerInfoProviderImpl implements SyncReplicationPeerInfoProvider {
031
032  private final ReplicationPeers replicationPeers;
033
034  private final SyncReplicationPeerMappingManager mapping;
035
036  SyncReplicationPeerInfoProviderImpl(ReplicationPeers replicationPeers,
037    SyncReplicationPeerMappingManager mapping) {
038    this.replicationPeers = replicationPeers;
039    this.mapping = mapping;
040  }
041
042  @Override
043  public Optional<Pair<String, String>> getPeerIdAndRemoteWALDir(TableName table) {
044    if (table == null) {
045      return Optional.empty();
046    }
047    String peerId = mapping.getPeerId(table);
048    if (peerId == null) {
049      return Optional.empty();
050    }
051    ReplicationPeerImpl peer = replicationPeers.getPeer(peerId);
052    if (peer == null) {
053      return Optional.empty();
054    }
055    Pair<SyncReplicationState, SyncReplicationState> states =
056      peer.getSyncReplicationStateAndNewState();
057    if (
058      (states.getFirst() == SyncReplicationState.ACTIVE
059        && states.getSecond() == SyncReplicationState.NONE)
060        || (states.getFirst() == SyncReplicationState.DOWNGRADE_ACTIVE
061          && states.getSecond() == SyncReplicationState.ACTIVE)
062    ) {
063      return Optional.of(Pair.newPair(peerId, peer.getPeerConfig().getRemoteWALDir()));
064    } else {
065      return Optional.empty();
066    }
067  }
068
069  @Override
070  public boolean checkState(TableName table,
071    BiPredicate<SyncReplicationState, SyncReplicationState> checker) {
072    String peerId = mapping.getPeerId(table);
073    if (peerId == null) {
074      return false;
075    }
076    ReplicationPeerImpl peer = replicationPeers.getPeer(peerId);
077    if (peer == null) {
078      return false;
079    }
080    Pair<SyncReplicationState, SyncReplicationState> states =
081      peer.getSyncReplicationStateAndNewState();
082    return checker.test(states.getFirst(), states.getSecond());
083  }
084}