001/*
002 *
003 * Licensed to the Apache Software Foundation (ASF) under one
004 * or more contributor license agreements.  See the NOTICE file
005 * distributed with this work for additional information
006 * regarding copyright ownership.  The ASF licenses this file
007 * to you under the Apache License, Version 2.0 (the
008 * "License"); you may not use this file except in compliance
009 * with the License.  You may obtain a copy of the License at
010 *
011 *     http://www.apache.org/licenses/LICENSE-2.0
012 *
013 * Unless required by applicable law or agreed to in writing, software
014 * distributed under the License is distributed on an "AS IS" BASIS,
015 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
016 * See the License for the specific language governing permissions and
017 * limitations under the License.
018 */
019package org.apache.hadoop.hbase.replication.regionserver;
020
021import org.apache.hadoop.conf.Configuration;
022import org.apache.hadoop.hbase.replication.ReplicationQueueInfo;
023import org.apache.yetus.audience.InterfaceAudience;
024import org.slf4j.Logger;
025import org.slf4j.LoggerFactory;
026
027/**
028 * Constructs a {@link ReplicationSourceInterface}
029 * Note, not used to create specialized ReplicationSources
030 * @see CatalogReplicationSource
031 */
032@InterfaceAudience.Private
033public final class ReplicationSourceFactory {
034  private static final Logger LOG = LoggerFactory.getLogger(ReplicationSourceFactory.class);
035
036  private ReplicationSourceFactory() {}
037
038  static ReplicationSourceInterface create(Configuration conf, String queueId) {
039    ReplicationQueueInfo replicationQueueInfo = new ReplicationQueueInfo(queueId);
040    boolean isQueueRecovered = replicationQueueInfo.isQueueRecovered();
041    ReplicationSourceInterface src;
042    try {
043      String defaultReplicationSourceImpl =
044          isQueueRecovered ? RecoveredReplicationSource.class.getCanonicalName()
045              : ReplicationSource.class.getCanonicalName();
046      Class<?> c = Class.forName(
047        conf.get("replication.replicationsource.implementation", defaultReplicationSourceImpl));
048      src = c.asSubclass(ReplicationSourceInterface.class).getDeclaredConstructor().newInstance();
049    } catch (Exception e) {
050      LOG.warn("Passed replication source implementation throws errors, "
051          + "defaulting to ReplicationSource",
052        e);
053      src = isQueueRecovered ? new RecoveredReplicationSource() : new ReplicationSource();
054    }
055    return src;
056  }
057}