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 org.apache.hadoop.conf.Configuration;
021import org.apache.hadoop.hbase.replication.ReplicationQueueId;
022import org.apache.yetus.audience.InterfaceAudience;
023import org.slf4j.Logger;
024import org.slf4j.LoggerFactory;
025
026/**
027 * Constructs a {@link ReplicationSourceInterface} Note, not used to create specialized
028 * ReplicationSources
029 */
030@InterfaceAudience.Private
031public final class ReplicationSourceFactory {
032  private static final Logger LOG = LoggerFactory.getLogger(ReplicationSourceFactory.class);
033
034  private ReplicationSourceFactory() {
035  }
036
037  static ReplicationSourceInterface create(Configuration conf, ReplicationQueueId queueId) {
038    boolean isQueueRecovered = queueId.isRecovered();
039    ReplicationSourceInterface src;
040    try {
041      String defaultReplicationSourceImpl = isQueueRecovered
042        ? RecoveredReplicationSource.class.getCanonicalName()
043        : ReplicationSource.class.getCanonicalName();
044      Class<?> c = Class.forName(
045        conf.get("replication.replicationsource.implementation", defaultReplicationSourceImpl));
046      src = c.asSubclass(ReplicationSourceInterface.class).getDeclaredConstructor().newInstance();
047    } catch (Exception e) {
048      LOG.warn("Passed replication source implementation throws errors, "
049        + "defaulting to ReplicationSource", e);
050      src = isQueueRecovered ? new RecoveredReplicationSource() : new ReplicationSource();
051    }
052    return src;
053  }
054}