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1   /*
2    *
3    * Licensed to the Apache Software Foundation (ASF) under one
4    * or more contributor license agreements.  See the NOTICE file
5    * distributed with this work for additional information
6    * regarding copyright ownership.  The ASF licenses this file
7    * to you under the Apache License, Version 2.0 (the
8    * "License"); you may not use this file except in compliance
9    * with the License.  You may obtain a copy of the License at
10   *
11   *     http://www.apache.org/licenses/LICENSE-2.0
12   *
13   * Unless required by applicable law or agreed to in writing, software
14   * distributed under the License is distributed on an "AS IS" BASIS,
15   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16   * See the License for the specific language governing permissions and
17   * limitations under the License.
18   */
19  package org.apache.hadoop.hbase.replication;
20  
21  import java.util.List;
22  
23  import org.apache.hadoop.hbase.classification.InterfaceAudience;
24  import org.apache.hadoop.conf.Configuration;
25  import org.apache.hadoop.hbase.Abortable;
26  import org.apache.hadoop.hbase.zookeeper.ZKUtil;
27  import org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher;
28  import org.apache.zookeeper.KeeperException;
29  
30  @InterfaceAudience.Private
31  public class ReplicationQueuesClientZKImpl extends ReplicationStateZKBase implements
32      ReplicationQueuesClient {
33  
34    public ReplicationQueuesClientZKImpl(final ZooKeeperWatcher zk, Configuration conf,
35        Abortable abortable) {
36      super(zk, conf, abortable);
37    }
38  
39    @Override
40    public void init() throws ReplicationException {
41      try {
42        ZKUtil.createWithParents(this.zookeeper, this.queuesZNode);
43      } catch (KeeperException e) {
44        throw new ReplicationException("Internal error while initializing a queues client", e);
45      }
46    }
47  
48    @Override
49    public List<String> getLogsInQueue(String serverName, String queueId) {
50      String znode = ZKUtil.joinZNode(this.queuesZNode, serverName);
51      znode = ZKUtil.joinZNode(znode, queueId);
52      List<String> result = null;
53      try {
54        result = ZKUtil.listChildrenNoWatch(this.zookeeper, znode);
55      } catch (KeeperException e) {
56        this.abortable.abort("Failed to get list of hlogs for queueId=" + queueId
57            + " and serverName=" + serverName, e);
58      }
59      return result;
60    }
61  
62    @Override
63    public List<String> getAllQueues(String serverName) {
64      String znode = ZKUtil.joinZNode(this.queuesZNode, serverName);
65      List<String> result = null;
66      try {
67        result = ZKUtil.listChildrenNoWatch(this.zookeeper, znode);
68      } catch (KeeperException e) {
69        this.abortable.abort("Failed to get list of queues for serverName=" + serverName, e);
70      }
71      return result;
72    }
73  
74  }