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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  
20  package org.apache.hadoop.hbase.client;
21  
22  
23  import java.io.IOException;
24  
25  import org.apache.hadoop.conf.Configuration;
26  import org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher;
27  
28  /**
29   * We inherit the current ZooKeeperWatcher implementation to change the semantic
30   *  of the close: the new close won't immediately close the connection but
31   *  will have a keep alive. See {@link HConnection}.
32   * This allows to make it available with a consistent interface. The whole
33   *  ZooKeeperWatcher use in HConnection will be then changed to remove the
34   *   watcher part.
35   *
36   * This class is intended to be used internally by HBase classes; but not by
37   * final user code. Hence it's package protected.
38   */
39  class ZooKeeperKeepAliveConnection extends ZooKeeperWatcher{
40    ZooKeeperKeepAliveConnection(
41      Configuration conf, String descriptor,
42      ConnectionManager.HConnectionImplementation conn) throws IOException {
43      super(conf, descriptor, conn);
44    }
45  
46    @Override
47    public void close() {
48      if (this.abortable != null) {
49        ((ConnectionManager.HConnectionImplementation)abortable).releaseZooKeeperWatcher(this);
50      }
51    }
52  
53    void internalClose(){
54      super.close();
55    }
56  }