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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.util;
20  
21  import org.apache.hadoop.hbase.HConstants;
22  import org.apache.hadoop.hbase.classification.InterfaceAudience;
23  
24   /**
25     * This implementation is not smart and just treats nonce group and nonce as random bits.
26     */
27    // TODO: we could use pure byte arrays, but then we wouldn't be able to use hash map.
28  @InterfaceAudience.Private
29  public class NonceKey {
30    private long group;
31    private long nonce;
32  
33    public NonceKey(long group, long nonce) {
34      assert nonce != HConstants.NO_NONCE;
35      this.group = group;
36      this.nonce = nonce;
37    }
38  
39    @Override
40    public boolean equals(Object obj) {
41      if (obj == null || !(obj instanceof NonceKey)) {
42        return false;
43      }
44      NonceKey nk = ((NonceKey)obj);
45      return this.nonce == nk.nonce && this.group == nk.group;
46    }
47  
48    @Override
49    public int hashCode() {
50      return (int)((group >> 32) ^ group ^ (nonce >> 32) ^ nonce);
51    }
52  
53    @Override
54    public String toString() {
55      return "[" + group + ":" + nonce + "]";
56    }
57  
58    public long getNonceGroup() {
59      return group;
60    }
61  
62    public long getNonce() {
63      return nonce;
64    }
65  }