InputDoubleCheckedLocking


1   ////////////////////////////////////////////////////////////////////////////////
2   // Test case file for checkstyle.
3   // Created: 2001
4   ////////////////////////////////////////////////////////////////////////////////
5   package com.puppycrawl.tools.checkstyle;
6   
7   /**
8    * Test case for detection of double checked locking
9    * @author lkuehne
10   **/
11  class InputDoubleCheckedLocking
12  {
13      static Integer   one = null;
14  
15      private static Integer   getOneCorrect()
16      {
17          synchronized (InputDoubleCheckedLocking.class)
18          {
19              if (one == null)
20              {
21                  one = new Integer  (1);
22              }
23          }
24          return one;
25      }
26  
27      private static Integer   getOneDCL()
28      {
29          if (one == null)
30          {
31              System.out.println("just to make the AST interesting");
32              synchronized (InputDoubleCheckedLocking.class)
33              {
34                  if (one == null)
35                  {
36                      one = new Integer  (1);
37                  }
38              }
39          }
40          return one;
41      }
42  
43      private static Integer   getSimilarToDCL()
44      {
45          // different tests
46          if (one == null)
47          {
48              synchronized (InputDoubleCheckedLocking.class)
49              {
50                  if (one == Integer.valueOf(2))
51                  {
52                      one = new Integer  (1);
53                  }
54              }
55          }
56  
57          // no synchronization
58          if (one == null)
59          {
60              if (one == null)
61              {
62                  one = new Integer  (1);
63              }
64          }
65  
66          // no outer test
67          synchronized (InputDoubleCheckedLocking.class)
68          {
69              if (one == null)
70              {
71                  one = new Integer  (1);
72              }
73          }
74          return one;
75      }
76  
77  }
78
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