StackProfiler


1   package org.columba.core.util;
2   
3   import java.util.Hashtable  ;
4   import java.util.Iterator  ;
5   import java.util.Vector  ;
6   
7   import org.columba.core.logging.Logging;
8   
9   public class StackProfiler {
10  
11      private static final java.util.logging.Logger   LOG =
12          java.util.logging.Logger.getLogger("org.columba.core.util"); //$NON-NLS-1$
13  
14      /**
15       * keeps a list of profile point ids
16       */
17      private Vector   vector = new Vector  ();
18  
19      /**
20       * key is the id, value is the profile data
21       */
22      private Hashtable   hashtable = new Hashtable  ();
23  
24      /**
25       * current path in simple tree-like hierarchy
26       */
27      private String   currentPath = "";
28  
29      /**
30       * Set new profiling starting point. This is where the time measurment
31       * actually starts.
32       *
33       * @param id
34       *            unique id of profiling point
35       */
36      public void push(String   id) {
37          // abort if not in debugging mode
38          if (Logging.DEBUG == false)
39              return;
40  
41          // current time
42          long currentTime = System.currentTimeMillis();
43  
44          // store profiling point data
45          hashtable.put(id, new ProfileData(id, currentPath,
46                  new Long  (currentTime).longValue()));
47  
48          // this profiling point is parent of the next one
49          currentPath = currentPath + "/" + id;
50  
51          // store id
52          vector.add(id);
53      }
54  
55      /**
56       * Close profiling point. This is where the time measurement actually ends.
57       *
58       * @param id
59       *            unique id of profiling point
60       */
61      public void pop(String   id) {
62          System.out.println("id="+id);
63          // abort if not in debugging mode
64          if (Logging.DEBUG == false)
65              return;
66  
67          if (id == null)
68              throw new IllegalArgumentException  ("id == null");
69  
70          if (hashtable.containsKey(id) == false)
71              throw new IllegalArgumentException  ("id=" + id + " not found");
72  
73          long currentTime = System.currentTimeMillis();
74  
75          ProfileData bean = (ProfileData) hashtable.get(id);
76          bean.endTime = currentTime;
77  
78          String   firstItem = (String  ) vector.get(0);
79          if (firstItem.equals(id)) {
80              // print all collected profile data
81  
82              LOG.info("profiler info:"); //$NON-NLS-1$
83              Iterator   it = vector.listIterator();
84  
85              while (it.hasNext()) {
86                  String   nextId = (String  ) it.next();
87                  printDuration(nextId);
88              }
89          } else {
90              // current path is the parent of the current element
91              int index = currentPath.lastIndexOf("/");
92              currentPath = currentPath.substring(0, index);
93          }
94      }
95  
96      /**
97       * Print debug data.
98       *
99       * @param id
100      *            unique profiling point id
101      */
102     private void printDuration(String   id) {
103         if (id == null)
104             throw new IllegalArgumentException  ("id == null");
105         if (hashtable.containsKey(id) == false)
106             throw new IllegalArgumentException  ("id not found");
107 
108         ProfileData bean = (ProfileData) hashtable.get(id);
109         String   splits[] = bean.path.split("/");
110 
111         for (int i = 0; i < splits.length; i++)
112             System.out.print("  ");
113 
114         long duration = bean.endTime - bean.startTime;
115         LOG.info("[" + duration + "ms] - " + id); //$NON-NLS-2$
116     }
117 
118     /**
119      * Structure containing profiling data.
120      */
121     private class ProfileData {
122         protected String   id;
123 
124         protected String   path;
125 
126         protected long startTime;
127 
128         protected long endTime;
129 
130         protected ProfileData(String   id, String   path, long startTime) {
131             this.id = id;
132             this.path = path;
133             this.startTime = startTime;
134         }
135 
136     }
137 }
138
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