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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. class Collection1<T>  {
  8.  
  9. 	private volatile transient int count = 0;
  10.  
  11.     protected synchronized int getCount() {
  12.     	return count;
  13.     }
  14.  
  15. 	public void add(T t) {
  16. 		count++;
  17. 	}
  18.  
  19. 	public void addRange(T[] ts) {
  20. 		for (T t : ts) {  add(t); };
  21. //		count = count + ts.length;
  22. 	}
  23. }
  24.  
  25. class Collection2<T>  extends Collection1<T> {
  26.  
  27. 	protected class AddCounter {
  28. 		int[] addCount = new int[]{-10,-10,-10,-10,-10,-10,-10,-10,-10,-10};
  29. 		int addLevel = -1;
  30. 		int checkLevel = 0;
  31.  
  32. 		protected void beginAdd() {
  33. 			addLevel++;
  34. 			if (addLevel == checkLevel) {
  35. 				addCount[checkLevel] = 0;
  36. 			}
  37. 		}	
  38.  
  39. 		protected void endAdd() {
  40. 			if ((addLevel == checkLevel) && (checkLevel > 0)) {
  41. 				addCount[checkLevel - 1] = addCount[checkLevel - 1] + addCount[checkLevel];
  42. 			}
  43. 			addLevel--;
  44. 		}			
  45.  
  46. 		protected void completeAdd(int count) {
  47. 			if (addLevel == checkLevel) {
  48. 				addCount[checkLevel] = addCount[checkLevel] + count;
  49. 			}
  50. 		}	
  51. 	}	
  52.  
  53. 	protected ThreadLocal<AddCounter> addCounter = new ThreadLocal<AddCounter>() {
  54.             @Override
  55.             protected AddCounter initialValue() {
  56.                 return new AddCounter();
  57.             }          
  58.         };
  59.  
  60. 	public int getAddCount() {
  61. 		AddCounter ac = addCounter.get();
  62. 	   	return ac.addCount[ac.checkLevel];	
  63. 	}
  64.  
  65. 	public void beginAdd() {
  66. 		AddCounter ac = addCounter.get();
  67. 		ac.beginAdd();
  68.      	ac.checkLevel++;
  69. 	}	
  70.  
  71. 	public void endAdd() {
  72. 		AddCounter ac = addCounter.get();
  73. 		ac.checkLevel--;
  74. 		ac.endAdd();
  75. 	}
  76.  
  77. 	@Override
  78. 	public void add(T t) {
  79. 		AddCounter ac = addCounter.get();
  80. 		ac.beginAdd();
  81. 		try {
  82. 			super.add(t);
  83. 			ac.completeAdd(1);
  84. 		} finally {
  85. 			ac.endAdd();	
  86. 		}
  87. 	}
  88.  
  89. 	@Override
  90. 	public void addRange(T[] ts) {
  91. 		AddCounter ac = addCounter.get();
  92. 		ac.beginAdd();
  93. 		try {
  94. 			super.addRange(ts);
  95. 			ac.completeAdd(ts.length);
  96. 		} finally {
  97. 			ac.endAdd();	
  98. 		}
  99. 	}
  100. }
  101.  
  102. /* Name of the class has to be "Main" only if the class is public. */
  103. class Ideone
  104. {
  105. 	public static boolean sleep2(int value) {
  106. 		try {
  107. 			Thread.sleep(value);
  108. 			return false;
  109. 		} catch (InterruptedException e) {
  110. 			return true;
  111. 		}
  112. 	}
  113.  
  114. 	public static void main (String[] args) throws java.lang.Exception
  115. 	{
  116. 		Collection2<Object> cc;
  117.  
  118. 		cc = new Collection2<>();
  119.  
  120.  	 	Thread t1 = new Thread(new Runnable() {
  121.  	 		@Override
  122.     		public void run() {
  123. 				cc.add(null);
  124. 				if (sleep2(10)) { return; }
  125. 				System.out.println("tr1: Count = " + cc.getCount() + ", add count = " + cc.getAddCount());
  126.     		}
  127.  	 	});
  128.  
  129.  
  130.  	 	Thread t2 = new Thread(new Runnable() {
  131.  	 		@Override
  132.     		public void run() {
  133. 				if (sleep2(10)) { return; }
  134. 				cc.addRange(new Object[3]);
  135. 				if (sleep2(10)) { return; }
  136. 				System.out.println("tr2: Count = " + cc.getCount() + ", add count = " + cc.getAddCount());
  137.     		}
  138.  	 	});
  139.  
  140.  	 	Thread t3 = new Thread(new Runnable() {
  141.  	 		@Override
  142.     		public void run() {
  143. 				cc.beginAdd();
  144. 				try {
  145. 					cc.beginAdd();				
  146. 					try {
  147. 						if (sleep2(10)) { return; }
  148. 						cc.add(null);
  149. 						if (sleep2(10)) { return; }
  150. 						cc.add(null);
  151. 					} finally {	
  152. 						cc.endAdd();
  153. 					}
  154. 						System.out.println("tr3 2: Count = " + cc.getCount() + ", add count = " + cc.getAddCount());
  155. 					if (sleep2(10)) { return; }
  156. 					cc.addRange(new Object[5]);
  157. 				} finally {
  158. 					cc.endAdd();
  159. 				}
  160.  
  161. 				System.out.println("tr3 1: Count = " + cc.getCount() + ", add count = " + cc.getAddCount());
  162.     		}
  163.  	 	});
  164.  
  165.  	 	t3.start();
  166.  	 	t2.start();
  167.  	 	t1.start();
  168.  
  169. 	}
  170. }
Success #stdin #stdout 0.04s 711168KB
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tr1: Count = 5, add count = 1
tr3 2: Count = 6, add count = 2
tr2: Count = 6, add count = 3
tr3 1: Count = 11, add count = 7
https://ideone.com/lh56Ds
language:
Java (HotSpot 12)
created:
7 years ago
visibility:
public

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