cvs commit: jakarta-avalon-excalibur/src/test ListTest.java

[bloritsch]

bloritsch    02/01/17 13:08:46

  Added:       src/test ListTest.java
  Log:
  simple performance test class to demonstrate how efficient the new buffer 
implementations are compared to Lists when used for the same purpose
  
  Revision  Changes    Path
  1.1                  jakarta-avalon-excalibur/src/test/ListTest.java
  
  Index: ListTest.java
  ===================================================================
  import java.util.*;
  import org.apache.avalon.excalibur.collections.VariableSizeBuffer;
  import org.apache.avalon.excalibur.collections.FixedSizeBuffer;
  
  public class ListTest
  {
   public static void main(String[] args)
   {
    int lInitialSize = Integer.parseInt(args[0]);
    int lIterations = Integer.parseInt(args[1]);
    ArrayList lArrayList = new ArrayList(lInitialSize + 1);
    LinkedList lLinkedList = new LinkedList();
    VariableSizeBuffer lVariableSizeBuffer = new 
VariableSizeBuffer(lInitialSize + 1);
    FixedSizeBuffer lFixedSizeBuffer = new FixedSizeBuffer(lInitialSize + 1);
    long lBegin, lEnd;
  
    for (int i = 0; i < lInitialSize; i++)
    {
     lArrayList.add(new Integer(i));
     lLinkedList.add(new Integer(i));
     lVariableSizeBuffer.add(new Integer(i));
     lFixedSizeBuffer.add(new Integer(i));
    }
  
    lBegin = System.currentTimeMillis();
    for (int i = 0; i < lIterations; i++)
    {
     lArrayList.add(0, new Integer(i));  // Add to the head
     lArrayList.remove(lInitialSize);  // Remove from the tail
    }
    lEnd = System.currentTimeMillis();
    System.out.println("Time: " + (lEnd - lBegin));
  
    lBegin = System.currentTimeMillis();
    for (int i = 0; i < lIterations; i++)
    {
     lLinkedList.addFirst(new Integer(i));  // Add to the head
     lLinkedList.removeLast();  // Remove from the tail
    }
    lEnd = System.currentTimeMillis();
    System.out.println("Time: " + (lEnd - lBegin));
  
    lBegin = System.currentTimeMillis();
    for (int i = 0; i < lIterations; i++)
    {
     lVariableSizeBuffer.add( new Integer(i) );  // Add to the head
     lVariableSizeBuffer.remove();  // Remove from the tail
    }
    lEnd = System.currentTimeMillis();
    System.out.println("Time: " + (lEnd - lBegin));
  
    lBegin = System.currentTimeMillis();
    for (int i = 0; i < lIterations; i++)
    {
     lFixedSizeBuffer.add( new Integer(i) );  // Add to the head
     lFixedSizeBuffer.remove();  // Remove from the tail
    }
    lEnd = System.currentTimeMillis();
    System.out.println("Time: " + (lEnd - lBegin));
   }
  }
  
  
  

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