tests/org.simantics.db.tests/src/org/simantics/db/tests/performance/java/FieldAccessTest.java

   1 /*******************************************************************************
   2  * Copyright (c) 2007, 2010 Association for Decentralized Information Management
   3  * in Industry THTH ry.
   4  * All rights reserved. This program and the accompanying materials
   5  * are made available under the terms of the Eclipse Public License v1.0
   6  * which accompanies this distribution, and is available at
   7  * http://www.eclipse.org/legal/epl-v10.html
   8  *
   9  * Contributors:
  10  *     VTT Technical Research Centre of Finland - initial API and implementation
  11  *******************************************************************************/
  12 package org.simantics.db.tests.performance.java;
  13
  14 import org.simantics.db.testing.base.TestCommonPerf;
  15
  16 /**
  17  *
  18  */
  19 public class FieldAccessTest extends TestCommonPerf {
  20
  21         final static class A {
  22
  23                 final private int value;
  24
  25                 public A(int value) {
  26                         this.value = value;
  27                 }
  28
  29                 public int getValue() {
  30                         return value;
  31                 }
  32
  33         }
  34
  35         final static class B {
  36
  37                 final private int value;
  38
  39                 public B(int value) {
  40                         this.value = value;
  41                 }
  42
  43         }
  44
  45         public static int LEN1 = 10000;
  46         public static int LEN2 = 1000000000;
  47
  48         public void test() throws Exception {
  49
  50
  51                 A a = new A(1);
  52                 B b = new B(1);
  53
  54                 int counter = 0;
  55                 long start = System.nanoTime();
  56                 for(int i=0;i<LEN1;i++) counter += a.getValue();
  57                 long duration = System.nanoTime() - start;
  58
  59                 int counter2 = 0;
  60                 long start2 = System.nanoTime();
  61                 for(int i=0;i<LEN1;i++) counter2 += b.value;
  62                 long duration2 = System.nanoTime() - start2;
  63
  64                 int counter3 = 0;
  65                 long start3 = System.nanoTime();
  66                 for(int i=0;i<LEN2;i++) counter3 += a.getValue();
  67                 long duration3 = System.nanoTime() - start3;
  68
  69                 int counter4 = 0;
  70                 long start4 = System.nanoTime();
  71                 for(int i=0;i<LEN2;i++) counter4 += b.value;
  72                 long duration4 = System.nanoTime() - start4;
  73
  74                 System.out.println("Finished in " + 1e-9*duration + "s.");
  75                 System.out.println("Finished in " + 1e-9*duration2 + "s.");
  76                 System.out.println("Finished in " + 1e-9*duration3 + "s.");
  77                 System.out.println("Finished in " + 1e-9*duration4 + "s.");
  78
  79         }
  80
  81 }