bundles/org.simantics.databoard/scratch/org/simantics/databoard/tests/StringUTFTest.java

   1 package org.simantics.databoard.tests;
   2
   3 import java.io.ByteArrayInputStream;
   4 import java.io.ByteArrayOutputStream;
   5 import java.io.DataInputStream;
   6 import java.io.DataOutputStream;
   7 import java.nio.charset.Charset;
   8
   9 import org.simantics.databoard.Bindings;
  10 import org.simantics.databoard.binding.StringBinding;
  11
  12 /**
  13  *
  14  * @author Toni Kalajainen <toni.kalajainen@iki.fi>
  15  */
  16 public class StringUTFTest {
  17
  18         public static void main(String[] args) throws Exception {
  19
  20                 StringBinding b = Bindings.STRING;
  21                 int c = 10000;
  22                 String[] strs = new String[c];
  23                 for (int i=0; i<c; i++) strs[i] = (String) b.createRandom(i);
  24
  25
  26                 {
  27                         ByteArrayOutputStream baos = new ByteArrayOutputStream( 10*1024*1024 );
  28                         DataOutputStream dos = new DataOutputStream( baos );
  29                         System.gc();
  30                         long x = System.nanoTime();
  31                         for (int i=0; i<c; i++) {
  32                                 dos.writeUTF(strs[i]);
  33                         }
  34                         long y = System.nanoTime() - x;
  35                         System.out.println("DataOutputStream.writeUTF: "+y);
  36
  37                         byte[] data = baos.toByteArray();
  38                         DataInputStream dis = new DataInputStream( new ByteArrayInputStream( data ) );
  39                         x = System.nanoTime();
  40                         for (int i=0; i<c; i++) {
  41                                 dis.readUTF();
  42                         }
  43                         y = System.nanoTime() - x;
  44                         System.out.println("DataOutputStream.readUTF : "+y);
  45                 }
  46
  47                 {
  48                         Charset cs = Charset.forName("UTF8");
  49                         ByteArrayOutputStream baos = new ByteArrayOutputStream( 10*1024*1024 );
  50                         DataOutputStream dos = new DataOutputStream( baos );
  51                         System.gc();
  52                         long x = System.nanoTime();
  53                         for (int i=0; i<c; i++) {
  54                                 byte[] data = strs[i].getBytes(cs);
  55                                 dos.writeInt(data.length);
  56                                 dos.write(data);
  57                         }
  58                         long y = System.nanoTime() - x;
  59                         System.out.println("String#getBytes(cs)      : "+y);
  60
  61
  62                         byte[] strData = new byte[1024];
  63                         byte[] data = baos.toByteArray();
  64                         DataInputStream dis = new DataInputStream( new ByteArrayInputStream( data ) );
  65                         x = System.nanoTime();
  66                         for (int i=0; i<c; i++) {
  67                                 int len = dis.readInt();
  68                                 dis.read(strData, 0, len);
  69                                 new String(strData, cs);
  70                         }
  71                         y = System.nanoTime() - x;
  72                         System.out.println("new String(byte[], cs)   : "+y);
  73                 }
  74
  75
  76         }
  77
  78 }