: If you want to experiment, a really trivial test is below -- on my system, 
: there is a ~5 second gap between each pair of "INIT" and "H1" timestamps, 
: but no other odd gaps in subsequent timestamps -- suggesting no caching of 
: DNS per hostname, but that the URL class doesn't "re-lookup" on subsequent 
: hashCode() calls.

Or maybe i could actually cut & paste the test this time...


import java.net.URL;
import org.apache.lucene.util.LuceneTestCase;
public class TestURLDNSAbsurdity extends LuceneTestCase {
  
  public void testHowSlowCanYouGo() throws Exception {
    go("1");
    go("2");
  }
  public void go(String s) throws Exception {
    System.out.println(s + " PRE: " + System.currentTimeMillis());
    URL url = new URL("http://example.com/";);
    System.out.println(s + "INIT: " + System.currentTimeMillis());
    int h1 = url.hashCode();
    System.out.println(s + "  H1: " + System.currentTimeMillis());
    int h2 = url.hashCode();
    System.out.println(s + "  H2: " + System.currentTimeMillis());
    boolean e1 = url.equals(this);
    System.out.println(s + "  E1: " + System.currentTimeMillis());
    boolean e2 = url.equals(this);
    System.out.println(s + "  E2: " + System.currentTimeMillis());
    assertEquals(h1,h2);
    assertEquals(e1,e2);
  }
}

        ...

   [junit4] Started J0 PID(31843@frisbee).
   [junit4] Suite: org.apache.solr.util.TestURLDNSAbsurdity
   [junit4]   1> 1 PRE: 1379107971313
   [junit4]   1> 1INIT: 1379107971314
   [junit4]   1> 1  H1: 1379107976449
   [junit4]   1> 1  H2: 1379107976449
   [junit4]   1> 1  E1: 1379107976449
   [junit4]   1> 1  E2: 1379107976449
   [junit4]   1> 2 PRE: 1379107976450
   [junit4]   1> 2INIT: 1379107976450
   [junit4]   1> 2  H1: 1379107981510
   [junit4]   1> 2  H2: 1379107981510
   [junit4]   1> 2  E1: 1379107981510
   [junit4]   1> 2  E2: 1379107981510
   [junit4] OK      10.3s | TestURLDNSAbsurdity.testHowSlowCanYouGo




-Hoss

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