// $Id: AckSenderWindowTest.java,v 1.5 2005/05/30 16:15:05 belaban Exp $
package org.jgroups.tests;
import junit.framework.Test;
import junit.framework.TestCase;
import junit.framework.TestSuite;
import org.jgroups.Message;
import org.jgroups.stack.AckSenderWindow;
import org.jgroups.util.Util;
import java.util.HashMap;
/**
* Test cases for AckSenderWindow
* @author Bela Ban
*/
public class AckSenderWindowTest extends TestCase {
AckSenderWindow win=null;
final int NUM_MSGS=100;
long[] xmit_timeouts={1000, 2000, 4000, 8000};
double PERCENTAGE_OFF=1.3; // how much can expected xmit_timeout and real timeout differ to still be okay ?
HashMap msgs=new HashMap(); // keys=seqnos (Long), values=Entries
class Entry {
long start_time=0; // time message was added
long first_xmit=0; // time between start_time and first_xmit should be ca. 1000ms
long second_xmit=0; // time between first_xmit and second_xmit should be ca. 2000ms
long third_xmit=0; // time between third_xmit and second_xmit should be ca. 4000ms
long fourth_xmit=0; // time between third_xmit and second_xmit should be ca. 8000ms
Entry() {
start_time=System.currentTimeMillis();
}
/** Entry is correct if xmit timeouts are not more than 30% off the mark */
boolean isCorrect(long seqno) {
long t;
long expected;
long diff, delta;
boolean off=false;
t=first_xmit - start_time;
expected=xmit_timeouts[0];
diff=Math.abs(expected - t);
delta=(long)(expected * PERCENTAGE_OFF);
if(diff >= delta) off=true;
t=second_xmit - first_xmit;
expected=xmit_timeouts[1];
diff=Math.abs(expected - t);
delta=(long)(expected * PERCENTAGE_OFF);
if(diff >= delta) off=true;
t=third_xmit - second_xmit;
expected=xmit_timeouts[2];
diff=Math.abs(expected - t);
delta=(long)(expected * PERCENTAGE_OFF);
if(diff >= delta) off=true;
t=fourth_xmit - third_xmit;
expected=xmit_timeouts[3];
diff=Math.abs(expected - t);
delta=(long)(expected * PERCENTAGE_OFF);
if(diff >= delta) off=true;
if(off) {
System.err.println("#" + seqno + ": " + this + ": (" + "entry is more than " +
PERCENTAGE_OFF + " percentage off ");
return false;
}
return true;
}
public String toString() {
StringBuffer sb=new StringBuffer();
sb.append(first_xmit - start_time).append(", ").append(second_xmit-first_xmit).append(", ");
sb.append(third_xmit-second_xmit).append(", ").append(fourth_xmit-third_xmit);
return sb.toString();
}
}
class MyRetransmitCommand implements AckSenderWindow.RetransmitCommand {
public void retransmit(long seqno, Message msg) {
Entry entry=(Entry)msgs.get(new Long(seqno));
// System.out.println(" -- retransmit(" + seqno + ")");
if(entry != null) {
if(entry.first_xmit == 0) {
entry.first_xmit=System.currentTimeMillis();
return;
}
if(entry.second_xmit == 0) {
entry.second_xmit=System.currentTimeMillis();
return;
}
if(entry.third_xmit == 0) {
entry.third_xmit=System.currentTimeMillis();
return;
}
if(entry.fourth_xmit == 0) {
entry.fourth_xmit=System.currentTimeMillis();
return;
}
}
}
}
public AckSenderWindowTest(String name) { super(name); }
/** Tests whether retransmits are called at correct times for 1000 messages */
public void testRetransmits() {
Entry entry;
int num_non_correct_entries=0;
win=new AckSenderWindow(new MyRetransmitCommand(), xmit_timeouts);
// 1. Send NUM_MSGS messages:
System.out.println("-- sending " + NUM_MSGS + " messages:");
for(long i=0; i < NUM_MSGS; i++) {
msgs.put(new Long(i), new Entry());
win.add(i, new Message());
}
System.out.println("-- done");
// 2. Wait for at least 4 xmits/msg: total of 1000 + 2000 + 4000 + 8000ms = 15000ms; wait for 20000ms
System.out.println("-- waiting for 20 secs for all retransmits");
Util.sleep(20000);
// 3. Check whether all Entries have correct retransmission times
for(long i=0; i < NUM_MSGS; i++) {
entry=(Entry)msgs.get(new Long(i));
if(!entry.isCorrect(i)) {
num_non_correct_entries++;
}
}
if(num_non_correct_entries > 0)
System.err.println("Number of incorrect retransmission timeouts: " + num_non_correct_entries);
assertTrue(num_non_correct_entries == 0);
win.reset();
}
public static Test suite() {
TestSuite suite;
suite = new TestSuite(AckSenderWindowTest.class);
return(suite);
}
public static void main(String[] args) {
String[] name = {AckSenderWindowTest.class.getName()};
junit.textui.TestRunner.main(name);
}
}