package org.jgroups.tests;
import org.jgroups.Global;
import org.jgroups.Message;
import org.jgroups.stack.AckSenderWindow;
import org.jgroups.stack.StaticInterval;
import org.jgroups.util.DefaultTimeScheduler;
import org.jgroups.util.TimeScheduler;
import org.jgroups.util.Util;
import org.testng.annotations.DataProvider;
import org.testng.annotations.Test;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
/**
* Test cases for AckSenderWindow
* @author Bela Ban
*/
@Test(groups=Global.FUNCTIONAL,sequential=true)
public class AckSenderWindowTest {
static final int NUM_MSGS=100;
final static long[] xmit_timeouts={1000, 2000, 4000, 8000};
static final double PERCENTAGE_OFF=1.3; // how much can expected xmit_timeout and real timeout differ to still be okay ?
final Map<Long,Entry> msgs=new ConcurrentHashMap<Long,Entry>(); // keys=seqnos (Long), values=Entries
@DataProvider(name="provider")
Object[][] provider() {
final TimeScheduler timer=new DefaultTimeScheduler(10);
return new Object[][] {
{timer,
new AckSenderWindow(new MyRetransmitCommand(), new StaticInterval(xmit_timeouts), timer)}
};
}
@Test(dataProvider="provider")
public void testSimpleAdd(TimeScheduler timer, AckSenderWindow win) throws InterruptedException {
try {
for(int i=1; i <=5; i++)
win.add(i, new Message());
System.out.println("win = " + win);
assert win.size() == 5;
win.ack(1);
System.out.println("win = " + win);
assert win.size() == 4;
win.ack(4);
System.out.println("win = " + win);
assert win.size() == 1;
win.ack(44);
assert win.size() == 0;
}
finally {
timer.stop();
win.reset();
}
}
/** Tests whether retransmits are called at correct times for 1000 messages */
@Test(dataProvider="provider")
public void testRetransmits(TimeScheduler timer, AckSenderWindow win) throws InterruptedException {
int num_non_correct_entries=0;
try {
// 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 all retransmits");
long end_time=System.currentTimeMillis() + 20000L, start=System.currentTimeMillis();
Util.sleep(1000);
while(System.currentTimeMillis() < end_time) {
// 3. Check whether all Entries have correct retransmission times
num_non_correct_entries=checkEntries(false);
if(num_non_correct_entries == 0)
break;
Util.sleep(2000L);
}
System.out.println("-- waited for " + (System.currentTimeMillis() - start) + " ms");
num_non_correct_entries=checkEntries(true);
if(num_non_correct_entries > 0)
System.err.println("Number of incorrect retransmission timeouts: " + num_non_correct_entries);
assert num_non_correct_entries == 0;
}
finally {
timer.stop();
win.reset();
}
}
@Test(dataProvider="provider")
public void testLowest(TimeScheduler timer, AckSenderWindow win) {
try {
for(long i=1; i < 5; i++)
win.add(i, new Message());
System.out.println("win = " + win + ", lowest=" + win.getLowest());
assert win.getLowest() == Global.DEFAULT_FIRST_UNICAST_SEQNO;
win.ack(3);
System.out.println("win = " + win + ", lowest=" + win.getLowest());
assert win.getLowest() == 4;
win.ack(4);
System.out.println("win = " + win + ", lowest=" + win.getLowest());
assert win.getLowest() == 5;
win.ack(2);
assert win.getLowest() == 5;
}
finally {
timer.stop();
win.reset();
}
}
@Test(dataProvider="provider")
public void testGetLowestMessage(TimeScheduler timer, AckSenderWindow win) {
long[] seqnos={1,2,3,4,5};
final Message[] messages=new Message[]{new Message(),new Message(),new Message(),new Message(),new Message()};
try {
for(int i=0; i < seqnos.length; i++) {
win.add(seqnos[i], messages[i]);
}
System.out.println("win = " + win);
Message msg=win.getLowestMessage();
assert messages[0] == msg;
win.ack(2);
msg=win.getLowestMessage();
assert messages[2] == msg;
win.ack(7);
msg=win.getLowestMessage();
assert msg == null;
}
finally {
timer.stop();
win.reset();
}
}
@Test(dataProvider="provider")
public void testAdd(TimeScheduler timer, AckSenderWindow win) {
try {
for(int i=1; i <= 10; i++)
win.add(i, new Message());
System.out.println("win = " + win);
assert win.size() == 10;
win.ack(7);
assert win.size() == 3;
}
finally {
timer.stop();
win.reset();
}
}
@Test(dataProvider="provider")
public void testAck(TimeScheduler timer, AckSenderWindow win) {
try {
for(int i=1; i <= 3; i++)
win.add(i, new Message());
assert win.size() == 3;
win.ack(1);
assert win.size() == 2;
win.ack(2);
assert win.size() == 1;
win.ack(3);
assert win.size() == 0;
}
finally {
timer.stop();
win.reset();
}
}
private int checkEntries(boolean print) {
int retval=0;
Entry entry;
for(long i=0; i < NUM_MSGS; i++) {
entry=msgs.get(new Long(i));
if(!entry.isCorrect(i, print)) {
retval++;
}
}
return retval;
}
static 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, boolean print) {
long t;
long expected;
long diff, delta;
t=first_xmit - start_time;
expected=xmit_timeouts[0];
diff=Math.abs(expected - t);
delta=(long)(expected * PERCENTAGE_OFF);
if(diff <= delta) return true;
t=second_xmit - first_xmit;
expected=xmit_timeouts[1];
diff=Math.abs(expected - t);
delta=(long)(expected * PERCENTAGE_OFF);
if(diff <= delta) return true;
t=third_xmit - second_xmit;
expected=xmit_timeouts[2];
diff=Math.abs(expected - t);
delta=(long)(expected * PERCENTAGE_OFF);
if(diff <= delta) return true;
t=fourth_xmit - third_xmit;
expected=xmit_timeouts[3];
diff=Math.abs(expected - t);
delta=(long)(expected * PERCENTAGE_OFF);
if(diff <= delta) return true;
if(print) {
System.err.println("#" + seqno + ": " + this + ": (" + "entry is more than " +
PERCENTAGE_OFF + " percentage off ");
return false;
}
return true;
}
boolean isCorrect(long seqno) {
return isCorrect(seqno, true);
}
public String toString() {
StringBuilder sb=new StringBuilder();
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=msgs.get(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();
}
}
}
}
}