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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.messagebus.network.rpc;
import com.yahoo.jrt.ListenFailedException;
import com.yahoo.jrt.slobrok.server.Slobrok;
import com.yahoo.messagebus.*;
import com.yahoo.messagebus.network.Identity;
import com.yahoo.messagebus.network.rpc.test.TestServer;
import com.yahoo.messagebus.routing.Route;
import com.yahoo.messagebus.test.QueueAdapter;
import com.yahoo.messagebus.test.SimpleMessage;
import org.junit.jupiter.api.Test;
import java.net.UnknownHostException;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertTrue;
/**
* @author havardpe
*/
public class LoadBalanceTestCase {
@Test
void testLoadBalance() throws ListenFailedException {
Slobrok slobrok = new Slobrok();
TestServer src = new TestServer("src", null, slobrok, null);
TestServer dst1 = new TestServer("dst/1", null, slobrok, null);
TestServer dst2 = new TestServer("dst/2", null, slobrok, null);
TestServer dst3 = new TestServer("dst/3", null, slobrok, null);
// set up handlers
final QueueAdapter sq = new QueueAdapter();
SourceSession ss = src.mb.createSourceSession(new SourceSessionParams().setTimeout(600.0).setThrottlePolicy(null)
.setReplyHandler(reply -> {
System.out.println(Thread.currentThread().getName() + ": Reply '" +
((SimpleMessage) reply.getMessage()).getValue() + "' received at source.");
sq.handleReply(reply);
}));
SimpleDestination h1 = new SimpleDestination(dst1.mb, dst1.net.getIdentity());
SimpleDestination h2 = new SimpleDestination(dst2.mb, dst2.net.getIdentity());
SimpleDestination h3 = new SimpleDestination(dst3.mb, dst3.net.getIdentity());
assertTrue(src.waitSlobrok("dst/*/session", 3));
// send messages
int msgCnt = 30; // should be divisible by 3
for (int i = 0; i < msgCnt; ++i) {
ss.send(new SimpleMessage("msg" + i), Route.parse("dst/*/session"));
}
// wait for replies
assertTrue(sq.waitSize(msgCnt, 60));
// check handler message distribution
assertEquals(msgCnt / 3, h1.getCount());
assertEquals(msgCnt / 3, h2.getCount());
assertEquals(msgCnt / 3, h3.getCount());
ss.destroy();
h1.session.destroy();
h2.session.destroy();
h3.session.destroy();
dst3.destroy();
dst2.destroy();
dst1.destroy();
src.destroy();
slobrok.stop();
}
/**
* Implements a simple destination that counts and acknowledges all messages received.
*/
private static class SimpleDestination implements MessageHandler {
final DestinationSession session;
final String ident;
int cnt = 0;
SimpleDestination(MessageBus mb, Identity ident) {
this.session = mb.createDestinationSession("session", true, this);
this.ident = ident.getServicePrefix();
}
@Override
public synchronized void handleMessage(Message msg) {
System.out.println(
Thread.currentThread().getName() + ": " +
"Message '" + ((SimpleMessage)msg).getValue() + "' received at '" + ident + "'.");
session.acknowledge(msg);
++cnt;
}
public synchronized int getCount() {
return cnt;
}
}
}
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