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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;
import com.yahoo.messagebus.test.SimpleMessage;
import org.junit.jupiter.api.Test;
import java.util.LinkedList;
import java.util.Queue;
import java.util.Set;
import java.util.concurrent.ConcurrentLinkedQueue;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.Executor;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicReference;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertNotNull;
import static org.junit.jupiter.api.Assertions.assertTrue;
/**
* @author Simon Thoresen Hult
*/
public class SequencerTestCase {
@Test
void testSyncNone() {
TestQueue src = new TestQueue();
TestQueue dst = new TestQueue();
QueueSender sender = new QueueSender(dst);
Sequencer seq = new Sequencer(sender);
seq.handleMessage(src.createMessage(false, 0));
seq.handleMessage(src.createMessage(false, 0));
seq.handleMessage(src.createMessage(false, 0));
seq.handleMessage(src.createMessage(false, 0));
seq.handleMessage(src.createMessage(false, 0));
assertEquals(0, src.size());
assertEquals(5, dst.size());
dst.replyNext();
dst.replyNext();
dst.replyNext();
dst.replyNext();
dst.replyNext();
assertEquals(5, src.size());
assertEquals(0, dst.size());
src.checkReply(false, 0);
src.checkReply(false, 0);
src.checkReply(false, 0);
src.checkReply(false, 0);
src.checkReply(false, 0);
assertEquals(0, src.size());
assertEquals(0, dst.size());
}
@Test
void testSyncId() {
TestQueue src = new TestQueue();
TestQueue dst = new TestQueue();
QueueSender sender = new QueueSender(dst);
Sequencer seq = new Sequencer(sender);
seq.handleMessage(src.createMessage(true, 1L));
seq.handleMessage(src.createMessage(true, 2L));
seq.handleMessage(src.createMessage(true, 3L));
seq.handleMessage(src.createMessage(true, 4L));
seq.handleMessage(src.createMessage(true, 5L));
assertEquals(0, src.size());
assertEquals(5, dst.size());
seq.handleMessage(src.createMessage(true, 1L));
seq.handleMessage(src.createMessage(true, 5L));
seq.handleMessage(src.createMessage(true, 2L));
seq.handleMessage(src.createMessage(true, 10L));
seq.handleMessage(src.createMessage(true, 4L));
seq.handleMessage(src.createMessage(true, 3L));
assertEquals(0, src.size());
assertEquals(6, dst.size());
dst.replyNext();
dst.replyNext();
dst.replyNext();
dst.replyNext();
dst.replyNext();
assertEquals(5, src.size());
assertEquals(6, dst.size());
dst.replyNext();
dst.replyNext();
dst.replyNext();
dst.replyNext();
dst.replyNext();
dst.replyNext();
assertEquals(11, src.size());
assertEquals(0, dst.size());
src.checkReply(true, 1);
src.checkReply(true, 2);
src.checkReply(true, 3);
src.checkReply(true, 4);
src.checkReply(true, 5);
src.checkReply(true, 10);
src.checkReply(true, 1);
src.checkReply(true, 2);
src.checkReply(true, 3);
src.checkReply(true, 4);
src.checkReply(true, 5);
assertEquals(0, src.size());
assertEquals(0, dst.size());
}
@Test
void testRecursiveSending() throws InterruptedException {
// This test queues up a lot of replies, and then has them all ready to return at once.
int n = 10000;
CountDownLatch latch = new CountDownLatch(n);
CountDownLatch started = new CountDownLatch(1);
AtomicReference<Reply> waiting = new AtomicReference<>();
Executor executor = Executors.newSingleThreadExecutor();
MessageHandler sender = message -> {
Runnable task = () -> {
Reply reply = new EmptyReply();
reply.swapState(message);
reply.setMessage(message);
if (waiting.compareAndSet(null, reply)) started.countDown();
else reply.popHandler().handleReply(reply);
};
if (Math.random() < 0.5) executor.execute(task); // Usually, RPC thread runs this.
else task.run(); // But on, e.g., timeouts, it runs in the caller thread instead.
};
Queue<Message> answered = new ConcurrentLinkedQueue<>();
ReplyHandler handler = reply -> {
answered.add(reply.getMessage());
latch.countDown();
};
Messenger messenger = new Messenger();
messenger.start();
Sequencer sequencer = new Sequencer(sender, messenger); // Not using the messenger results in a stack overflow error.
Queue<Message> sent = new ConcurrentLinkedQueue<>();
for (int i = 0; i < 10000; i++) {
Message message = new MyMessage(true, 1);
message.pushHandler(handler);
sequencer.handleMessage(message);
sent.add(message);
}
assertTrue(started.await(10, TimeUnit.SECONDS));
waiting.get().popHandler().handleReply(waiting.get());
assertTrue(latch.await(10, TimeUnit.SECONDS), "All messages should obtain a reply within 10s");
assertEquals(Set.copyOf(sent), Set.copyOf(answered)); // Order is not guaranteed at all!
messenger.destroy();
}
private static class TestQueue extends LinkedList<Routable> implements ReplyHandler {
void checkReply(boolean hasSeqId, long seqId) {
if (size() == 0) {
throw new IllegalStateException("No routable in queue.");
}
Routable obj = remove();
assertTrue(obj instanceof Reply);
Reply reply = (Reply)obj;
Message msg = reply.getMessage();
assertNotNull(msg);
assertEquals(hasSeqId, msg.hasSequenceId());
if (hasSeqId) {
assertEquals(seqId, msg.getSequenceId());
}
}
public void handleReply(Reply reply) {
add(reply);
}
void replyNext() {
Routable obj = remove();
assertTrue(obj instanceof Message);
Message msg = (Message)obj;
Reply reply = new EmptyReply();
reply.swapState(msg);
reply.setMessage(msg);
ReplyHandler handler = reply.popHandler();
handler.handleReply(reply);
}
Message createMessage(final boolean hasSeqId, final long seqId) {
Message ret = new MyMessage(hasSeqId, seqId);
ret.pushHandler(this);
return ret;
}
}
private static class QueueSender implements MessageHandler {
Queue<Routable> queue;
QueueSender(Queue<Routable> queue) {
this.queue = queue;
}
@Override
public void handleMessage(Message msg) {
queue.offer(msg);
}
}
private static class MyMessage extends SimpleMessage {
final boolean hasSeqId;
final long seqId;
MyMessage(boolean hasSeqId, long seqId) {
super("foo");
this.hasSeqId = hasSeqId;
this.seqId = seqId;
}
@Override
public boolean hasSequenceId() {
return hasSeqId;
}
@Override
public long getSequenceId() {
return seqId;
}
}
}
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