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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.Supervisor;
import com.yahoo.jrt.Transport;
import com.yahoo.jrt.slobrok.server.Slobrok;
import com.yahoo.concurrent.Timer;
import com.yahoo.concurrent.ManualTimer;
import com.yahoo.messagebus.network.rpc.test.TestServer;
import org.junit.jupiter.api.AfterEach;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import java.util.ArrayList;
import java.util.List;
import static org.junit.jupiter.api.Assertions.*;
/**
* @author Simon Thoresen Hult
*/
public class TargetPoolTestCase {
private Slobrok slobrok;
private List<TestServer> servers;
private Supervisor orb;
@BeforeEach
public void setUp() throws ListenFailedException {
slobrok = new Slobrok();
servers = new ArrayList<>();
orb = new Supervisor(new Transport());
}
@AfterEach
public void tearDown() {
slobrok.stop();
for (TestServer server : servers) {
server.destroy();
}
orb.transport().shutdown().join();
}
@Test
void testConnectionCycling() {
// Necessary setup to be able to resolve targets.
RPCServiceAddress adr1 = registerServer();
Timer timer = new ManualTimer();
RPCTargetPool pool1 = new RPCTargetPool(timer, 0.666, 1);
RPCTarget target1 = pool1.getTarget(orb, adr1);
RPCTarget target2 = pool1.getTarget(orb, adr1);
assertSame(target1, target2);
target1.subRef();
target2.subRef();
RPCTargetPool pool3 = new RPCTargetPool(timer, 0.666, 3);
target1 = pool3.getTarget(orb, adr1);
target2 = pool3.getTarget(orb, adr1);
RPCTarget target3 = pool3.getTarget(orb, adr1);
assertNotSame(target1, target2);
assertNotSame(target2, target3);
assertNotSame(target3, target1);
RPCTarget target4 = pool3.getTarget(orb, adr1);
assertSame(target1, target4);
target1.subRef();
target2.subRef();
target3.subRef();
target4.subRef();
}
@Test
void testConnectionExpire() {
// Necessary setup to be able to resolve targets.
RPCServiceAddress adr1 = registerServer();
RPCServiceAddress adr2 = registerServer();
RPCServiceAddress adr3 = registerServer();
ManualTimer timer = new ManualTimer();
RPCTargetPool pool = new RPCTargetPool(timer, 0.666, 1);
// Assert that all connections expire.
RPCTarget target;
assertNotNull(target = pool.getTarget(orb, adr1));
target.subRef();
assertNotNull(target = pool.getTarget(orb, adr2));
target.subRef();
assertNotNull(target = pool.getTarget(orb, adr3));
target.subRef();
assertEquals(3, pool.size());
for (int i = 0; i < 10; ++i) {
pool.flushTargets(false);
assertEquals(3, pool.size());
}
timer.advance(999);
pool.flushTargets(false);
assertEquals(0, pool.size());
// Assert that only idle connections expire.
assertNotNull(target = pool.getTarget(orb, adr1));
target.subRef();
assertNotNull(target = pool.getTarget(orb, adr2));
target.subRef();
assertNotNull(target = pool.getTarget(orb, adr3));
target.subRef();
assertEquals(3, pool.size());
timer.advance(444);
pool.flushTargets(false);
assertEquals(3, pool.size());
assertNotNull(target = pool.getTarget(orb, adr2));
target.subRef();
assertNotNull(target = pool.getTarget(orb, adr3));
target.subRef();
assertEquals(3, pool.size());
timer.advance(444);
pool.flushTargets(false);
assertEquals(2, pool.size());
assertNotNull(target = pool.getTarget(orb, adr3));
target.subRef();
timer.advance(444);
pool.flushTargets(false);
assertEquals(1, pool.size());
timer.advance(444);
pool.flushTargets(false);
assertEquals(0, pool.size());
// Assert that connections never expire while they are referenced.
assertNotNull(target = pool.getTarget(orb, adr1));
assertEquals(1, pool.size());
for (int i = 0; i < 10; ++i) {
timer.advance(999);
pool.flushTargets(false);
assertEquals(1, pool.size());
}
target.subRef();
timer.advance(999);
pool.flushTargets(false);
assertEquals(0, pool.size());
}
private RPCServiceAddress registerServer() {
servers.add(new TestServer("srv" + servers.size(), null, slobrok, null));
return new RPCServiceAddress("foo/bar", servers.get(servers.size() - 1).mb.getConnectionSpec());
}
}
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