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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.search.cluster.test;
import com.yahoo.component.ComponentId;
import com.yahoo.concurrent.DaemonThreadFactory;
import com.yahoo.prelude.Ping;
import com.yahoo.prelude.Pong;
import com.yahoo.search.Query;
import com.yahoo.search.Result;
import com.yahoo.search.cluster.ClusterSearcher;
import com.yahoo.search.cluster.Hasher;
import com.yahoo.search.result.ErrorMessage;
import com.yahoo.search.result.Hit;
import com.yahoo.search.searchchain.Execution;
import org.junit.jupiter.api.Test;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.Executors;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertNull;
/**
* @author bratseth
*/
public class ClusteredConnectionTestCase {
@Test
void testClustering() {
Connection connection0 = new Connection("0");
Connection connection1 = new Connection("1");
Connection connection2 = new Connection("2");
List<Connection> connections = new ArrayList<>();
connections.add(connection0);
connections.add(connection1);
connections.add(connection2);
MyBackend myBackend = new MyBackend(new ComponentId("test"), connections);
Result r;
r = new Execution(myBackend, Execution.Context.createContextStub()).search(new SimpleQuery(0));
assertEquals("from:0", r.hits().get(0).getId().stringValue());
r = new Execution(myBackend, Execution.Context.createContextStub()).search(new SimpleQuery(1));
assertEquals("from:2", r.hits().get(0).getId().stringValue());
r = new Execution(myBackend, Execution.Context.createContextStub()).search(new SimpleQuery(2));
assertEquals("from:1", r.hits().get(0).getId().stringValue());
r = new Execution(myBackend, Execution.Context.createContextStub()).search(new SimpleQuery(3));
assertEquals("from:0", r.hits().get(0).getId().stringValue());
connection2.setInService(false);
r = new Execution(myBackend, Execution.Context.createContextStub()).search(new SimpleQuery(0));
assertEquals("from:0", r.hits().get(0).getId().stringValue());
r = new Execution(myBackend, Execution.Context.createContextStub()).search(new SimpleQuery(1));
assertEquals("from:0", r.hits().get(0).getId().stringValue());
r = new Execution(myBackend, Execution.Context.createContextStub()).search(new SimpleQuery(2));
assertEquals("from:1", r.hits().get(0).getId().stringValue());
r = new Execution(myBackend, Execution.Context.createContextStub()).search(new SimpleQuery(3));
assertEquals("from:0", r.hits().get(0).getId().stringValue());
connection1.setInService(false);
r = new Execution(myBackend, Execution.Context.createContextStub()).search(new SimpleQuery(0));
assertEquals("from:0", r.hits().get(0).getId().stringValue());
r = new Execution(myBackend, Execution.Context.createContextStub()).search(new SimpleQuery(1));
assertEquals("from:0", r.hits().get(0).getId().stringValue());
r = new Execution(myBackend, Execution.Context.createContextStub()).search(new SimpleQuery(2));
assertEquals("from:0", r.hits().get(0).getId().stringValue());
r = new Execution(myBackend, Execution.Context.createContextStub()).search(new SimpleQuery(3));
assertEquals("from:0", r.hits().get(0).getId().stringValue());
connection0.setInService(false);
r = new Execution(myBackend, Execution.Context.createContextStub()).search(new SimpleQuery(0));
assertEquals("Failed calling connection '2' in searcher 'test' for query 'NULL': Connection failed",
r.hits().getError().getDetailedMessage());
connection0.setInService(true);
r = new Execution(myBackend, Execution.Context.createContextStub()).search(new SimpleQuery(0));
assertEquals("from:0", r.hits().get(0).getId().stringValue());
r = new Execution(myBackend, Execution.Context.createContextStub()).search(new SimpleQuery(1));
assertEquals("from:0", r.hits().get(0).getId().stringValue());
r = new Execution(myBackend, Execution.Context.createContextStub()).search(new SimpleQuery(2));
assertEquals("from:0", r.hits().get(0).getId().stringValue());
r = new Execution(myBackend, Execution.Context.createContextStub()).search(new SimpleQuery(3));
assertEquals("from:0", r.hits().get(0).getId().stringValue());
connection1.setInService(true);
connection2.setInService(true);
r = new Execution(myBackend, Execution.Context.createContextStub()).search(new SimpleQuery(0));
assertEquals("from:0", r.hits().get(0).getId().stringValue());
r = new Execution(myBackend, Execution.Context.createContextStub()).search(new SimpleQuery(1));
assertEquals("from:2", r.hits().get(0).getId().stringValue());
r = new Execution(myBackend, Execution.Context.createContextStub()).search(new SimpleQuery(2));
assertEquals("from:1", r.hits().get(0).getId().stringValue());
r = new Execution(myBackend, Execution.Context.createContextStub()).search(new SimpleQuery(3));
assertEquals("from:0", r.hits().get(0).getId().stringValue());
}
@Test
void testClusteringWithPing() {
Connection connection0 = new Connection("0");
Connection connection1 = new Connection("1");
Connection connection2 = new Connection("2");
List<Connection> connections = new ArrayList<>();
connections.add(connection0);
connections.add(connection1);
connections.add(connection2);
MyBackend myBackend = new MyBackend(new ComponentId("test"), connections);
Result r;
// Note that we cannot make any successful queries here or we have to wait 10 seconds for
// the traffic monitor to agree that these nodes are really not responding
connection2.setInService(false);
connection1.setInService(false);
connection0.setInService(false);
forcePing(myBackend);
r = new Execution(myBackend, Execution.Context.createContextStub()).search(new SimpleQuery(0));
assertEquals("No backends in service. Try later", r.hits().getError().getMessage());
connection2.setInService(true);
connection1.setInService(true);
connection0.setInService(true);
forcePing(myBackend);
r = new Execution(myBackend, Execution.Context.createContextStub()).search(new SimpleQuery(0));
assertNull(r.hits().getError());
}
private void forcePing(MyBackend myBackend) {
myBackend.getMonitor().ping(Executors.newCachedThreadPool(new DaemonThreadFactory()));
Thread.yield();
}
/** Represents a connection, e.g over http, in this test */
private static class Connection {
private final String id;
private boolean inService = true;
public Connection(String id) {
this.id=id;
}
/** This is used for both fill, pings and queries */
public String getResponse() {
if ( ! inService) throw new RuntimeException("Connection failed");
return id;
}
public void setInService(boolean inservice) {
this.inService = inservice;
}
public String toString() {
return "connection '" + id + "'";
}
}
/**
* This is the kind of searcher which will be implemented by those who wish to create a searcher which is a
* client to a clustered service.
* The goal is to make writing this correctly as simple as possible.
*/
private static class MyBackend extends ClusterSearcher<Connection> {
public MyBackend(ComponentId componentId, List<Connection> connections) {
super(componentId,connections, new Hasher<>(), false, false);
}
@Override
public Result search(Query query,Execution execution, Connection connection) {
Result result = new Result(query);
result.hits().add(new Hit("from:" + connection.getResponse()));
return result;
}
@Override
public void fill(Result result,String summary, Execution execution, Connection connection) {
result.hits().get(0).fields().put("filled",connection.getResponse());
}
@Override
public Pong ping(Ping ping,Connection connection) {
if (connection.getResponse() != null)
return new Pong();
else
return new Pong(ErrorMessage.createBackendCommunicationError("No ping response from '" + connection + "'"));
}
}
/** A query with a predictable hash function */
private static class SimpleQuery extends Query {
int hashValue;
public SimpleQuery(int hashValue) {
this.hashValue = hashValue;
this.setTimeout(50);
}
@Override
public int hashCode() {
return hashValue;
}
@Override
public long getTimeout() {
return 5000;
}
}
}
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