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ClusterDiscoveryIT.java
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ClusterDiscoveryIT.java
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/*
* Copyright (c) 2002-2016 "Neo Technology,"
* Network Engine for Objects in Lund AB [http://neotechnology.com]
*
* This file is part of Neo4j.
*
* Neo4j is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.neo4j.causalclustering.scenarios;
import org.junit.Rule;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;
import java.util.Arrays;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import org.neo4j.causalclustering.discovery.Cluster;
import org.neo4j.causalclustering.discovery.procedures.GetServersProcedure;
import org.neo4j.kernel.api.KernelAPI;
import org.neo4j.kernel.api.KernelTransaction;
import org.neo4j.kernel.api.KernelTransaction.Type;
import org.neo4j.kernel.api.Statement;
import org.neo4j.kernel.api.exceptions.ProcedureException;
import org.neo4j.kernel.api.exceptions.TransactionFailureException;
import org.neo4j.kernel.api.security.AnonymousContext;
import org.neo4j.kernel.configuration.Settings;
import org.neo4j.kernel.impl.factory.GraphDatabaseFacade;
import org.neo4j.test.causalclustering.ClusterRule;
import static java.util.Collections.singletonMap;
import static org.hamcrest.MatcherAssert.assertThat;
import static org.hamcrest.Matchers.containsString;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.fail;
import static org.neo4j.causalclustering.core.CausalClusteringSettings.cluster_allow_reads_on_followers;
import static org.neo4j.helpers.collection.Iterators.asList;
import static org.neo4j.kernel.api.proc.ProcedureSignature.procedureName;
@RunWith( Parameterized.class )
public class ClusterDiscoveryIT
{
@Parameterized.Parameter( 0 )
public String ignored; // <- JUnit is happy only if this is here!
@Parameterized.Parameter( 1 )
public Map<String,String> config;
@Parameterized.Parameter( 2 )
public boolean expectFollowersAsReadEndPoints;
@Parameterized.Parameters( name = "{0}")
public static Collection<Object[]> params()
{
return Arrays.asList(
new Object[]{"with followers as read end points",
singletonMap( cluster_allow_reads_on_followers.name(), Settings.TRUE ), true},
new Object[]{"no followers as read end points",
singletonMap( cluster_allow_reads_on_followers.name(), Settings.FALSE ), false}
);
}
@Rule
public final ClusterRule clusterRule = new ClusterRule( getClass() ).withNumberOfCoreMembers( 3 );
@Test
public void shouldFindReadWriteAndRouteServers() throws Exception
{
// when
Cluster cluster = clusterRule.withSharedCoreParams( config ).withNumberOfReadReplicas( 1 ).startCluster();
// then
int cores = cluster.coreMembers().size();
int readReplicas = cluster.readReplicas().size();
int readEndPoints = expectFollowersAsReadEndPoints ? (cores - 1 + readReplicas) : readReplicas;
for ( int i = 0; i < 3; i++ )
{
List<Map<String,Object>> members = getMembers( cluster.getCoreMemberById( i ).database() );
assertEquals( 1, members.stream().filter( x -> x.get( "role" ).equals( "WRITE" ) )
.flatMap( x -> Arrays.stream( (Object[]) x.get( "addresses" ) ) ).count() );
assertEquals( readEndPoints, members.stream().filter( x -> x.get( "role" ).equals( "READ" ) )
.flatMap( x -> Arrays.stream( (Object[]) x.get( "addresses" ) ) ).count() );
assertEquals( cores, members.stream().filter( x -> x.get( "role" ).equals( "ROUTE" ) )
.flatMap( x -> Arrays.stream( (Object[]) x.get( "addresses" ) ) ).count() );
}
}
@Test
public void shouldNotBeAbleToDiscoverFromReadReplicas() throws Exception
{
// given
Cluster cluster = clusterRule.withSharedCoreParams( config ).withNumberOfReadReplicas( 2 ).startCluster();
try
{
// when
getMembers( cluster.getReadReplicaById( 0 ).database() );
fail( "Should not be able to discover members from read replicas" );
}
catch ( ProcedureException ex )
{
// then
assertThat( ex.getMessage(), containsString( "There is no procedure with the name" ) );
}
}
@SuppressWarnings( "unchecked" )
private List<Map<String,Object>> getMembers( GraphDatabaseFacade db ) throws TransactionFailureException, org
.neo4j.kernel.api.exceptions.ProcedureException
{
KernelAPI kernel = db.getDependencyResolver().resolveDependency( KernelAPI.class );
KernelTransaction transaction = kernel.newTransaction( Type.implicit, AnonymousContext.read() );
try ( Statement statement = transaction.acquireStatement() )
{
// when
List<Object[]> currentMembers = asList( statement.procedureCallOperations()
.procedureCallRead( procedureName( "dbms", "cluster", "routing", GetServersProcedure.NAME ),
new Object[0] ) );
return (List<Map<String, Object>>) currentMembers.get( 0 )[1];
}
}
}