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ClusterOverviewIT.java
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ClusterOverviewIT.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.coreedge.scenarios;
import java.util.List;
import org.hamcrest.Description;
import org.hamcrest.Matcher;
import org.hamcrest.TypeSafeMatcher;
import org.junit.Rule;
import org.junit.Test;
import org.neo4j.coreedge.discovery.Cluster;
import org.neo4j.coreedge.server.core.ClusterOverviewProcedure;
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.impl.factory.GraphDatabaseFacade;
import org.neo4j.test.coreedge.ClusterRule;
import static org.hamcrest.MatcherAssert.assertThat;
import static org.neo4j.helpers.collection.Iterators.asList;
import static org.neo4j.kernel.api.proc.ProcedureSignature.procedureName;
import static org.neo4j.kernel.api.security.AccessMode.Static.READ;
public class ClusterOverviewIT
{
@Rule
public final ClusterRule clusterRule = new ClusterRule( getClass() ).withNumberOfCoreServers( 3 );
@Test
public void shouldDiscoverCoreClusterMembers() throws Exception
{
// when
Cluster cluster = clusterRule.withNumberOfEdgeServers( 1 ).startCluster();
// then
List<Object[]> overview;
for ( int i = 0; i < 3; i++ )
{
overview = clusterOverview( cluster.getCoreServerById( i ) );
assertThat( overview, containsRole( "leader", 1 ) );
assertThat( overview, containsRole( "follower", 2 ) );
assertThat( overview, containsRole( "read_replica", 1 ) );
// core
assertThat( overview, containsAddress( "127.0.0.1:8000" ) );
assertThat( overview, containsAddress( "127.0.0.1:8001" ) );
assertThat( overview, containsAddress( "127.0.0.1:8002" ) );
// read replicas
assertThat( overview, containsAddress( "127.0.0.1:9000" ) );
}
}
private Matcher<? super List<Object[]>> containsAddress(String address)
{
return new TypeSafeMatcher<List<Object[]>>()
{
@Override
public boolean matchesSafely( List<Object[]> overview )
{
for ( Object[] row : overview )
{
if ( row[1].toString().equals( address ) )
{
return true;
}
}
return false;
}
@Override
public void describeTo( Description description )
{
description.appendText( "Expected to find leader in the cluster but didn't" );
}
};
}
private Matcher<? super List<Object[]>> containsRole(String role, int expectedRoleCount)
{
return new TypeSafeMatcher<List<Object[]>>()
{
@Override
public boolean matchesSafely( List<Object[]> overview )
{
int numberOfMachinesForRole = 0;
for ( Object[] row : overview )
{
if ( row[2].toString().equals( role ) )
{
numberOfMachinesForRole++;
}
}
return numberOfMachinesForRole == expectedRoleCount;
}
@Override
public void describeTo( Description description )
{
description.appendText( "Expected to find " + role + " in the cluster but didn't" );
}
};
}
private List<Object[]> clusterOverview( GraphDatabaseFacade db ) throws TransactionFailureException,
ProcedureException
{
KernelAPI kernel = db.getDependencyResolver().resolveDependency( KernelAPI.class );
KernelTransaction transaction = kernel.newTransaction( Type.implicit, READ );
Statement statement = transaction.acquireStatement();
// when
return asList( statement.readOperations().procedureCallRead(
procedureName( "dbms", "cluster", ClusterOverviewProcedure.NAME ),
new Object[0] ) );
}
}