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Fixture.java
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Fixture.java
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/*
* Copyright (c) 2002-2018 "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.core.consensus.election;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.concurrent.TimeoutException;
import java.util.concurrent.atomic.AtomicBoolean;
import org.neo4j.causalclustering.core.consensus.RaftMachine;
import org.neo4j.causalclustering.core.consensus.RaftMachineBuilder;
import org.neo4j.causalclustering.core.consensus.log.InMemoryRaftLog;
import org.neo4j.causalclustering.core.consensus.log.RaftLogEntry;
import org.neo4j.causalclustering.core.consensus.membership.MemberIdSet;
import org.neo4j.causalclustering.core.consensus.membership.MembershipEntry;
import org.neo4j.causalclustering.core.consensus.schedule.TimerService;
import org.neo4j.causalclustering.core.state.snapshot.RaftCoreState;
import org.neo4j.causalclustering.identity.MemberId;
import org.neo4j.causalclustering.identity.RaftTestMemberSetBuilder;
import org.neo4j.causalclustering.messaging.TestNetwork;
import org.neo4j.function.Predicates;
import org.neo4j.kernel.impl.scheduler.CentralJobScheduler;
import org.neo4j.logging.NullLogProvider;
import org.neo4j.scheduler.JobScheduler;
import static java.util.concurrent.TimeUnit.MILLISECONDS;
import static java.util.concurrent.TimeUnit.SECONDS;
import static org.neo4j.helpers.collection.Iterables.asSet;
public class Fixture
{
private final Set<MemberId> members = new HashSet<>();
private final Set<BootstrapWaiter> bootstrapWaiters = new HashSet<>();
private final List<TimerService> timerServices = new ArrayList<>();
private final JobScheduler scheduler = new CentralJobScheduler();
final Set<RaftFixture> rafts = new HashSet<>();
final TestNetwork net;
Fixture( Set<MemberId> memberIds, TestNetwork net, long electionTimeout, long heartbeatInterval )
{
this.net = net;
for ( MemberId member : memberIds )
{
TestNetwork.Inbound inbound = net.new Inbound( member );
TestNetwork.Outbound outbound = net.new Outbound( member );
members.add( member );
TimerService timerService = createTimerService();
BootstrapWaiter waiter = new BootstrapWaiter();
bootstrapWaiters.add( waiter );
InMemoryRaftLog raftLog = new InMemoryRaftLog();
RaftMachine raftMachine =
new RaftMachineBuilder( member, memberIds.size(), RaftTestMemberSetBuilder.INSTANCE )
.electionTimeout( electionTimeout )
.heartbeatInterval( heartbeatInterval )
.inbound( inbound )
.outbound( outbound )
.timerService( timerService )
.raftLog( raftLog )
.commitListener( waiter )
.build();
rafts.add( new RaftFixture( raftMachine, raftLog ) );
}
}
private TimerService createTimerService()
{
TimerService timerService = new TimerService( scheduler, NullLogProvider.getInstance() );
timerServices.add( timerService );
return timerService;
}
void boot() throws Throwable
{
scheduler.init();
scheduler.start();
for ( RaftFixture raft : rafts )
{
raft.raftLog().append( new RaftLogEntry( 0, new MemberIdSet( asSet( members ) ) ) );
raft.raftMachine().installCoreState( new RaftCoreState( new MembershipEntry( 0, members ) ) );
raft.raftMachine.postRecoveryActions();
}
net.start();
awaitBootstrapped();
}
public void tearDown() throws Throwable
{
net.stop();
for ( RaftFixture raft : rafts )
{
raft.raftMachine().logShippingManager().stop();
}
scheduler.stop();
scheduler.shutdown();
}
/**
* This class simply waits for a single entry to have been committed,
* which should be the initial member set entry.
*
* If all members of the cluster have committed such an entry, it's possible for any member
* to perform elections. We need to meet this condition before we start disconnecting members.
*/
private static class BootstrapWaiter implements RaftMachineBuilder.CommitListener
{
private AtomicBoolean bootstrapped = new AtomicBoolean( false );
@Override
public void notifyCommitted( long commitIndex )
{
if ( commitIndex >= 0 )
{
bootstrapped.set( true );
}
}
}
private void awaitBootstrapped() throws TimeoutException
{
Predicates.await( () ->
{
for ( BootstrapWaiter bootstrapWaiter : bootstrapWaiters )
{
if ( !bootstrapWaiter.bootstrapped.get() )
{
return false;
}
}
return true;
}, 30, SECONDS, 100, MILLISECONDS );
}
class RaftFixture
{
private final RaftMachine raftMachine;
private final InMemoryRaftLog raftLog;
RaftFixture( RaftMachine raftMachine, InMemoryRaftLog raftLog )
{
this.raftMachine = raftMachine;
this.raftLog = raftLog;
}
public RaftMachine raftMachine()
{
return raftMachine;
}
public InMemoryRaftLog raftLog()
{
return raftLog;
}
}
}