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RaftServerModule.java
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RaftServerModule.java
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/*
* Copyright (c) 2002-2018 "Neo4j,"
* Neo4j Sweden AB [http://neo4j.com]
*
* This file is part of Neo4j Enterprise Edition. The included source
* code can be redistributed and/or modified under the terms of the
* GNU AFFERO GENERAL PUBLIC LICENSE Version 3
* (http://www.fsf.org/licensing/licenses/agpl-3.0.html) with the
* Commons Clause, as found in the associated LICENSE.txt file.
*
* 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.
*
* Neo4j object code can be licensed independently from the source
* under separate terms from the AGPL. Inquiries can be directed to:
* licensing@neo4j.com
*
* More information is also available at:
* https://neo4j.com/licensing/
*/
package org.neo4j.causalclustering.core;
import io.netty.channel.ChannelInboundHandler;
import java.util.Collection;
import java.util.function.Function;
import org.neo4j.causalclustering.catchup.CatchupAddressProvider;
import org.neo4j.causalclustering.catchup.storecopy.LocalDatabase;
import org.neo4j.causalclustering.core.consensus.ConsensusModule;
import org.neo4j.causalclustering.core.consensus.ContinuousJob;
import org.neo4j.causalclustering.core.consensus.LeaderAvailabilityHandler;
import org.neo4j.causalclustering.core.consensus.RaftMessageMonitoringHandler;
import org.neo4j.causalclustering.core.consensus.RaftMessageNettyHandler;
import org.neo4j.causalclustering.core.consensus.RaftMessageTimerResetMonitor;
import org.neo4j.causalclustering.core.consensus.RaftMessages.ReceivedInstantClusterIdAwareMessage;
import org.neo4j.causalclustering.core.consensus.protocol.v1.RaftProtocolServerInstallerV1;
import org.neo4j.causalclustering.core.consensus.protocol.v2.RaftProtocolServerInstallerV2;
import org.neo4j.causalclustering.core.server.CoreServerModule;
import org.neo4j.causalclustering.core.state.RaftMessageApplier;
import org.neo4j.causalclustering.identity.MemberId;
import org.neo4j.causalclustering.logging.MessageLogger;
import org.neo4j.causalclustering.messaging.ComposableMessageHandler;
import org.neo4j.causalclustering.messaging.LifecycleMessageHandler;
import org.neo4j.causalclustering.messaging.LoggingInbound;
import org.neo4j.causalclustering.net.Server;
import org.neo4j.causalclustering.protocol.ModifierProtocolInstaller;
import org.neo4j.causalclustering.protocol.NettyPipelineBuilderFactory;
import org.neo4j.causalclustering.protocol.Protocol;
import org.neo4j.causalclustering.protocol.ProtocolInstaller;
import org.neo4j.causalclustering.protocol.ProtocolInstallerRepository;
import org.neo4j.causalclustering.protocol.handshake.ApplicationProtocolRepository;
import org.neo4j.causalclustering.protocol.handshake.ApplicationSupportedProtocols;
import org.neo4j.causalclustering.protocol.handshake.HandshakeServerInitializer;
import org.neo4j.causalclustering.protocol.handshake.ModifierProtocolRepository;
import org.neo4j.causalclustering.protocol.handshake.ModifierSupportedProtocols;
import org.neo4j.graphdb.factory.module.PlatformModule;
import org.neo4j.helpers.ListenSocketAddress;
import org.neo4j.kernel.configuration.Config;
import org.neo4j.logging.LogProvider;
import org.neo4j.scheduler.Group;
import static java.util.Arrays.asList;
import static org.neo4j.causalclustering.core.CausalClusteringSettings.raft_in_queue_max_batch;
import static org.neo4j.causalclustering.core.CausalClusteringSettings.raft_in_queue_max_batch_bytes;
import static org.neo4j.causalclustering.core.CausalClusteringSettings.raft_in_queue_max_bytes;
import static org.neo4j.causalclustering.core.CausalClusteringSettings.raft_in_queue_size;
class RaftServerModule
{
private final PlatformModule platformModule;
private final ConsensusModule consensusModule;
private final IdentityModule identityModule;
private final ApplicationSupportedProtocols supportedApplicationProtocol;
private final LocalDatabase localDatabase;
private final MessageLogger<MemberId> messageLogger;
private final LogProvider logProvider;
private final NettyPipelineBuilderFactory pipelineBuilderFactory;
private CatchupAddressProvider.PrioritisingUpstreamStrategyBasedAddressProvider catchupAddressProvider;
private final Collection<ModifierSupportedProtocols> supportedModifierProtocols;
private RaftServerModule( PlatformModule platformModule, ConsensusModule consensusModule, IdentityModule identityModule, CoreServerModule coreServerModule,
LocalDatabase localDatabase, NettyPipelineBuilderFactory pipelineBuilderFactory, MessageLogger<MemberId> messageLogger,
CatchupAddressProvider.PrioritisingUpstreamStrategyBasedAddressProvider catchupAddressProvider,
ApplicationSupportedProtocols supportedApplicationProtocol,
Collection<ModifierSupportedProtocols> supportedModifierProtocols, ChannelInboundHandler installedProtocolsHandler )
{
this.platformModule = platformModule;
this.consensusModule = consensusModule;
this.identityModule = identityModule;
this.supportedApplicationProtocol = supportedApplicationProtocol;
this.localDatabase = localDatabase;
this.messageLogger = messageLogger;
this.logProvider = platformModule.logging.getInternalLogProvider();
this.pipelineBuilderFactory = pipelineBuilderFactory;
this.catchupAddressProvider = catchupAddressProvider;
this.supportedModifierProtocols = supportedModifierProtocols;
LifecycleMessageHandler<ReceivedInstantClusterIdAwareMessage<?>> messageHandlerChain = createMessageHandlerChain( coreServerModule );
createRaftServer( coreServerModule, messageHandlerChain, installedProtocolsHandler );
}
static void createAndStart( PlatformModule platformModule, ConsensusModule consensusModule, IdentityModule identityModule,
CoreServerModule coreServerModule, LocalDatabase localDatabase, NettyPipelineBuilderFactory pipelineBuilderFactory,
MessageLogger<MemberId> messageLogger, CatchupAddressProvider.PrioritisingUpstreamStrategyBasedAddressProvider addressProvider,
ApplicationSupportedProtocols supportedApplicationProtocol,
Collection<ModifierSupportedProtocols> supportedModifierProtocols, ChannelInboundHandler installedProtocolsHandler )
{
new RaftServerModule( platformModule, consensusModule, identityModule, coreServerModule, localDatabase, pipelineBuilderFactory, messageLogger,
addressProvider, supportedApplicationProtocol, supportedModifierProtocols, installedProtocolsHandler );
}
private void createRaftServer( CoreServerModule coreServerModule, LifecycleMessageHandler<ReceivedInstantClusterIdAwareMessage<?>> messageHandlerChain,
ChannelInboundHandler installedProtocolsHandler )
{
ApplicationProtocolRepository applicationProtocolRepository =
new ApplicationProtocolRepository( Protocol.ApplicationProtocols.values(), supportedApplicationProtocol );
ModifierProtocolRepository modifierProtocolRepository =
new ModifierProtocolRepository( Protocol.ModifierProtocols.values(), supportedModifierProtocols );
RaftMessageNettyHandler nettyHandler = new RaftMessageNettyHandler( logProvider );
RaftProtocolServerInstallerV2.Factory raftProtocolServerInstallerV2 =
new RaftProtocolServerInstallerV2.Factory( nettyHandler, pipelineBuilderFactory, logProvider );
RaftProtocolServerInstallerV1.Factory raftProtocolServerInstallerV1 =
new RaftProtocolServerInstallerV1.Factory( nettyHandler, pipelineBuilderFactory,
logProvider );
ProtocolInstallerRepository<ProtocolInstaller.Orientation.Server> protocolInstallerRepository =
new ProtocolInstallerRepository<>( asList( raftProtocolServerInstallerV1, raftProtocolServerInstallerV2 ),
ModifierProtocolInstaller.allServerInstallers );
HandshakeServerInitializer handshakeServerInitializer = new HandshakeServerInitializer( applicationProtocolRepository, modifierProtocolRepository,
protocolInstallerRepository, pipelineBuilderFactory, logProvider );
ListenSocketAddress raftListenAddress = platformModule.config.get( CausalClusteringSettings.raft_listen_address );
Server raftServer = new Server( handshakeServerInitializer, installedProtocolsHandler, logProvider, platformModule.logging.getUserLogProvider(),
raftListenAddress, "raft-server" );
LoggingInbound<ReceivedInstantClusterIdAwareMessage<?>> loggingRaftInbound =
new LoggingInbound<>( nettyHandler, messageLogger, identityModule.myself() );
loggingRaftInbound.registerHandler( messageHandlerChain );
platformModule.life.add( raftServer ); // must start before core state so that it can trigger snapshot downloads when necessary
platformModule.life.add( coreServerModule.createCoreLife( messageHandlerChain ) );
platformModule.life.add( coreServerModule.catchupServer() ); // must start last and stop first, since it handles external requests
coreServerModule.backupServer().ifPresent( platformModule.life::add );
platformModule.life.add( coreServerModule.downloadService() );
}
private LifecycleMessageHandler<ReceivedInstantClusterIdAwareMessage<?>> createMessageHandlerChain( CoreServerModule coreServerModule )
{
RaftMessageApplier messageApplier = new RaftMessageApplier( localDatabase, logProvider,
consensusModule.raftMachine(), coreServerModule.downloadService(),
coreServerModule.commandApplicationProcess(), catchupAddressProvider );
ComposableMessageHandler monitoringHandler = RaftMessageMonitoringHandler.composable( platformModule.clock, platformModule.monitors );
ComposableMessageHandler batchingMessageHandler = createBatchingHandler( platformModule.config );
ComposableMessageHandler leaderAvailabilityHandler = LeaderAvailabilityHandler.composable( consensusModule.getLeaderAvailabilityTimers(),
platformModule.monitors.newMonitor( RaftMessageTimerResetMonitor.class ), consensusModule.raftMachine()::term );
ComposableMessageHandler clusterBindingHandler = ClusterBindingHandler.composable( logProvider );
return clusterBindingHandler
.compose( leaderAvailabilityHandler )
.compose( batchingMessageHandler )
.compose( monitoringHandler )
.apply( messageApplier );
}
private ComposableMessageHandler createBatchingHandler( Config config )
{
Function<Runnable,ContinuousJob> jobFactory = runnable -> new ContinuousJob(
platformModule.jobScheduler.threadFactory( Group.RAFT_BATCH_HANDLER ), runnable,
logProvider );
BoundedPriorityQueue.Config inQueueConfig = new BoundedPriorityQueue.Config( config.get( raft_in_queue_size ),
config.get( raft_in_queue_max_bytes ) );
BatchingMessageHandler.Config batchConfig = new BatchingMessageHandler.Config(
config.get( raft_in_queue_max_batch ), config.get( raft_in_queue_max_batch_bytes ) );
return BatchingMessageHandler.composable( inQueueConfig, batchConfig, jobFactory, logProvider );
}
}