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SenderService.java
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SenderService.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.messaging;
import java.util.Iterator;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;
import java.util.concurrent.locks.ReadWriteLock;
import java.util.concurrent.locks.ReentrantReadWriteLock;
import java.util.stream.Stream;
import io.netty.bootstrap.Bootstrap;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import org.neo4j.causalclustering.net.BootstrapConfiguration;
import org.neo4j.causalclustering.protocol.handshake.ProtocolStack;
import org.neo4j.helpers.AdvertisedSocketAddress;
import org.neo4j.helpers.NamedThreadFactory;
import org.neo4j.helpers.collection.Pair;
import org.neo4j.scheduler.JobHandle;
import org.neo4j.kernel.lifecycle.LifecycleAdapter;
import org.neo4j.logging.Log;
import org.neo4j.logging.LogProvider;
import static java.util.concurrent.TimeUnit.MICROSECONDS;
import static org.neo4j.causalclustering.net.BootstrapConfiguration.preferNativeClientConfig;
import static org.neo4j.causalclustering.net.NioBootstrapConfig.nioClientConfig;
public class SenderService extends LifecycleAdapter implements Outbound<AdvertisedSocketAddress,Message>
{
private final BootstrapConfiguration<? extends SocketChannel> bootstrapConfiguration;
private ReconnectingChannels channels;
private final ChannelInitializer channelInitializer;
private final ReadWriteLock serviceLock = new ReentrantReadWriteLock();
private final Log log;
private JobHandle jobHandle;
private boolean senderServiceRunning;
private Bootstrap bootstrap;
private EventLoopGroup eventLoopGroup;
public SenderService( ChannelInitializer channelInitializer, LogProvider logProvider, boolean useNativeTransport )
{
this.channelInitializer = channelInitializer;
this.log = logProvider.getLog( getClass() );
this.channels = new ReconnectingChannels();
this.bootstrapConfiguration = useNativeTransport ? preferNativeClientConfig() : nioClientConfig();
}
@Override
public void send( AdvertisedSocketAddress to, Message message, boolean block )
{
Future<Void> future;
serviceLock.readLock().lock();
try
{
if ( !senderServiceRunning )
{
return;
}
future = channel( to ).writeAndFlush( message );
}
finally
{
serviceLock.readLock().unlock();
}
if ( block )
{
try
{
future.get();
}
catch ( ExecutionException e )
{
log.error( "Exception while sending to: " + to, e );
}
catch ( InterruptedException e )
{
log.info( "Interrupted while sending", e );
}
}
}
private Channel channel( AdvertisedSocketAddress destination )
{
ReconnectingChannel channel = channels.get( destination );
if ( channel == null )
{
channel = new ReconnectingChannel( bootstrap, eventLoopGroup.next(), destination, log );
channel.start();
ReconnectingChannel existingNonBlockingChannel = channels.putIfAbsent( destination, channel );
if ( existingNonBlockingChannel != null )
{
channel.dispose();
channel = existingNonBlockingChannel;
}
else
{
log.info( "Creating channel to: [%s] ", destination );
}
}
return channel;
}
@Override
public synchronized void start()
{
serviceLock.writeLock().lock();
try
{
eventLoopGroup = bootstrapConfiguration.eventLoopGroup( new NamedThreadFactory( "sender-service" ) );
bootstrap = new Bootstrap()
.group( eventLoopGroup )
.channel( bootstrapConfiguration.channelClass() )
.handler( channelInitializer );
senderServiceRunning = true;
}
finally
{
serviceLock.writeLock().unlock();
}
}
@Override
public synchronized void stop()
{
serviceLock.writeLock().lock();
try
{
senderServiceRunning = false;
if ( jobHandle != null )
{
jobHandle.cancel( true );
jobHandle = null;
}
Iterator<ReconnectingChannel> itr = channels.values().iterator();
while ( itr.hasNext() )
{
Channel timestampedChannel = itr.next();
timestampedChannel.dispose();
itr.remove();
}
try
{
eventLoopGroup.shutdownGracefully( 0, 0, MICROSECONDS ).sync();
}
catch ( InterruptedException e )
{
log.warn( "Interrupted while stopping sender service." );
}
}
finally
{
serviceLock.writeLock().unlock();
}
}
public Stream<Pair<AdvertisedSocketAddress,ProtocolStack>> installedProtocols()
{
return channels.installedProtocols();
}
}