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SenderService.java
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SenderService.java
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/*
* Copyright (c) 2002-2017 "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.messaging;
import java.util.Iterator;
import java.util.concurrent.locks.ReadWriteLock;
import java.util.concurrent.locks.ReentrantReadWriteLock;
import io.netty.bootstrap.Bootstrap;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioSocketChannel;
import org.neo4j.helpers.AdvertisedSocketAddress;
import org.neo4j.causalclustering.messaging.monitoring.MessageQueueMonitor;
import org.neo4j.helpers.NamedThreadFactory;
import org.neo4j.kernel.impl.util.JobScheduler;
import org.neo4j.kernel.lifecycle.LifecycleAdapter;
import org.neo4j.kernel.monitoring.Monitors;
import org.neo4j.logging.Log;
import org.neo4j.logging.LogProvider;
import static java.util.concurrent.TimeUnit.MICROSECONDS;
public class SenderService extends LifecycleAdapter implements Outbound<AdvertisedSocketAddress,Message>
{
private NonBlockingChannels nonBlockingChannels;
private final ChannelInitializer<SocketChannel> channelInitializer;
private final ReadWriteLock serviceLock = new ReentrantReadWriteLock();
private final Log log;
private final Monitors monitors;
private JobScheduler.JobHandle jobHandle;
private boolean senderServiceRunning;
private Bootstrap bootstrap;
private NioEventLoopGroup eventLoopGroup;
private int maxQueueSize;
public SenderService( ChannelInitializer<SocketChannel> channelInitializer,
LogProvider logProvider,
Monitors monitors,
int maxQueueSize )
{
this.channelInitializer = channelInitializer;
this.log = logProvider.getLog( getClass() );
this.monitors = monitors;
this.maxQueueSize = maxQueueSize;
this.nonBlockingChannels = new NonBlockingChannels();
}
@Override
public void send( AdvertisedSocketAddress to, Message message )
{
serviceLock.readLock().lock();
try
{
if ( !senderServiceRunning )
{
return;
}
channel( to ).send( message );
}
finally
{
serviceLock.readLock().unlock();
}
}
private NonBlockingChannel channel( AdvertisedSocketAddress to )
{
MessageQueueMonitor monitor = monitors.newMonitor( MessageQueueMonitor.class, NonBlockingChannel.class );
NonBlockingChannel nonBlockingChannel = nonBlockingChannels.get( to );
if ( nonBlockingChannel == null )
{
nonBlockingChannel = new NonBlockingChannel( bootstrap, to, log, monitor, maxQueueSize ) ;
NonBlockingChannel existingNonBlockingChannel = nonBlockingChannels.putIfAbsent( to, nonBlockingChannel );
if ( existingNonBlockingChannel != null )
{
nonBlockingChannel.dispose();
nonBlockingChannel = existingNonBlockingChannel;
}
else
{
log.info( "Creating channel to: [%s] ", to );
}
}
monitor.register( to );
return nonBlockingChannel;
}
@Override
public synchronized void start()
{
serviceLock.writeLock().lock();
try
{
eventLoopGroup = new NioEventLoopGroup( 0, new NamedThreadFactory( "sender-service" ) );
bootstrap = new Bootstrap()
.group( eventLoopGroup )
.channel( NioSocketChannel.class )
.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<NonBlockingChannel> itr = nonBlockingChannels.values().iterator();
while ( itr.hasNext() )
{
NonBlockingChannel 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();
}
}
}