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CatchUpClient.java
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CatchUpClient.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.catchup;
import io.netty.bootstrap.Bootstrap;
import io.netty.channel.Channel;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelFutureListener;
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 java.net.ConnectException;
import java.time.Clock;
import java.util.Optional;
import java.util.concurrent.CompletableFuture;
import java.util.function.BiConsumer;
import java.util.function.Function;
import org.neo4j.causalclustering.messaging.CatchUpRequest;
import org.neo4j.helpers.AdvertisedSocketAddress;
import org.neo4j.helpers.NamedThreadFactory;
import org.neo4j.kernel.lifecycle.LifecycleAdapter;
import org.neo4j.logging.Log;
import org.neo4j.logging.LogProvider;
import static java.lang.String.format;
import static java.util.concurrent.TimeUnit.MICROSECONDS;
import static org.neo4j.causalclustering.catchup.TimeoutLoop.waitForCompletion;
public class CatchUpClient extends LifecycleAdapter
{
private final Log log;
private final Clock clock;
private final long inactivityTimeoutMillis;
private final Function<CatchUpResponseHandler,ChannelInitializer<SocketChannel>> channelInitializer;
private final CatchUpChannelPool<CatchUpChannel> pool = new CatchUpChannelPool<>( CatchUpChannel::new );
private NioEventLoopGroup eventLoopGroup;
public CatchUpClient( LogProvider logProvider, Clock clock, long inactivityTimeoutMillis,
Function<CatchUpResponseHandler,ChannelInitializer<SocketChannel>> channelInitializer )
{
this.log = logProvider.getLog( getClass() );
this.clock = clock;
this.inactivityTimeoutMillis = inactivityTimeoutMillis;
this.channelInitializer = channelInitializer;
}
public <T> T makeBlockingRequest( AdvertisedSocketAddress upstream, CatchUpRequest request, CatchUpResponseCallback<T> responseHandler )
throws CatchUpClientException
{
CompletableFuture<T> future = new CompletableFuture<>();
CatchUpChannel channel = null;
try
{
channel = pool.acquire( upstream );
channel.setResponseHandler( responseHandler, future );
future.whenComplete( new ReleaseOnComplete( channel ) );
channel.send( request );
}
catch ( Exception e )
{
if ( channel != null )
{
pool.dispose( channel );
}
throw new CatchUpClientException( "Failed to send request", e );
}
String operation = format( "Completed exceptionally when executing operation %s on %s ", request, upstream );
return waitForCompletion( future, operation, channel::millisSinceLastResponse, inactivityTimeoutMillis, log );
}
private class ReleaseOnComplete implements BiConsumer<Object,Throwable>
{
private CatchUpChannel catchUpChannel;
ReleaseOnComplete( CatchUpChannel catchUpChannel )
{
this.catchUpChannel = catchUpChannel;
}
@Override
public void accept( Object o, Throwable throwable )
{
if ( throwable == null )
{
pool.release( catchUpChannel );
}
else
{
pool.dispose( catchUpChannel );
}
}
}
private class CatchUpChannel implements CatchUpChannelPool.Channel
{
private final TrackingResponseHandler handler;
private final AdvertisedSocketAddress destination;
private Channel nettyChannel;
private final Bootstrap bootstrap;
CatchUpChannel( AdvertisedSocketAddress destination )
{
this.destination = destination;
handler = new TrackingResponseHandler( new CatchUpResponseAdaptor(), clock );
bootstrap = new Bootstrap()
.group( eventLoopGroup )
.channel( NioSocketChannel.class )
.handler( channelInitializer.apply( handler ) );
}
void setResponseHandler( CatchUpResponseCallback responseHandler, CompletableFuture<?> requestOutcomeSignal )
{
handler.setResponseHandler( responseHandler, requestOutcomeSignal );
}
void send( CatchUpRequest request ) throws ConnectException
{
if ( !isActive() )
{
throw new ConnectException( "Channel is not connected" );
}
nettyChannel.write( request.messageType() );
nettyChannel.writeAndFlush( request );
}
Optional<Long> millisSinceLastResponse()
{
return handler.lastResponseTime().map( lastResponseMillis -> clock.millis() - lastResponseMillis );
}
@Override
public AdvertisedSocketAddress destination()
{
return destination;
}
@Override
public void connect() throws Exception
{
ChannelFuture channelFuture = bootstrap.connect( destination.socketAddress() );
nettyChannel = channelFuture.sync().channel();
nettyChannel.closeFuture().addListener( (ChannelFutureListener) future -> handler.onClose() );
}
@Override
public boolean isActive()
{
return nettyChannel.isActive();
}
@Override
public void close()
{
if ( nettyChannel != null )
{
nettyChannel.close();
}
}
}
@Override
public void start()
{
eventLoopGroup = new NioEventLoopGroup( 0, new NamedThreadFactory( "catch-up-client" ) );
}
@Override
public void stop()
{
log.info( "CatchUpClient stopping" );
try
{
pool.close();
eventLoopGroup.shutdownGracefully( 0, 0, MICROSECONDS ).sync();
}
catch ( InterruptedException e )
{
log.warn( "Interrupted while stopping catch up client." );
}
}
}