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Server.java
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Server.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.net;
import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.Channel;
import io.netty.channel.ChannelInboundHandler;
import io.netty.channel.ChannelOption;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import java.net.BindException;
import java.util.concurrent.TimeUnit;
import org.neo4j.causalclustering.helper.Enableable;
import org.neo4j.helpers.ListenSocketAddress;
import org.neo4j.helpers.NamedThreadFactory;
import org.neo4j.kernel.lifecycle.LifecycleAdapter;
import org.neo4j.logging.Log;
import org.neo4j.logging.LogProvider;
import org.neo4j.logging.NullLogProvider;
public class Server extends LifecycleAdapter implements Enableable
{
private final Log debugLog;
private final Log userLog;
private final String serverName;
private final NamedThreadFactory threadFactory;
private final ChildInitializer childInitializer;
private final ChannelInboundHandler parentHandler;
private final ListenSocketAddress listenAddress;
private EventLoopGroup workerGroup;
private Channel channel;
private boolean enabled = true;
private boolean stoppedByLifeCycle = true;
public Server( ChildInitializer childInitializer, LogProvider debugLogProvider, LogProvider userLogProvider, ListenSocketAddress listenAddress,
String serverName )
{
this( childInitializer, null, debugLogProvider, userLogProvider, listenAddress, serverName );
}
public Server( ChildInitializer childInitializer, ChannelInboundHandler parentHandler, LogProvider debugLogProvider, LogProvider userLogProvider,
ListenSocketAddress listenAddress, String serverName )
{
this.childInitializer = childInitializer;
this.parentHandler = parentHandler;
this.listenAddress = listenAddress;
this.debugLog = debugLogProvider.getLog( getClass() );
this.userLog = userLogProvider.getLog( getClass() );
this.serverName = serverName;
this.threadFactory = new NamedThreadFactory( serverName );
}
public Server( ChildInitializer childInitializer, ListenSocketAddress listenAddress, String serverName )
{
this( childInitializer, null, NullLogProvider.getInstance(), NullLogProvider.getInstance(), listenAddress, serverName );
}
@Override
public synchronized void start()
{
stoppedByLifeCycle = false;
if ( !enabled )
{
debugLog.info( "Start call from lifecycle is ignored because server is disabled." );
}
else
{
doStart();
}
}
@Override
public void stop()
{
stoppedByLifeCycle = true;
doStop();
}
@Override
public void shutdown()
{
stoppedByLifeCycle = true;
}
private void doStart()
{
if ( channel != null )
{
return;
}
workerGroup = new NioEventLoopGroup( 0, threadFactory );
ServerBootstrap bootstrap = new ServerBootstrap().group( workerGroup )
.channel( NioServerSocketChannel.class )
.option( ChannelOption.SO_REUSEADDR, Boolean.TRUE )
.localAddress( listenAddress.socketAddress() )
.childHandler( childInitializer.asChannelInitializer() );
if ( parentHandler != null )
{
bootstrap.handler( parentHandler );
}
try
{
channel = bootstrap.bind().syncUninterruptibly().channel();
debugLog.info( serverName + ": bound to " + listenAddress );
}
catch ( Exception e )
{
//noinspection ConstantConditions netty sneaky throw
if ( e instanceof BindException )
{
String message = serverName + ": address is already bound: " + listenAddress;
userLog.error( message );
debugLog.error( message, e );
}
throw e;
}
}
public boolean isRunnig()
{
return channel != null;
}
private void doStop()
{
if ( channel == null )
{
return;
}
debugLog.info( serverName + ": stopping and unbinding from: " + listenAddress );
try
{
channel.close().sync();
channel = null;
}
catch ( InterruptedException e )
{
Thread.currentThread().interrupt();
debugLog.warn( "Interrupted while closing channel." );
}
if ( workerGroup != null && workerGroup.shutdownGracefully( 2, 5, TimeUnit.SECONDS ).awaitUninterruptibly( 10, TimeUnit.SECONDS ) )
{
debugLog.warn( "Worker group not shutdown within 10 seconds." );
}
workerGroup = null;
}
public ListenSocketAddress address()
{
return listenAddress;
}
@Override
public synchronized void enable()
{
enabled = true;
if ( !stoppedByLifeCycle )
{
doStart();
}
else
{
debugLog.info( "Server will not start. It was enabled but is stopped by lifecycle" );
}
}
@Override
public synchronized void disable()
{
enabled = false;
doStop();
}
}