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HandshakeGate.java
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HandshakeGate.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.messaging;
import io.netty.channel.Channel;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.util.concurrent.Future;
import java.util.Optional;
import java.util.concurrent.CompletableFuture;
import java.util.function.BiFunction;
import org.neo4j.causalclustering.protocol.handshake.ClientHandshakeException;
import org.neo4j.causalclustering.protocol.handshake.ClientHandshakeFinishedEvent;
import org.neo4j.causalclustering.protocol.handshake.HandshakeClientInitializer;
import org.neo4j.causalclustering.protocol.handshake.ProtocolStack;
import org.neo4j.logging.Log;
/**
* Gates messages written before the handshake has completed. The handshake is finalized
* by firing a ClientHandshakeFinishedEvent (as a netty user event) in {@link HandshakeClientInitializer}.
*/
public class HandshakeGate implements ChannelInterceptor
{
public static final String HANDSHAKE_GATE = "HandshakeGate";
private final CompletableFuture<ProtocolStack> handshakePromise = new CompletableFuture<>();
HandshakeGate( Channel channel, Log log )
{
log.info( "Handshake gate added" );
channel.pipeline().addFirst( HANDSHAKE_GATE, new ChannelInboundHandlerAdapter()
{
@Override
public void userEventTriggered( ChannelHandlerContext ctx, Object evt ) throws Exception
{
if ( evt instanceof ClientHandshakeFinishedEvent.Success )
{
log.info( "Handshake gate success" );
handshakePromise.complete( ((ClientHandshakeFinishedEvent.Success) evt).protocolStack() );
}
else if ( evt instanceof ClientHandshakeFinishedEvent.Failure )
{
log.warn( "Handshake gate failed" );
handshakePromise.completeExceptionally( new ClientHandshakeException( "Handshake failed" ) );
channel.close();
}
else
{
super.userEventTriggered( ctx, evt );
}
}
} );
}
@Override
public void write( BiFunction<Channel,Object,Future<Void>> writer, Channel channel, Object msg, CompletableFuture<Void> promise )
{
handshakePromise.whenComplete( ( ignored, failure ) ->
writer.apply( channel, msg ).addListener( x -> promise.complete( null ) ) );
}
@Override
public Optional<ProtocolStack> installedProtocolStack()
{
return Optional.ofNullable( handshakePromise.getNow( null ) );
}
}