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BoltResponseMessageWriter.java
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BoltResponseMessageWriter.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 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.neo4j.bolt.v1.messaging;
import java.io.IOException;
import org.neo4j.bolt.logging.BoltMessageLogger;
import org.neo4j.bolt.v1.packstream.PackOutput;
import org.neo4j.cypher.result.QueryResult;
import org.neo4j.function.ThrowingAction;
import org.neo4j.kernel.api.exceptions.Status;
import org.neo4j.kernel.impl.logging.LogService;
import org.neo4j.logging.Log;
import org.neo4j.values.AnyValue;
import org.neo4j.values.virtual.MapValue;
import static org.neo4j.bolt.v1.messaging.BoltResponseMessage.FAILURE;
import static org.neo4j.bolt.v1.messaging.BoltResponseMessage.IGNORED;
import static org.neo4j.bolt.v1.messaging.BoltResponseMessage.RECORD;
import static org.neo4j.bolt.v1.messaging.BoltResponseMessage.SUCCESS;
/**
* Writer for Bolt request messages to be sent to a {@link Neo4jPack.Packer}.
*/
public class BoltResponseMessageWriter implements BoltResponseMessageHandler<IOException>
{
private final PackOutput output;
private final Neo4jPack.Packer packer;
private final BoltMessageLogger messageLogger;
private final Log log;
public BoltResponseMessageWriter( Neo4jPack neo4jPack, PackOutput output, LogService logService, BoltMessageLogger messageLogger )
{
this.output = output;
this.packer = neo4jPack.newPacker( output );
this.messageLogger = messageLogger;
this.log = logService.getInternalLog( getClass() );
}
@Override
public void onRecord( QueryResult.Record item ) throws IOException
{
packCompleteMessageOrFail( RECORD, () ->
{
AnyValue[] fields = item.fields();
packer.packStructHeader( 1, RECORD.signature() );
packer.packListHeader( fields.length );
for ( AnyValue field : fields )
{
packer.pack( field );
}
} );
}
@Override
public void onSuccess( MapValue metadata ) throws IOException
{
packCompleteMessageOrFail( SUCCESS, () ->
{
packer.packStructHeader( 1, SUCCESS.signature() );
packer.pack( metadata );
} );
messageLogger.logSuccess( () -> metadata );
}
@Override
public void onIgnored() throws IOException
{
packCompleteMessageOrFail( IGNORED, () ->
{
packer.packStructHeader( 0, IGNORED.signature() );
} );
messageLogger.logIgnored();
}
@Override
public void onFailure( Status status, String errorMessage ) throws IOException
{
packCompleteMessageOrFail( FAILURE, () ->
{
packer.packStructHeader( 1, FAILURE.signature() );
packer.packMapHeader( 2 );
packer.pack( "code" );
packer.pack( status.code().serialize() );
packer.pack( "message" );
packer.pack( errorMessage );
} );
messageLogger.logFailure( status );
}
@Override
public void onFatal( Status status, String errorMessage ) throws IOException
{
messageLogger.serverError( "FATAL", status);
onFailure( status, errorMessage );
flush();
}
public void flush() throws IOException
{
packer.flush();
}
private void packCompleteMessageOrFail( BoltResponseMessage message, ThrowingAction<IOException> action ) throws IOException
{
boolean packingFailed = true;
output.beginMessage();
try
{
action.apply();
packingFailed = false;
output.messageSucceeded();
}
catch ( Throwable error )
{
if ( packingFailed )
{
// packing failed, there might be some half-written data in the output buffer right now
// notify output about the failure so that it cleans up the buffer
output.messageFailed();
log.error( "Failed to write full %s message because: %s", message, error.getMessage() );
}
throw error;
}
}
}