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BoltRequestMessageReader.java
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BoltRequestMessageReader.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 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 java.util.Map;
import java.util.Optional;
import org.neo4j.bolt.v1.packstream.PackStream;
import org.neo4j.bolt.v1.runtime.Neo4jError;
import org.neo4j.kernel.api.exceptions.Status;
/**
* Reader for Bolt request messages made available via a {@link Neo4jPack.Unpacker}.
*/
public class BoltRequestMessageReader
{
private final Neo4jPack.Unpacker unpacker;
public BoltRequestMessageReader( Neo4jPack.Unpacker unpacker )
{
this.unpacker = unpacker;
}
public boolean hasNext() throws IOException
{
return unpacker.hasNext();
}
/**
* Parse and handle a single message by handing it off
* to a {@link BoltRequestMessageHandler} instance.
*
* @param handler handler for request messages
*/
public <E extends Exception> void read( BoltRequestMessageHandler<E> handler ) throws IOException, E
{
try
{
unpacker.unpackStructHeader();
final int signature = (int) unpacker.unpackStructSignature();
BoltRequestMessage message = BoltRequestMessage.withSignature( signature );
try
{
switch ( message )
{
case INIT:
String clientName = unpacker.unpackString();
Map<String,Object> credentials = unpacker.unpackToRawMap();
handler.onInit( clientName, credentials );
break;
case ACK_FAILURE:
handler.onAckFailure();
break;
case RESET:
handler.onReset();
break;
case RUN:
String statement = unpacker.unpackString();
Map<String,Object> params = unpacker.unpackToRawMap();
Optional<Neo4jError> error = unpacker.consumeError();
if ( error.isPresent() )
{
handler.onExternalError( error.get() );
}
else
{
handler.onRun( statement, params );
}
break;
case DISCARD_ALL:
handler.onDiscardAll();
break;
case PULL_ALL:
handler.onPullAll();
break;
default:
throw new BoltIOException( Status.Request.Invalid,
"Message 0x" + Integer.toHexString( signature ) + " is not supported." );
}
}
catch ( IllegalArgumentException e )
{
throw new BoltIOException( Status.Request.Invalid,
"0x" + Integer.toHexString( signature ) + " is not a valid message signature." );
}
}
catch ( PackStream.PackStreamException e )
{
throw new BoltIOException( Status.Request.InvalidFormat, "Unable to read message type. " +
"Error was: " + e.getMessage(), e );
}
}
}