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TransportBridge.java
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TransportBridge.java
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/*
* Copyright (c) 2002-2016 "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.msgprocess;
import java.io.IOException;
import java.util.Map;
import org.neo4j.logging.Log;
import org.neo4j.bolt.v1.messaging.MessageHandler;
import org.neo4j.bolt.v1.runtime.Session;
import org.neo4j.bolt.v1.runtime.StatementMetadata;
import org.neo4j.bolt.v1.runtime.spi.RecordStream;
/** Bridges the gap between incoming deserialized messages, the user environment and back. */
public class TransportBridge extends MessageHandler.Adapter<RuntimeException>
{
// Note that these callbacks can be used for multiple in-flight requests simultaneously, you cannot reset them
// while there are in-flight requests.
private final MessageProcessingCallback<StatementMetadata> runCallback;
private final MessageProcessingCallback<RecordStream> resultStreamCallback;
private final MessageProcessingCallback<Void> simpleCallback;
private Session session;
public TransportBridge( Log log )
{
this.resultStreamCallback = new RecordStreamCallback( log );
this.simpleCallback = new MessageProcessingCallback<>( log );
this.runCallback = new RunCallback( log );
}
/**
* Reset this bridge to be used for a different session. This method CANNOT be called while there are in-flight
* requests for this bridge running, doing so will cause protocol errors.
*/
public TransportBridge reset( Session session, MessageHandler<IOException> output,
Runnable onEachCompletedRequest )
{
this.session = session;
this.simpleCallback.reset( output, onEachCompletedRequest );
this.resultStreamCallback.reset( output, onEachCompletedRequest );
this.runCallback.reset( output, onEachCompletedRequest );
return this;
}
@Override
public void handleInitMessage( String clientName ) throws RuntimeException
{
session.init( clientName, null, simpleCallback );
}
@Override
public void handleRunMessage( String statement, Map<String,Object> params )
{
session.run( statement, params, null, runCallback );
}
@Override
public void handlePullAllMessage()
{
session.pullAll( null, resultStreamCallback );
}
@Override
public void handleDiscardAllMessage()
{
session.discardAll( null, simpleCallback );
}
@Override
public void handleResetMessage() throws RuntimeException
{
session.reset( null, simpleCallback );
}
}