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AbstractStreamingState.java
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AbstractStreamingState.java
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/*
* Copyright (c) 2002-2018 "Neo4j,"
* Neo4j Sweden AB [http://neo4j.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.v3.runtime;
import org.neo4j.bolt.messaging.RequestMessage;
import org.neo4j.bolt.runtime.BoltConnectionFatality;
import org.neo4j.bolt.runtime.BoltStateMachineState;
import org.neo4j.bolt.runtime.StateMachineContext;
import org.neo4j.bolt.v1.messaging.request.DiscardAllMessage;
import org.neo4j.bolt.v1.messaging.request.InterruptSignal;
import org.neo4j.bolt.v1.messaging.request.PullAllMessage;
import static org.neo4j.util.Preconditions.checkState;
/**
* When STREAMING, a result is available as a stream of records.
* These must be PULLed or DISCARDed before any further statements
* can be executed.
*/
public abstract class AbstractStreamingState extends FailSafeBoltStateMachineState
{
protected BoltStateMachineState readyState;
private BoltStateMachineState interruptedState;
@Override
public BoltStateMachineState process( RequestMessage message, StateMachineContext context ) throws BoltConnectionFatality
{
assertInitialized();
if ( message instanceof PullAllMessage )
{
return processPullAllMessage( context );
}
if ( message instanceof DiscardAllMessage )
{
return processDiscardAllMessage( context );
}
if ( message instanceof InterruptSignal )
{
return interruptedState;
}
return null;
}
public void setReadyState( BoltStateMachineState readyState )
{
this.readyState = readyState;
}
public void setInterruptedState( BoltStateMachineState interruptedState )
{
this.interruptedState = interruptedState;
}
private BoltStateMachineState processPullAllMessage( StateMachineContext context ) throws BoltConnectionFatality
{
return processMessage( context, () -> processStreamResultMessage( true, context ) );
}
private BoltStateMachineState processDiscardAllMessage( StateMachineContext context ) throws BoltConnectionFatality
{
return processMessage( context, () -> processStreamResultMessage( false, context ) );
}
abstract BoltStateMachineState processStreamResultMessage( boolean pull, StateMachineContext context ) throws Throwable;
private void assertInitialized()
{
checkState( readyState != null, "Ready state not set" );
checkState( interruptedState != null, "Interrupted state not set" );
checkState( failedState != null, "Failed state not set" );
}
}