001/*
002 * Copyright (c) 2007-2022 The Cascading Authors. All Rights Reserved.
003 *
004 * Project and contact information: https://cascading.wensel.net/
005 *
006 * This file is part of the Cascading project.
007 *
008 * Licensed under the Apache License, Version 2.0 (the "License");
009 * you may not use this file except in compliance with the License.
010 * You may obtain a copy of the License at
011 *
012 *     http://www.apache.org/licenses/LICENSE-2.0
013 *
014 * Unless required by applicable law or agreed to in writing, software
015 * distributed under the License is distributed on an "AS IS" BASIS,
016 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
017 * See the License for the specific language governing permissions and
018 * limitations under the License.
019 */
020
021package cascading.local.tap.neo4j;
022
023import java.io.IOException;
024import java.util.Properties;
025
026import cascading.flow.FlowProcess;
027import cascading.scheme.SinkCall;
028import cascading.scheme.SourceCall;
029import cascading.tap.Tap;
030import cascading.tuple.Fields;
031import cascading.tuple.TupleEntry;
032import com.fasterxml.jackson.databind.JsonNode;
033import org.neo4j.driver.v1.Session;
034import org.neo4j.driver.v1.StatementResult;
035import org.slf4j.Logger;
036import org.slf4j.LoggerFactory;
037
038/**
039 *
040 */
041public class Neo4jJSONScheme extends Neo4jScheme
042  {
043  private static final Logger LOG = LoggerFactory.getLogger( Neo4jJSONScheme.class );
044
045  private final JSONGraphSpec graphSpec;
046
047  public Neo4jJSONScheme( Fields sinkFields, JSONGraphSpec graphSpec )
048    {
049    super( Fields.UNKNOWN, sinkFields );
050    this.graphSpec = graphSpec;
051
052    if( !sinkFields.isDeclarator() || sinkFields.size() > 1 )
053      throw new IllegalArgumentException( "sink fields must be size one, got: " + sinkFields.print() );
054    }
055
056  @Override
057  public boolean isSource()
058    {
059    return false;
060    }
061
062  @Override
063  public void sourceConfInit( FlowProcess<? extends Properties> flowProcess, Tap<Properties, Void, Session> tap, Properties conf )
064    {
065    throw new UnsupportedOperationException();
066    }
067
068  @Override
069  public boolean source( FlowProcess<? extends Properties> flowProcess, SourceCall<Context, Void> sourceCall ) throws IOException
070    {
071    throw new UnsupportedOperationException();
072    }
073
074  @Override
075  public void sinkConfInit( FlowProcess<? extends Properties> flowProcess, Tap<Properties, Void, Session> tap, Properties conf )
076    {
077
078    }
079
080  @Override
081  public void sinkPrepare( FlowProcess<? extends Properties> flowProcess, SinkCall<Context, Session> sinkCall ) throws IOException
082    {
083    sinkCall.setContext( new Context<>( new Neo4jJSONStatement( graphSpec ) ) );
084    }
085
086  @Override
087  public void sink( FlowProcess<? extends Properties> flowProcess, SinkCall<Context, Session> sinkCall ) throws IOException
088    {
089    Session session = sinkCall.getOutput();
090    Neo4jStatement<JsonNode> statement = sinkCall.getContext().statement;
091    TupleEntry entry = sinkCall.getOutgoingEntry();
092
093    JsonNode node = (JsonNode) entry.getObject( 0 );
094
095    session.writeTransaction( tx ->
096    {
097    StatementResult result = statement.runStatement( tx, node );
098
099    if( LOG.isDebugEnabled() )
100      LOG.debug( "cypher results: {}", result.summary() );
101
102    return true;
103    } );
104    }
105  }