| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| package org.apache.rya.indexing.pcj.fluo.app.observers; |
| |
| import static org.apache.rya.indexing.pcj.fluo.app.IncrementalUpdateConstants.CONSTRUCT_PREFIX; |
| |
| import org.apache.fluo.api.client.TransactionBase; |
| import org.apache.fluo.api.data.Bytes; |
| import org.apache.fluo.api.data.Column; |
| import org.apache.fluo.api.observer.AbstractObserver; |
| import org.apache.log4j.Logger; |
| import org.apache.rya.api.domain.RyaStatement; |
| import org.apache.rya.indexing.pcj.fluo.app.BindingSetRow; |
| import org.apache.rya.indexing.pcj.fluo.app.NodeType; |
| import org.apache.rya.indexing.pcj.fluo.app.export.IncrementalRyaSubGraphExporter; |
| import org.apache.rya.indexing.pcj.fluo.app.query.FluoQueryColumns; |
| import org.apache.rya.indexing.pcj.fluo.app.query.FluoQueryMetadataCache; |
| import org.apache.rya.indexing.pcj.fluo.app.query.MetadataCacheSupplier; |
| import org.apache.rya.indexing.pcj.fluo.app.util.BindingHashShardingFunction; |
| |
| /** |
| * Monitors the Column {@link FluoQueryColumns#CONSTRUCT_STATEMENTS} for new |
| * Construct Query {@link RyaStatement}s and exports the results using the |
| * {@link IncrementalRyaSubGraphExporter}s that are registered with this |
| * Observer. |
| * |
| */ |
| public class ConstructQueryResultObserver extends AbstractObserver { |
| |
| private static final Logger log = Logger.getLogger(ConstructQueryResultObserver.class); |
| private final FluoQueryMetadataCache queryDao = MetadataCacheSupplier.getOrCreateCache(); |
| |
| @Override |
| public ObservedColumn getObservedColumn() { |
| return new ObservedColumn(FluoQueryColumns.CONSTRUCT_STATEMENTS, NotificationType.STRONG); |
| } |
| |
| @Override |
| public void process(TransactionBase tx, Bytes row, Column col) throws Exception { |
| |
| //Build row for parent that result will be written to |
| BindingSetRow bsRow = BindingSetRow.makeFromShardedRow(Bytes.of(CONSTRUCT_PREFIX), row); |
| String constructNodeId = bsRow.getNodeId(); |
| String bsString= bsRow.getBindingSetString(); |
| String parentNodeId = queryDao.readMetadadataEntry(tx, constructNodeId, FluoQueryColumns.CONSTRUCT_PARENT_NODE_ID).toString(); |
| Bytes rowBytes = BindingHashShardingFunction.getShardedScanPrefix(parentNodeId, bsString); |
| |
| //Get NodeType of the parent node |
| NodeType parentType = NodeType.fromNodeId(parentNodeId).get(); |
| //Get data for the ConstructQuery result |
| Bytes bytes = tx.get(row, col); |
| //Write result to parent |
| tx.set(rowBytes, parentType.getResultColumn(), bytes); |
| } |
| |
| } |