| /* |
| * 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.QUERY_PREFIX; |
| import static org.apache.rya.indexing.pcj.fluo.app.query.FluoQueryColumns.QUERY_BINDING_SET; |
| |
| 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.rya.indexing.pcj.fluo.app.BindingSetRow; |
| import org.apache.rya.indexing.pcj.fluo.app.export.ExporterManager; |
| import org.apache.rya.indexing.pcj.fluo.app.export.IncrementalBindingSetExporter; |
| import org.apache.rya.indexing.pcj.fluo.app.export.IncrementalResultExporter; |
| import org.apache.rya.indexing.pcj.fluo.app.export.IncrementalResultExporterFactory; |
| import org.apache.rya.indexing.pcj.fluo.app.export.IncrementalResultExporterFactory.IncrementalExporterFactoryException; |
| import org.apache.rya.indexing.pcj.fluo.app.export.kafka.KafkaBindingSetExporterFactory; |
| import org.apache.rya.indexing.pcj.fluo.app.export.kafka.KafkaRyaSubGraphExporterFactory; |
| import org.apache.rya.indexing.pcj.fluo.app.export.rya.PeriodicBindingSetExporterFactory; |
| import org.apache.rya.indexing.pcj.fluo.app.export.rya.RyaBindingSetExporterFactory; |
| import org.apache.rya.indexing.pcj.fluo.app.export.rya.RyaSubGraphExporterFactory; |
| 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.query.QueryMetadata; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import com.google.common.base.Optional; |
| import com.google.common.collect.ImmutableSet; |
| |
| /** |
| * Performs incremental result exporting to the configured destinations. |
| */ |
| public class QueryResultObserver extends AbstractObserver { |
| |
| private static final Logger log = LoggerFactory.getLogger(QueryResultObserver.class); |
| private final FluoQueryMetadataCache queryDao = MetadataCacheSupplier.getOrCreateCache(); |
| /** |
| * Builders for each type of {@link IncrementalBindingSetExporter} we support. |
| */ |
| private static final ImmutableSet<IncrementalResultExporterFactory> FACTORIES = |
| ImmutableSet.<IncrementalResultExporterFactory>builder() |
| .add(new RyaBindingSetExporterFactory()) |
| .add(new KafkaBindingSetExporterFactory()) |
| .add(new KafkaRyaSubGraphExporterFactory()) |
| .add(new RyaSubGraphExporterFactory()) |
| .add(new PeriodicBindingSetExporterFactory()) |
| .build(); |
| |
| private ExporterManager exporterManager; |
| |
| @Override |
| public ObservedColumn getObservedColumn() { |
| return new ObservedColumn(QUERY_BINDING_SET, NotificationType.STRONG); |
| } |
| |
| /** |
| * Before running, determine which exporters are configured and set them up. |
| */ |
| @Override |
| public void init(final Context context) { |
| |
| final ExporterManager.Builder managerBuilder = ExporterManager.builder(); |
| |
| for(final IncrementalResultExporterFactory builder : FACTORIES) { |
| try { |
| log.debug("Attempting to build exporter from factory: {}", builder); |
| final Optional<IncrementalResultExporter> exporter = builder.build(context); |
| if(exporter.isPresent()) { |
| log.info("Adding exporter: {}", exporter.get()); |
| managerBuilder.addIncrementalResultExporter(exporter.get()); |
| } |
| } catch (final IncrementalExporterFactoryException e) { |
| log.error("Could not initialize a result exporter.", e); |
| } |
| } |
| |
| exporterManager = managerBuilder.build(); |
| } |
| |
| |
| @Override |
| public void process(final TransactionBase tx, final Bytes brow, final Column col) throws Exception { |
| |
| // Read the queryId from the row and get the QueryMetadata. |
| final String queryId = BindingSetRow.makeFromShardedRow(Bytes.of(QUERY_PREFIX), brow).getNodeId(); |
| final QueryMetadata metadata = queryDao.readQueryMetadata(tx, queryId); |
| |
| // Read the Child Binding Set that will be exported. |
| final Bytes valueBytes = tx.get(brow, col); |
| |
| exporterManager.export(metadata.getQueryType(), metadata.getExportStrategies(), queryId, valueBytes); |
| } |
| |
| @Override |
| public void close() { |
| try { |
| exporterManager.close(); |
| } catch (final Exception e) { |
| log.warn("Encountered problems closing the ExporterManager."); |
| } |
| } |
| } |