| /* |
| * 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 java.util.Objects.requireNonNull; |
| import static org.apache.rya.indexing.pcj.fluo.app.IncrementalUpdateConstants.FILTER_PREFIX; |
| |
| import org.apache.fluo.api.client.TransactionBase; |
| import org.apache.fluo.api.data.Bytes; |
| import org.apache.rya.api.model.VisibilityBindingSet; |
| import org.apache.rya.indexing.pcj.fluo.app.BindingSetRow; |
| import org.apache.rya.indexing.pcj.fluo.app.query.FilterMetadata; |
| import org.apache.rya.indexing.pcj.fluo.app.query.FluoQueryColumns; |
| import org.apache.rya.indexing.pcj.storage.accumulo.VisibilityBindingSetSerDe; |
| import org.eclipse.rdf4j.query.BindingSet; |
| |
| /** |
| * Notified when the results of a Filter have been updated to include a new |
| * {@link BindingSet}. This observer updates its parent if the new Binding Set |
| * effects the parent's results. |
| */ |
| public class FilterObserver extends BindingSetUpdater { |
| |
| private static final VisibilityBindingSetSerDe BS_SERDE = new VisibilityBindingSetSerDe(); |
| |
| @Override |
| public ObservedColumn getObservedColumn() { |
| return new ObservedColumn(FluoQueryColumns.FILTER_BINDING_SET, NotificationType.STRONG); |
| } |
| |
| @Override |
| public Observation parseObservation(final TransactionBase tx, final Bytes row) throws Exception { |
| requireNonNull(tx); |
| requireNonNull(row); |
| |
| // Read the Filter metadata. |
| final String filterNodeId = BindingSetRow.makeFromShardedRow(Bytes.of(FILTER_PREFIX), row).getNodeId(); |
| final FilterMetadata filterMetadata = queryDao.readFilterMetadata(tx, filterNodeId); |
| |
| // Read the Visibility Binding Set from the value. |
| final Bytes valueBytes = tx.get(row, FluoQueryColumns.FILTER_BINDING_SET); |
| final VisibilityBindingSet filterBindingSet = BS_SERDE.deserialize(valueBytes); |
| |
| // Figure out which node needs to handle the new metadata. |
| final String parentNodeId = filterMetadata.getParentNodeId(); |
| |
| return new Observation(filterNodeId, filterBindingSet, parentNodeId); |
| } |
| } |