| /* |
| * 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 org.apache.fluo.api.client.TransactionBase; |
| import org.apache.fluo.api.data.Bytes; |
| import org.apache.log4j.Logger; |
| import org.apache.rya.indexing.pcj.fluo.app.BindingSetRow; |
| import org.apache.rya.indexing.pcj.fluo.app.query.FluoQueryColumns; |
| import org.apache.rya.indexing.pcj.fluo.app.query.ProjectionMetadata; |
| import org.apache.rya.indexing.pcj.storage.accumulo.VisibilityBindingSet; |
| import org.apache.rya.indexing.pcj.storage.accumulo.VisibilityBindingSetSerDe; |
| |
| /** |
| * Performs incremental result exporting to the configured destinations. |
| */ |
| public class ProjectionObserver extends BindingSetUpdater { |
| private static final Logger log = Logger.getLogger(ProjectionObserver.class); |
| |
| private static final VisibilityBindingSetSerDe BS_SERDE = new VisibilityBindingSetSerDe(); |
| |
| @Override |
| public ObservedColumn getObservedColumn() { |
| return new ObservedColumn(FluoQueryColumns.PROJECTION_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 projectionNodeId = BindingSetRow.make(row).getNodeId(); |
| final ProjectionMetadata projectionMetadata = queryDao.readProjectionMetadata(tx, projectionNodeId); |
| |
| // Read the Visibility Binding Set from the value. |
| final Bytes valueBytes = tx.get(row, FluoQueryColumns.PROJECTION_BINDING_SET); |
| final VisibilityBindingSet projectionBindingSet = BS_SERDE.deserialize(valueBytes); |
| |
| // Figure out which node needs to handle the new metadata. |
| final String parentNodeId = projectionMetadata.getParentNodeId(); |
| |
| return new Observation(projectionNodeId, projectionBindingSet, parentNodeId); |
| } |
| } |