| /* |
| * 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.query; |
| |
| import static com.google.common.base.Preconditions.checkNotNull; |
| import static org.apache.rya.indexing.pcj.fluo.app.IncrementalUpdateConstants.STATEMENT_PATTERN_ID; |
| import static org.apache.rya.indexing.pcj.fluo.app.IncrementalUpdateConstants.VAR_DELIM; |
| import static org.apache.rya.indexing.pcj.fluo.app.query.FluoQueryColumns.STATEMENT_PATTERN_IDS; |
| import static org.apache.rya.indexing.pcj.fluo.app.query.FluoQueryColumns.STATEMENT_PATTERN_IDS_HASH; |
| |
| import java.util.HashSet; |
| import java.util.Set; |
| |
| import org.apache.fluo.api.client.TransactionBase; |
| import org.apache.fluo.api.data.Bytes; |
| |
| import com.google.common.base.Joiner; |
| import com.google.common.base.Optional; |
| import com.google.common.collect.Sets; |
| import com.google.common.hash.Hashing; |
| |
| /** |
| * Utility class for updating and removing StatementPattern nodeIds in the Fluo table. All StatementPattern nodeIds are |
| * stored in a single set under a single entry in the Fluo table. This is to eliminate the need for a scan to find all |
| * StatementPattern nodeIds every time a new Triple enters the Fluo table. Instead, the nodeIds are cached locally, and |
| * only updated when the local hash of the nodeId set is dirty (not equal to the hash in the Fluo table). |
| */ |
| public class StatementPatternIdManager { |
| |
| /** |
| * Add specified Set of ids to the Fluo table with Column {@link FluoQueryColumns#STATEMENT_PATTERN_IDS}. Also |
| * updates the hash of the updated nodeId Set and writes that to the Column |
| * {@link FluoQueryColumns#STATEMENT_PATTERN_IDS_HASH} |
| * |
| * @param tx - Fluo Transaction object for performing atomic operations on Fluo table. |
| * @param ids - ids to add to the StatementPattern nodeId Set |
| */ |
| public static void addStatementPatternIds(TransactionBase tx, Set<String> ids) { |
| checkNotNull(tx); |
| checkNotNull(ids); |
| Optional<Bytes> val = Optional.fromNullable(tx.get(Bytes.of(STATEMENT_PATTERN_ID), STATEMENT_PATTERN_IDS)); |
| StringBuilder builder = new StringBuilder(); |
| if (val.isPresent()) { |
| builder.append(val.get().toString()); |
| builder.append(VAR_DELIM); |
| } |
| String idString = builder.append(Joiner.on(VAR_DELIM).join(ids)).toString(); |
| tx.set(Bytes.of(STATEMENT_PATTERN_ID), STATEMENT_PATTERN_IDS, Bytes.of(idString)); |
| tx.set(Bytes.of(STATEMENT_PATTERN_ID), STATEMENT_PATTERN_IDS_HASH, Bytes.of(Hashing.sha256().hashString(idString).toString())); |
| } |
| |
| /** |
| * Remove specified Set of ids from the Fluo table and updates the entry with Column |
| * {@link FluoQueryColumns#STATEMENT_PATTERN_IDS}. Also updates the hash of the updated nodeId Set and writes that |
| * to the Column {@link FluoQueryColumns#STATEMENT_PATTERN_IDS_HASH} |
| * |
| * @param tx - Fluo Transaction object for performing atomic operations on Fluo table. |
| * @param ids - ids to remove from the StatementPattern nodeId Set |
| */ |
| public static void removeStatementPatternIds(TransactionBase tx, Set<String> ids) { |
| checkNotNull(tx); |
| checkNotNull(ids); |
| Optional<Bytes> val = Optional.fromNullable(tx.get(Bytes.of(STATEMENT_PATTERN_ID), STATEMENT_PATTERN_IDS)); |
| Set<String> storedIds = new HashSet<>(); |
| if (val.isPresent()) { |
| storedIds = Sets.newHashSet(val.get().toString().split(VAR_DELIM)); |
| } |
| storedIds.removeAll(ids); |
| String idString = Joiner.on(VAR_DELIM).join(ids); |
| tx.set(Bytes.of(STATEMENT_PATTERN_ID), STATEMENT_PATTERN_IDS, Bytes.of(idString)); |
| tx.set(Bytes.of(STATEMENT_PATTERN_ID), STATEMENT_PATTERN_IDS_HASH, Bytes.of(Hashing.sha256().hashString(idString).toString())); |
| } |
| |
| } |