| /* |
| * 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.external; |
| |
| import static com.google.common.base.Preconditions.checkArgument; |
| import static com.google.common.base.Preconditions.checkNotNull; |
| |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.rya.indexing.pcj.update.PrecomputedJoinUpdater; |
| |
| import com.google.common.base.Optional; |
| import com.google.common.base.Supplier; |
| |
| import org.apache.rya.indexing.external.PrecomputedJoinIndexerConfig.PrecomputedJoinUpdaterType; |
| import org.apache.rya.indexing.external.fluo.FluoPcjUpdaterSupplier; |
| |
| /** |
| * Creates instance of {@link PrecomputedJoinUpdater} based on the application's configuration. |
| */ |
| public class PrecomputedJoinUpdaterSupplier implements Supplier<PrecomputedJoinUpdater> { |
| |
| private final Supplier<Configuration> configSupplier; |
| private final FluoPcjUpdaterSupplier fluoSupplier; |
| |
| /** |
| * Creates an instance of {@link PrecomputedJoinUpdaterSupplier}. |
| * |
| * @param configSupplier - Provides access to the configuration of the |
| * application used to initialize the updater. (not null) |
| * @param fluoSupplier - Used to create a Fluo instace of the updater |
| * if that is the configured type. (not null) |
| */ |
| public PrecomputedJoinUpdaterSupplier( |
| final Supplier<Configuration> configSupplier, |
| final FluoPcjUpdaterSupplier fluoSupplier) { |
| this.configSupplier = checkNotNull(configSupplier); |
| this.fluoSupplier = checkNotNull(fluoSupplier); |
| } |
| |
| @Override |
| public PrecomputedJoinUpdater get() { |
| // Ensure a configuration has been set. |
| final Configuration config = configSupplier.get(); |
| checkNotNull(config, "Can not build the PrecomputedJoinUpdater until the PrecomputedJoinIndexer has been configured."); |
| |
| final PrecomputedJoinIndexerConfig indexerConfig = new PrecomputedJoinIndexerConfig(config); |
| |
| // Ensure an updater type has been set. |
| final Optional<PrecomputedJoinUpdaterType> updaterType = indexerConfig.getPcjUpdaterType(); |
| checkArgument(updaterType.isPresent(), "The '" + PrecomputedJoinIndexerConfig.PCJ_UPDATER_TYPE + |
| "' property must have one of the following values: " + PrecomputedJoinUpdaterType.values()); |
| |
| // Create and return the configured updater. |
| switch(updaterType.get()) { |
| case FLUO: |
| return fluoSupplier.get(); |
| |
| default: |
| throw new IllegalArgumentException("Unsupported PrecomputedJoinUpdaterType: " + updaterType.get()); |
| } |
| } |
| } |