| /* |
| * 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 java.util.Arrays; |
| |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.rya.indexing.pcj.storage.PrecomputedJoinStorage; |
| |
| import com.google.common.base.Optional; |
| import com.google.common.base.Supplier; |
| |
| import org.apache.rya.indexing.external.PrecomputedJoinIndexerConfig.PrecomputedJoinStorageType; |
| import org.apache.rya.indexing.external.accumulo.AccumuloPcjStorageSupplier; |
| |
| /** |
| * Creates an instance of {@link PrecomputedJoinStorage} based on the application's configuration. |
| */ |
| public class PrecomputedJoinStorageSupplier implements Supplier<PrecomputedJoinStorage> { |
| |
| private final Supplier<Configuration> configSupplier; |
| private final AccumuloPcjStorageSupplier accumuloSupplier; |
| |
| /** |
| * Constructs an instance of {@link PrecomputedJoinStorageSupplier}. |
| * |
| * @param configSupplier - Provides access to the configuration of the |
| * application used to initialize the storage. (not null) |
| * @param accumuloSupplier - Used to create an Accumulo instance of the |
| * storage if that is the configured type. (not null) |
| */ |
| public PrecomputedJoinStorageSupplier( |
| final Supplier<Configuration> configSupplier, |
| final AccumuloPcjStorageSupplier accumuloSupplier) { |
| this.configSupplier = checkNotNull(configSupplier); |
| this.accumuloSupplier = checkNotNull(accumuloSupplier); |
| } |
| |
| @Override |
| public PrecomputedJoinStorage get() { |
| // Ensure a configuration has been set. |
| final Configuration config = configSupplier.get(); |
| checkNotNull(config, "Could not build the PrecomputedJoinStorage until the PrecomputedJoinIndexer has been configured."); |
| |
| final PrecomputedJoinIndexerConfig indexerConfig = new PrecomputedJoinIndexerConfig(config); |
| |
| // Ensure the storage type has been set. |
| final Optional<PrecomputedJoinStorageType> storageType = indexerConfig.getPcjStorageType(); |
| checkArgument(storageType.isPresent(), "The '" + PrecomputedJoinIndexerConfig.PCJ_STORAGE_TYPE + |
| "' property must have one of the following values: " + Arrays.toString(PrecomputedJoinStorageType.values())); |
| |
| // Create and return the configured storage. |
| switch(storageType.get()) { |
| case ACCUMULO: |
| return accumuloSupplier.get(); |
| |
| default: |
| throw new IllegalArgumentException("Unsupported PrecomputedJoinStorageType: " + storageType.get()); |
| } |
| } |
| } |