| /** |
| * 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.sqoop.metastore; |
| |
| import java.util.List; |
| import java.util.Map; |
| |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.sqoop.config.ConfigurationHelper; |
| |
| /** |
| * Factory that produces the correct JobStorage system to work with |
| * a particular job descriptor. |
| */ |
| public class JobStorageFactory { |
| |
| private Configuration conf; |
| |
| /** |
| * Configuration key describing the list of JobStorage implementations |
| * to use to handle jobs. |
| */ |
| public static final String AVAILABLE_STORAGES_KEY = |
| "sqoop.job.storage.implementations"; |
| |
| /** The default list of available JobStorage implementations. */ |
| private static final String DEFAULT_AVAILABLE_STORAGES = |
| "org.apache.sqoop.metastore.GenericJobStorage," |
| + "org.apache.sqoop.metastore.AutoGenericJobStorage"; |
| |
| public JobStorageFactory(Configuration config) { |
| this.conf = config; |
| |
| // Ensure that we always have an available storages list. |
| if (this.conf.get(AVAILABLE_STORAGES_KEY) == null) { |
| this.conf.set(AVAILABLE_STORAGES_KEY, DEFAULT_AVAILABLE_STORAGES); |
| } |
| } |
| |
| /** |
| * Given a storage descriptor, determine the correct JobStorage |
| * implementation to use to connect to the storage resource and return an |
| * instance of it -- or null if no JobStorage instance is appropriate. |
| */ |
| public JobStorage getJobStorage(Map<String, String> descriptor) { |
| List<JobStorage> storages = ConfigurationHelper.getInstances( |
| conf, AVAILABLE_STORAGES_KEY, JobStorage.class); |
| for (JobStorage stor : storages) { |
| if (stor.canAccept(descriptor)) { |
| return stor; |
| } |
| } |
| |
| return null; |
| } |
| } |
| |