| /* |
| * 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.drill.metastore.mongo.operate; |
| |
| import com.mongodb.client.ClientSession; |
| import org.apache.drill.metastore.mongo.MongoMetastoreContext; |
| import org.apache.drill.metastore.mongo.transform.OperationTransformer; |
| import org.apache.drill.metastore.operate.AbstractModify; |
| import org.apache.drill.metastore.operate.Delete; |
| import org.apache.drill.metastore.operate.MetadataTypeValidator; |
| import org.apache.drill.metastore.operate.Modify; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.List; |
| |
| /** |
| * Implementation of {@link Modify} interface based on {@link AbstractModify} parent class. |
| * Modifies information in Mongo collection based on given overwrite or delete operations. |
| * Executes given operations in one transaction. |
| * |
| * @param <T> Metastore component unit type |
| */ |
| public class MongoModify<T> extends AbstractModify<T> { |
| private static final Logger logger = LoggerFactory.getLogger(MongoModify.class); |
| |
| private final OperationTransformer<T> transformer; |
| private final MongoMetastoreContext<T> context; |
| private final List<MongoOperation> operations = new ArrayList<>(); |
| |
| public MongoModify(MetadataTypeValidator metadataTypeValidator, MongoMetastoreContext<T> context) { |
| super(metadataTypeValidator); |
| this.context = context; |
| this.transformer = context.transformer().operation(); |
| } |
| |
| @Override |
| public void execute() { |
| if (operations.isEmpty()) { |
| return; |
| } |
| executeOperations(operations); |
| } |
| |
| @Override |
| public void purge() { |
| executeOperations(Collections.singletonList(transformer.toDeleteAll())); |
| } |
| |
| @Override |
| protected void addOverwrite(List<T> units) { |
| operations.addAll(transformer.toOverwrite(units)); |
| } |
| |
| @Override |
| protected void addDelete(Delete delete) { |
| operations.add(transformer.toDelete(delete)); |
| } |
| |
| private void executeOperations(List<MongoOperation> operations) { |
| ClientSession clientSession = context.client().startSession(); |
| String res = clientSession.withTransaction(() -> { |
| operations.forEach(o -> o.execute(context.table())); |
| return String.format("executed %s operations", operations.size()); |
| }); |
| logger.debug(res); |
| } |
| } |