| /* |
| * 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.flink.connectors.kudu.connector.writer; |
| |
| import org.apache.flink.annotation.PublicEvolving; |
| |
| import org.apache.kudu.client.KuduTable; |
| import org.apache.kudu.client.Operation; |
| import org.apache.kudu.client.PartialRow; |
| |
| import java.util.Collections; |
| import java.util.List; |
| import java.util.Optional; |
| |
| /** |
| * Base implementation for {@link KuduOperationMapper}s that have one-to-one input to |
| * Kudu operation mapping. It requires a fixed table schema to be provided at construction |
| * time and only requires users to implement a getter for a specific column index (relative |
| * to the ones provided in the constructor). |
| * <br> |
| * Supports both fixed operation type per record by specifying the {@link KuduOperation} or a |
| * custom implementation for creating the base {@link Operation} throwugh the |
| * {@link #createBaseOperation(Object, KuduTable)} method. |
| * |
| * @param <T> Input type |
| */ |
| @PublicEvolving |
| public abstract class AbstractSingleOperationMapper<T> implements KuduOperationMapper<T> { |
| |
| protected final String[] columnNames; |
| private final KuduOperation operation; |
| |
| protected AbstractSingleOperationMapper(String[] columnNames) { |
| this(columnNames, null); |
| } |
| |
| public AbstractSingleOperationMapper(String[] columnNames, KuduOperation operation) { |
| this.columnNames = columnNames; |
| this.operation = operation; |
| } |
| |
| /** |
| * Returns the object corresponding to the given column index. |
| * |
| * @param input Input element |
| * @param i Column index |
| * @return Column value |
| */ |
| public abstract Object getField(T input, int i); |
| |
| public Optional<Operation> createBaseOperation(T input, KuduTable table) { |
| if (operation == null) { |
| throw new UnsupportedOperationException("createBaseOperation must be overridden if no operation specified in constructor"); |
| } |
| switch (operation) { |
| case INSERT: |
| return Optional.of(table.newInsert()); |
| case UPDATE: |
| return Optional.of(table.newUpdate()); |
| case UPSERT: |
| return Optional.of(table.newUpsert()); |
| case DELETE: |
| return Optional.of(table.newDelete()); |
| default: |
| throw new RuntimeException("Unknown operation " + operation); |
| } |
| } |
| |
| @Override |
| public List<Operation> createOperations(T input, KuduTable table) { |
| Optional<Operation> operationOpt = createBaseOperation(input, table); |
| if (!operationOpt.isPresent()) { |
| return Collections.emptyList(); |
| } |
| |
| Operation operation = operationOpt.get(); |
| PartialRow partialRow = operation.getRow(); |
| |
| for (int i = 0; i < columnNames.length; i++) { |
| partialRow.addObject(columnNames[i], getField(input, i)); |
| } |
| |
| return Collections.singletonList(operation); |
| } |
| |
| public enum KuduOperation { |
| INSERT, |
| UPDATE, |
| UPSERT, |
| DELETE |
| } |
| } |