| /* |
| * 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.samza.sql.translator; |
| |
| import java.util.List; |
| import java.util.Objects; |
| import org.apache.calcite.rel.core.JoinRelType; |
| import org.apache.samza.context.Context; |
| import org.apache.samza.operators.KV; |
| import org.apache.samza.sql.SamzaSqlRelRecord; |
| import org.apache.samza.sql.data.SamzaSqlRelMessage; |
| import org.apache.samza.sql.interfaces.SamzaRelConverter; |
| import org.apache.samza.sql.interfaces.SamzaRelTableKeyConverter; |
| import org.apache.samza.sql.runner.SamzaSqlApplicationContext; |
| |
| |
| /** |
| * This class joins incoming {@link SamzaSqlRelMessage} with records {@link KV} from a remote table with the join key |
| * defined by the format of the table key. |
| */ |
| public class SamzaSqlRemoteTableJoinFunction |
| extends SamzaSqlTableJoinFunction<Object, KV> { |
| |
| private transient SamzaRelConverter msgConverter; |
| private transient SamzaRelTableKeyConverter relTableKeyConverter; |
| private final String tableName; |
| private final int queryId; |
| |
| SamzaSqlRemoteTableJoinFunction(SamzaRelConverter msgConverter, SamzaRelTableKeyConverter tableKeyConverter, |
| JoinInputNode streamNode, JoinInputNode tableNode, JoinRelType joinRelType, int queryId) { |
| super(streamNode, tableNode, joinRelType); |
| |
| this.msgConverter = msgConverter; |
| this.relTableKeyConverter = tableKeyConverter; |
| this.tableName = tableNode.getSourceName(); |
| this.queryId = queryId; |
| } |
| |
| @Override |
| public void init(Context context) { |
| TranslatorContext translatorContext = |
| ((SamzaSqlApplicationContext) context.getApplicationTaskContext()).getTranslatorContexts().get(queryId); |
| this.msgConverter = translatorContext.getMsgConverter(tableName); |
| this.relTableKeyConverter = translatorContext.getTableKeyConverter(tableName); |
| } |
| |
| @Override |
| protected List<Object> getTableRelRecordFieldValues(KV record) { |
| // Using the message rel converter, convert message to sql rel message and add to output values. |
| SamzaSqlRelMessage relMessage = msgConverter.convertToRelMessage(record); |
| return relMessage.getSamzaSqlRelRecord().getFieldValues(); |
| } |
| |
| @Override |
| public Object getMessageKey(SamzaSqlRelMessage message) { |
| SamzaSqlRelRecord keyRecord = getMessageKeyRelRecord(message); |
| // If all the message key rel record values are null, return null message key. |
| if (keyRecord.getFieldValues().stream().allMatch(Objects::isNull)) { |
| return null; |
| } |
| // Using the table key converter, convert message key from rel format to the record key format. |
| return relTableKeyConverter.convertToTableKeyFormat(keyRecord); |
| } |
| |
| @Override |
| public Object getRecordKey(KV record) { |
| return record.getKey(); |
| } |
| } |