rahil-c commented on code in PR #704: URL: https://github.com/apache/incubator-xtable/pull/704#discussion_r2080365149
########## xtable-service/src/main/java/org/apache/xtable/service/ConversionService.java: ########## @@ -0,0 +1,156 @@ +/* + * 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.xtable.service; + +import static org.apache.xtable.model.storage.TableFormat.DELTA; +import static org.apache.xtable.model.storage.TableFormat.HUDI; +import static org.apache.xtable.model.storage.TableFormat.ICEBERG; + +import java.util.ArrayList; +import java.util.List; + +import org.apache.commons.lang3.tuple.Pair; + +import com.google.common.annotations.VisibleForTesting; + +import org.apache.xtable.conversion.ConversionConfig; +import org.apache.xtable.conversion.ConversionController; +import org.apache.xtable.conversion.ConversionSourceProvider; +import org.apache.xtable.conversion.SourceTable; +import org.apache.xtable.conversion.TargetTable; +import org.apache.xtable.service.models.ConvertTableRequest; +import org.apache.xtable.service.models.ConvertTableResponse; +import org.apache.xtable.service.models.ConvertedTable; +import org.apache.xtable.service.spark.SparkHolder; +import org.apache.xtable.service.utils.ConversionServiceUtil; + +import jakarta.enterprise.context.ApplicationScoped; +import jakarta.inject.Inject; + +/** + * Service for managing table format conversions. + * + * <p>It supports formats such as ICEBERG, HUDI, and DELTA. The conversion process involves creating + * a source table, generating target tables, and then executing the conversion via a designated + * conversion controller. + */ +@ApplicationScoped +public class ConversionService { + private final SparkHolder sparkHolder; + private final ConversionController conversionController; + private final ConversionServiceUtil conversionServiceUtil; + + /** + * Constructs a ConversionService instance with required dependencies. + * + * @param sparkHolder the Spark holder instance containing the Spark context and configuration + * @param conversionServiceUtil utility for handling metadata operations + */ + @Inject + public ConversionService(SparkHolder sparkHolder, ConversionServiceUtil conversionServiceUtil) { + this.sparkHolder = sparkHolder; + this.conversionServiceUtil = conversionServiceUtil; + this.conversionController = new ConversionController(sparkHolder.jsc().hadoopConfiguration()); + } + + /** + * Constructs a ConversionService instance using dependency injection for testing. + * + * @param sparkHolder the Spark holder instance + * @param conversionController a preconfigured conversion controller + * @param conversionServiceUtil utility for handling metadata operations + */ + @VisibleForTesting + public ConversionService( + SparkHolder sparkHolder, + ConversionServiceUtil conversionServiceUtil, + ConversionController conversionController) { + this.sparkHolder = sparkHolder; + this.conversionController = conversionController; + this.conversionServiceUtil = conversionServiceUtil; + } + + /** + * Converts a source table to one or more target table formats. + * + * <p>The method builds a SourceTable based on the request parameters and constructs corresponding + * TargetTable instances for each target format. It then performs a synchronous conversion through + * the conversion controller. After conversion, it retrieves schema and metadata paths for each + * target table. + * + * @param convertTableRequest the conversion request containing source table details and target + * formats + * @return a response containing details of converted target tables + */ + public ConvertTableResponse convertTable(ConvertTableRequest convertTableRequest) { + SourceTable sourceTable = + SourceTable.builder() + .name(convertTableRequest.getSourceTableName()) + .basePath(convertTableRequest.getSourceTablePath()) + .formatName(convertTableRequest.getSourceFormat()) + .build(); + + List<TargetTable> targetTables = new ArrayList<>(); + for (String targetFormat : convertTableRequest.getTargetFormats()) { + TargetTable targetTable = + TargetTable.builder() + .name(convertTableRequest.getSourceTableName()) + .basePath(convertTableRequest.getSourceTablePath()) + .formatName(targetFormat) + .build(); + targetTables.add(targetTable); + } + + ConversionConfig conversionConfig = + ConversionConfig.builder().sourceTable(sourceTable).targetTables(targetTables).build(); + + ConversionSourceProvider<?> conversionSourceProvider = + conversionServiceUtil.getConversionSourceProvider( + convertTableRequest.getSourceFormat(), sparkHolder.jsc().hadoopConfiguration()); + + conversionController.sync(conversionConfig, conversionSourceProvider); + + List<ConvertedTable> restTargetTables = new ArrayList<>(); + for (String targetFormat : convertTableRequest.getTargetFormats()) { + if (targetFormat.equals(ICEBERG)) { + Pair<String, String> responseFields = + conversionServiceUtil.getIcebergSchemaAndMetadataPath( + convertTableRequest.getSourceTablePath(), sparkHolder.jsc().hadoopConfiguration()); + ConvertedTable icebergTable = + new ConvertedTable(ICEBERG, responseFields.getLeft(), responseFields.getRight()); + restTargetTables.add(icebergTable); + } else if (targetFormat.equals(HUDI)) { + Pair<String, String> responseFields = + conversionServiceUtil.getHudiSchemaAndMetadataPath( + convertTableRequest.getSourceTablePath(), sparkHolder.jsc().hadoopConfiguration()); + ConvertedTable hudiTable = + new ConvertedTable(HUDI, responseFields.getLeft(), responseFields.getRight()); + restTargetTables.add(hudiTable); + } else if (targetFormat.equals(DELTA)) { + Pair<String, String> responseFields = + conversionServiceUtil.getDeltaSchemaAndMetadataPath( + convertTableRequest.getSourceTablePath(), sparkHolder.spark()); + ConvertedTable deltaTable = + new ConvertedTable(DELTA, responseFields.getLeft(), responseFields.getRight()); + restTargetTables.add(deltaTable); + } Review Comment: will try taking a look at this. -- This is an automated message from the Apache Git Service. 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