derrickaw commented on code in PR #38376: URL: https://github.com/apache/beam/pull/38376#discussion_r3201796685
########## sdks/java/io/mongodb/src/main/java/org/apache/beam/sdk/io/mongodb/MongoDbWriteSchemaTransformProvider.java: ########## @@ -0,0 +1,201 @@ +/* + * 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.beam.sdk.io.mongodb; + +import com.google.auto.service.AutoService; +import java.util.ArrayList; +import java.util.Collections; +import java.util.List; +import java.util.Map; +import org.apache.beam.sdk.schemas.Schema.Field; +import org.apache.beam.sdk.schemas.transforms.SchemaTransform; +import org.apache.beam.sdk.schemas.transforms.SchemaTransformProvider; +import org.apache.beam.sdk.schemas.transforms.TypedSchemaTransformProvider; +import org.apache.beam.sdk.schemas.transforms.providers.ErrorHandling; +import org.apache.beam.sdk.transforms.DoFn; +import org.apache.beam.sdk.transforms.ParDo; +import org.apache.beam.sdk.values.PCollection; +import org.apache.beam.sdk.values.PCollectionRowTuple; +import org.apache.beam.sdk.values.PCollectionTuple; +import org.apache.beam.sdk.values.Row; +import org.apache.beam.sdk.values.TupleTag; +import org.apache.beam.sdk.values.TupleTagList; +import org.bson.Document; +import org.checkerframework.checker.nullness.qual.Nullable; + +/** An implementation of {@link TypedSchemaTransformProvider} for writing to MongoDB. */ +@AutoService(SchemaTransformProvider.class) +public class MongoDbWriteSchemaTransformProvider + extends TypedSchemaTransformProvider<MongoDbWriteSchemaTransformConfiguration> { + + private static final String INPUT_TAG = "input"; + public static final TupleTag<Document> OUTPUT_TAG = new TupleTag<Document>() {}; + public static final TupleTag<Row> ERROR_TAG = new TupleTag<Row>() {}; + + private static final org.apache.beam.sdk.metrics.Counter errorCounter = + org.apache.beam.sdk.metrics.Metrics.counter( + MongoDbWriteSchemaTransformProvider.class, "MongoDB-write-error-counter"); + + @Override + protected SchemaTransform from(MongoDbWriteSchemaTransformConfiguration configuration) { + return new MongoDbWriteSchemaTransform(configuration); + } + + @Override + public String identifier() { + return "beam:schematransform:org.apache.beam:mongodb_write:v1"; + } + + @Override + public List<String> inputCollectionNames() { + return Collections.singletonList(INPUT_TAG); + } + + /** The {@link SchemaTransform} that performs the write operation. */ + private static class MongoDbWriteSchemaTransform extends SchemaTransform { + private final MongoDbWriteSchemaTransformConfiguration configuration; + + MongoDbWriteSchemaTransform(MongoDbWriteSchemaTransformConfiguration configuration) { + configuration.validate(); + this.configuration = configuration; + } + + @Override + public PCollectionRowTuple expand(PCollectionRowTuple input) { + // Retrieve the input PCollection of Rows and its schema. + PCollection<Row> rows = input.get(INPUT_TAG); + org.apache.beam.sdk.schemas.Schema inputSchema = rows.getSchema(); + + // Determine if error handling is enabled and set up the error schema. + boolean handleErrors = ErrorHandling.hasOutput(configuration.getErrorHandling()); + org.apache.beam.sdk.schemas.Schema errorSchema = ErrorHandling.errorSchema(inputSchema); + + // Convert Beam Rows to BSON Documents, emitting errors to a separate tag if enabled. + PCollectionTuple outputTuple = + rows.apply( + "ConvertToDocument", + ParDo.of(new RowToBsonDocumentFn(handleErrors, errorSchema)) + .withOutputTags(OUTPUT_TAG, TupleTagList.of(ERROR_TAG))); + + PCollection<Document> documents = outputTuple.get(OUTPUT_TAG); + + // Configure the MongoDB write operation. + MongoDbIO.Write write = + MongoDbIO.write() + .withUri(configuration.getUri()) + .withDatabase(configuration.getDatabase()) + .withCollection(configuration.getCollection()); + + Long batchSize = configuration.getBatchSize(); + if (batchSize != null) { + write = write.withBatchSize(batchSize); + } + + // Apply the MongoDB write transform. + documents.apply("WriteToMongo", write); + + // Extract and format the error collection. + PCollection<Row> errorOutput = outputTuple.get(ERROR_TAG).setRowSchema(errorSchema); + + // Return the error collection as specified by the configuration. + ErrorHandling errorHandling = configuration.getErrorHandling(); + return PCollectionRowTuple.of( + (handleErrors && errorHandling != null) ? errorHandling.getOutput() : "errors", + errorOutput); + } + } + + /** Converts a Beam {@link Row} to a BSON {@link Document}. */ + static class RowToBsonDocumentFn extends DoFn<Row, Document> { + private final boolean handleErrors; + private final org.apache.beam.sdk.schemas.Schema errorSchema; + + RowToBsonDocumentFn(boolean handleErrors, org.apache.beam.sdk.schemas.Schema errorSchema) { + this.handleErrors = handleErrors; + this.errorSchema = errorSchema; + } + + @ProcessElement + public void processElement(@Element Row row, MultiOutputReceiver receiver) { + try { + Object converted = convertToBsonValue(row); + if (converted instanceof Document) { + receiver.get(OUTPUT_TAG).output((Document) converted); + } else { + throw new IllegalStateException( + "Expected Document but got " + + (converted != null ? converted.getClass().getName() : "null")); + } + } catch (Exception e) { + if (!handleErrors) { + throw new RuntimeException(e); + } + errorCounter.inc(); + receiver.get(ERROR_TAG).output(ErrorHandling.errorRecord(errorSchema, row, e)); + } + } + } + + private static @Nullable Object convertToBsonValue(@Nullable Object value) { + if (value == null) { + return null; + } + if (value instanceof Row) { + Row row = (Row) value; + Document doc = new Document(); + for (Field field : row.getSchema().getFields()) { + Object fieldValue = row.getValue(field.getName()); + Object convertedValue = convertToBsonValue(fieldValue); + if (convertedValue != null) { + doc.append(field.getName(), convertedValue); + } + } + return doc; + } else if (value instanceof List) { + List<?> list = (List<?>) value; + List<Object> bsonList = new ArrayList<>(list.size()); + for (Object item : list) { + Object convertedItem = convertToBsonValue(item); + if (convertedItem != null) { + bsonList.add(convertedItem); + } + } + return bsonList; + } else if (value instanceof Iterable) { + List<Object> bsonList = new ArrayList<>(); + for (Object item : (Iterable<?>) value) { + Object convertedItem = convertToBsonValue(item); + if (convertedItem != null) { + bsonList.add(convertedItem); + } + } + return bsonList; + } else if (value instanceof Map) { + Map<?, ?> map = (Map<?, ?>) value; + Document doc = new Document(); + for (Map.Entry<?, ?> entry : map.entrySet()) { + Object convertedValue = convertToBsonValue(entry.getValue()); + if (convertedValue != null) { + doc.append(String.valueOf(entry.getKey()), convertedValue); + } Review Comment: done -- This is an automated message from the Apache Git Service. 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