Jiabao-Sun commented on code in PR #1: URL: https://github.com/apache/flink-connector-mongodb/pull/1#discussion_r1012085964
########## flink-connector-mongodb/src/main/java/org/apache/flink/connector/mongodb/source/MongoSourceBuilder.java: ########## @@ -0,0 +1,219 @@ +/* + * 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.connector.mongodb.source; + +import org.apache.flink.annotation.PublicEvolving; +import org.apache.flink.configuration.MemorySize; +import org.apache.flink.connector.mongodb.common.config.MongoConnectionOptions; +import org.apache.flink.connector.mongodb.source.config.MongoReadOptions; +import org.apache.flink.connector.mongodb.source.enumerator.splitter.PartitionStrategy; +import org.apache.flink.connector.mongodb.source.reader.deserializer.MongoDeserializationSchema; + +import org.bson.BsonDocument; + +import java.util.Arrays; +import java.util.List; + +import static org.apache.flink.util.CollectionUtil.isNullOrEmpty; +import static org.apache.flink.util.Preconditions.checkArgument; +import static org.apache.flink.util.Preconditions.checkNotNull; + +/** + * The builder class for {@link MongoSource} to make it easier for the users to construct a {@link + * MongoSource}. + * + * @param <OUT> The output type of the source. + */ +@PublicEvolving +public class MongoSourceBuilder<OUT> { + + private final MongoConnectionOptions.MongoConnectionOptionsBuilder connectionOptionsBuilder; + private final MongoReadOptions.MongoReadOptionsBuilder readOptionsBuilder; + + private List<String> projectedFields; + private int limit = -1; + private MongoDeserializationSchema<OUT> deserializationSchema; + + MongoSourceBuilder() { + this.connectionOptionsBuilder = MongoConnectionOptions.builder(); + this.readOptionsBuilder = MongoReadOptions.builder(); + } + + /** + * Sets the connection string of MongoDB. + * + * @param uri connection string of MongoDB + * @return this builder + */ + public MongoSourceBuilder<OUT> setUri(String uri) { + connectionOptionsBuilder.setUri(uri); + return this; + } + + /** + * Sets the database to sink of MongoDB. + * + * @param database the database to sink of MongoDB. + * @return this builder + */ + public MongoSourceBuilder<OUT> setDatabase(String database) { + connectionOptionsBuilder.setDatabase(database); + return this; + } + + /** + * Sets the collection to sink of MongoDB. + * + * @param collection the collection to sink of MongoDB. + * @return this builder + */ + public MongoSourceBuilder<OUT> setCollection(String collection) { + connectionOptionsBuilder.setCollection(collection); + return this; + } + + /** + * Sets the number of documents should be fetched per round-trip when reading. + * + * @param fetchSize the number of documents should be fetched per round-trip when reading. + * @return this builder + */ + public MongoSourceBuilder<OUT> setFetchSize(int fetchSize) { + readOptionsBuilder.setFetchSize(fetchSize); + return this; + } + + /** + * Sets the batch size of MongoDB find cursor. + * + * @param cursorBatchSize the max batch size of find cursor. + * @return this builder + */ + public MongoSourceBuilder<OUT> setCursorBatchSize(int cursorBatchSize) { + readOptionsBuilder.setCursorBatchSize(cursorBatchSize); + return this; + } + + /** + * Set this option to true to prevent cursor timeout (defaults to 10 minutes). + * + * @param noCursorTimeout Set this option to true to prevent cursor timeout. + * @return this builder + */ + public MongoSourceBuilder<OUT> setNoCursorTimeout(boolean noCursorTimeout) { + readOptionsBuilder.setNoCursorTimeout(noCursorTimeout); + return this; + } + + /** + * Sets the partition strategy. + * + * @param partitionStrategy the strategy of a partition. + * @return this builder + */ + public MongoSourceBuilder<OUT> setPartitionStrategy(PartitionStrategy partitionStrategy) { + readOptionsBuilder.setPartitionStrategy(partitionStrategy); + return this; + } + + /** + * Sets the partition size of MongoDB split. + * + * @param partitionSize the memory size of a partition. + * @return this builder + */ + public MongoSourceBuilder<OUT> setPartitionSize(MemorySize partitionSize) { + readOptionsBuilder.setPartitionSize(partitionSize); + return this; + } + + /** + * Sets the samples size per partition only effective for sample partition strategy. + * + * @param samplesPerPartition the samples size per partition + * @return this builder + */ + public MongoSourceBuilder<OUT> setSamplesPerPartition(int samplesPerPartition) { + readOptionsBuilder.setSamplesPerPartition(samplesPerPartition); + return this; + } + + /** + * Sets the limit of documents to read. Review Comment: If limit is not set, the documents of the entire collection will be read. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: issues-unsubscr...@flink.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org
