afedulov commented on code in PR #23777: URL: https://github.com/apache/flink/pull/23777#discussion_r1403389661
########## flink-connectors/flink-connector-datagen/src/main/java/org/apache/flink/connector/datagen/functions/IndexLookupGeneratorFunction.java: ########## @@ -0,0 +1,180 @@ +/* + * 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.datagen.functions; + +import org.apache.flink.annotation.Internal; +import org.apache.flink.annotation.VisibleForTesting; +import org.apache.flink.api.common.ExecutionConfig; +import org.apache.flink.api.common.typeinfo.TypeInformation; +import org.apache.flink.api.common.typeutils.TypeSerializer; +import org.apache.flink.api.connector.source.SourceReaderContext; +import org.apache.flink.connector.datagen.source.GeneratorFunction; +import org.apache.flink.core.memory.DataInputView; +import org.apache.flink.core.memory.DataInputViewStreamWrapper; +import org.apache.flink.core.memory.DataOutputViewStreamWrapper; +import org.apache.flink.util.Preconditions; + +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +import javax.annotation.Nullable; + +import java.io.ByteArrayInputStream; +import java.io.ByteArrayOutputStream; +import java.io.EOFException; +import java.io.IOException; +import java.util.HashMap; +import java.util.Map; +import java.util.NoSuchElementException; + +/** + * A stream generator function that returns elements from the collection based on their index. + * + * <p>This generator function serializes the elements using Flink's type information. That way, any + * object transport using Java serialization will not be affected by the serializability of the + * elements. + * + * @param <OUT> The type of elements returned by this function. + */ +@Internal +public class IndexLookupGeneratorFunction<OUT> implements GeneratorFunction<Long, OUT> { Review Comment: Do you mean `IndexLookupMapFunction` ? `GeneratorFunction` is a primary interface in the datagen connector and it is meant to work in a specific context of the SourceReader. Naming it a MapFunction would be a bit confusing. -- 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: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
