Lehel44 commented on a change in pull request #4948: URL: https://github.com/apache/nifi/pull/4948#discussion_r663994801
########## File path: nifi-nar-bundles/nifi-scripting-bundle/nifi-scripting-processors/src/main/java/org/apache/nifi/processors/script/RecordBatchingProcessorFlowFileBuilder.java ########## @@ -0,0 +1,101 @@ +/* + * 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.nifi.processors.script; + +import org.apache.nifi.flowfile.FlowFile; +import org.apache.nifi.processor.ProcessSession; +import org.apache.nifi.processor.exception.ProcessException; +import org.apache.nifi.serialization.RecordSetWriter; +import org.apache.nifi.serialization.WriteResult; +import org.apache.nifi.serialization.record.Record; + +import java.io.IOException; +import java.io.OutputStream; +import java.util.HashMap; +import java.util.LinkedList; +import java.util.List; +import java.util.Map; +import java.util.Set; +import java.util.function.BiFunction; +import java.util.stream.Collectors; + +/** + * Helper class contains all the information necessary to prepare an outgoing flow file. + */ +final class RecordBatchingProcessorFlowFileBuilder { + private final ProcessSession session; + private final FlowFile incomingFlowFile; + final private FlowFile outgoingFlowFile; + private final OutputStream out; + private final RecordSetWriter writer; + private final List<Map<String, String>> attributes = new LinkedList<>(); + + private int recordCount = 0; + + RecordBatchingProcessorFlowFileBuilder( + final FlowFile incomingFlowFile, + final ProcessSession session, + final BiFunction<FlowFile, OutputStream, RecordSetWriter> recordSetWriterSupplier + ) throws IOException { + this.session = session; + this.incomingFlowFile = incomingFlowFile; + this.outgoingFlowFile = session.create(incomingFlowFile); + this.out = session.write(outgoingFlowFile); + this.writer = recordSetWriterSupplier.apply(outgoingFlowFile, out); + this.writer.beginRecordSet(); + } + + int addRecord(final Record record) throws IOException { + final WriteResult writeResult = writer.write(record); + attributes.add(writeResult.getAttributes()); + recordCount += writeResult.getRecordCount(); + return recordCount; + } + + private Map<String, String> getWriteAttributes() { + final Map<String, String> result = new HashMap<>(); + final Set<String> attributeNames = attributes.stream().map(a -> a.keySet()).flatMap(x -> x.stream()).collect(Collectors.toSet()); Review comment: Minor: You can use method reference here: ```suggestion final Set<String> attributeNames = attributes.stream().map(Map::keySet).flatMap(Collection::stream).collect(Collectors.toSet()); ``` -- 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]
