Github user phrocker commented on a diff in the pull request: https://github.com/apache/nifi/pull/1618#discussion_r107914548 --- Diff: nifi-nar-bundles/nifi-standard-bundle/nifi-standard-processors/src/main/java/org/apache/nifi/processors/standard/db/impl/mysql/event/io/DeleteRowsWriter.java --- @@ -0,0 +1,90 @@ +/* + * 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.standard.db.impl.mysql.event.io; + +import org.apache.nifi.flowfile.FlowFile; +import org.apache.nifi.processor.ProcessSession; +import org.apache.nifi.processors.standard.GetChangeDataCaptureMySQL; +import org.apache.nifi.processors.standard.db.event.ColumnDefinition; +import org.apache.nifi.processors.standard.db.impl.mysql.event.DeleteRowsEventInfo; + +import java.io.IOException; +import java.io.Serializable; +import java.util.BitSet; +import java.util.concurrent.atomic.AtomicLong; + +import static org.apache.nifi.processors.standard.db.impl.mysql.MySQLCDCUtils.getWritableObject; + +/** + * A writer class to output MySQL binlog "delete rows" events to flow file(s). + */ +public class DeleteRowsWriter extends AbstractBinlogTableEventWriter<DeleteRowsEventInfo> { + + /** + * Creates and transfers a new flow file whose contents are the JSON-serialized value of the specified event, and the sequence ID attribute set + * + * @param session A reference to a ProcessSession from which the flow file(s) will be created and transferred + * @param eventInfo An event whose value will become the contents of the flow file + * @return The next available CDC sequence ID for use by the CDC processor + */ + public long writeEvent(final ProcessSession session, final DeleteRowsEventInfo eventInfo, final long currentSequenceId) { + final AtomicLong seqId = new AtomicLong(currentSequenceId); --- End diff -- Why use atomic long? Seems to me that CAS is unnecessary unless I'm missing something.
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