echauchot commented on code in PR #19680: URL: https://github.com/apache/flink/pull/19680#discussion_r877234797
########## flink-connectors/flink-connector-cassandra/src/main/java/org/apache/flink/batch/connectors/cassandra/CassandraColumnarOutputFormatBase.java: ########## @@ -0,0 +1,68 @@ +/* + * 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.batch.connectors.cassandra; + +import org.apache.flink.streaming.connectors.cassandra.ClusterBuilder; +import org.apache.flink.util.Preconditions; + +import org.apache.flink.shaded.guava30.com.google.common.base.Strings; + +import com.datastax.driver.core.PreparedStatement; +import com.datastax.driver.core.ResultSet; +import com.google.common.util.concurrent.ListenableFuture; + +import java.io.IOException; +import java.time.Duration; + +/** + * CassandraColumnarOutputFormatBase is the common abstract class for writing into Apache Cassandra + * using column based output formats. + * + * @param <OUT> Type of the elements to write. + */ +abstract class CassandraColumnarOutputFormatBase<OUT> + extends CassandraOutputFormatBase<OUT, ResultSet> { + private final String insertQuery; + private transient PreparedStatement prepared; + + public CassandraColumnarOutputFormatBase( + String insertQuery, + ClusterBuilder builder, + int maxConcurrentRequests, + Duration maxConcurrentRequestsTimeout) { + super(builder, maxConcurrentRequests, maxConcurrentRequestsTimeout); + Preconditions.checkArgument( + !Strings.isNullOrEmpty(insertQuery), "Query cannot be null or empty"); + this.insertQuery = insertQuery; + } + + /** Opens a Session to Cassandra and initializes the prepared statement. */ + @Override + public void open(int taskNumber, int numTasks) throws IOException { + super.open(taskNumber, numTasks); + this.prepared = session.prepare(insertQuery); + } + + @Override + public ListenableFuture<ResultSet> send(OUT record) { Review Comment: :+1: -- 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]
