read/streaming/ContinuousPartitionReaderFactory.java

0001 /*
0002  * Licensed to the Apache Software Foundation (ASF) under one or more
0003  * contributor license agreements.  See the NOTICE file distributed with
0004  * this work for additional information regarding copyright ownership.
0005  * The ASF licenses this file to You under the Apache License, Version 2.0
0006  * (the "License"); you may not use this file except in compliance with
0007  * the License.  You may obtain a copy of the License at
0008  *
0009  *    http://www.apache.org/licenses/LICENSE-2.0
0010  *
0011  * Unless required by applicable law or agreed to in writing, software
0012  * distributed under the License is distributed on an "AS IS" BASIS,
0013  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
0014  * See the License for the specific language governing permissions and
0015  * limitations under the License.
0016  */
0017
0018 package org.apache.spark.sql.connector.read.streaming;
0019
0020 import org.apache.spark.annotation.Evolving;
0021 import org.apache.spark.sql.catalyst.InternalRow;
0022 import org.apache.spark.sql.connector.read.InputPartition;
0023 import org.apache.spark.sql.connector.read.PartitionReader;
0024 import org.apache.spark.sql.connector.read.PartitionReaderFactory;
0025 import org.apache.spark.sql.vectorized.ColumnarBatch;
0026
0027 /**
0028  * A variation on {@link PartitionReaderFactory} that returns {@link ContinuousPartitionReader}
0029  * instead of {@link PartitionReader}. It's used for continuous streaming processing.
0030  *
0031  * @since 3.0.0
0032  */
0033 @Evolving
0034 public interface ContinuousPartitionReaderFactory extends PartitionReaderFactory {
0035   @Override
0036   ContinuousPartitionReader<InternalRow> createReader(InputPartition partition);
0037
0038   @Override
0039   default ContinuousPartitionReader<ColumnarBatch> createColumnarReader(InputPartition partition) {
0040     throw new UnsupportedOperationException("Cannot create columnar reader.");
0041   }
0042 }