sql/streaming/JavaDataStreamReaderWriterSuite.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 test.org.apache.spark.sql.streaming;
0019
0020 import java.io.File;
0021 import java.util.concurrent.TimeoutException;
0022
0023 import org.junit.After;
0024 import org.junit.Before;
0025 import org.junit.Test;
0026
0027 import org.apache.spark.api.java.function.VoidFunction2;
0028 import org.apache.spark.sql.Dataset;
0029 import org.apache.spark.sql.ForeachWriter;
0030 import org.apache.spark.sql.SparkSession;
0031 import org.apache.spark.sql.streaming.StreamingQuery;
0032 import org.apache.spark.sql.test.TestSparkSession;
0033 import org.apache.spark.util.Utils;
0034
0035 public class JavaDataStreamReaderWriterSuite {
0036   private SparkSession spark;
0037   private String input;
0038
0039   @Before
0040   public void setUp() {
0041     spark = new TestSparkSession();
0042     input = Utils.createTempDir(System.getProperty("java.io.tmpdir"), "input").toString();
0043   }
0044
0045   @After
0046   public void tearDown() {
0047     try {
0048       Utils.deleteRecursively(new File(input));
0049     } finally {
0050       spark.stop();
0051       spark = null;
0052     }
0053   }
0054
0055   @Test
0056   public void testForeachBatchAPI() throws TimeoutException {
0057     StreamingQuery query = spark
0058       .readStream()
0059       .textFile(input)
0060       .writeStream()
0061       .foreachBatch(new VoidFunction2<Dataset<String>, Long>() {
0062         @Override
0063         public void call(Dataset<String> v1, Long v2) throws Exception {}
0064       })
0065       .start();
0066     query.stop();
0067   }
0068
0069   @Test
0070   public void testForeachAPI() throws TimeoutException {
0071     StreamingQuery query = spark
0072       .readStream()
0073       .textFile(input)
0074       .writeStream()
0075       .foreach(new ForeachWriter<String>() {
0076         @Override
0077         public boolean open(long partitionId, long epochId) {
0078           return true;
0079         }
0080
0081         @Override
0082         public void process(String value) {}
0083
0084         @Override
0085         public void close(Throwable errorOrNull) {}
0086       })
0087       .start();
0088     query.stop();
0089   }
0090 }