content: /*
   * 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.kafka.connect.file;
  
  import org.apache.kafka.clients.consumer.OffsetAndMetadata;
  import org.apache.kafka.common.TopicPartition;
  import org.apache.kafka.connect.data.Schema;
  import org.apache.kafka.connect.sink.SinkRecord;
  
  import org.junit.jupiter.api.BeforeEach;
  import org.junit.jupiter.api.Test;
  import org.junit.jupiter.api.io.TempDir;
  
  import java.io.BufferedReader;
  import java.io.ByteArrayOutputStream;
  import java.io.IOException;
  import java.io.PrintStream;
  import java.nio.file.Files;
  import java.nio.file.Path;
  import java.nio.file.Paths;
  import java.util.Arrays;
  import java.util.Collections;
  import java.util.HashMap;
  import java.util.Map;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  
  public class FileStreamSinkTaskTest {
  
      private FileStreamSinkTask task;
      private ByteArrayOutputStream os;
  
      @TempDir
      public Path topDir;
      private String outputFile;
  
      @BeforeEach
      public void setup() {
          os = new ByteArrayOutputStream();
          PrintStream printStream = new PrintStream(os);
          task = new FileStreamSinkTask(printStream);
          outputFile = topDir.resolve("connect.output").toAbsolutePath().toString();
      }
  
      @Test
      public void testPutFlush() {
          HashMap<TopicPartition, OffsetAndMetadata> offsets = new HashMap<>();
          final String newLine = System.lineSeparator();
  
          // We do not call task.start() since it would override the output stream
  
          task.put(Collections.singletonList(
                  new SinkRecord("topic1", 0, null, null, Schema.STRING_SCHEMA, "line1", 1)
          ));
          offsets.put(new TopicPartition("topic1", 0), new OffsetAndMetadata(1L));
          task.flush(offsets);
          assertEquals("line1" + newLine, os.toString());
  
          task.put(Arrays.asList(
                  new SinkRecord("topic1", 0, null, null, Schema.STRING_SCHEMA, "line2", 2),
                  new SinkRecord("topic2", 0, null, null, Schema.STRING_SCHEMA, "line3", 1)
          ));
          offsets.put(new TopicPartition("topic1", 0), new OffsetAndMetadata(2L));
          offsets.put(new TopicPartition("topic2", 0), new OffsetAndMetadata(1L));
          task.flush(offsets);
          assertEquals("line1" + newLine + "line2" + newLine + "line3" + newLine, os.toString());
      }
  
      @Test
      public void testStart() throws IOException {
          task = new FileStreamSinkTask();
          Map<String, String> props = new HashMap<>();
          props.put(FileStreamSinkConnector.FILE_CONFIG, outputFile);
          task.start(props);
  
          HashMap<TopicPartition, OffsetAndMetadata> offsets = new HashMap<>();
          task.put(Collections.singletonList(
                  new SinkRecord("topic1", 0, null, null, Schema.STRING_SCHEMA, "line0", 1)
          ));
          offsets.put(new TopicPartition("topic1", 0), new OffsetAndMetadata(1L));
          task.flush(offsets);
  
          int numLines = 3;
          String[] lines = new String[numLines];
          int i = 0;
          try (BufferedReader reader = Files.newBufferedReader(Paths.get(outputFile))) {
              lines[i++] = reader.readLine();
              task.put(Arrays.asList(
                      new SinkRecord("topic1", 0, null, null, Schema.STRING_SCHEMA, "line1", 2),
                      new SinkRecord("topic2", 0, null, null, Schema.STRING_SCHEMA, "line2", 1)
              ));
              offsets.put(new TopicPartition("topic1", 0), new OffsetAndMetadata(2L));
              offsets.put(new TopicPartition("topic2", 0), new OffsetAndMetadata(1L));
              task.flush(offsets);
              lines[i++] = reader.readLine();
              lines[i++] = reader.readLine();
          }
  
          while (--i >= 0) {
              assertEquals("line" + i, lines[i]);
          }
      }
  }
  