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.streams.kstream;
  
  import org.apache.kafka.streams.errors.TopologyException;
  import org.apache.kafka.streams.kstream.internals.PrintedInternal;
  import org.apache.kafka.streams.processor.api.Processor;
  import org.apache.kafka.streams.processor.api.ProcessorSupplier;
  import org.apache.kafka.streams.processor.api.Record;
  import org.apache.kafka.test.TestUtils;
  
  import org.junit.jupiter.api.AfterEach;
  import org.junit.jupiter.api.BeforeEach;
  import org.junit.jupiter.api.Test;
  
  import java.io.ByteArrayOutputStream;
  import java.io.File;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.PrintStream;
  import java.nio.charset.StandardCharsets;
  import java.nio.file.Files;
  
  import static org.hamcrest.CoreMatchers.equalTo;
  import static org.hamcrest.MatcherAssert.assertThat;
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertThrows;
  
  public class PrintedTest {
  
      private final PrintStream originalSysOut = System.out;
      private final ByteArrayOutputStream sysOut = new ByteArrayOutputStream();
      private Printed<String, Integer> sysOutPrinter;
  
      @BeforeEach
      public void before() {
          System.setOut(new PrintStream(sysOut));
          sysOutPrinter = Printed.toSysOut();
      }
  
      @AfterEach
      public void after() {
          System.setOut(originalSysOut);
      }
  
      @Test
      public void shouldCreateProcessorThatPrintsToFile() throws IOException {
          final File file = TestUtils.tempFile();
          final ProcessorSupplier<String, Integer, Void, Void> processorSupplier = new PrintedInternal<>(
                  Printed.<String, Integer>toFile(file.getPath()))
                  .build("processor");
          final Processor<String, Integer, Void, Void> processor = processorSupplier.get();
          processor.process(new Record<>("hi", 1, 0L));
          processor.close();
          try (final InputStream stream = Files.newInputStream(file.toPath())) {
              final byte[] data = new byte[stream.available()];
              stream.read(data);
              assertThat(new String(data, StandardCharsets.UTF_8), equalTo("[processor]: hi, 1\n"));
          }
      }
  
      @Test
      public void shouldCreateProcessorThatPrintsToStdOut() {
          final ProcessorSupplier<String, Integer, Void, Void> supplier = new PrintedInternal<>(sysOutPrinter).build("processor");
          final Processor<String, Integer, Void, Void> processor = supplier.get();
  
          processor.process(new Record<>("good", 2, 0L));
          processor.close();
          assertEquals(sysOut.toString(StandardCharsets.UTF_8), "[processor]: good, 2\n");
      }
  
      @Test
      public void shouldPrintWithLabel() {
          final Processor<String, Integer, Void, Void> processor = new PrintedInternal<>(sysOutPrinter.withLabel("label"))
                  .build("processor")
                  .get();
  
          processor.process(new Record<>("hello", 3, 0L));
          processor.close();
          assertEquals(sysOut.toString(StandardCharsets.UTF_8), "[label]: hello, 3\n");
      }
  
      @Test
      public void shouldPrintWithKeyValueMapper() {
          final Processor<String, Integer, Void, Void> processor = new PrintedInternal<>(
              sysOutPrinter.withKeyValueMapper((key, value) -> String.format("%s -> %d", key, value))
          ).build("processor").get();
          processor.process(new Record<>("hello", 1, 0L));
          processor.close();
          assertEquals(sysOut.toString(StandardCharsets.UTF_8), "[processor]: hello -> 1\n");
      }
  
      @Test
      public void shouldThrowNullPointerExceptionIfFilePathIsNull() {
          assertThrows(NullPointerException.class, () -> Printed.toFile(null));
      }
  
      @Test
      public void shouldThrowNullPointerExceptionIfMapperIsNull() {
          assertThrows(NullPointerException.class, () -> sysOutPrinter.withKeyValueMapper(null));
      }
  
      @Test
      public void shouldThrowNullPointerExceptionIfLabelIsNull() {
          assertThrows(NullPointerException.class, () -> sysOutPrinter.withLabel(null));
      }
  
      @Test
      public void shouldThrowTopologyExceptionIfFilePathIsEmpty() {
          assertThrows(TopologyException.class, () -> Printed.toFile(""));
      }
  
      @Test
      public void shouldThrowTopologyExceptionIfFilePathDoesntExist() {
          assertThrows(TopologyException.class, () -> Printed.toFile("/this/should/not/exist"));
      }
  }
  