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.beam.sdk.fn;
  
  import static org.hamcrest.MatcherAssert.assertThat;
  import static org.hamcrest.Matchers.hasItem;
  import static org.hamcrest.core.StringContains.containsString;
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertTrue;
  
  import com.google.auto.service.AutoService;
  import java.io.ByteArrayInputStream;
  import java.io.ByteArrayOutputStream;
  import java.io.IOException;
  import java.io.PrintStream;
  import java.io.UnsupportedEncodingException;
  import java.util.Scanner;
  import org.apache.beam.sdk.harness.JvmInitializer;
  import org.apache.beam.sdk.options.PipelineOptions;
  import org.apache.beam.sdk.testing.ExpectedLogs;
  import org.apache.beam.sdk.testing.TestPipeline;
  import org.junit.Before;
  import org.junit.Rule;
  import org.junit.Test;
  import org.junit.runner.RunWith;
  import org.junit.runners.JUnit4;
  
  /** Tests for {@link JvmInitializers}. */
  @RunWith(JUnit4.class)
  public final class JvmInitializersTest {
  
    @Rule public ExpectedLogs expectedLogs = ExpectedLogs.none(JvmInitializers.class);
  
    private static Boolean onStartupRan;
    private static Boolean beforeProcessingRan;
    private static PipelineOptions receivedOptions;
  
    /** Test initializer implementation. Methods simply produce observable side effects. */
    @AutoService(JvmInitializer.class)
    public static class TestInitializer implements JvmInitializer {
      @Override
      public void onStartup() {
        onStartupRan = true;
      }
  
      @Override
      public void beforeProcessing(PipelineOptions options) {
        beforeProcessingRan = true;
        receivedOptions = options;
      }
    }
  
    @Before
    public void setUp() {
      onStartupRan = false;
      beforeProcessingRan = false;
      receivedOptions = null;
    }
  
    @Test
    public void runOnStartup_runsInitializers() throws IOException, UnsupportedEncodingException {
      ByteArrayOutputStream baos = new ByteArrayOutputStream();
  
      PrintStream out = System.out;
      try (PrintStream ps = new PrintStream(baos, false, "UTF8")) {
        System.setOut(ps);
        JvmInitializers.runOnStartup();
      } finally {
        System.setOut(out);
      }
  
      assertTrue(onStartupRan);
      assertThat(
          () ->
              new Scanner(new ByteArrayInputStream(baos.toByteArray()), "UTF8")
                  .useDelimiter(System.lineSeparator()),
          hasItem(containsString("Running JvmInitializer#onStartup")));
    }
  
    @Test
    public void runBeforeProcessing_runsInitializersWithOptions() {
      PipelineOptions options = TestPipeline.testingPipelineOptions();
  
      JvmInitializers.runBeforeProcessing(options);
  
      assertTrue(beforeProcessingRan);
      assertEquals(options, receivedOptions);
      expectedLogs.verifyInfo("Running JvmInitializer#beforeProcessing");
    }
  }
  