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.runners.flink;
  
  import java.io.File;
  import java.net.URI;
  import org.apache.beam.sdk.Pipeline;
  import org.apache.beam.sdk.io.GenerateSequence;
  import org.apache.beam.sdk.io.TextIO;
  import org.apache.beam.sdk.transforms.DoFn;
  import org.apache.beam.sdk.transforms.ParDo;
  import org.apache.beam.sdk.values.PCollection;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.base.Joiner;
  import org.apache.flink.test.util.JavaProgramTestBase;
  import org.apache.flink.test.util.TestBaseUtils;
  
  /** Reads from a bounded source in batch execution. */
  public class ReadSourceTest extends JavaProgramTestBase {
  
    protected String resultPath;
  
    public ReadSourceTest() {}
  
    private static final String[] EXPECTED_RESULT =
        new String[] {"0", "1", "2", "3", "4", "5", "6", "7", "8", "9"};
  
    @Override
    protected void preSubmit() throws Exception {
      resultPath = getTempDirPath("result");
  
      // need to create the dir, otherwise Beam sinks don't
      // work for these tests
  
      if (!new File(new URI(resultPath)).mkdirs()) {
        throw new RuntimeException("Could not create output dir.");
      }
    }
  
    @Override
    protected void postSubmit() throws Exception {
      TestBaseUtils.compareResultsByLinesInMemory(Joiner.on('\n').join(EXPECTED_RESULT), resultPath);
    }
  
    @Override
    protected void testProgram() throws Exception {
      runProgram(resultPath);
    }
  
    private static void runProgram(String resultPath) throws Exception {
  
      Pipeline p = FlinkTestPipeline.createForBatch();
  
      PCollection<String> result =
          p.apply(GenerateSequence.from(0).to(10))
              .apply(
                  ParDo.of(
                      new DoFn<Long, String>() {
                        @ProcessElement
                        public void processElement(ProcessContext c) throws Exception {
                          c.output(c.element().toString());
                        }
                      }));
  
      result.apply(TextIO.write().to(new URI(resultPath).getPath() + "/part"));
  
      p.run();
    }
  }
  