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   * 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.streaming;
  
  import com.google.api.services.bigquery.model.TableRow;
  import java.io.File;
  import java.io.Serializable;
  import java.util.Arrays;
  import org.apache.beam.runners.flink.FlinkTestPipeline;
  import org.apache.beam.sdk.Pipeline;
  import org.apache.beam.sdk.io.TextIO;
  import org.apache.beam.sdk.transforms.Count;
  import org.apache.beam.sdk.transforms.Create;
  import org.apache.beam.sdk.transforms.DoFn;
  import org.apache.beam.sdk.transforms.ParDo;
  import org.apache.beam.sdk.transforms.windowing.Sessions;
  import org.apache.beam.sdk.transforms.windowing.Window;
  import org.apache.beam.sdk.values.KV;
  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.AbstractTestBase;
  import org.apache.flink.test.util.TestBaseUtils;
  import org.joda.time.Duration;
  import org.joda.time.Instant;
  import org.junit.After;
  import org.junit.Before;
  import org.junit.Test;
  
  /** Session window test. */
  public class TopWikipediaSessionsTest extends AbstractTestBase implements Serializable {
  
    protected String resultDir;
    protected String resultPath;
  
    public TopWikipediaSessionsTest() {}
  
    static final String[] EXPECTED_RESULT =
        new String[] {
          "user: user1 value:3",
          "user: user1 value:1",
          "user: user2 value:4",
          "user: user2 value:6",
          "user: user3 value:7",
          "user: user3 value:2"
        };
  
    @Before
    public void preSubmit() throws Exception {
      // Beam Write will add shard suffix to fileName, see ShardNameTemplate.
      // So tempFile need have a parent to compare.
      File resultParent = createAndRegisterTempFile("result");
      resultDir = resultParent.toURI().toString();
      resultPath = new File(resultParent, "file.txt").getAbsolutePath();
    }
  
    @After
    public void postSubmit() throws Exception {
      TestBaseUtils.compareResultsByLinesInMemory(Joiner.on('\n').join(EXPECTED_RESULT), resultDir);
    }
  
    @Test
    public void testProgram() throws Exception {
  
      Pipeline p = FlinkTestPipeline.createForStreaming();
  
      Long now = (System.currentTimeMillis() + 10000) / 1000;
  
      PCollection<KV<String, Long>> output =
          p.apply(
                  Create.of(
                      Arrays.asList(
                          new TableRow().set("timestamp", now).set("contributor_username", "user1"),
                          new TableRow()
                              .set("timestamp", now + 10)
                              .set("contributor_username", "user3"),
                          new TableRow().set("timestamp", now).set("contributor_username", "user2"),
                          new TableRow().set("timestamp", now).set("contributor_username", "user1"),
                          new TableRow()
                              .set("timestamp", now + 2)
                              .set("contributor_username", "user1"),
                          new TableRow().set("timestamp", now).set("contributor_username", "user2"),
                          new TableRow()
                              .set("timestamp", now + 1)
                              .set("contributor_username", "user2"),
                          new TableRow()
                              .set("timestamp", now + 5)
                              .set("contributor_username", "user2"),
                          new TableRow()
                              .set("timestamp", now + 7)
                              .set("contributor_username", "user2"),
                          new TableRow()
                              .set("timestamp", now + 8)
                              .set("contributor_username", "user2"),
                          new TableRow()
                              .set("timestamp", now + 200)
                              .set("contributor_username", "user2"),
                          new TableRow()
                              .set("timestamp", now + 230)
                              .set("contributor_username", "user1"),
                          new TableRow()
                              .set("timestamp", now + 230)
                              .set("contributor_username", "user2"),
                          new TableRow()
                              .set("timestamp", now + 240)
                              .set("contributor_username", "user2"),
                          new TableRow()
                              .set("timestamp", now + 245)
                              .set("contributor_username", "user3"),
                          new TableRow()
                              .set("timestamp", now + 235)
                              .set("contributor_username", "user3"),
                          new TableRow()
                              .set("timestamp", now + 236)
                              .set("contributor_username", "user3"),
                          new TableRow()
                              .set("timestamp", now + 237)
                              .set("contributor_username", "user3"),
                          new TableRow()
                              .set("timestamp", now + 238)
                              .set("contributor_username", "user3"),
                          new TableRow()
                              .set("timestamp", now + 239)
                              .set("contributor_username", "user3"),
                          new TableRow()
                              .set("timestamp", now + 240)
                              .set("contributor_username", "user3"),
                          new TableRow()
                              .set("timestamp", now + 241)
                              .set("contributor_username", "user2"),
                          new TableRow().set("timestamp", now).set("contributor_username", "user3"))))
              .apply(
                  ParDo.of(
                      new DoFn<TableRow, String>() {
                        @ProcessElement
                        public void processElement(ProcessContext c) throws Exception {
                          TableRow row = c.element();
                          long timestamp = (Integer) row.get("timestamp");
                          String userName = (String) row.get("contributor_username");
                          if (userName != null) {
                            // Sets the timestamp field to be used in windowing.
                            c.outputWithTimestamp(userName, new Instant(timestamp * 1000L));
                          }
                        }
                      }))
              .apply(Window.into(Sessions.withGapDuration(Duration.standardMinutes(1))))
              .apply(Count.perElement());
  
      PCollection<String> format =
          output.apply(
              ParDo.of(
                  new DoFn<KV<String, Long>, String>() {
                    @ProcessElement
                    public void processElement(ProcessContext c) throws Exception {
                      KV<String, Long> el = c.element();
                      String out = "user: " + el.getKey() + " value:" + el.getValue();
                      c.output(out);
                    }
                  }));
  
      format.apply(TextIO.write().to(resultPath));
  
      p.run();
    }
  }
  