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.dataflow.worker.util.common.worker;
  
  import static org.apache.beam.runners.dataflow.worker.util.common.worker.TestOutputReceiver.TestOutputCounter.getMeanByteCounterName;
  import static org.apache.beam.runners.dataflow.worker.util.common.worker.TestOutputReceiver.TestOutputCounter.getObjectCounterName;
  import static org.junit.Assert.assertEquals;
  import static org.mockito.Mockito.verify;
  import static org.mockito.Mockito.verifyNoMoreInteractions;
  
  import java.util.Arrays;
  import java.util.List;
  import java.util.Random;
  import org.apache.beam.runners.dataflow.worker.IntrinsicMapTaskExecutorFactory.ElementByteSizeObservableCoder;
  import org.apache.beam.runners.dataflow.worker.NameContextsForTests;
  import org.apache.beam.runners.dataflow.worker.counters.Counter.CounterUpdateExtractor;
  import org.apache.beam.runners.dataflow.worker.counters.CounterFactory.CounterMean;
  import org.apache.beam.runners.dataflow.worker.counters.CounterFactory.LongCounterMean;
  import org.apache.beam.runners.dataflow.worker.counters.CounterSet;
  import org.apache.beam.runners.dataflow.worker.util.common.worker.TestOutputReceiver.TestOutputCounter;
  import org.apache.beam.sdk.coders.CoderException;
  import org.apache.beam.sdk.coders.StringUtf8Coder;
  import org.junit.Rule;
  import org.junit.Test;
  import org.junit.rules.ExpectedException;
  import org.junit.runner.RunWith;
  import org.junit.runners.JUnit4;
  import org.mockito.Mockito;
  
  /** Tests for {@link OutputObjectAndByteCounter}. */
  @RunWith(JUnit4.class)
  public class OutputObjectAndByteCounterTest {
  
    private final CounterSet counterSet = new CounterSet();
  
    @Rule public final ExpectedException thrown = ExpectedException.none();
  
    @Test
    public void testUpdate() throws Exception {
      TestOutputCounter outputCounter =
          new TestOutputCounter(NameContextsForTests.nameContextForTest());
      outputCounter.update("hi");
      outputCounter.finishLazyUpdate("hi");
      outputCounter.update("bob");
      outputCounter.finishLazyUpdate("bob");
  
      CounterMean<Long> meanByteCount = outputCounter.getMeanByteCount().getAggregate();
      assertEquals(7, (long) meanByteCount.getAggregate());
      assertEquals(2, meanByteCount.getCount());
    }
  
    @Test
    public void testIncorrectType() throws Exception {
      TestOutputCounter outputCounter =
          new TestOutputCounter(NameContextsForTests.nameContextForTest());
      thrown.expect(ClassCastException.class);
      outputCounter.update(5);
    }
  
    @Test
    public void testNullArgument() throws Exception {
      TestOutputCounter outputCounter =
          new TestOutputCounter(NameContextsForTests.nameContextForTest());
      thrown.expect(CoderException.class);
      outputCounter.update(null);
    }
  
    @Test
    public void testAddingCountersIntoCounterSet() throws Exception {
      new TestOutputCounter(counterSet, NameContextsForTests.nameContextForTest());
      CounterUpdateExtractor<?> updateExtractor = Mockito.mock(CounterUpdateExtractor.class);
      counterSet.extractUpdates(false, updateExtractor);
      verify(updateExtractor)
          .longMean(getMeanByteCounterName("output_name"), false, LongCounterMean.ZERO);
      verify(updateExtractor).longSum(getObjectCounterName("output_name"), false, 0L);
      verifyNoMoreInteractions(updateExtractor);
    }
  
    private OutputObjectAndByteCounter makeCounter(String name, int samplingPeriod, int seed) {
      OutputObjectAndByteCounter outputObjectAndByteCounter =
          new OutputObjectAndByteCounter(
              new ElementByteSizeObservableCoder<>(StringUtf8Coder.of()),
              counterSet,
              NameContextsForTests.nameContextForTest()) {
            private final Random random = new Random(seed);
  
            @Override
            protected Random getRandom() {
              return random;
            }
          };
      return outputObjectAndByteCounter.setSamplingPeriod(samplingPeriod).countBytes(name);
    }
  
    @Test
    public void testSimpleByteCount() throws Exception {
      OutputObjectAndByteCounter counter = makeCounter("byte_count", 1, 0);
      for (int i = 0; i < 10000; i++) {
        counter.update("foo");
      }
      assertEquals(40000L, (long) counter.getByteCount().getAggregate());
    }
  
    @Test
    public void testSamplingByteCountFewElements() throws Exception {
      OutputObjectAndByteCounter counter = makeCounter("byte_count", 100, 0);
      for (int i = 0; i < 10; i++) {
        counter.update("foo");
      }
      assertEquals(40L, (long) counter.getByteCount().getAggregate());
    }
  
    @Test
    public void testSamplingByteCount() throws Exception {
      List<Long> expected = Arrays.asList(4009645L, 3979997L, 4014060L);
      for (int n = 0; n < 3; n++) {
        OutputObjectAndByteCounter counter = makeCounter("byte_count_" + n, 100, n);
        for (int i = 0; i < 1000000; i++) {
          counter.update("foo");
        }
        assertEquals(expected.get(n), counter.getByteCount().getAggregate());
      }
    }
  }
  