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   * Licensed to the Apache Software Foundation (ASF) under one
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   * 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
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  package org.apache.beam.runners.spark.translation;
  
  import static org.junit.Assert.assertEquals;
  
  import com.esotericsoftware.kryo.Kryo;
  import com.esotericsoftware.kryo.io.Input;
  import com.esotericsoftware.kryo.io.Output;
  import java.io.ByteArrayInputStream;
  import java.io.ByteArrayOutputStream;
  import java.io.IOException;
  import java.io.ObjectInputStream;
  import java.io.ObjectOutputStream;
  import java.util.Arrays;
  import org.apache.beam.sdk.coders.BigEndianIntegerCoder;
  import org.apache.beam.sdk.coders.IterableCoder;
  import org.apache.beam.sdk.transforms.windowing.GlobalWindow;
  import org.apache.beam.sdk.transforms.windowing.PaneInfo;
  import org.apache.beam.sdk.values.WindowedValue;
  import org.apache.beam.sdk.values.WindowedValues;
  import org.joda.time.Instant;
  import org.junit.Test;
  
  /** Unit tests of {@link ValueAndCoderLazySerializable}. */
  @SuppressWarnings({
    "rawtypes" // TODO(https://github.com/apache/beam/issues/20447)
  })
  public class ValueAndCoderLazySerializableTest {
  
    @Test
    public void serializableAccumulatorSerializationTest()
        throws IOException, ClassNotFoundException {
      Iterable<WindowedValue<Integer>> accumulatedValue =
          Arrays.asList(winVal(0), winVal(1), winVal(3), winVal(4));
  
      final WindowedValues.FullWindowedValueCoder<Integer> wvaCoder =
          WindowedValues.FullWindowedValueCoder.of(
              BigEndianIntegerCoder.of(), GlobalWindow.Coder.INSTANCE);
  
      final IterableCoder<WindowedValue<Integer>> iterAccumCoder = IterableCoder.of(wvaCoder);
  
      ValueAndCoderLazySerializable<Iterable<WindowedValue<Integer>>> accUnderTest =
          ValueAndCoderLazySerializable.of(accumulatedValue, iterAccumCoder);
  
      ByteArrayOutputStream inMemOut = new ByteArrayOutputStream();
      ObjectOutputStream oos = new ObjectOutputStream(inMemOut);
      oos.writeObject(accUnderTest);
  
      ObjectInputStream ois = new ObjectInputStream(new ByteArrayInputStream(inMemOut.toByteArray()));
  
      @SuppressWarnings("unchecked")
      ValueAndCoderLazySerializable<Iterable<WindowedValue<Integer>>> materialized =
          (ValueAndCoderLazySerializable<Iterable<WindowedValue<Integer>>>) ois.readObject();
      assertEquals(accumulatedValue, materialized.getOrDecode(iterAccumCoder));
    }
  
    @Test
    public void serializableAccumulatorKryoTest() {
      Iterable<WindowedValue<Integer>> accumulatedValue =
          Arrays.asList(winVal(0), winVal(1), winVal(3), winVal(4));
  
      final WindowedValues.FullWindowedValueCoder<Integer> wvaCoder =
          WindowedValues.FullWindowedValueCoder.of(
              BigEndianIntegerCoder.of(), GlobalWindow.Coder.INSTANCE);
  
      final IterableCoder<WindowedValue<Integer>> iterAccumCoder = IterableCoder.of(wvaCoder);
  
      ValueAndCoderLazySerializable<Iterable<WindowedValue<Integer>>> accUnderTest =
          ValueAndCoderLazySerializable.of(accumulatedValue, iterAccumCoder);
  
      ValueAndCoderKryoSerializer kryoSerializer = new ValueAndCoderKryoSerializer();
      Kryo kryo = new Kryo();
      kryo.register(ValueAndCoderLazySerializable.class, kryoSerializer);
  
      ByteArrayOutputStream inMemOut = new ByteArrayOutputStream();
      Output out = new Output(inMemOut);
      kryo.writeObject(out, accUnderTest);
      out.close();
  
      Input input = new Input(new ByteArrayInputStream(inMemOut.toByteArray()));
  
      @SuppressWarnings("unchecked")
      ValueAndCoderLazySerializable<Iterable<WindowedValue<Integer>>> materialized =
          (ValueAndCoderLazySerializable<Iterable<WindowedValue<Integer>>>)
              kryo.readObject(input, ValueAndCoderLazySerializable.class);
      input.close();
  
      assertEquals(accumulatedValue, materialized.getOrDecode(iterAccumCoder));
    }
  
    private <T> WindowedValue<T> winVal(T val) {
      return WindowedValues.of(val, Instant.now(), GlobalWindow.INSTANCE, PaneInfo.NO_FIRING);
    }
  }
  