runners/twister2/src/main/java/org/apache/beam/runners/twister2/translators/functions/ByteToWindowFunctionPrimitive.java

/*
 * 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.twister2.translators.functions;

import edu.iu.dsc.tws.api.comms.structs.Tuple;
import edu.iu.dsc.tws.api.tset.TSetContext;
import edu.iu.dsc.tws.api.tset.fn.MapFunc;
import java.io.ObjectStreamException;
import java.util.logging.Logger;
import org.apache.beam.runners.twister2.utils.TranslationUtils;
import org.apache.beam.sdk.coders.Coder;
import org.apache.beam.sdk.coders.CoderException;
import org.apache.beam.sdk.util.CoderUtils;
import org.apache.beam.sdk.util.SerializableUtils;
import org.apache.beam.sdk.util.WindowedValue;
import org.apache.beam.sdk.util.WindowedValue.WindowedValueCoder;
import org.apache.beam.sdk.values.KV;

/** ByteToWindow function. */
@SuppressWarnings({
  "nullness" // TODO(https://issues.apache.org/jira/browse/BEAM-10402)
})
public class ByteToWindowFunctionPrimitive<K, V>
    implements MapFunc<WindowedValue<KV<K, V>>, Tuple<byte[], byte[]>> {
  private transient Coder<K> keyCoder;
  private transient WindowedValueCoder<V> wvCoder;
  private static final Logger LOG = Logger.getLogger(ByteToWindowFunctionPrimitive.class.getName());

  private transient boolean isInitialized = false;
  private byte[] keyCoderBytes;
  private byte[] wvCoderBytes;

  public ByteToWindowFunctionPrimitive() {
    // non arg constructor needed for kryo
    isInitialized = false;
  }

  public ByteToWindowFunctionPrimitive(
      final Coder<K> inputKeyCoder, final WindowedValueCoder<V> wvCoder) {
    this.keyCoder = inputKeyCoder;
    this.wvCoder = wvCoder;

    keyCoderBytes = SerializableUtils.serializeToByteArray(keyCoder);
    wvCoderBytes = SerializableUtils.serializeToByteArray(wvCoder);
  }

  @Override
  public WindowedValue<KV<K, V>> map(Tuple<byte[], byte[]> input) {
    K key = null;
    WindowedValue<V> value = null;
    try {
      key = CoderUtils.decodeFromByteArray(keyCoder, input.getKey());

      value = TranslationUtils.fromByteArray(input.getValue(), wvCoder);
    } catch (CoderException e) {
      LOG.info(e.getMessage());
    }
    WindowedValue<KV<K, V>> element;

    if (value == null) {
      value = WindowedValue.valueInGlobalWindow(null);
    }
    element =
        WindowedValue.of(
            KV.of(key, value.getValue()),
            value.getTimestamp(),
            value.getWindows(),
            value.getPane());

    return element;
  }

  @Override
  public void prepare(TSetContext context) {
    initTransient();
  }

  /**
   * Method used to initialize the transient variables that were sent over as byte arrays or proto
   * buffers.
   */
  private void initTransient() {
    if (isInitialized) {
      return;
    }

    keyCoder =
        (Coder<K>) SerializableUtils.deserializeFromByteArray(keyCoderBytes, "Custom Coder Bytes");
    wvCoder =
        (WindowedValueCoder<V>)
            SerializableUtils.deserializeFromByteArray(wvCoderBytes, "Custom Coder Bytes");
    this.isInitialized = true;
  }

  protected Object readResolve() throws ObjectStreamException {
    return this;
  }
}