| /* |
| * 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.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.util.SerializableUtils; |
| import org.apache.beam.sdk.util.WindowedValue; |
| import org.apache.beam.sdk.util.WindowedValue.WindowedValueCoder; |
| |
| /** ByteToWindow function. */ |
| @SuppressWarnings({ |
| "nullness" // TODO(https://issues.apache.org/jira/browse/BEAM-10402) |
| }) |
| public class ByteToElemFunction<V> implements MapFunc<WindowedValue<V>, byte[]> { |
| private transient WindowedValueCoder<V> wvCoder; |
| private static final Logger LOG = Logger.getLogger(ByteToElemFunction.class.getName()); |
| |
| private transient boolean isInitialized = false; |
| private byte[] wvCoderBytes; |
| |
| public ByteToElemFunction() { |
| // non arg constructor needed for kryo |
| isInitialized = false; |
| } |
| |
| public ByteToElemFunction(final WindowedValueCoder<V> wvCoder) { |
| this.wvCoder = wvCoder; |
| |
| wvCoderBytes = SerializableUtils.serializeToByteArray(wvCoder); |
| } |
| |
| @Override |
| public WindowedValue<V> map(byte[] input) { |
| return TranslationUtils.fromByteArray(input, wvCoder); |
| } |
| |
| @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; |
| } |
| |
| wvCoder = |
| (WindowedValueCoder<V>) |
| SerializableUtils.deserializeFromByteArray(wvCoderBytes, "Custom Coder Bytes"); |
| this.isInitialized = true; |
| } |
| |
| protected Object readResolve() throws ObjectStreamException { |
| return this; |
| } |
| } |