| /* |
| * 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.translation.wrappers.streaming; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.OutputStream; |
| import java.util.List; |
| import org.apache.beam.runners.core.KeyedWorkItem; |
| import org.apache.beam.runners.core.KeyedWorkItemCoder; |
| import org.apache.beam.sdk.coders.Coder; |
| import org.apache.beam.sdk.coders.CoderException; |
| import org.apache.beam.sdk.coders.StructuredCoder; |
| import org.apache.beam.sdk.transforms.windowing.BoundedWindow; |
| import org.apache.beam.sdk.util.WindowedValue; |
| import org.apache.beam.vendor.guava.v20_0.com.google.common.collect.ImmutableList; |
| |
| /** Singleton keyed work item coder. */ |
| public class SingletonKeyedWorkItemCoder<K, ElemT> |
| extends StructuredCoder<SingletonKeyedWorkItem<K, ElemT>> { |
| /** |
| * Create a new {@link KeyedWorkItemCoder} with the provided key coder, element coder, and window |
| * coder. |
| */ |
| public static <K, ElemT> SingletonKeyedWorkItemCoder<K, ElemT> of( |
| Coder<K> keyCoder, Coder<ElemT> elemCoder, Coder<? extends BoundedWindow> windowCoder) { |
| return new SingletonKeyedWorkItemCoder<>(keyCoder, elemCoder, windowCoder); |
| } |
| |
| private final Coder<K> keyCoder; |
| private final Coder<ElemT> elemCoder; |
| private final Coder<? extends BoundedWindow> windowCoder; |
| private final WindowedValue.FullWindowedValueCoder<ElemT> valueCoder; |
| |
| private SingletonKeyedWorkItemCoder( |
| Coder<K> keyCoder, Coder<ElemT> elemCoder, Coder<? extends BoundedWindow> windowCoder) { |
| this.keyCoder = keyCoder; |
| this.elemCoder = elemCoder; |
| this.windowCoder = windowCoder; |
| valueCoder = WindowedValue.FullWindowedValueCoder.of(elemCoder, windowCoder); |
| } |
| |
| public Coder<K> getKeyCoder() { |
| return keyCoder; |
| } |
| |
| public Coder<ElemT> getElementCoder() { |
| return elemCoder; |
| } |
| |
| @Override |
| public void encode(SingletonKeyedWorkItem<K, ElemT> value, OutputStream outStream) |
| throws CoderException, IOException { |
| encode(value, outStream, Context.NESTED); |
| } |
| |
| @Override |
| public void encode( |
| SingletonKeyedWorkItem<K, ElemT> value, OutputStream outStream, Context context) |
| throws CoderException, IOException { |
| keyCoder.encode(value.key(), outStream); |
| valueCoder.encode(value.value(), outStream, context); |
| } |
| |
| @Override |
| public SingletonKeyedWorkItem<K, ElemT> decode(InputStream inStream) |
| throws CoderException, IOException { |
| return decode(inStream, Context.NESTED); |
| } |
| |
| @Override |
| public SingletonKeyedWorkItem<K, ElemT> decode(InputStream inStream, Context context) |
| throws CoderException, IOException { |
| K key = keyCoder.decode(inStream); |
| WindowedValue<ElemT> value = valueCoder.decode(inStream, context); |
| return new SingletonKeyedWorkItem<>(key, value); |
| } |
| |
| @Override |
| public List<? extends Coder<?>> getCoderArguments() { |
| return ImmutableList.of(keyCoder, elemCoder, windowCoder); |
| } |
| |
| @Override |
| public void verifyDeterministic() throws NonDeterministicException { |
| keyCoder.verifyDeterministic(); |
| elemCoder.verifyDeterministic(); |
| windowCoder.verifyDeterministic(); |
| } |
| |
| /** |
| * {@inheritDoc}. |
| * |
| * <p>{@link KeyedWorkItemCoder} is not consistent with equals as it can return a {@link |
| * KeyedWorkItem} of a type different from the originally encoded type. |
| */ |
| @Override |
| public boolean consistentWithEquals() { |
| return false; |
| } |
| } |