| /* |
| * 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.nio.ByteBuffer; |
| import org.apache.beam.sdk.coders.Coder; |
| import org.apache.beam.sdk.util.WindowedValue; |
| import org.apache.beam.sdk.values.KV; |
| import org.apache.flink.api.common.typeinfo.TypeInformation; |
| import org.apache.flink.api.java.functions.KeySelector; |
| import org.apache.flink.api.java.typeutils.GenericTypeInfo; |
| import org.apache.flink.api.java.typeutils.ResultTypeQueryable; |
| |
| /** |
| * {@link KeySelector} that retrieves a key from a {@link KV}. This will return the key as encoded |
| * by the provided {@link Coder} in a {@link ByteBuffer}. This ensures that all key |
| * comparisons/hashing happen on the encoded form. |
| */ |
| public class KvToByteBufferKeySelector<K, V> |
| implements KeySelector<WindowedValue<KV<K, V>>, ByteBuffer>, ResultTypeQueryable<ByteBuffer> { |
| |
| private final Coder<K> keyCoder; |
| |
| public KvToByteBufferKeySelector(Coder<K> keyCoder) { |
| this.keyCoder = keyCoder; |
| } |
| |
| @Override |
| public ByteBuffer getKey(WindowedValue<KV<K, V>> value) throws Exception { |
| K key = value.getValue().getKey(); |
| return FlinkKeyUtils.encodeKey(key, keyCoder); |
| } |
| |
| @Override |
| public TypeInformation<ByteBuffer> getProducedType() { |
| return new GenericTypeInfo<>(ByteBuffer.class); |
| } |
| } |