| /* |
| * 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.sdk.coders; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.OutputStream; |
| import java.util.Arrays; |
| import java.util.List; |
| import org.apache.beam.sdk.values.ShardedKey; |
| import org.apache.beam.vendor.guava.v26_0_jre.com.google.common.annotations.VisibleForTesting; |
| |
| /** A {@link Coder} for {@link ShardedKey}, using a wrapped key {@link Coder}. */ |
| @VisibleForTesting |
| public class ShardedKeyCoder<KeyT> extends StructuredCoder<ShardedKey<KeyT>> { |
| public static <KeyT> ShardedKeyCoder<KeyT> of(Coder<KeyT> keyCoder) { |
| return new ShardedKeyCoder<>(keyCoder); |
| } |
| |
| private final Coder<KeyT> keyCoder; |
| private final VarIntCoder shardNumberCoder; |
| |
| protected ShardedKeyCoder(Coder<KeyT> keyCoder) { |
| this.keyCoder = keyCoder; |
| this.shardNumberCoder = VarIntCoder.of(); |
| } |
| |
| @Override |
| public List<? extends Coder<?>> getCoderArguments() { |
| return Arrays.asList(keyCoder); |
| } |
| |
| @Override |
| public void encode(ShardedKey<KeyT> key, OutputStream outStream) throws IOException { |
| keyCoder.encode(key.getKey(), outStream); |
| shardNumberCoder.encode(key.getShardNumber(), outStream); |
| } |
| |
| @Override |
| public ShardedKey<KeyT> decode(InputStream inStream) throws IOException { |
| return ShardedKey.of(keyCoder.decode(inStream), shardNumberCoder.decode(inStream)); |
| } |
| |
| @Override |
| public void verifyDeterministic() throws NonDeterministicException { |
| keyCoder.verifyDeterministic(); |
| } |
| } |