| /* |
| * 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.nexmark.model.sql; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.OutputStream; |
| import org.apache.beam.sdk.coders.Coder; |
| import org.apache.beam.sdk.coders.CustomCoder; |
| import org.apache.beam.sdk.coders.RowCoder; |
| import org.apache.beam.sdk.coders.VarLongCoder; |
| import org.apache.beam.sdk.nexmark.model.KnownSize; |
| import org.apache.beam.sdk.transforms.DoFn; |
| import org.apache.beam.sdk.transforms.ParDo; |
| import org.apache.beam.sdk.values.Row; |
| |
| /** |
| * {@link KnownSize} implementation to estimate the size of a {@link Row}, similar to Java model. |
| * NexmarkLauncher/Queries infrastructure expects the events to be able to quickly provide the |
| * estimates of their sizes. |
| * |
| * <p>The {@link Row} size is calculated at creation time. |
| */ |
| public class RowSize implements KnownSize { |
| private static final Coder<Long> LONG_CODER = VarLongCoder.of(); |
| public static final Coder<RowSize> CODER = |
| new CustomCoder<RowSize>() { |
| @Override |
| public void encode(RowSize rowSize, OutputStream outStream) throws IOException { |
| |
| LONG_CODER.encode(rowSize.sizeInBytes(), outStream); |
| } |
| |
| @Override |
| public RowSize decode(InputStream inStream) throws IOException { |
| return new RowSize(LONG_CODER.decode(inStream)); |
| } |
| }; |
| |
| public static ParDo.SingleOutput<Row, RowSize> parDo() { |
| return ParDo.of( |
| new DoFn<Row, RowSize>() { |
| @ProcessElement |
| public void processElement(ProcessContext c) { |
| c.output(RowSize.of(c.element())); |
| } |
| }); |
| } |
| |
| public static RowSize of(Row row) { |
| return new RowSize(sizeInBytes(row)); |
| } |
| |
| private static long sizeInBytes(Row row) { |
| return RowCoder.estimatedSizeBytes(row); |
| } |
| |
| private long sizeInBytes; |
| |
| private RowSize(long sizeInBytes) { |
| this.sizeInBytes = sizeInBytes; |
| } |
| |
| @Override |
| public long sizeInBytes() { |
| return sizeInBytes; |
| } |
| } |