| /* |
| * 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.dataflow.worker; |
| |
| import java.io.IOException; |
| import java.nio.ByteBuffer; |
| import java.nio.channels.Channels; |
| import java.nio.channels.WritableByteChannel; |
| import org.apache.avro.Schema; |
| import org.apache.avro.file.DataFileWriter; |
| import org.apache.avro.generic.GenericDatumWriter; |
| import org.apache.beam.runners.dataflow.worker.util.common.worker.Sink; |
| import org.apache.beam.sdk.coders.Coder; |
| import org.apache.beam.sdk.io.FileSystems; |
| import org.apache.beam.sdk.io.fs.ResourceId; |
| import org.apache.beam.sdk.util.CoderUtils; |
| import org.apache.beam.sdk.util.MimeTypes; |
| import org.apache.beam.vendor.guava.v26_0_jre.com.google.common.annotations.VisibleForTesting; |
| |
| /** |
| * A sink that writes Avro files. Records are written to the Avro file as a series of byte arrays. |
| * The coder provided is used to serialize each record into a byte array. |
| * |
| * @param <T> the type of the elements written to the sink |
| */ |
| public class AvroByteSink<T> extends Sink<T> { |
| |
| final Coder<T> coder; |
| @VisibleForTesting final ResourceId resourceId; |
| private final Schema schema = Schema.create(Schema.Type.BYTES); |
| |
| public AvroByteSink(ResourceId resourceId, Coder<T> coder) { |
| this.coder = coder; |
| this.resourceId = resourceId; |
| } |
| |
| @Override |
| public SinkWriter<T> writer() throws IOException { |
| return new AvroByteFileWriter(); |
| } |
| |
| class AvroByteFileWriter implements SinkWriter<T> { |
| DataFileWriter<ByteBuffer> fileWriter; |
| |
| public AvroByteFileWriter() throws IOException { |
| WritableByteChannel writer = FileSystems.create(resourceId, MimeTypes.BINARY); |
| |
| fileWriter = new DataFileWriter<>(new GenericDatumWriter<ByteBuffer>(schema)); |
| fileWriter.create(schema, Channels.newOutputStream(writer)); |
| } |
| |
| @Override |
| public long add(T value) throws IOException { |
| byte[] encodedElem = CoderUtils.encodeToByteArray(coder, value); |
| ByteBuffer encodedBuffer = ByteBuffer.wrap(encodedElem); |
| fileWriter.append(encodedBuffer); |
| return encodedElem.length; |
| } |
| |
| @Override |
| public void close() throws IOException { |
| fileWriter.close(); |
| } |
| |
| @Override |
| public void abort() throws IOException { |
| // DataFileWriter implements Closeable and is idempotent. |
| fileWriter.close(); |
| } |
| } |
| } |