| /* |
| * 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.io.gcp.bigquery; |
| |
| import static org.apache.beam.vendor.guava.v26_0_jre.com.google.common.base.Preconditions.checkState; |
| |
| import com.google.api.services.bigquery.model.TableRow; |
| import java.io.IOException; |
| import java.nio.channels.Channels; |
| import java.nio.channels.WritableByteChannel; |
| import java.nio.charset.StandardCharsets; |
| import java.util.UUID; |
| import org.apache.beam.sdk.coders.Coder; |
| import org.apache.beam.sdk.coders.Coder.Context; |
| import org.apache.beam.sdk.io.FileSystems; |
| import org.apache.beam.sdk.io.fs.ResourceId; |
| import org.apache.beam.sdk.util.MimeTypes; |
| import org.apache.beam.vendor.guava.v26_0_jre.com.google.common.io.CountingOutputStream; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** Writes {@link TableRow} objects out to a file. Used when doing batch load jobs into BigQuery. */ |
| class TableRowWriter implements AutoCloseable { |
| private static final Logger LOG = LoggerFactory.getLogger(TableRowWriter.class); |
| |
| private static final Coder<TableRow> CODER = TableRowJsonCoder.of(); |
| private static final byte[] NEWLINE = "\n".getBytes(StandardCharsets.UTF_8); |
| private ResourceId resourceId; |
| private WritableByteChannel channel; |
| private CountingOutputStream out; |
| |
| private boolean isClosed = false; |
| |
| static final class Result { |
| final ResourceId resourceId; |
| final long byteSize; |
| |
| public Result(ResourceId resourceId, long byteSize) { |
| this.resourceId = resourceId; |
| this.byteSize = byteSize; |
| } |
| } |
| |
| TableRowWriter(String basename) throws Exception { |
| String uId = UUID.randomUUID().toString(); |
| resourceId = FileSystems.matchNewResource(basename + uId, false); |
| LOG.info("Opening TableRowWriter to {}.", resourceId); |
| channel = FileSystems.create(resourceId, MimeTypes.TEXT); |
| out = new CountingOutputStream(Channels.newOutputStream(channel)); |
| } |
| |
| void write(TableRow value) throws Exception { |
| CODER.encode(value, out, Context.OUTER); |
| out.write(NEWLINE); |
| } |
| |
| long getByteSize() { |
| return out.getCount(); |
| } |
| |
| @Override |
| public void close() throws IOException { |
| checkState(!isClosed, "Already closed"); |
| isClosed = true; |
| channel.close(); |
| } |
| |
| Result getResult() { |
| checkState(isClosed, "Not yet closed"); |
| return new Result(resourceId, out.getCount()); |
| } |
| } |