/
WritePendingStream.java
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/
WritePendingStream.java
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/*
* Copyright 2020 Google LLC
*
* Licensed 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 com.example.bigquerystorage;
// [START bigquerystorage_jsonstreamwriter_pending]
import com.google.api.core.ApiFuture;
import com.google.cloud.bigquery.storage.v1beta2.AppendRowsResponse;
import com.google.cloud.bigquery.storage.v1beta2.BatchCommitWriteStreamsRequest;
import com.google.cloud.bigquery.storage.v1beta2.BatchCommitWriteStreamsResponse;
import com.google.cloud.bigquery.storage.v1beta2.BigQueryWriteClient;
import com.google.cloud.bigquery.storage.v1beta2.CreateWriteStreamRequest;
import com.google.cloud.bigquery.storage.v1beta2.FinalizeWriteStreamResponse;
import com.google.cloud.bigquery.storage.v1beta2.JsonStreamWriter;
import com.google.cloud.bigquery.storage.v1beta2.TableName;
import com.google.cloud.bigquery.storage.v1beta2.WriteStream;
import com.google.protobuf.Descriptors.DescriptorValidationException;
import java.io.IOException;
import java.util.concurrent.ExecutionException;
import org.json.JSONArray;
import org.json.JSONObject;
public class WritePendingStream {
public static void runWritePendingStream()
throws DescriptorValidationException, InterruptedException, IOException {
// TODO(developer): Replace these variables before running the sample.
String projectId = "MY_PROJECT_ID";
String datasetName = "MY_DATASET_NAME";
String tableName = "MY_TABLE_NAME";
writePendingStream(projectId, datasetName, tableName);
}
public static void writePendingStream(String projectId, String datasetName, String tableName)
throws DescriptorValidationException, InterruptedException, IOException {
try (BigQueryWriteClient client = BigQueryWriteClient.create()) {
// Initialize a write stream for the specified table.
// For more information on WriteStream.Type, see:
// https://googleapis.dev/java/google-cloud-bigquerystorage/latest/com/google/cloud/bigquery/storage/v1beta2/WriteStream.Type.html
WriteStream stream = WriteStream.newBuilder().setType(WriteStream.Type.PENDING).build();
TableName parentTable = TableName.of(projectId, datasetName, tableName);
CreateWriteStreamRequest createWriteStreamRequest =
CreateWriteStreamRequest.newBuilder()
.setParent(parentTable.toString())
.setWriteStream(stream)
.build();
WriteStream writeStream = client.createWriteStream(createWriteStreamRequest);
// Use the JSON stream writer to send records in JSON format.
// For more information about JsonStreamWriter, see:
// https://googleapis.dev/java/google-cloud-bigquerystorage/latest/com/google/cloud/bigquery/storage/v1beta2/JsonStreamWriter.html
try (JsonStreamWriter writer =
JsonStreamWriter.newBuilder(writeStream.getName(), writeStream.getTableSchema(), client)
.build()) {
// Append 10 JSON objects to the stream.
for (int i = 0; i < 10; i++) {
// Create a JSON object that is compatible with the table schema.
JSONObject record = new JSONObject();
record.put("col1", String.format("batch-record %03d", i));
JSONArray jsonArr = new JSONArray();
jsonArr.put(record);
ApiFuture<AppendRowsResponse> future = writer.append(jsonArr);
AppendRowsResponse response = future.get();
}
FinalizeWriteStreamResponse finalizeResponse =
client.finalizeWriteStream(writeStream.getName());
System.out.println("Rows written: " + finalizeResponse.getRowCount());
}
// Commit the streams.
BatchCommitWriteStreamsRequest commitRequest =
BatchCommitWriteStreamsRequest.newBuilder()
.setParent(parentTable.toString())
.addWriteStreams(writeStream.getName())
.build();
BatchCommitWriteStreamsResponse commitResponse =
client.batchCommitWriteStreams(commitRequest);
System.out.println("Appended and committed records successfully.");
} catch (ExecutionException e) {
// If the wrapped exception is a StatusRuntimeException, check the state of the operation.
// If the state is INTERNAL, CANCELLED, or ABORTED, you can retry. For more information, see:
// https://grpc.github.io/grpc-java/javadoc/io/grpc/StatusRuntimeException.html
System.out.println(e);
}
}
}
// [END bigquerystorage_jsonstreamwriter_pending]