Examples with BigQueryWriteClient com.google.cloud.bigquery.storage.v1.BigQueryWriteClient used on opensource projects

Example 11 with BigQueryWriteClient

use of com.google.cloud.bigquery.storage.v1.BigQueryWriteClient in project java-bigquerystorage by googleapis.

the class WriteBufferedStream method writeBufferedStream.

public static void writeBufferedStream(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/v1/WriteStream.Type.html
        WriteStream stream = WriteStream.newBuilder().setType(WriteStream.Type.BUFFERED).build();
        TableName parentTable = TableName.of(projectId, datasetName, tableName);
        CreateWriteStreamRequest createWriteStreamRequest = CreateWriteStreamRequest.newBuilder().setParent(parentTable.toString()).setWriteStream(stream).build();
        WriteStream writeStream = client.createWriteStream(createWriteStreamRequest);
        // 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()).build()) {
            // Write two batches to the stream, each with 10 JSON records.
            for (int i = 0; i < 2; i++) {
                JSONArray jsonArr = new JSONArray();
                for (int j = 0; j < 10; j++) {
                    // Create a JSON object that is compatible with the table schema.
                    JSONObject record = new JSONObject();
                    record.put("col1", String.format("buffered-record %03d", i));
                    jsonArr.put(record);
                }
                ApiFuture<AppendRowsResponse> future = writer.append(jsonArr);
                AppendRowsResponse response = future.get();
            }
            // Flush the buffer.
            FlushRowsRequest flushRowsRequest = FlushRowsRequest.newBuilder().setWriteStream(writeStream.getName()).setOffset(// Advance the cursor to the latest record.
            Int64Value.of(10 * 2 - 1)).build();
            FlushRowsResponse flushRowsResponse = client.flushRows(flushRowsRequest);
        // You can continue to write to the stream after flushing the buffer.
        }
        // Finalize the stream after use.
        FinalizeWriteStreamRequest finalizeWriteStreamRequest = FinalizeWriteStreamRequest.newBuilder().setName(writeStream.getName()).build();
        client.finalizeWriteStream(finalizeWriteStreamRequest);
        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);
    }
}