Examples with DataSourceWriterContext com.google.cloud.spark.bigquery.v2.context.DataSourceWriterContext used on opensource projects

Example 1 with DataSourceWriterContext

use of com.google.cloud.spark.bigquery.v2.context.DataSourceWriterContext in project spark-bigquery-connector by GoogleCloudDataproc.

the class BigQueryDataSourceV2 method createWriter.

/**
 * Returning a DataSourceWriter for the specified parameters. In case the table already exist and
 * the SaveMode is "Ignore", an Optional.empty() is returned.
 */
@Override
public Optional<DataSourceWriter> createWriter(String writeUUID, StructType schema, SaveMode mode, DataSourceOptions options) {
    Injector injector = createInjector(schema, options.asMap(), new BigQueryDataSourceWriterModule(writeUUID, schema, mode));
    // first verify if we need to do anything at all, based on the table existence and the save
    // mode.
    BigQueryClient bigQueryClient = injector.getInstance(BigQueryClient.class);
    SparkBigQueryConfig config = injector.getInstance(SparkBigQueryConfig.class);
    TableInfo table = bigQueryClient.getTable(config.getTableId());
    if (table != null) {
        // table already exists
        if (mode == SaveMode.Ignore) {
            return Optional.empty();
        }
        if (mode == SaveMode.ErrorIfExists) {
            throw new IllegalArgumentException(String.format("SaveMode is set to ErrorIfExists and table '%s' already exists. Did you want " + "to add data to the table by setting the SaveMode to Append? Example: " + "df.write.format.options.mode(\"append\").save()", BigQueryUtil.friendlyTableName(table.getTableId())));
        }
    } else {
        // table does not exist
        // If the CreateDisposition is CREATE_NEVER, and the table does not exist,
        // there's no point in writing the data to GCS in the first place as it going
        // to fail on the BigQuery side.
        boolean createNever = config.getCreateDisposition().map(createDisposition -> createDisposition == JobInfo.CreateDisposition.CREATE_NEVER).orElse(false);
        if (createNever) {
            throw new IllegalArgumentException(String.format("For table %s Create Disposition is CREATE_NEVER and the table does not exists." + " Aborting the insert", BigQueryUtil.friendlyTableName(config.getTableId())));
        }
    }
    DataSourceWriterContext dataSourceWriterContext = null;
    switch(config.getWriteMethod()) {
        case DIRECT:
            dataSourceWriterContext = injector.getInstance(BigQueryDirectDataSourceWriterContext.class);
            break;
        case INDIRECT:
            dataSourceWriterContext = injector.getInstance(BigQueryIndirectDataSourceWriterContext.class);
            break;
    }
    return Optional.of(new BigQueryDataSourceWriter(dataSourceWriterContext));
}