parquet_flask/parquet_stat_extractor/local_spark_session.py

# 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
#
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from pyspark.sql import SparkSession

from parquet_flask.utils.singleton import Singleton


class LocalSparkSession(metaclass=Singleton):
    def __init__(self):
        self.__spark_session = None

    def get_spark_session(self) -> SparkSession:
        if self.__spark_session is None:

            self.__spark_session = SparkSession.builder \
                .appName('TestAppName') \
                .getOrCreate()
        return self.__spark_session