spark-instrumented-optimizer/python/pyspark/testing/utils.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
#
# 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.
#
import os
import struct
import sys
import unittest

from pyspark import SparkContext, SparkConf


have_scipy = False
have_numpy = False
try:
    import scipy.sparse
    have_scipy = True
except:
    # No SciPy, but that's okay, we'll skip those tests
    pass
try:
    import numpy as np
    have_numpy = True
except:
    # No NumPy, but that's okay, we'll skip those tests
    pass


SPARK_HOME = os.environ["SPARK_HOME"]


def read_int(b):
    return struct.unpack("!i", b)[0]


def write_int(i):
    return struct.pack("!i", i)


class QuietTest(object):
    def __init__(self, sc):
        self.log4j = sc._jvm.org.apache.log4j

    def __enter__(self):
        self.old_level = self.log4j.LogManager.getRootLogger().getLevel()
        self.log4j.LogManager.getRootLogger().setLevel(self.log4j.Level.FATAL)

    def __exit__(self, exc_type, exc_val, exc_tb):
        self.log4j.LogManager.getRootLogger().setLevel(self.old_level)


class PySparkTestCase(unittest.TestCase):

    def setUp(self):
        self._old_sys_path = list(sys.path)
        class_name = self.__class__.__name__
        self.sc = SparkContext('local[4]', class_name)

    def tearDown(self):
        self.sc.stop()
        sys.path = self._old_sys_path


class ReusedPySparkTestCase(unittest.TestCase):

    @classmethod
    def conf(cls):
        """
        Override this in subclasses to supply a more specific conf
        """
        return SparkConf()

    @classmethod
    def setUpClass(cls):
        cls.sc = SparkContext('local[4]', cls.__name__, conf=cls.conf())

    @classmethod
    def tearDownClass(cls):
        cls.sc.stop()


class ByteArrayOutput(object):
    def __init__(self):
        self.buffer = bytearray()

    def write(self, b):
        self.buffer += b

    def close(self):
        pass