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item_052.py
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#!/usr/bin/env PYTHONHASHSEED=1234 python3
# Copyright 2014-2024 Brett Slatkin, Pearson Education Inc.
#
# 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.
### 책 예제에 맞는 환경 설정을 시작함
import random
random.seed(1234)
import logging
from pprint import pprint
from sys import stdout as STDOUT
# 모든 출력을 임시 디렉터리로 보냄
import atexit
import gc
import io
import os
import tempfile
TEST_DIR = tempfile.TemporaryDirectory()
atexit.register(TEST_DIR.cleanup)
# 윈도우에서 프로세스가 제대로 종료되도록 함
OLD_CWD = os.getcwd()
atexit.register(lambda: os.chdir(OLD_CWD))
os.chdir(TEST_DIR.name)
def close_open_files():
everything = gc.get_objects()
for obj in everything:
if isinstance(obj, io.IOBase):
obj.close()
atexit.register(close_open_files)
### 책 예제에 맞는 환경설정 끝
print("아이템 52")
print("Example 1")
class InputData:
def read(self):
raise NotImplementedError
print("Example 2")
class PathInputData(InputData):
def __init__(self, path):
super().__init__()
self.path = path
def read(self):
with open(self.path) as f:
return f.read()
print("Example 3")
class Worker:
def __init__(self, input_data):
self.input_data = input_data
self.result = None
def map(self):
raise NotImplementedError
def reduce(self, other):
raise NotImplementedError
print("Example 4")
class LineCountWorker(Worker):
def map(self):
data = self.input_data.read()
self.result = data.count("\n")
def reduce(self, other):
self.result += other.result
print("Example 5")
import os
def generate_inputs(data_dir):
for name in os.listdir(data_dir):
yield PathInputData(os.path.join(data_dir, name))
print("Example 6")
def create_workers(input_list):
workers = []
for input_data in input_list:
workers.append(LineCountWorker(input_data))
return workers
print("Example 7")
from threading import Thread
def execute(workers):
threads = [Thread(target=w.map) for w in workers]
for thread in threads:
thread.start()
for thread in threads:
thread.join()
first, *rest = workers
for worker in rest:
first.reduce(worker)
return first.result
print("Example 8")
def mapreduce(data_dir):
inputs = generate_inputs(data_dir)
workers = create_workers(inputs)
return execute(workers)
print("Example 9")
import os
import random
def write_test_files(tmpdir):
os.makedirs(tmpdir)
for i in range(100):
with open(os.path.join(tmpdir, str(i)), "w") as f:
f.write("\n" * random.randint(0, 100))
tmpdir = "test_inputs"
write_test_files(tmpdir)
result = mapreduce(tmpdir)
print(f"모두 {result} 줄이 있음")
print("Example 10")
class GenericInputData:
def read(self):
raise NotImplementedError
@classmethod
def generate_inputs(cls, config):
raise NotImplementedError
print("Example 11")
class PathInputData(GenericInputData):
def __init__(self, path):
super().__init__()
self.path = path
def read(self):
with open(self.path) as f:
return f.read()
@classmethod
def generate_inputs(cls, config):
data_dir = config["data_dir"]
for name in os.listdir(data_dir):
yield cls(os.path.join(data_dir, name))
print("Example 12")
class GenericWorker:
def __init__(self, input_data):
self.input_data = input_data
self.result = None
def map(self):
raise NotImplementedError
def reduce(self, other):
raise NotImplementedError
@classmethod
def create_workers(cls, input_class, config):
workers = []
for input_data in input_class.generate_inputs(config):
workers.append(cls(input_data))
return workers
print("Example 13")
class LineCountWorker(GenericWorker): # Changed
def map(self):
data = self.input_data.read()
self.result = data.count("\n")
def reduce(self, other):
self.result += other.result
print("Example 14")
def mapreduce(worker_class, input_class, config):
workers = worker_class.create_workers(input_class, config)
return execute(workers)
print("Example 15")
config = {"data_dir": tmpdir}
result = mapreduce(LineCountWorker, PathInputData, config)
print(f"모두 {result} 줄이 있음")