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item_070.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 70")
print("Example 1")
def download(item):
return item
def resize(item):
return item
def upload(item):
return item
print("Example 2")
from collections import deque
from threading import Lock
class MyQueue:
def __init__(self):
self.items = deque()
self.lock = Lock()
print("Example 3")
def put(self, item):
with self.lock:
self.items.append(item)
print("Example 4")
def get(self):
with self.lock:
return self.items.popleft()
print("Example 5")
from threading import Thread
import time
class Worker(Thread):
def __init__(self, func, in_queue, out_queue):
super().__init__()
self.func = func
self.in_queue = in_queue
self.out_queue = out_queue
self.polled_count = 0
self.work_done = 0
print("Example 6")
def run(self):
while True:
self.polled_count += 1
try:
item = self.in_queue.get()
except IndexError:
time.sleep(0.01) # 처리할 작업이 없음
except AttributeError:
# 예제 코드에서 쉽게 종료를 시키기 위한 장치.
# 하지만 실전에서는 오류 원인에 따라 적절한 처리를 해야 함.
return
else:
result = self.func(item)
self.out_queue.put(result)
self.work_done += 1
print("Example 7")
download_queue = MyQueue()
resize_queue = MyQueue()
upload_queue = MyQueue()
done_queue = MyQueue()
threads = [
Worker(download, download_queue, resize_queue),
Worker(resize, resize_queue, upload_queue),
Worker(upload, upload_queue, done_queue),
]
print("Example 8")
for thread in threads:
thread.start()
for _ in range(1000):
download_queue.put(object())
print("Example 9")
while len(done_queue.items) < 1000:
# 기다리는 동안 다른 유용한 작업을 수행한다
time.sleep(0.1)
# run 메서드에서 예외를 발생시켜서 모든 스레드를 종료시킨다
for thread in threads:
thread.in_queue = None
thread.join()
print("Example 10")
processed = len(done_queue.items)
polled = sum(t.polled_count for t in threads)
print(f"아이템을 {processed} 개 처리하는 동안 " f" 폴링을 {polled} 번 수행함")
print("Example 11")
from queue import Queue
my_queue = Queue()
def consumer():
print("소비자 대기중")
my_queue.get() # 다음에 보여줄 put()이 실행된 다음에 시행된다
print("소비자 끝남")
thread = Thread(target=consumer)
thread.start()
print("생산자 put 실행")
my_queue.put(object()) # 앞에서 본 get()이 실행되기 전에 실행된다.
print("생산자 끝남")
thread.join()
print("Example 13")
my_queue = Queue(1) # 버퍼 크기 1
def consumer():
time.sleep(0.1) # 대기
my_queue.get() # 두번째로 실행됨
print("소비자 얻음 1")
my_queue.get() # 네번째로 실행됨
print("소비자 얻음 2")
print("소비자 끝남")
thread = Thread(target=consumer)
thread.start()
print("Example 14")
my_queue.put(object()) # 첫번째로 실행됨
print("생산자 put 1")
my_queue.put(object()) # 세번째로 실행됨
print("생산자 put 2")
print("생산자 끝남")
thread.join()
print("Example 15")
in_queue = Queue()
def consumer():
print("소비자 대기중")
work = in_queue.get() # 두 번째로 실행됨
print("소비자 작업중")
# 작업을 수행한다
print("소비자 끝남")
in_queue.task_done() # 세 번째로 실행됨
thread = Thread(target=consumer)
thread.start()
print("Example 16")
print("생산자 put 하는 중")
in_queue.put(object()) # 첫 번째로 실행됨
print("생산자 대기중")
in_queue.join() # 네 번째로 실행됨
print("생산자 끝남")
thread.join()
print("Example 17")
from queue import ShutDown
my_queue2 = Queue()
def consumer():
while True:
try:
item = my_queue2.get()
except ShutDown:
print("끝내는 중!")
return
else:
print("아이템 얻음", item)
my_queue2.task_done()
thread = Thread(target=consumer)
my_queue2.put(1)
my_queue2.put(2)
my_queue2.put(3)
my_queue2.shutdown()
thread.start()
my_queue2.join()
thread.join()
print("끝남")
print("Example 18")
class StoppableWorker(Thread):
def __init__(self, func, in_queue, out_queue):
super().__init__()
self.func = func
self.in_queue = in_queue
self.out_queue = out_queue
def run(self):
while True:
try:
item = self.in_queue.get()
except ShutDown:
return
else:
result = self.func(item)
self.out_queue.put(result)
self.in_queue.task_done()
print("Example 19")
download_queue = Queue()
resize_queue = Queue(100)
upload_queue = Queue(100)
done_queue = Queue()
threads = [
StoppableWorker(download, download_queue, resize_queue),
StoppableWorker(resize, resize_queue, upload_queue),
StoppableWorker(upload, upload_queue, done_queue),
]
for thread in threads:
thread.start()
print("Example 20")
for _ in range(1000):
download_queue.put(object())
print("Example 21")
download_queue.shutdown()
download_queue.join()
resize_queue.shutdown()
resize_queue.join()
upload_queue.shutdown()
upload_queue.join()
print("Example 22")
done_queue.shutdown()
counter = 0
while True:
try:
item = done_queue.get()
except ShutDown:
break
else:
# 원소를 처리한다
done_queue.task_done()
counter += 1
done_queue.join()
for thread in threads:
thread.join()
print(counter, "개의 아이템 끝남")
print("Example 23")
def start_threads(count, *args):
threads = [StoppableWorker(*args) for _ in range(count)]
for thread in threads:
thread.start()
return threads
def drain_queue(input_queue):
input_queue.shutdown()
counter = 0
while True:
try:
item = input_queue.get()
except ShutDown:
break
else:
input_queue.task_done()
counter += 1
input_queue.join()
return counter
print("Example 24")
download_queue = Queue()
resize_queue = Queue(100)
upload_queue = Queue(100)
done_queue = Queue()
threads = (
start_threads(3, download, download_queue, resize_queue)
+ start_threads(4, resize, resize_queue, upload_queue)
+ start_threads(5, upload, upload_queue, done_queue)
)
print("Example 25")
for _ in range(2000):
download_queue.put(object())
download_queue.shutdown()
download_queue.join()
resize_queue.shutdown()
resize_queue.join()
upload_queue.shutdown()
upload_queue.join()
counter = drain_queue(done_queue)
for thread in threads:
thread.join()
print(counter, "개의 아이템 끝남")