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'''
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多线程各个模块比较乱的但是协作序贯的完成了数据处理
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各个组件完全不能互操作，仅依靠队列发消息进行协作
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适合环节多，数据可分块，有IO-计算性能设计考量要求，让各个模块自己适应调整
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在某些情况下，可以避免复杂的控制流设计，使代码简洁
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'''
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from threading import Thread
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from queue import Queue
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from cppy.cp_util import *
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class ActiveWFObject(Thread):
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def __init__(self):
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super().__init__()
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self.queue = Queue()
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self._stopMe = False
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self.start()
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def run(self):
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while not self._stopMe:
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message = self.queue.get()
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self._dispatch(message)
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if message[0] == 'over':
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break
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def send(receiver, message):
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receiver.queue.put(message)
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class DataStorageManager(ActiveWFObject):
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""" Models the contents of the file """
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_data = ''
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def _dispatch(self, message):
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if message[0] == 'init':
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self._init(message[1:])
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elif message[0] == 'send_word_freqs':
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self._process_words(message[1:])
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else:
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# forward
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send(self._stop_word_manager, message)
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def _init(self, message):
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self._data = extract_file_words(message[0])
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self._stop_word_manager = message[1]
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def _process_words(self, message):
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recipient = message[0]
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for w in self._data:
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send(self._stop_word_manager, ['filter', w])
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send(self._stop_word_manager, ['topWord', recipient])
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class StopWordManager(ActiveWFObject):
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""" Models the stop word filter """
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_stop_words = []
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def _dispatch(self, message):
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if message[0] == 'init':
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self._init(message[1:])
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elif message[0] == 'filter':
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return self._filter(message[1:])
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else:
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# forward
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send(self._word_freqs_manager, message)
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def _init(self, message):
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self._stop_words = get_stopwords()
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self._word_freqs_manager = message[0]
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def _filter(self, message):
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word = message[0]
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if word not in self._stop_words:
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send(self._word_freqs_manager, ['word', word])
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class WordFrequencyManager(ActiveWFObject):
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""" Keeps the word frequency data """
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_word_freqs = {}
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def _dispatch(self, message):
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if message[0] == 'word':
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self._increment_count(message[1:])
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elif message[0] == 'topWord':
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self._topWord(message[1:])
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def _increment_count(self, message):
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word, = message
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self._word_freqs[word] = self._word_freqs.get(word, 0) + 1
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def _topWord(self, message):
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recipient = message[0]
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freqs_sorted = sort_dict ( self._word_freqs )
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send(recipient, ['topWord', freqs_sorted])
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class MyController(ActiveWFObject):
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def _dispatch(self, message):
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if message[0] == 'run':
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self._run(message[1:])
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elif message[0] == 'topWord':
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self._display(message[1:])
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else:
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raise Exception("Message not understood " + message[0])
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def _run(self, message):
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self._storage_manager, = message
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send(self._storage_manager, ['send_word_freqs', self])
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def _display(self, message):
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word_freqs, = message
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print_word_freqs( word_freqs)
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send(self._storage_manager, ['over'])
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self._stopMe = True
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if __name__ == '__main__':
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word_freq_manager = WordFrequencyManager()
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stop_word_manager = StopWordManager()
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storage_manager = DataStorageManager()
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wfcontroller = MyController()
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send(storage_manager, ['init', testfilepath, stop_word_manager])
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send(stop_word_manager, ['init', word_freq_manager])
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send(wfcontroller, ['run', storage_manager])
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# 等待所有管理器完成工作
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threads = [word_freq_manager, stop_word_manager, storage_manager, wfcontroller]
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for thread in threads: thread.join() |
