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93 lines
3.1 KiB
93 lines
3.1 KiB
from cppy.cp_util import *
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'''
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注册回调的一个变体
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提供一个中心消息管理器，统一管理消息的订阅和通知
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这是一个示例性质的原型，具体分布式环境下需要调整
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'''
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#################################################
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# The event management
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#################################################
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class EventManager:
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def __init__(self):
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self._subscriptions = {}
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def subscribe(self, event_type, handler):
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self._subscriptions.setdefault(event_type, []).append(handler)
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def publish(self, event):
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event_type = event[0]
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for h in self._subscriptions.get(event_type, []):
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h(event)
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#################################################
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# The application entities
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#################################################
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class DataStorage:
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""" Models the contents of the file """
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def __init__(self, event_manager):
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self._event_manager = event_manager
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self._event_manager.subscribe('load', self.load)
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self._event_manager.subscribe('start', self.produce_words)
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def load(self, event):
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self._data = extract_file_words( event[1] )
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def produce_words(self, event):
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for w in self._data:
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self._event_manager.publish(('word', w))
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self._event_manager.publish(('eof', None))
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class StopWordFilter:
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""" Models the stop word filter """
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def __init__(self, event_manager):
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self._stop_words = []
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self._event_manager = event_manager
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self._event_manager.subscribe('load', self.load)
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self._event_manager.subscribe('word', self.is_stop_word)
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def load(self, event):
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self._stop_words = get_stopwords()
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def is_stop_word(self, event):
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word = event[1]
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if word not in self._stop_words:
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self._event_manager.publish(('valid_word', word))
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class WordFrequencyCounter:
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""" Keeps the word frequency data """
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def __init__(self, event_manager):
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self._word_freqs = {}
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self._event_manager = event_manager
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self._event_manager.subscribe('valid_word', self.increment_count)
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self._event_manager.subscribe('print', self.print_freqs)
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def increment_count(self, event):
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word = event[1]
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self._word_freqs[word] = self._word_freqs.get(word, 0) + 1
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def print_freqs(self, event):
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print_word_freqs ( sort_dict (self._word_freqs) )
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class WordFrequencyApplication:
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def __init__(self, event_manager):
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self._event_manager = event_manager
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self._event_manager.subscribe('run', self.run)
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self._event_manager.subscribe('eof', self.stop)
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def run(self, event):
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path_to_file = event[1]
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self._event_manager.publish(('load', path_to_file))
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self._event_manager.publish(('start', None))
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def stop(self, event):
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self._event_manager.publish(('print', None))
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if __name__ == "__main__":
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em = EventManager()
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DataStorage(em), StopWordFilter(em), WordFrequencyCounter(em)
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WordFrequencyApplication(em)
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em.publish(('run', testfilepath )) |