新增设计模式测试

zhanghe06 · zhanghe06 · commit 059657f9e088 · 2017-07-23T16:34:05.000+08:00
diff --git a/test/design_pattern/observer.py b/test/design_pattern/observer.py
@@ -0,0 +1,76 @@
+#!/usr/bin/env python
+# encoding: utf-8
+
+"""
+@author: zhanghe
+@software: PyCharm
+@file: observer.py
+@time: 2017/6/12 &#19979;&#21320;6:06
+"""
+
+
+class AbstractSubject(object):
+    def register(self, listener):
+        raise NotImplementedError("Must subclass me")
+
+    def de_register(self, listener):
+        raise NotImplementedError("Must subclass me")
+
+    def notify_listeners(self, event):
+        raise NotImplementedError("Must subclass me")
+
+
+class Listener(object):
+    def __init__(self, name, subject):
+        self.name = name
+        subject.register(self)
+
+    def notify(self, event):
+        print self.name, "received event", event
+
+
+class Subject(AbstractSubject):
+    def __init__(self):
+        self.listeners = []
+        self.data = None
+
+    def get_user_action(self):
+        self.data = raw_input('Enter something to do:')
+        return self.data
+
+    # Implement abstract Class AbstractSubject
+
+    def register(self, listener):
+        self.listeners.append(listener)
+
+    def de_register(self, listener):
+        self.listeners.remove(listener)
+
+    def notify_listeners(self, event):
+        for listener in self.listeners:
+            listener.notify(event)
+
+
+if __name__ == "__main__":
+    # make a subject object to spy on
+    subject_obj = Subject()
+
+    # register two listeners to monitor it.
+    listenerA = Listener("<listener A>", subject_obj)
+    listenerB = Listener("<listener B>", subject_obj)
+
+    # simulated event
+    subject_obj.notify_listeners("<event 1>")
+    # outputs:
+    #     <listener A> received event <event 1>
+    #     <listener B> received event <event 1>
+
+    action = subject_obj.get_user_action()
+    subject_obj.notify_listeners(action)
+    # Enter something to do:hello
+    # outputs:
+    #     <listener A> received event hello
+    #     <listener B> received event hello
+
+
+# https://zh.wikipedia.org/wiki/&#35266;&#23519;&#32773;&#27169;&#24335;
