Python设计模式(二十)【中介模式】

我不去想是否能够成功，既然选择了远方，便只顾风雨兼程；我不去想，身后会不会袭来寒风冷雨，既然目标是地平线，留给世界的只能是背影。

# -*- coding: utf-8 -*-import randomimport timeclass TC:    def __init__(self):        self._tm = None        self._bProblem = 0    def setup(self):        print("设置测试")        time.sleep(0.1)        self._tm.prepareReporting()    def execute(self):        if not self._bProblem:            print("执行测试")            time.sleep(0.1)        else:            print("问题设置。测试不执行。")    def tearDown(self):        if not self._bProblem:            print("拆除")            time.sleep(0.1)            self._tm.publishReport()        else:            print("测试不执行。没有拆除需要")    def setTM(self, tm):        self._tm = tm    def setProblem(self, value):        self._bProblem = valueclass Reporter:    def __init__(self):        self._tm = None    def prepare(self):        print("报表类正准备报告结果")        time.sleep(0.1)    def report(self):        print("报告测试的结果")        time.sleep(0.1)    def setTM(self, tm):        self._tm = tmclass DB:    def __init__(self):        self._tm = None    def insert(self):        print("增加执行开始状态在数据库")        time.sleep(0.1)        # 下面的代码是模拟从DB到TC通信        if random.randrange(1, 4) == 3:            return -1    def update(self):        print("更新数据库中的测试结果")        time.sleep(0.1)    def setTM(self, tm):        self._tm = tmclass TestManager:    def __init__(self):        self._reporter = None        self._db = None        self._tc = None    def prepareReporting(self):        rvalue = self._db.insert()        if rvalue == -1:            self._tc.setProblem(1)            self._reporter.prepare()    def setReporter(self, reporter):        self._reporter = reporter    def setDB(self, db):        self._db = db    def publishReport(self):        self._db.update()        self._reporter.report()    def setTC(self, tc):        self._tc = tcif __name__ == '__main__':    reporter = Reporter()    db = DB()    tm = TestManager()    tm.setReporter(reporter)    tm.setDB(db)    reporter.setTM(tm)    db.setTM(tm)    #为了简化，我们在相同的测试循环。    #实际上，它可能是有关各种独特的测试类和它们的对象    for i in range(3):        tc = TC()        tc.setTM(tm)        tm.setTC(tc)        tc.setup()        tc.execute()        tc.tearDown()

结果如图: