Python设计模式之中介模式简单示例

import time
class TC:
  def __init__(self):
    self._tm = tm
    self._bProblem = 0
  def setup(self):
    print "Setting up the Test"
    time.sleep(1)
    self._tm.prepareReporting()
  def execute(self):
    if not self._bProblem:
      print "Executing the test"
      time.sleep(1)
    else:
      print "Problem in setup,Test not executed."
  def tearDown(self):
    if not self._bProblem:
      print "Tearing down"
      time.sleep(1)
      self._tm.publishReport()
    else:
      print "Test not executed.No tear down required."
  def setTM(self, TM):
    self._tm = tm
  def setProblem(self, value):
    self._bProblem = value
class Reporter:
  def __init__(self):
    self._tm = None
  def prepare(self):
    print "Reporter Class is preparing to report the results"
    time.sleep(1)
  def report(self):
    print "Reporting the results of Test"
    time.sleep(1)
  def setTM(self, TM):
    self._tm = tm
class DB:
  def __init__(self):
    self._tm = None
  def insert(self):
    print "Inserting the execution begin status in the Database"
    time.sleep(1)
    import random
    if random.randrange(1,4) == 3:
      return -1
  def update(self):
    print "Updating the test results in Database"
    time.sleep(1)
  def setTM(self, TM):
    self._tm = tm
class 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()
    rvalue = self._reporter.report()
  def setTC(self, tc):
    self._tc = tc
if __name__ == '__main__':
  reporter = Reporter()
  db = DB()
  tm = TestManager()
  tm.setReporter(reporter)
  tm.setDB(db)
  reporter.setTM(tm)
  db.setTM(tm)
  while(1):
    tc = TC()
    tc.setTM(tm)
    tm.setTC(tc)
    tc.setup()
    tc.execute()
    tc.tearDown()