def __init__(self, host, port):
    self.host = host
    self.port = int(port) if port else None
Enters transaction management for a running thread. It must be balanced with
dataset/ETHPy150Open chromium/web-page-replay/platformsettings.py/SystemProxy.__init__--crossover with--dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.4/django/db/backends/__init__.py/BaseDatabaseWrapper.enter_transaction_management