class SingletonApp (object):
## Instance of the singleton class
__inst = None
#-----------------------------------------------------------------------------
## Singleton constructor. Sets up logger and eventManager
def __new__(cls):
if not cls.__inst:
cls.__inst = super(SingletonApp,cls).__new__(cls)
## Initialise log and send info message
Log(level="DEBUG").info("SingletonApp instance created")
cls.__inst._setup()
return cls.__inst
#-----------------------------------------------------------------------------
## Destructor
def __del__():
Log().info("SingletonApp deleted")
#-----------------------------------------------------------------------------
## Setup the eventManager and hook "singletonApp_setup"
def _setup(self):
## An instance of events.eventManager.EventManager. Initialised in
# SingletonApp._setup and deleted in SingletonApp.close
self.eventManager = EventManager()
Log().debug("SingletonApp setup")
self.eventManager.hook("singletonApp_setup")
#-----------------------------------------------------------------------------
## Safe shutdown and dereference of variables.
# This stops circular references stopping the garbage collection
def close(self):
del self.eventManager
Log().info("SingletonApp closed")
