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Twisted application runner.
@cvar _log: The logger attached to this class.
@ivar _reactor: The reactor to start and run the application in.
@ivar _pidFile: The file to store the running process ID in.
@ivar _kill: Whether this runner should kill an existing running
instance of the application.
@ivar _defaultLogLevel: The default log level to start the logging
system with.
@ivar _logFile: A file stream to write logging output to.
@ivar _fileLogObserverFactory: A factory for the file log observer to
use when starting the logging system.
@ivar _whenRunning: Hook to call after the reactor is running;
this is where the application code that relies on the reactor gets
called.
@ivar _whenRunningArguments: Keyword arguments to pass to
C{whenRunning} when it is called.
@ivar _reactorExited: Hook to call after the reactor exits.
@ivar _reactorExitedArguments: Keyword arguments to pass to
C{reactorExited} when it is called.
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