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//lib/python2.7/site-packages/tuned/monitors/base.py

import tuned.logs
log = tuned.logs.get()

__all__ = ["Monitor"]

class Monitor(object):
	"""
	Base class for all monitors.

Monitors provide data about the running system to Plugin objects, which use the data
	to tune system parameters.

Following methods require reimplementation:
	  - _init_available_devices(cls)
	  - update(cls)
	"""

# class properties

@classmethod
	def _init_class(cls):
		cls._class_initialized = False
		cls._instances = set()
		cls._available_devices = set()
		cls._updating_devices = set()
		cls._load = {}

cls._init_available_devices()
		assert isinstance(cls._available_devices, set)
		cls._class_initialized = True
		log.debug("available devices: %s" % ", ".join(cls._available_devices))

@classmethod
	def _init_available_devices(cls):
		raise NotImplementedError()

@classmethod
	def _update_available_devices(cls):
		cls._init_available_devices()
		log.debug("available devices updated to: %s"
				% ", ".join(cls._available_devices))

@classmethod
	def get_available_devices(cls):
		return cls._available_devices

@classmethod
	def update(cls):
		raise NotImplementedError()

@classmethod
	def _register_instance(cls, instance):
		cls._instances.add(instance)

@classmethod
	def _deregister_instance(cls, instance):
		cls._instances.remove(instance)

@classmethod
	def _refresh_updating_devices(cls):
		new_updating = set()
		for instance in cls._instances:
			new_updating |= instance.devices
		cls._updating_devices.clear()
		cls._updating_devices.update(new_updating)

@classmethod
	def instances(cls):
		return cls._instances

# instance properties

def __init__(self, devices = None):
		if not hasattr(self, "_class_initialized"):
			self._init_class()
			assert hasattr(self, "_class_initialized")

self._register_instance(self)

if devices is not None:
			self.devices = devices
		else:
			self.devices = self.get_available_devices()

self.update()

def __del__(self):
		try:
			self.cleanup()
		except:
			pass

def cleanup(self):
		self._deregister_instance(self)
		self._refresh_updating_devices()

@property
	def devices(self):
		return self._devices

@devices.setter
	def devices(self, value):
		new_devices = self._available_devices & set(value)
		self._devices = new_devices
		self._refresh_updating_devices()

def add_device(self, device):
		assert (isinstance(device,str) or isinstance(device,unicode))
		self._update_available_devices()
		if device in self._available_devices:
			self._devices.add(device)
			self._updating_devices.add(device)

def remove_device(self, device):
		assert (isinstance(device,str) or isinstance(device,unicode))
		if device in self._devices:
			self._devices.remove(device)
			self._updating_devices.remove(device)

def get_load(self):
		return dict([dev_load for dev_load in list(self._load.items()) if dev_load[0] in self._devices])

def get_device_load(self, device):
		return self._load.get(device, None)