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Direktori : /lib/python2.7/site-packages/tuned/monitors/ |
Current File : //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)