aacc56a4e2
Re-enable the CPU utilization module as proof-of-concept for the new core engine. see #23
67 lines
2 KiB
Python
67 lines
2 KiB
Python
"""Core application engine"""
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import time
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import importlib
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import bumblebee.error
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class Module(object):
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"""Module instance base class
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Objects of this type represent the modules that
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the user configures. Concrete module implementations
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(e.g. CPU utilization, disk usage, etc.) derive from
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this base class.
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"""
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def __init__(self, engine):
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pass
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class Engine(object):
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"""Engine for driving the application
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This class connects input/output, instantiates all
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required modules and drives the "event loop"
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"""
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def __init__(self, config, output=None):
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self._output = output
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self._running = True
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self._modules = []
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self.load_modules(config.modules())
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def load_modules(self, modules):
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"""Load specified modules and return them as list"""
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for module in modules:
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self._modules.append(self.load_module(module["module"]))
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return self._modules
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def load_module(self, module_name):
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"""Load specified module and return it as object"""
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try:
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module = importlib.import_module("bumblebee.modules.{}".format(module_name))
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except ImportError as error:
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raise bumblebee.error.ModuleLoadError(error)
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return getattr(module, "Module")(self)
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def running(self):
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"""Check whether the event loop is running"""
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return self._running
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def stop(self):
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"""Stop the event loop"""
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self._running = False
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def run(self):
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"""Start the event loop"""
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self._output.start()
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while self.running():
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widgets = []
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for module in self._modules:
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module_widgets = module.widgets()
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widgets += module_widgets if isinstance(module_widgets, list) else [module_widgets]
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self._output.draw(widgets=widgets, engine=self)
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self._output.flush()
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if self.running():
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time.sleep(1)
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self._output.stop()
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# vim: tabstop=8 expandtab shiftwidth=4 softtabstop=4
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