83 lines
2.5 KiB
Python
83 lines
2.5 KiB
Python
# -*- coding: utf-8 -*-
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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"""Meter storage"""
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from __future__ import unicode_literals
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from collections import defaultdict
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import six
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import threading
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from collectd_ceilometer.common.meters.base import Meter
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from collectd_ceilometer.common.meters.libvirt import LibvirtMeter
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class MeterStorage(object):
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"""Meter storage"""
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# all plugins
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_classes = {
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'libvirt': LibvirtMeter,
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}
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def __init__(self, collectd):
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self._meters = {}
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self._default = Meter(collectd=collectd)
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# fill dict with specialized meters classes
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self._meters = {key: meter_class(collectd=collectd)
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for key, meter_class in six.iteritems(self._classes)}
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def get(self, plugin):
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"""Get meter for the collectd plugin"""
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# return specialized meter class for collectd plugin or default Meter
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return self._meters.get(plugin, self._default)
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class SampleContainer(object):
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"""Temporary storage for collectd samples"""
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def __init__(self):
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self._lock = threading.Lock()
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self._data = defaultdict(list)
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def add(self, key, samples, limit):
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"""Store list of samples under the key
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Store the list of samples under the given key. If the number of stored
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samples is greater than the given limit, all the samples are returned
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and the stored samples are dropped. Otherwise None is returned.
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@param key key of the samples
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@param samples list of samples
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@param limit sample list limit
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"""
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with self._lock:
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current = self._data[key]
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current += samples
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if len(current) >= limit:
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self._data[key] = []
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return current
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return None
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def reset(self):
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"""Reset stored samples
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Returns all samples and removes them from the container.
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"""
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with self._lock:
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retval = self._data
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self._data = defaultdict(list)
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return retval
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