66 lines
1.8 KiB
Python
66 lines
1.8 KiB
Python
"""
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.. module: lemur.common.managers
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:platform: Unix
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:copyright: (c) 2015 by Netflix Inc., see AUTHORS for more
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:license: Apache, see LICENSE for more details.
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.. moduleauthor:: Kevin Glisson <kglisson@netflix.com>
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"""
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from flask import current_app
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# inspired by https://github.com/getsentry/sentry
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class InstanceManager(object):
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def __init__(self, class_list=None, instances=True):
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if class_list is None:
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class_list = []
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self.instances = instances
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self.update(class_list)
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def get_class_list(self):
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return self.class_list
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def add(self, class_path):
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self.cache = None
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self.class_list.append(class_path)
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def remove(self, class_path):
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self.cache = None
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self.class_list.remove(class_path)
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def update(self, class_list):
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"""
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Updates the class list and wipes the cache.
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"""
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self.cache = None
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self.class_list = class_list
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def all(self):
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"""
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Returns a list of cached instances.
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"""
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class_list = list(self.get_class_list())
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if not class_list:
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self.cache = []
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return []
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if self.cache is not None:
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return self.cache
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results = []
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for cls_path in class_list:
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module_name, class_name = cls_path.rsplit('.', 1)
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try:
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module = __import__(module_name, {}, {}, class_name)
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cls = getattr(module, class_name)
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if self.instances:
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results.append(cls())
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else:
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results.append(cls)
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except Exception:
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current_app.logger.exception('Unable to import %s', cls_path)
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continue
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self.cache = results
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return results
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