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# Copyright 2018 ke liang <lokyse@163.com>.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import abc
import threading
from .marker import BaseMarker
lock = threading.RLock()
class IMarkerFactory(object):
__metaclass__ = abc.ABCMeta
@abc.abstractmethod
def getMarker(self, marker_name=None):
raise NotImplementedError()
@abc.abstractmethod
def deleteMarker(self, marker_name=None):
raise NotImplementedError()
@abc.abstractmethod
def exist(self, marker_name=None):
raise NotImplementedError()
class MarkerFactory(IMarkerFactory):
_instance = None
_marker_map = {}
def __new__(cls, *args, **kwargs):
if cls._instance is None:
cls._instance = super(MarkerFactory, cls).__new__(cls)
return cls._instance
def getMarker(self, marker_name=None):
if marker_name is None:
raise ValueError("not empty")
lock.acquire()
marker = self._marker_map.get(marker_name, None)
if marker is None:
marker = BaseMarker(name=marker_name)
self._marker_map[marker_name] = marker
lock.release()
return marker
def deleteMarker(self, marker_name=None):
lock.acquire()
if self.exist(marker_name):
del self._marker_map[marker_name]
return True
lock.release()
return False
def exist(self, marker_name=None):
return self._marker_map.get(
marker_name, None) is not None
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