"""
Threading utilities for parallel calculations.
"""
#!/usr/bin/env python
# -*- coding: utf-8 -*-
# ----------------------------------------------------------------------- #
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# DO NOT TOUCH THIS CODE -- BEGIN
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import threading
[docs]def synchronized_method(method):
outer_lock = threading.Lock()
lock_name = "__"+method.__name__+"_lock"+"__"
def sync_method(self, *args, **kws):
with outer_lock:
if not hasattr(self, lock_name): setattr(self, lock_name, threading.Lock())
lock = getattr(self, lock_name)
with lock:
return method(self, *args, **kws)
return sync_method
[docs]class Singleton:
def __init__(self, decorated):
self._decorated = decorated
[docs] @synchronized_method
def Instance(self):
try:
return self._instance
except AttributeError:
self._instance = self._decorated()
return self._instance
def __call__(self):
raise TypeError('Singletons must be accessed through `Instance()`.')
def __instancecheck__(self, inst):
return isinstance(inst, self._decorated)
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# DO NOT TOUCH THIS CODE -- END
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