<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def cache(self, dependency: Dependency, value):
 """ Store an instance of dependency in the cache. Does nothing if dependency is NOT a threadlocal or a singleton. :param dependency: The ``Dependency`` to cache :param value: The value to cache for dependency :type dependency: Dependency """

        if dependency.threadlocal:
            setattr(self._local, dependency.name, value)
        elif dependency.singleton:
            self._singleton[dependency.name] = value