Attachment #7520 for bug #40827

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class AppManager(object):
	_locale = None
	_cache = []
	_package_manager = None
	_pickle_file = os.path.join(CACHE_DIR, '.apps.%(locale)s.pkl')


	@classmethod
	def _invalidate_pickle_cache(cls):
		if cls._pickle_file:
			pickle_pattern = re.sub(r'%\(.*?\).', '*', cls._pickle_file)
			for pickle_file in glob(pickle_pattern):
				try:
					os.unlink(pickle_file)
				except OSError:
					pass

	@classmethod
	def _get_pickle_cache_file(cls):
		if cls._pickle_file:
			return cls._pickle_file % {'locale': cls._locale}

	@classmethod
	def _save_pickle_cache(cls, cache):
		pickle_file = cls._get_pickle_cache_file()
		if pickle_file:
			try:
				with open(pickle_file, 'wb') as fd:
					dump(cache, fd, 2)
			except (IOError, PickleError):
				return False
			else:
				return True

	@classmethod
	def _load_pickle_cache(cls):
		pickle_file = cls._get_pickle_cache_file()
		if pickle_file:
			try:
				with open(pickle_file, 'rb') as fd:
					return load(fd)
			except (IOError, PickleError):
				return None

	@classmethod
	def _relevant_ini_files(cls):
		return glob(os.path.join(CACHE_DIR, '*.ini'))

	@classmethod
	def _build_app_from_ini(cls, ini):
		return cls._AppClass.from_ini(ini, locale=cls._locale)

	@classmethod
	def clear_cache(cls):
		ucr_load()
		cls._cache[:] = []

	@classmethod
	def _get_every_single_app(cls):
		if not cls._cache:
			cls._locale = get_locale() or 'en'
			pickle_file = cls._pickle_file % {'locale': locale}
			try:
				cached_apps = cls._load_pickle_cache()
				if cached_apps is not None:
					cls._cache = cached_apps
					app_logger.debug('Loaded %d apps from cache' % len(cls._cache))
					app = cls._AppClass.from_ini(ini, locale=locale)
					if app is not None:
						cls._cache.append(app)
				cls._cache.sort()
				try:
					with open(pickle_file, 'wb') as fd:
						dump(cls._cache, fd, 2)
				except (IOError, PickleError):
					app_logger.warn('Unable to cache apps')
				else:
					for ini in cls._relevant_ini_files():
						app = cls._build_app_from_ini(ini)
						if app is not None:
							cls._cache.append(app)
					cls._cache.sort()
					if cls._save_pickle_cache(cls._cache):
						app_logger.debug('Saved %d apps into cache' % len(cls._cache))
					else:
						app_logger.warn('Unable to cache apps')
			finally:
				cls._locale = None
		return cls._cache

	@classmethod

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