Andal.LND/edx-platform
6
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Cache loaded plugins in memory

Browse Source
This commit is contained in:
Calen Pennington
2012-06-29 13:58:07 -04:00
parent 520fac1aa2
commit f859457037
1 changed files with 20 additions and 12 deletions
Download Patch File Download Diff File Expand all files Collapse all files

32
common/lib/xmodule/x_module.py
View File

@@ -23,6 +23,9 @@ class Plugin(object):
entry_point: The name of the entry point to load plugins from
"""
_plugin_cache = None
@classmethod
def load_class(cls, identifier, default=None):
"""
@@ -33,20 +36,25 @@ class Plugin(object):
If default is not None, will return default if no entry_point matching identifier
is found. Otherwise, will raise a ModuleMissingError
"""
identifier = identifier.lower()
classes = list(pkg_resources.iter_entry_points(cls.entry_point, name=identifier))
if len(classes) > 1:
log.warning("Found multiple classes for {entry_point} with identifier {id}: {classes}. Returning the first one.".format(
entry_point=cls.entry_point,
id=identifier,
classes=", ".join(class_.module_name for class_ in classes)))
if cls._plugin_cache is None:
cls._plugin_cache = {}
if len(classes) == 0:
if default is not None:
return default
raise ModuleMissingError(identifier)
if identifier not in cls._plugin_cache:
identifier = identifier.lower()
classes = list(pkg_resources.iter_entry_points(cls.entry_point, name=identifier))
if len(classes) > 1:
log.warning("Found multiple classes for {entry_point} with identifier {id}: {classes}. Returning the first one.".format(
entry_point=cls.entry_point,
id=identifier,
classes=", ".join(class_.module_name for class_ in classes)))
return classes[0].load()
if len(classes) == 0:
if default is not None:
return default
raise ModuleMissingError(identifier)
cls._plugin_cache[identifier] = classes[0].load()
return cls._plugin_cache[identifier]
@classmethod
def load_classes(cls):