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import threading
import zope.component
from zope.component import getGlobalSiteManager
from zope.component.interfaces import ComponentLookupError
from zope.component.interfaces import IComponentLookup
from zope.component.registry import Components
from zope.component import getSiteManager as original_getSiteManager
from zope.deferredimport import deprecated
from repoze.bfg.zcml import zcml_configure
deprecated(
"('from repoze.bfg.registry import Settings' is now "
"deprecated; instead use 'from repoze.bfg.settings import Settings')",
Settings = "repoze.bfg.settings:Settings",
)
deprecated(
"('from repoze.bfg.registry import get_options' is now "
"deprecated; instead use 'from repoze.bfg.settings import get_options')",
get_options = "repoze.bfg.settings:get_options",
)
class ThreadLocalRegistryManager(threading.local):
def __init__(self):
self.stack = []
def push(self, registry):
self.stack.append(registry)
set = push # backwards compatibility
def pop(self):
if self.stack:
return self.stack.pop()
def get(self):
try:
return self.stack[-1]
except IndexError:
return getGlobalSiteManager()
def clear(self):
self.stack[:] = []
registry_manager = ThreadLocalRegistryManager()
def setRegistryManager(manager): # for unit tests
global registry_manager
old_registry_manager = registry_manager
registry_manager = manager
return old_registry_manager
def makeRegistry(filename, package, lock=threading.Lock()):
""" We push our ZCML-defined configuration into an app-local
component registry in order to allow more than one bfg app to live
in the same process space without one unnecessarily stomping on
the other's component registrations (although I suspect directives
that have side effects are going to fail). The only way to do
that currently is to override zope.component.getGlobalSiteManager
for the duration of the ZCML includes. We acquire a lock in case
another make_app runs in a different thread simultaneously, in a
vain attempt to prevent mixing of registrations. There's not much
we can do about non-makeRegistry code that tries to use the global
site manager API directly in a different thread while we hold the
lock. Those registrations will end up in our application's
registry."""
lock.acquire()
registry = Components(package.__name__)
registry_manager.push(registry)
try:
original_getSiteManager.sethook(getSiteManager)
zope.component.getGlobalSiteManager = registry_manager.get
zcml_configure(filename, package=package)
return registry
finally:
zope.component.getGlobalSiteManager = getGlobalSiteManager
lock.release()
registry_manager.pop()
def getSiteManager(context=None):
if context is None:
return registry_manager.get()
else:
try:
return IComponentLookup(context)
except TypeError, error:
raise ComponentLookupError(*error.args)
from zope.testing.cleanup import addCleanUp
try:
addCleanUp(original_getSiteManager.reset)
except AttributeError:
# zope.hookable not yet installed
pass
addCleanUp(registry_manager.clear)
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