1 files changed, 39 insertions, 0 deletions
diff --git a/repoze/bfg/threadlocal.py b/repoze/bfg/threadlocal.py
new file mode 100644
index 000000000..7df4f34f4
--- /dev/null
+++ b/repoze/bfg/threadlocal.py
@@ -0,0 +1,39 @@
+import threading
+from zope.component import getGlobalSiteManager
+
+class ThreadLocalManager(threading.local):
+    def __init__(self, default):
+        self.stack = []
+        self.default = default
+        
+    def push(self, info):
+        self.stack.append(info)
+
+    set = push # b/c
+
+    def pop(self):
+        if self.stack:
+            return self.stack.pop()
+
+    def get(self):
+        try:
+            return self.stack[-1]
+        except IndexError:
+            return self.default()
+
+    def clear(self):
+        self.stack[:] = []
+
+def defaults():
+    defaults = {'request':None}
+    gsm = getGlobalSiteManager()
+    defaults['registry'] = gsm
+    return defaults
+
+manager = ThreadLocalManager(defaults)
+
+def setManager(new_manager): # for unit tests
+    global manager
+    old_manager = manager
+    manager = new_manager
+    return old_manager