pull from 2.0 trunk @ a433358bbcf4e8a771b80cae34468409ed5a811d

1 files changed, 23 insertions, 0 deletions

diff --git a/cloudinit/registry.py b/cloudinit/registry.py
new file mode 100644
index 00000000..46cf0585
--- /dev/null
+++ b/cloudinit/registry.py
@@ -0,0 +1,23 @@
+import copy
+
+
+class DictRegistry(object):
+    """A simple registry for a mapping of objects."""
+
+    def __init__(self):
+        self._items = {}
+
+    def register_item(self, key, item):
+        """Add item to the registry."""
+        if key in self._items:
+            raise ValueError(
+                'Item already registered with key {0}'.format(key))
+        self._items[key] = item
+
+    @property
+    def registered_items(self):
+        """All the items that have been registered.
+
+        This cannot be used to modify the contents of the registry.
+        """
+        return copy.copy(self._items)