Revert "Drop: use of old persistent state classes"

This reverts commit 8344a860d226d8a5172bcb2e9de5946717a950ca.

1 files changed, 60 insertions, 1 deletions

diff --git a/ick2/persistent.py b/ick2/persistent.py
index 33903fe..e225b88 100644
--- a/ick2/persistent.py
+++ b/ick2/persistent.py
@@ -25,7 +25,66 @@ import yaml
 import ick2
 
 
-class NotFound(Exception):  # pragma: no cover
+class PersistentStateInterface:  # pragma: no cover
+
+    def get_resource_names(self, token, kind):
+        raise NotImplementedError()
+
+    def has_resource(self, token, kind, name):
+        raise NotImplementedError()
+
+    def get_resource(self, token, kind, name):
+        raise NotImplementedError()
+
+    def get_resources(self, token, kind):
+        return [
+            self.get_resource(token, kind, name)
+            for name in self.get_resource_names(token, kind)
+        ]
+
+    def write_resource(self, token, kind, name, resource):
+        raise NotImplementedError()
+
+    def update_resource(self, token, kind, name, resource):
+        raise NotImplementedError()
+
+    def remove_resource(self, token, kind, name):
+        raise NotImplementedError()
+
+
+class MemoryPersistentState(PersistentStateInterface):
+
+    def __init__(self):
+        self._res = {}
+
+    def get_resource_names(self, token, kind):
+        if kind not in self._res:
+            return []
+        return list(self._res[kind].keys())
+
+    def has_resource(self, token, kind, name):
+        return kind in self._res and name in self._res[kind]
+
+    def get_resource(self, token, kind, name):
+        if kind not in self._res or name not in self._res[kind]:
+            raise ick2.NotFound(kind=kind, name=name)
+        return self._res[kind][name]
+
+    def write_resource(self, token, kind, name, resource):
+        if kind not in self._res:
+            self._res[kind] = {}
+        self._res[kind][name] = resource
+
+    def update_resource(self, token, kind, name, resource):
+        self.write_resource(token, kind, name, resource)
+
+    def remove_resource(self, token, kind, name):
+        if kind not in self._res or name not in self._res[kind]:
+            raise ick2.NotFound(kind=kind, name=name)
+        del self._res[kind][name]
+
+
+class NotFound(Exception):
 
     def __init__(self, kind, name):
         super().__init__(