Added autostore convenience type.

[didex.git] / didex / store.py

diff --git a/didex/store.py b/didex/store.py
index 450a9fe..fb5f2c6 100644 (file)
--- a/didex/store.py
+++ b/didex/store.py
@@ -83,16 +83,37 @@ class store(object):
         return id
 
     @txnfun(lambda self: self.db().env.env)
-    def unregister(self, id, *, tx):
+    def unregister(self, id, *, vfy=None, tx):
         obj = self.get(id)
+        if vfy is not None and obj is not vfy:
+            raise RuntimeError("object identity crisis: " + str(vfy) + " is not cached object " + obj)
         for nm, attr in storedescs(obj):
             attr.unregister(id, obj, tx)
         self.db().remove(id, tx=tx)
         self.cache.remove(id)
 
     @txnfun(lambda self: self.db().env.env)
-    def update(self, id, *, tx):
+    def update(self, id, *, vfy=None, tx):
         obj = self.get(id, load=False)
+        if vfy is not None and obj is not vfy:
+            raise RuntimeError("object identity crisis: " + str(vfy) + " is not cached object " + obj)
         for nm, attr, in storedescs(obj):
             attr.update(id, obj, tx)
         self.db().replace(id, self._encode(obj), tx=tx)
+
+class autotype(type):
+    def __call__(self, *args, **kwargs):
+        new = super().__call__(*args, **kwargs)
+        new.id = self.store.register(new)
+        return new
+
+class autostore(object, metaclass=autotype):
+    def __init__(self):
+        self.id = None
+
+    def save(self):
+        self.store.update(self.id, vfy=self)
+
+    def remove(self):
+        self.store.unregister(self.id, vfy=self)
+        self.id = None