New resource pool base

Author: einarf

demosys/resources/base.py

@@ -10,12 +10,53 @@ class BaseRegistry:
     """
 
     def __init__(self):
-        self._on_loaded_funcs = []
+        self.file_map = {}
+        self.file_meta = {}
 
-    def on_loaded(self, func):
-        """Register functions to call when all data is loaded"""
-        self._on_loaded_funcs.append(func)
+    @property
+    def count(self):
+        return len(self.file_map)
 
-    def _on_loaded(self):
-        for func in self._on_loaded_funcs:
-            func()
+    def load(self, path, **kwargs):
+        """Loads a resource or return existing one"""
+        raise NotImplementedError()
+
+    def load_deferred(self, path, **kwargs):
+        """Register a resource for deferred loading"""
+        raise NotImplementedError()
+
+    def load_pool(self):
+        """Load all resource in the pool"""
+        raise NotImplementedError()
+
+    def delete(self, obj, destroy=False):
+        """
+        Remove an object from the pool.
+        This only removes the reference and will not actually destroy the object itself
+        """
+        for path, data in self.file_map.items():
+            if data == obj:
+                del self.file_map[path]
+                del self.file_meta[path]
+                if destroy:
+                    self._destroy(obj)
+                break
+
+    def _destroy(self, obj):
+        """Destroys the object"""
+        raise NotImplementedError()
+
+    def flush(self, destroy=False):
+        """Delete all resources"""
+        for obj in list(self.file_map.values()):
+            self.delete(obj, destroy=destroy)
+
+    def _find_last_of(self, file_path, finders):
+        """Find the last occurance of the file in finders"""
+        found_path = None
+        for finder in finders:
+            path = finder.find(file_path)
+            if path:
+                found_path = path
+
+        return found_path