free not limited to threaded modules. modified the modules dependencies management.

src/appengine/__init__.py

@@ -48,6 +48,8 @@ class AppEngineException(Exception):
     def __init__(self, error: AEErrs, mesg=None) -> None:
         if mesg is None:
             self.mesg = str(error)
+        else:
+            self.mesg = mesg
         super().__init__(self.mesg)
         self.value = error.value
 
@@ -105,8 +107,8 @@ class Commands(Thread):
         self.stopped = True
 
     def free(self):
-        """ Virtual method used to clean resources for threaded Commands
+        """ Virtual method used to clean resources for all Commands
-        when they are stopped.
+        when the application is exited.
         """
         pass
 
@@ -297,9 +299,15 @@ class CommandsLoader:
     def _load_dependencies(self):
         for k, v in self.cmods.items():
             if hasattr(v, "dependencies"):
-                for p in v.dependencies:
+                deps = v.dependencies
-                    if p in self.cmods.keys():
+                # dependencies can be a list or dictionary
-                        setattr(v, p, self.cmods[p])
+                if isinstance(v.dependencies, list):
+                    deps = {}
+                    for d in v.dependencies:
+                        deps[d] = d
+                for p, pv in deps.items():
+                    if pv in self.cmods.keys():
+                        setattr(v, p, self.cmods[pv])
                     else:
                         self.log.error(
                             'Dependency "{}" of module "{}" could not be satisfied'.format(
@@ -325,8 +333,7 @@ class CommandsLoader:
 
     def free(self):
         for k, v in self.cmods.items():
-            if v.threaded:
+            v.free()
-                v.free()
 
 
 class AppEngine: