Add class method to detect setting changes

Signed-off-by: Roberto Rosario <Roberto.Rosario@mayan-edms.com>

mayan/apps/smart_settings/classes.py

@@ -1,6 +1,7 @@
 from __future__ import unicode_literals
 
 import errno
+import hashlib
 from importlib import import_module
 import logging
 import os
@@ -78,6 +79,7 @@ class Namespace(object):
 @python_2_unicode_compatible
 class Setting(object):
     _registry = {}
+    _cache_hash = None
 
     @staticmethod
     def deserialize_value(value):
@@ -108,6 +110,15 @@ class Setting(object):
 
         return result
 
+    @classmethod
+    def check_changed(cls):
+        if not cls._cache_hash:
+            cls._cache_hash = cls.get_hash()
+
+        print("!!!@@", cls._cache_hash, cls.get_hash())
+
+        return cls._cache_hash != cls.get_hash()
+
     @classmethod
     def dump_data(cls, filter_term=None, namespace=None):
         dictionary = {}
@@ -129,6 +140,12 @@ class Setting(object):
     def get_all(cls):
         return sorted(cls._registry.values(), key=lambda x: x.global_name)
 
+    @classmethod
+    def get_hash(cls):
+        return force_text(
+            hashlib.sha256(cls.dump_data()).hexdigest()
+        )
+
     @classmethod
     def save_configuration(cls, path=settings.CONFIGURATION_FILEPATH):
         try: