Data repositories class inherit from Singleton() which implements the pattern.

(close #7)

Data repositories class inherit from Singleton() which implements the pattern.
(close #7)
Tássia Camões Araújo
1 parent 7174d454
Showing 1 changed file with 7 additions and 3 deletions Show diff stats
src/data.py
@@ -45,9 +45,13 @@ def normalize_tags(string):
     """
     return string.replace(':','_').replace('-','\'')
  
-# FIXME Data repositories should be singleton
+class Singleton(object):
+    def __new__(cls, *args, **kwargs):
+        if '_inst' not in vars(cls):
+            cls._inst = object.__new__(cls)
+        return cls._inst
  
-class DebtagsDB(debtags.DB):
+class DebtagsDB(debtags.DB,Singleton):
     def __init__(self,path):
         self.path = path
  
@@ -72,7 +76,7 @@ class DebtagsDB(debtags.DB):
                                       relevance_index(b)))
         return normalize_tags(' '.join(sorted_relevant_tags[-qtd_of_tags:]))
  
-class DebtagsIndex(xapian.WritableDatabase):
+class DebtagsIndex(xapian.WritableDatabase,Singleton):
     def __init__(self,path):
         self.path = path
         self.db_md5 = 0
...	...	@@ -45,9 +45,13 @@ def normalize_tags(string):
45	45	"""
46	46	return string.replace(':','_').replace('-','\'')
47	47
48		-# FIXME Data repositories should be singleton
	48	+class Singleton(object):
	49	+ def __new__(cls, args, *kwargs):
	50	+ if '_inst' not in vars(cls):
	51	+ cls._inst = object.__new__(cls)
	52	+ return cls._inst
49	53
50		-class DebtagsDB(debtags.DB):
	54	+class DebtagsDB(debtags.DB,Singleton):
51	55	def __init__(self,path):
52	56	self.path = path
53	57
...	...	@@ -72,7 +76,7 @@ class DebtagsDB(debtags.DB):
72	76	relevance_index(b)))
73	77	return normalize_tags(' '.join(sorted_relevant_tags[-qtd_of_tags:]))
74	78
75		-class DebtagsIndex(xapian.WritableDatabase):
	79	+class DebtagsIndex(xapian.WritableDatabase,Singleton):
76	80	def __init__(self,path):
77	81	self.path = path
78	82	self.db_md5 = 0
...	...