diff --git a/README.md b/README.md
index 6c455c1..38df944 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,7 @@
 # py-squid-blacklists
 Squid helper handling squidguard blacklists written in python
 
-* Only supports domains blacklists actually (ie : google.com, www.google.com, api.google.com, etc.)
+* Only supports domains blacklists actually (ie : google.com, www.google.com, mail.google.com, etc.)
 * In config specified blacklists are loaded in RAM or CDB backend using https://github.com/acg/python-cdb (testing flavour is available)
 * Usable as an external acl plugin of squid
 * Written because of poor developpement on squidguard and bad support of blacklists files using squid3
@@ -20,23 +20,25 @@ http_access deny urlblacklist
 
 config.py file must be include following statements
 ```
-blacklists_fetch = "http://dsi.ut-capitole.fr/blacklists/download/blacklists.tar.gz"
-blacklists_dir = "/usr/local/py-squid-blacklists/blacklists/"
-blacklists = ["adult","malware"]
+url = "http://dsi.ut-capitole.fr/blacklists/download/blacklists.tar.gz"
+base_dir = "/usr/local/py-squid-blacklists/blacklists/"
+categories = ["adult","malware"]
+db_backend = "ram"
 ```
 
-* blacklists_fetch : squidguard-like blacklists files, this variable is not already usable
-* blacklists_dir : path containing blacklists files
-* blacklists : blacklists to use for filtering
+* url : squidguard-like blacklists files, this variable is not already usable
+* categories : blacklists to use for filtering
+* base_dir : path containing blacklists files
+* db_backend : database flavour (ram|cdb)
 
 ## TODO
 
-* Auto-fetcher using blacklists_fetch if blacklists are not already downloaded or stored on the squid machine
+* Auto-fetcher using url if blacklists are not already downloaded or stored on the squid machine
 * Compatibility with python3 only
 * Filters for regex urls
 * Reduce memory footprint (wip with CDB backend alternative)
 * Code optimisation (wip)
-* Object oriented programming
+* Object oriented programming (wip)
 * Tests (wip)
 * ...
 
diff --git a/config.py.sample b/config.py.sample
index 6bb9d6d..984ca7e 100644
--- a/config.py.sample
+++ b/config.py.sample
@@ -1,3 +1,11 @@
-blacklists_fetch = "http://dsi.ut-capitole.fr/blacklists/download/blacklists.tar.gz"
-blacklists_dir = "/usr/local/py-squid-blacklists/blacklists/"
-blacklists = ["adult","malware"]
+# url to retrieve blacklists
+url = "http://dsi.ut-capitole.fr/blacklists/download/blacklists.tar.gz"
+
+# categories
+categories = ["adult","malware"]
+
+# base directory for blacklists
+base_dir = "/usr/local/py-squid-blacklists/blacklists/"
+
+# ram | cdb
+db_backend = "cdb"
\ No newline at end of file
diff --git a/py-squid-blacklists-cdb.py b/py-squid-blacklists-cdb.py
index 05c7350..2c4f94d 100755
--- a/py-squid-blacklists-cdb.py
+++ b/py-squid-blacklists-cdb.py
@@ -3,7 +3,6 @@
 import sys
 import os
 import re
-import urllib
 from urlparse import urlparse
 
 try:
diff --git a/py-squid-blacklists.py b/py-squid-blacklists.py
index e2826fb..3213220 100755
--- a/py-squid-blacklists.py
+++ b/py-squid-blacklists.py
@@ -3,7 +3,6 @@
 import sys
 import os
 import re
-import urllib
 from urlparse import urlparse
 
 try:
@@ -11,62 +10,81 @@ try:
 except ImportError:
     print("Please create config.py using config.py.sample")
     exit()
+try:
+    import cdb
+except ImportError:
+    print("Please install python-cdb from pypi or via package manager")
+    exit()
 
 
-def make_list(files):
-    blacklists = []
-    for l in files:
-        splitlist = l.split("/")
-        list_type = splitlist[len(splitlist) - 2]
-        blacklists.append([list_type, l])
-    return blacklists
+class PySquidBlacklists:
+    def __init__(self, config):
+        self.db_backend = config.db_backend
+        self.blacklist_categories = config.categories
+        self.domain_files = [os.path.join(dp, f) for dp, dn, fn in os.walk(os.path.expanduser(config.base_dir)) for f in
+                             fn if re.match(r"domains*", f)]
+        self.blacklist_files = self.make_list()
+        self.blacklist_cache = self.make_db()
+
+    def make_list(self):
+        blacklists = []
+        for l in self.domain_files:
+            splitlist = l.split("/")
+            list_type = splitlist[len(splitlist) - 2]
+            blacklists.append([list_type, l])
+        return blacklists
+
+    def make_db(self):
+        lib = dict()
+        for bls in self.blacklist_files:
+            if bls[0] in self.blacklist_categories:
+                cache = dict()
+                f = open(bls[1], "r")
+                for l in f:
+                    cache[l.strip("\n")] = True
+                lib[bls[0]] = cache
+                del cache
+        return lib
+
+    @property
+    def initialize():
+        return True
+
+    def compare(self, outline):
+        result = False
+        for blacklist in self.blacklist_cache:
+            tmpline = outline
+            while not result and tmpline != "":
+                try:
+                    result = self.blacklist_cache[blacklist][tmpline]
+                    pass
+                except KeyError:
+                    pass
+                tmpline = tmpline.partition('.')[2]
+        return result
+
+    @staticmethod
+    def response(r):
+        sys.stdout.write("%s\n" % r)
+        sys.stdout.flush()
 
 
-def make_db(blacklist_files, config):
-    lib = dict()
-    for bl in blacklist_files:
-        if (bl[0] in config.blacklists):
-            cache = dict()
-            f = open(bl[1], "r")
-            for line in f:
-                cache[line.strip("\n")] = True
-            lib[bl[0]] = cache
-            del cache
-    return lib
+class PySquidBlacklistsImporter:
+    def __init__(self, conf):
+        self.test = True
+        self.db = conf.db_backend
 
 
-def compare(outline, blacklist_cache):
-    result = False
-    for blacklist in blacklist_cache:
-        tmpline = outline
-        while not result and tmpline != "":
-            try:
-                result = blacklist_cache[blacklist][tmpline]
-                pass
-            except KeyError:
-                pass
-            tmpline = tmpline.partition('.')[2]
-    return result
-
-
-def squid_response(response):
-    sys.stdout.write("%s\n" % response)
-    sys.stdout.flush()
-
-
-domain_files = [os.path.join(dp, f) for dp, dn, fn in os.walk(os.path.expanduser(config.blacklists_dir)) for f in fn if re.match(r"domains*", f)]
-
-blacklist_files = make_list(domain_files)
-blacklist_cache = make_db(blacklist_files, config)
-
+bli = PySquidBlacklistsImporter(config)
+bl = PySquidBlacklists(config)
 while True:
     try:
-     line = sys.stdin.readline().strip()
-     outline = urlparse(line).netloc
-     if line:
-         if compare(outline, blacklist_cache):
-             squid_response("OK")
-         else:
-             squid_response("ERR")
+        line = sys.stdin.readline().strip()
+        outline = urlparse(line).netloc
+        if line:
+            if bl.compare(outline):
+                bl.response("OK")
+            else:
+                bl.response("ERR")
     except KeyboardInterrupt:
         break