# by the Factory, you need to restart your python instance / web server
# as the cached information then becomes wrong
+from PLC.Debug import log
+
from PLC.TagTypes import TagTypes, TagType
from PLC.Roles import Roles, Role
self.api=api
# 'tagname'=>'tag_id'
self.cache={}
+ self.hash_name_to_role=dict ( [ (role['name'],role) for role in Roles(api)] )
def has_cache (self,tagname): return self.cache.has_key(tagname)
def get_cache (self,tagname): return self.cache[tagname]
def set_cache (self,tagname,tag_type): self.cache[tagname]=tag_type
- def locate_or_create_tag (self, tagname, category, description, roles):
+ def locate_or_create_tag (self, tagname, category, description, roles, enforce=False):
"search tag type from tagname & create if needed"
# cached ?
tag_types = TagTypes (self.api, {'tagname':tagname})
if tag_types:
tag_type = tag_types[0]
+ # enforce should only be set by the 'service plc start accessors' sequence
+ if enforce:
+ try:
+ tag_type.update({'category':category,'description':description})
+ tag_type.sync()
+ roles_to_add = set(roles).difference(set(tag_type['roles']))
+ for rolename in roles_to_add:
+ tag_type.add_role(self.hash_name_to_role[rolename])
+ roles_to_delete = set(tag_type['roles']).difference(set(roles))
+ for rolename in roles_to_delete:
+ tag_type.remove_role(self.hash_name_to_role[rolename])
+ except:
+ # this goes in boot.log ...
+ print >> log, "WARNING, Could not enforce tag type, tagname=%s\n"%tagname
+ traceback.print_exc(file=log)
+
else:
# not found: create it
tag_type_fields = {'tagname':tagname,
# this is designed to be part of the 'service plc start' sequence
# it ensures the creation of all the tagtypes defined
- # in the various accessors
+ # in the various accessors, and enforces consistency to the DB
# it's not easy to have define_accessors do this because at
# load-time as we do not have an instance of API yet
def run_all_tag_locators (self):
for (name, tag_locator) in Accessor.tag_locators.items():
- tag_locator(self)
+ tag_locator(self,enforce=True)
####################
# make it a singleton so we can cache stuff in there over time