/usr/share/pyshared/trytond/pool.py is in tryton-server 2.2.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#this repository contains the full copyright notices and license terms.
from threading import RLock
import logging
from trytond.modules import load_modules, register_classes
from trytond.transaction import Transaction
import __builtin__
class Pool(object):
classes = {
'model': {},
'wizard': {},
'report': {},
}
_lock = RLock()
_locks = {}
_pool = {}
test = False
_instances = {}
def __new__(cls, database_name=None):
if database_name is None:
database_name = Transaction().cursor.database_name
result = cls._instances.get(database_name)
if result:
return result
lock = cls._locks.get(database_name)
if not lock:
with cls._lock:
lock = cls._locks.setdefault(database_name, RLock())
with lock:
return cls._instances.setdefault(database_name,
super(Pool, cls).__new__(cls))
def __init__(self, database_name=None):
if database_name is None:
database_name = Transaction().cursor.database_name
self.database_name = database_name
@staticmethod
def register(klass, type='model'):
'''
Register a class
:param klass: the class
:param type: the type
'''
module = None
for module in klass.__module__.split('.'):
if module != 'trytond' and module != 'modules':
break
if module:
Pool.classes[type].setdefault(module, []).append(klass)
@classmethod
def start(cls):
'''
Start/restart the Pool
'''
with cls._lock:
reload_p = False
prev_classes = {}
for type in cls.classes:
if cls.classes.get(type):
reload_p = True
prev_classes[type] = cls.classes.get(type)
cls.classes[type] = {}
try:
register_classes(reload_p=reload_p)
except Exception:
if not reload_p:
raise
for type in prev_classes:
cls.classes[type] = prev_classes[type]
for db_name in cls.database_list():
cls(db_name).init()
@classmethod
def stop(cls, database_name):
'''
Stop the Pool
'''
with cls._lock:
if database_name in cls._instances:
del cls._instances[database_name]
lock = cls._locks.get(database_name)
if not lock:
return
with lock:
if database_name in cls._pool:
del cls._pool[database_name]
@classmethod
def database_list(cls):
'''
:return: database list
'''
return cls._pool.keys()
def init(self, update=False, lang=None):
'''
Init pool
:param database_name: the database name
:param update: a boolean to proceed to update
:param lang: a list of language code to be updated
'''
logger = logging.getLogger('pool')
logger.info('init pool for "%s"' % self.database_name)
with self._locks[self.database_name]:
self._pool.setdefault(self.database_name, {})
#Clean the _pool before loading modules
for type in self.classes.keys():
self._pool[self.database_name][type] = {}
restart = not load_modules(self.database_name, self, update=update,
lang=lang)
if restart:
self.init()
def get(self, name, type='model'):
'''
Get an object from the pool
:param name: the object name
:param type: the type
:return: the instance
'''
if type == '*':
for type in self.classes.keys():
if name in self._pool[self.database_name][type]:
break
try:
return self._pool[self.database_name][type][name]
except KeyError:
if type == 'report':
from trytond.report import Report
# Keyword argument 'type' conflicts with builtin function
cls = __builtin__.type(str(name), (Report,), {})
obj = object.__new__(cls)
obj._name = name
self.add(obj, type)
obj.__init__()
return obj
raise
def add(self, obj, type='model'):
'''
Add an object to the pool
:param obj: the object
:param type: the type
'''
with self._locks[self.database_name]:
self._pool[self.database_name][type][obj._name] = obj
def object_name_list(self, type='model'):
'''
Return the object name list of a type
:param type: the type
:return: a list of name
'''
if type == '*':
res = []
for type in self.classes.keys():
res += self._pool[self.database_name][type].keys()
return res
return self._pool[self.database_name][type].keys()
def iterobject(self, type='model'):
'''
Return an iterator over object name, object
:param type: the type
:return: an iterator
'''
return self._pool[self.database_name][type].iteritems()
def instanciate(self, module):
'''
Instanciate objects for a module
:param: the module name
:return: a dictionary with each type as key
and a list of object as value
'''
res = {}
for _type in self.classes.keys():
res[_type] = []
for cls in self.classes[_type].get(module, []):
if cls._name in self._pool[self.database_name][_type].keys():
parent_cls = self.get(cls._name, type=_type).__class__
cls = type(cls._name, (cls, parent_cls), {})
obj = object.__new__(cls)
self.add(obj, type=_type)
obj.__init__()
res[_type].append(obj)
return res
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