/usr/lib/python2.7/dist-packages/trytond/pool.py is in tryton-server 3.8.3-1.
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__
__all__ = ['Pool', 'PoolMeta', 'PoolBase', 'isregisteredby']
logger = logging.getLogger(__name__)
class PoolMeta(type):
def __new__(cls, name, bases, dct):
new = type.__new__(cls, name, bases, dct)
if '__name__' in dct:
try:
new.__name__ = dct['__name__']
except TypeError:
new.__name__ = dct['__name__'].encode('utf-8')
return new
class PoolBase(object):
__metaclass__ = PoolMeta
@classmethod
def __setup__(cls):
pass
@classmethod
def __post_setup__(cls):
pass
@classmethod
def __register__(cls, module_name):
pass
class Pool(object):
classes = {
'model': {},
'wizard': {},
'report': {},
}
_started = False
_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(*classes, **kwargs):
'''
Register a list of classes
'''
module = kwargs['module']
type_ = kwargs['type_']
assert type_ in ('model', 'report', 'wizard')
for cls in classes:
mpool = Pool.classes[type_].setdefault(module, [])
assert cls not in mpool, cls
assert issubclass(cls.__class__, PoolMeta), cls
mpool.append(cls)
@classmethod
def start(cls):
'''
Start/restart the Pool
'''
with cls._lock:
for classes in Pool.classes.itervalues():
classes.clear()
register_classes()
cls._started = True
@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
'''
with cls._lock:
databases = []
for database in cls._pool.keys():
if cls._locks.get(database):
if cls._locks[database].acquire(False):
databases.append(database)
cls._locks[database].release()
return databases
@property
def lock(self):
'''
Return the database lock for the pool.
'''
return self._locks[self.database_name]
def init(self, update=None, lang=None):
'''
Init pool
Set update to proceed to update
lang is a list of language code to be updated
'''
with self._lock:
if not self._started:
self.start()
with self._locks[self.database_name]:
# Don't reset pool if already init and not to update
if not update and self._pool.get(self.database_name):
return
logger.info('init pool for "%s"', 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,), {})
cls.__setup__()
self.add(cls, type)
return cls
raise
def add(self, cls, type='model'):
'''
Add a classe to the pool
'''
with self._locks[self.database_name]:
self._pool[self.database_name][type][cls.__name__] = cls
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 setup(self, module):
'''
Setup classes for module and return a list of classes for each type in
a dictionary.
'''
classes = {}
for type_ in self.classes.keys():
classes[type_] = []
for cls in self.classes[type_].get(module, []):
try:
previous_cls = self.get(cls.__name__, type=type_)
cls = type(cls.__name__, (cls, previous_cls), {})
except KeyError:
pass
if not issubclass(cls, PoolBase):
continue
cls.__setup__()
self.add(cls, type=type_)
classes[type_].append(cls)
for cls in classes[type_]:
cls.__post_setup__()
return classes
def isregisteredby(obj, module, type_='model'):
pool = Pool()
classes = pool.classes[type_]
return any(issubclass(obj, cls) for cls in classes.get(module, []))
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