1 # -*- coding: utf-8 -*-
2 ##############################################################################
4 # OpenERP, Open Source Management Solution
5 # Copyright (C) 2004-2009 Tiny SPRL (<http://tiny.be>).
7 # This program is free software: you can redistribute it and/or modify
8 # it under the terms of the GNU Affero General Public License as
9 # published by the Free Software Foundation, either version 3 of the
10 # License, or (at your option) any later version.
12 # This program is distributed in the hope that it will be useful,
13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 # GNU Affero General Public License for more details.
17 # You should have received a copy of the GNU Affero General Public License
18 # along with this program. If not, see <http://www.gnu.org/licenses/>.
20 ##############################################################################
22 """ Models registries.
25 from collections import Mapping
26 from contextlib import contextmanager
31 import openerp.osv.orm
33 import openerp.modules.db
34 import openerp.tools.config
35 from openerp.tools import assertion_report
37 _logger = logging.getLogger(__name__)
39 class Registry(Mapping):
40 """ Model registry for a particular database.
42 The registry is essentially a mapping between model names and model
43 instances. There is one registry instance per database.
47 def __init__(self, db_name):
48 super(Registry, self).__init__()
49 self.models = {} # model name/model instance mapping
51 self._store_function = {}
53 self._init_parent = {}
54 self._assertion_report = assertion_report.assertion_report()
55 self.fields_by_model = None
57 # modules fully loaded (maintained during init phase by `loading` module)
58 self._init_modules = set()
60 self.db_name = db_name
61 self.db = openerp.sql_db.db_connect(db_name)
63 # Indicates that the registry is
66 # Inter-process signaling (used only when openerp.multi_process is True):
67 # The `base_registry_signaling` sequence indicates the whole registry
69 # The `base_cache_signaling sequence` indicates all caches must be
70 # invalidated (i.e. cleared).
71 self.base_registry_signaling_sequence = 1
72 self.base_cache_signaling_sequence = 1
74 # Flag indicating if at least one model cache has been cleared.
75 # Useful only in a multi-process context.
76 self._any_cache_cleared = False
79 has_unaccent = openerp.modules.db.has_unaccent(cr)
80 if openerp.tools.config['unaccent'] and not has_unaccent:
81 _logger.warning("The option --unaccent was given but no unaccent() function was found in database.")
82 self.has_unaccent = openerp.tools.config['unaccent'] and has_unaccent
86 # Mapping abstract methods implementation
87 # => mixin provides methods keys, items, values, get, __eq__, and __ne__
90 """ Return the size of the registry. """
91 return len(self.models)
94 """ Return an iterator over all model names. """
95 return iter(self.models)
97 def __contains__(self, model_name):
98 """ Test whether the model with the given name exists. """
99 return model_name in self.models
101 def __getitem__(self, model_name):
102 """ Return the model with the given name or raise KeyError if it doesn't exist."""
103 return self.models[model_name]
105 def do_parent_store(self, cr):
106 for o in self._init_parent:
107 self.get(o)._parent_store_compute(cr)
111 """ Return the list of model names in this registry."""
114 def add(self, model_name, model):
115 """ Add or replace a model in the registry."""
116 self.models[model_name] = model
118 def load(self, cr, module):
119 """ Load a given module in the registry.
121 At the Python level, the modules are already loaded, but not yet on a
122 per-registry level. This method populates a registry with the given
123 modules, i.e. it instanciates all the classes of a the given module
124 and registers them in the registry.
127 models_to_load = [] # need to preserve loading order
128 # Instantiate registered classes (via the MetaModel automatic discovery
129 # or via explicit constructor call), and add them to the pool.
130 for cls in openerp.osv.orm.MetaModel.module_to_models.get(module.name, []):
131 # models register themselves in self.models
132 model = cls.create_instance(self, cr)
133 if model._name not in models_to_load:
134 # avoid double-loading models whose declaration is split
135 models_to_load.append(model._name)
136 return [self.models[m] for m in models_to_load]
138 def clear_caches(self):
140 This clears the caches associated to methods decorated with
141 ``tools.ormcache`` or ``tools.ormcache_multi`` for all the models.
143 for model in self.models.itervalues():
145 # Special case for ir_ui_menu which does not use openerp.tools.ormcache.
146 ir_ui_menu = self.models.get('ir.ui.menu')
148 ir_ui_menu.clear_cache()
151 # Useful only in a multi-process context.
152 def reset_any_cache_cleared(self):
153 self._any_cache_cleared = False
155 # Useful only in a multi-process context.
156 def any_cache_cleared(self):
157 return self._any_cache_cleared
160 def setup_multi_process_signaling(cls, cr):
161 if not openerp.multi_process:
164 # Inter-process signaling:
165 # The `base_registry_signaling` sequence indicates the whole registry
167 # The `base_cache_signaling sequence` indicates all caches must be
168 # invalidated (i.e. cleared).
169 cr.execute("""SELECT sequence_name FROM information_schema.sequences WHERE sequence_name='base_registry_signaling'""")
170 if not cr.fetchall():
171 cr.execute("""CREATE SEQUENCE base_registry_signaling INCREMENT BY 1 START WITH 1""")
172 cr.execute("""SELECT nextval('base_registry_signaling')""")
173 cr.execute("""CREATE SEQUENCE base_cache_signaling INCREMENT BY 1 START WITH 1""")
174 cr.execute("""SELECT nextval('base_cache_signaling')""")
177 def cursor(self, auto_commit=True):
178 cr = self.db.cursor()
187 class RegistryManager(object):
188 """ Model registries manager.
190 The manager is responsible for creation and deletion of model
191 registries (essentially database connection/model registry pairs).
194 # Mapping between db name and model registry.
195 # Accessed through the methods below.
197 registries_lock = threading.RLock()
200 def get(cls, db_name, force_demo=False, status=None, update_module=False):
201 """ Return a registry for a given database name."""
203 return cls.registries[db_name]
205 return cls.new(db_name, force_demo, status,
208 # set db tracker - cleaned up at the WSGI
209 # dispatching phase in openerp.service.wsgi_server.application
210 threading.current_thread().dbname = db_name
213 def new(cls, db_name, force_demo=False, status=None,
214 update_module=False):
215 """ Create and return a new registry for a given database name.
217 The (possibly) previous registry for that database name is discarded.
220 import openerp.modules
221 with cls.registries_lock:
222 registry = Registry(db_name)
224 # Initializing a registry will call general code which will in turn
225 # call registries.get (this object) to obtain the registry being
226 # initialized. Make it available in the registries dictionary then
227 # remove it if an exception is raised.
229 cls.registries[db_name] = registry
231 # This should be a method on Registry
232 openerp.modules.load_modules(registry.db, force_demo, status, update_module)
234 del cls.registries[db_name]
237 # load_modules() above can replace the registry by calling
238 # indirectly new() again (when modules have to be uninstalled).
240 registry = cls.registries[db_name]
242 cr = registry.db.cursor()
244 Registry.setup_multi_process_signaling(cr)
245 registry.do_parent_store(cr)
250 registry.ready = True
253 # only in case of update, otherwise we'll have an infinite reload loop!
254 cls.signal_registry_change(db_name)
258 def delete(cls, db_name):
259 """Delete the registry linked to a given database. """
260 with cls.registries_lock:
261 if db_name in cls.registries:
262 cls.registries[db_name].clear_caches()
263 del cls.registries[db_name]
267 """Delete all the registries. """
268 with cls.registries_lock:
269 for db_name in cls.registries.keys():
273 def clear_caches(cls, db_name):
276 This clears the caches associated to methods decorated with
277 ``tools.ormcache`` or ``tools.ormcache_multi`` for all the models
278 of the given database name.
280 This method is given to spare you a ``RegistryManager.get(db_name)``
281 that would loads the given database if it was not already loaded.
283 with cls.registries_lock:
284 if db_name in cls.registries:
285 cls.registries[db_name].clear_caches()
288 def check_registry_signaling(cls, db_name):
290 Check if the modules have changed and performs all necessary operations to update
291 the registry of the corresponding database.
294 :returns: True if changes has been detected in the database and False otherwise.
297 if openerp.multi_process and db_name in cls.registries:
298 registry = cls.get(db_name)
299 cr = registry.db.cursor()
302 SELECT base_registry_signaling.last_value,
303 base_cache_signaling.last_value
304 FROM base_registry_signaling, base_cache_signaling""")
306 # Check if the model registry must be reloaded (e.g. after the
307 # database has been updated by another process).
308 if registry.base_registry_signaling_sequence > 1 and registry.base_registry_signaling_sequence != r:
310 _logger.info("Reloading the model registry after database signaling.")
311 registry = cls.new(db_name)
312 # Check if the model caches must be invalidated (e.g. after a write
313 # occured on another process). Don't clear right after a registry
315 elif registry.base_cache_signaling_sequence > 1 and registry.base_cache_signaling_sequence != c:
317 _logger.info("Invalidating all model caches after database signaling.")
318 registry.clear_caches()
319 registry.reset_any_cache_cleared()
320 # One possible reason caches have been invalidated is the
321 # use of decimal_precision.write(), in which case we need
322 # to refresh fields.float columns.
323 for model in registry.models.values():
324 for column in model._columns.values():
325 if hasattr(column, 'digits_change'):
326 column.digits_change(cr)
327 registry.base_registry_signaling_sequence = r
328 registry.base_cache_signaling_sequence = c
334 def signal_caches_change(cls, db_name):
335 if openerp.multi_process and db_name in cls.registries:
336 # Check the registries if any cache has been cleared and signal it
337 # through the database to other processes.
338 registry = cls.get(db_name)
339 if registry.any_cache_cleared():
340 _logger.info("At least one model cache has been cleared, signaling through the database.")
341 cr = registry.db.cursor()
344 cr.execute("select nextval('base_cache_signaling')")
348 registry.base_cache_signaling_sequence = r
349 registry.reset_any_cache_cleared()
352 def signal_registry_change(cls, db_name):
353 if openerp.multi_process and db_name in cls.registries:
354 registry = cls.get(db_name)
355 cr = registry.db.cursor()
358 cr.execute("select nextval('base_registry_signaling')")
362 registry.base_registry_signaling_sequence = r
364 # vim:expandtab:smartindent:tabstop=4:softtabstop=4:shiftwidth=4: