[FIX] registry: another pass of cleanup for registry signaling

Some important points to consider:
 - signaling should be done after any schema alteration (including module [un]installation),
   service registration (e.g. reports)
 - the changes need to be committed to the database *before* signaling, otherwise an
   obvious race condition occurs during reload by other workers
 - any call to restart_pool() must be considered a possible candidate for
   signaling, and the 2 above conditions must be checked

The number of explicit calls was reduced by forcing the signaling at the end of
Registry.new() in case `update_module` was passed as True. In that situation
we always want to signal the changes - so all the redundant signaling calls
can be centralized. We can also assume that the relevant changes have already
been committed at that point, otherwise the registry update would not
have worked in the first place.
This means that there is no need for explicit signaling anymore everytime
`restart_pool` is called with `update_module=True`.

Some missing cr.commit() and explicit signaling calls were added or
moved to the right place. As a reminder: signaling must be done
*after* committing the changes, and usually *after* reloading the
registry on the current worker.

bzr revid: odo@openerp.com-20130301143203-e2csf5pkllwhmwqs

openerp/addons/base/ir/ir_model.py

@@ -169,7 +169,9 @@ class ir_model(osv.osv):
         if not context.get(MODULE_UNINSTALL_FLAG):
             # only reload pool for normal unlink. For module uninstall the
             # reload is done independently in openerp.modules.loading
+            cr.commit() # must be committed before reloading registry in new cursor
             pooler.restart_pool(cr.dbname)
+            openerp.modules.registry.RegistryManager.signal_registry_change(cr.dbname)
 
         return res
 
@@ -307,7 +309,6 @@ class ir_model_fields(osv.osv):
             if column_name and (result and result[0] == 'r'):
                 cr.execute('ALTER table "%s" DROP column "%s" cascade' % (model._table, field.name))
             model._columns.pop(field.name, None)
-            openerp.modules.registry.RegistryManager.signal_registry_change(cr.dbname)
         return True
 
     def unlink(self, cr, user, ids, context=None):
@@ -321,6 +322,9 @@ class ir_model_fields(osv.osv):
 
         self._drop_column(cr, user, ids, context)
         res = super(ir_model_fields, self).unlink(cr, user, ids, context)
+        if not context.get(MODULE_UNINSTALL_FLAG):
+            cr.commit()
+            openerp.modules.registry.RegistryManager.signal_registry_change(cr.dbname)
         return res
 
     def create(self, cr, user, vals, context=None):
@@ -469,7 +473,7 @@ class ir_model_fields(osv.osv):
                 for col_name, col_prop, val in patch_struct[1]:
                     setattr(obj._columns[col_name], col_prop, val)
                 obj._auto_init(cr, ctx)
-                openerp.modules.registry.RegistryManager.signal_registry_change(cr.dbname)
+            openerp.modules.registry.RegistryManager.signal_registry_change(cr.dbname)
         return res
 
 class ir_model_constraint(Model):

openerp/addons/base/module/module.py

@@ -411,7 +411,6 @@ class module(osv.osv):
         if to_install_ids:
             self.button_install(cr, uid, to_install_ids, context=context)
 
-        openerp.modules.registry.RegistryManager.signal_registry_change(cr.dbname)
         return dict(ACTION_DICT, name=_('Install'))
 
     def button_immediate_install(self, cr, uid, ids, context=None):
@@ -500,7 +499,6 @@ class module(osv.osv):
             raise orm.except_orm(_('Error'), _("The `base` module cannot be uninstalled"))
         dep_ids = self.downstream_dependencies(cr, uid, ids, context=context)
         self.write(cr, uid, ids + dep_ids, {'state': 'to remove'})
-        openerp.modules.registry.RegistryManager.signal_registry_change(cr.dbname)
         return dict(ACTION_DICT, name=_('Uninstall'))
 
     def button_uninstall_cancel(self, cr, uid, ids, context=None):

openerp/addons/base/res/res_config.py

@@ -360,7 +360,6 @@ class res_config_installer(osv.osv_memory):
             modules.search(cr, uid, [('name','in',to_install)]),
             'to install', ['uninstalled'], context=context)
         cr.commit()
-        openerp.modules.registry.RegistryManager.signal_registry_change(cr.dbname)
         new_db, self.pool = pooler.restart_pool(cr.dbname, update_module=True)
 
 res_config_installer()

openerp/modules/loading.py

@@ -34,6 +34,7 @@ import openerp
 import openerp.modules.db
 import openerp.modules.graph
 import openerp.modules.migration
+import openerp.modules.registry
 import openerp.osv as osv
 import openerp.pooler as pooler
 import openerp.tools as tools

openerp/modules/registry.py

@@ -232,6 +232,9 @@ class RegistryManager(object):
 
         registry.ready = True
 
+        if update_module:
+            # only in case of update, otherwise we'll have an infinite reload loop!
+            cls.signal_registry_change(db_name)
         return registry
 
     @classmethod