def __init__(self):
self.__storage = None
self.__policies = []
self._transformation_reader = None
self.reader_factory = None
self.writer_factory = None
self.add_policy(StoragePolicy())
self.cache = ObjectCache()
def __init__(self):
self.__storage = None
self.__policies = []
self._transformation_reader = None
self.reader_factory = None
self.writer_factory = None
self.add_policy(StoragePolicy())
self.cache = ObjectCache()
class PersistenceManager(object):
implements(IPersistenceManager)
_UNIQUE = object()
def __init__(self):
self.__storage = None
self.__policies = []
self._transformation_reader = None
self.reader_factory = None
self.writer_factory = None
self.add_policy(StoragePolicy())
self.cache = ObjectCache()
def get_cache(self):
return self.cache
def get_storage(self):
return self.__storage
def get_policy(self):
return self.__policies[0]
def get_policies(self):
return self.__policies[:]
def get_reader_factory(self):
return self.reader_factory
def get_writer_factory(self):
return self.writer_factory
def set_reader_factory(self, factory):
self.reader_factory = factory
self._transformation_reader = factory()
self._transformation_reader.set_manager(self)
def set_writer_factory(self, factory):
self.writer_factory = factory
def set_storage(self, storage):
if not IStorage.providedBy(storage):
raise TypeError('Storage instance must provide IStorage.')
if self.storage is not None:
self.storage.commit()
self.__storage = storage
storage.set_manager(self)
def add_policy(self, policy):
if not IStoragePolicy.providedBy(policy):
raise TypeError('Policy instance must provide IStoragePolicy.')
if policy in self.__policies:
raise TypeError('Policy already exists in manager.')
policy.set_manager(self)
self.__policies.append(policy)
def remove_policy(self, policy):
if policy is self.__policies[0]:
raise TypeError('Cannot remove default policy.')
self.__policies.remove(policy)
storage = property(get_storage, set_storage)
policy = property(get_policy)
policies = property(get_policies)
def new_oid(self):
return self.storage.generate_oid()
def get_oid(self, instance):
print 'get_oid(%s)' % (instance,)
if isinstance(instance, _never_persistent):
print '\t-> None, is instance of _never_persistent'
return None
if type(instance) in (dict, list):
print '\t-> None, type in dict, list'
return None
if not IPersistent.providedBy(instance):
print '\t-> None, IPersistent not provided by instance'
return None
persistent = IPersistentObject(instance)
if persistent.get_oid() is None:
self._configure_persistence(persistent)
persistent.set_loaded()
persistent.set_unsaved()
elif not persistent.is_persistent():
print '\t-> None, not persistent.is_persistent()'
return None
oid = persistent.get_oid()
print '\t%s OID => %s' % (instance, oid)
return oid
def _configure_persistence(self, persistent, oid = None):
manager = persistent.get_manager()
if manager is None:
persistent.set_manager(self)
elif manager is not self:
raise TypeError('Object has different manager')
if persistent.get_oid() is None:
if oid is None:
oid = self.new_oid()
persistent.set_oid(oid)
persistent.enable_persistence()
def get_object(self, oid):
print 'Getting %s' % oid
if not self.cache.has_instance(oid):
print '\tcreating deferred for %s' % oid
deferred = DeferredObject(self.load, oid)
self.cache.add_instance(oid, deferred)
instance = self.cache.as_instance(oid)
print '\tget_object(%s) -> %s' % (oid, instance)
return instance
def load(self, oid):
print 'Loading %s' % oid
instance = self.cache.get_instance(oid, None)
if instance is None or isinstance(instance, DeferredObject):
transformation = self.storage.load_record(oid)
instance = self._transformation_reader.read(transformation)
persistent = IPersistentObject(instance)
self._configure_persistence(persistent, oid)
persistent.set_loaded()
persistent.set_saved()
instance = persistent.get_object()
else:
print '\tloaded from cache!'
print '\tload(%s) -> %s' % (oid, instance)
return instance
def store(self, instance):
written = {}
persistent = IPersistentObject(instance)
oid = persistent.get_oid()
instance = persistent.get_object()
print 'Store %s with OID %s' % (instance, oid)
transformation_writer = self.writer_factory(instance)
transformation_writer.set_manager(self)
for instance in transformation_writer:
persistent = IPersistentObject(instance)
oid = persistent.get_oid()
if written.has_key(oid):
continue
if persistent.is_persistent() and not persistent.is_saved():
instance = persistent.get_object()
transformation = transformation_writer.write(instance)
print '\t-> storing %s with OID %s' % (instance, oid)
self.storage.store_record(oid, transformation)
written[oid] = None
persistent.set_saved()
self.cache.add_instance(oid, instance)
else: print '\t-> not storing %s with OID %s' % (instance, oid)
def make_persistent(self, instance):
print 'Make persistent called with %s' % (instance,)
if not IPersistent.providedBy(instance):
print '\tIPersistent not provided, directly providing'
directly_provides(instance, IPersistent)
persistent = IPersistentObject(instance)
self._configure_persistence(persistent)
persistent.set_unsaved()
self.notify_modified(instance)
def make_persistent_type(self, klass):
if not inspect.isclass(klass):
raise TypeError('Argument must be class.')
if not IPersistent.implementedBy(klass):
class_implements(klass, IPersistent)
def make_transient(self, instance):
persistent = IPersistentObject(instance)
persistent.disable_persistence()
persistent.clear_manager()
def commit_changes(self):
for policy in self.policies:
policy.commit()
def commit_storage(self):
self.storage.commit()
def commit(self):
self.commit_changes()
self.commit_storage()
def terminate(self):
for policy in self.policies:
policy.terminate()
self.storage.terminate()
def notify_modified(self, instance):
persistent = IPersistentObject(instance)
self.policy.note_modified(persistent)
class PersistenceManager(object):
implements(IPersistenceManager)
_UNIQUE = object()
def __init__(self):
self.__storage = None
self.__policies = []
self._transformation_reader = None
self.reader_factory = None
self.writer_factory = None
self.add_policy(StoragePolicy())
self.cache = ObjectCache()
def get_cache(self):
return self.cache
def get_storage(self):
return self.__storage
def get_policy(self):
return self.__policies[0]
def get_policies(self):
return self.__policies[:]
def get_reader_factory(self):
return self.reader_factory
def get_writer_factory(self):
return self.writer_factory
def set_reader_factory(self, factory):
self.reader_factory = factory
self._transformation_reader = factory()
self._transformation_reader.set_manager(self)
def set_writer_factory(self, factory):
self.writer_factory = factory
def set_storage(self, storage):
if not IStorage.providedBy(storage):
raise TypeError('Storage instance must provide IStorage.')
if self.storage is not None:
self.storage.commit()
self.__storage = storage
storage.set_manager(self)
def add_policy(self, policy):
if not IStoragePolicy.providedBy(policy):
raise TypeError('Policy instance must provide IStoragePolicy.')
if policy in self.__policies:
raise TypeError('Policy already exists in manager.')
policy.set_manager(self)
self.__policies.append(policy)
def remove_policy(self, policy):
if policy is self.__policies[0]:
raise TypeError('Cannot remove default policy.')
self.__policies.remove(policy)
storage = property(get_storage, set_storage)
policy = property(get_policy)
policies = property(get_policies)
def new_oid(self):
return self.storage.generate_oid()
def get_oid(self, instance):
print 'get_oid(%s)' % (instance, )
if isinstance(instance, _never_persistent):
print '\t-> None, is instance of _never_persistent'
return None
if type(instance) in (dict, list):
print '\t-> None, type in dict, list'
return None
if not IPersistent.providedBy(instance):
print '\t-> None, IPersistent not provided by instance'
return None
persistent = IPersistentObject(instance)
if persistent.get_oid() is None:
self._configure_persistence(persistent)
persistent.set_loaded()
persistent.set_unsaved()
elif not persistent.is_persistent():
print '\t-> None, not persistent.is_persistent()'
return None
oid = persistent.get_oid()
print '\t%s OID => %s' % (instance, oid)
return oid
def _configure_persistence(self, persistent, oid=None):
manager = persistent.get_manager()
if manager is None:
persistent.set_manager(self)
elif manager is not self:
raise TypeError('Object has different manager')
if persistent.get_oid() is None:
if oid is None:
oid = self.new_oid()
persistent.set_oid(oid)
persistent.enable_persistence()
def get_object(self, oid):
print 'Getting %s' % oid
if not self.cache.has_instance(oid):
print '\tcreating deferred for %s' % oid
deferred = DeferredObject(self.load, oid)
self.cache.add_instance(oid, deferred)
instance = self.cache.as_instance(oid)
print '\tget_object(%s) -> %s' % (oid, instance)
return instance
def load(self, oid):
print 'Loading %s' % oid
instance = self.cache.get_instance(oid, None)
if instance is None or isinstance(instance, DeferredObject):
transformation = self.storage.load_record(oid)
instance = self._transformation_reader.read(transformation)
persistent = IPersistentObject(instance)
self._configure_persistence(persistent, oid)
persistent.set_loaded()
persistent.set_saved()
instance = persistent.get_object()
else:
print '\tloaded from cache!'
print '\tload(%s) -> %s' % (oid, instance)
return instance
def store(self, instance):
written = {}
persistent = IPersistentObject(instance)
oid = persistent.get_oid()
instance = persistent.get_object()
print 'Store %s with OID %s' % (instance, oid)
transformation_writer = self.writer_factory(instance)
transformation_writer.set_manager(self)
for instance in transformation_writer:
persistent = IPersistentObject(instance)
oid = persistent.get_oid()
if written.has_key(oid):
continue
if persistent.is_persistent() and not persistent.is_saved():
instance = persistent.get_object()
transformation = transformation_writer.write(instance)
print '\t-> storing %s with OID %s' % (instance, oid)
self.storage.store_record(oid, transformation)
written[oid] = None
persistent.set_saved()
self.cache.add_instance(oid, instance)
else:
print '\t-> not storing %s with OID %s' % (instance, oid)
def make_persistent(self, instance):
print 'Make persistent called with %s' % (instance, )
if not IPersistent.providedBy(instance):
print '\tIPersistent not provided, directly providing'
directly_provides(instance, IPersistent)
persistent = IPersistentObject(instance)
self._configure_persistence(persistent)
persistent.set_unsaved()
self.notify_modified(instance)
def make_persistent_type(self, klass):
if not inspect.isclass(klass):
raise TypeError('Argument must be class.')
if not IPersistent.implementedBy(klass):
class_implements(klass, IPersistent)
def make_transient(self, instance):
persistent = IPersistentObject(instance)
persistent.disable_persistence()
persistent.clear_manager()
def commit_changes(self):
for policy in self.policies:
policy.commit()
def commit_storage(self):
self.storage.commit()
def commit(self):
self.commit_changes()
self.commit_storage()
def terminate(self):
for policy in self.policies:
policy.terminate()
self.storage.terminate()
def notify_modified(self, instance):
persistent = IPersistentObject(instance)
self.policy.note_modified(persistent)
