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# Copyright 2014 OpenStack Foundation
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from trove.db import get_db_api
def persisted_models():
return {'conductor_lastseen': LastSeen}
class LastSeen(object):
"""A table used only by Conductor to discard messages that arrive
late and out of order.
"""
_auto_generated_attrs = []
_data_fields = ['instance_id', 'method_name', 'sent']
_table_name = 'conductor_lastseen'
preserve_on_delete = False
def __init__(self, instance_id, method_name, sent):
self.instance_id = instance_id
self.method_name = method_name
self.sent = sent
def save(self):
return get_db_api().save(self)
@classmethod
def load(cls, instance_id, method_name):
seen = get_db_api().find_by(cls,
instance_id=instance_id,
method_name=method_name)
return seen
@classmethod
def create(cls, instance_id, method_name, sent):
seen = LastSeen(instance_id, method_name, sent)
return seen.save()
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