openstack/nova
Code Issues Proposed changes

Refactor db.service_destroy and db.service_update methods

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Remove session parameter from db.service_get method

Optimize db.service_destroy:
Was:
1 request with join to get service with compute_node
1 request to delete service
1(0) to delete compute_node
Now:
1 request (without join) to delete service
1 request to delete compute_node

Optimize db.service_update:
Remove unused join.

Fixes bug 1157442

blueprint db-session-cleanup

Change-Id: Ifcc8fdebfc95daec736464cbc9e16301116540aa
This commit is contained in:
Boris Pavlovic
2013-03-20 01:33:00 +04:00
parent ac0c8d41c6
commit 2b7caba105
1 changed files with 24 additions and 12 deletions
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36
nova/db/sqlalchemy/api.py
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@@ -324,27 +324,38 @@ class InequalityCondition(object):
def service_destroy(context, service_id):
session = get_session()
with session.begin():
service_ref = service_get(context, service_id, session=session)
service_ref.soft_delete(session=session)
count = model_query(context, models.Service, session=session).\
filter_by(id=service_id).\
soft_delete(synchronize_session=False)
if (service_ref.topic == CONF.compute_topic and
service_ref.compute_node):
for c in service_ref.compute_node:
c.soft_delete(session=session)
if count == 0:
raise exception.ServiceNotFound(service_id=service_id)
model_query(context, models.ComputeNode, session=session).\
filter_by(service_id=service_id).\
soft_delete(synchronize_session=False)
@require_admin_context
def service_get(context, service_id, session=None):
result = model_query(context, models.Service, session=session).\
options(joinedload('compute_node')).\
filter_by(id=service_id).\
first()
def _service_get(context, service_id, with_compute_node=True, session=None):
query = model_query(context, models.Service, session=session).\
filter_by(id=service_id)
if with_compute_node:
query = query.options(joinedload('compute_node'))
result = query.first()
if not result:
raise exception.ServiceNotFound(service_id=service_id)
return result
@require_admin_context
def service_get(context, service_id):
return _service_get(context, service_id)
@require_admin_context
def service_get_all(context, disabled=None):
query = model_query(context, models.Service)
@@ -420,7 +431,8 @@ def service_create(context, values):
def service_update(context, service_id, values):
session = get_session()
with session.begin():
service_ref = service_get(context, service_id, session=session)
service_ref = _service_get(context, service_id,
with_compute_node=False, session=session)
service_ref.update(values)
service_ref.save(session=session)
return service_ref