from sqlalchemy.testing import assert_raises_message, assert_raises
import sqlalchemy as sa
from sqlalchemy import testing
from sqlalchemy import Integer, String
from sqlalchemy.testing.schema import Table, Column
from sqlalchemy.orm import mapper, relationship, \
    create_session, class_mapper, \
    Mapper, column_property, query, \
    Session, sessionmaker, attributes, configure_mappers
from sqlalchemy.orm.instrumentation import ClassManager
from sqlalchemy.orm import instrumentation, events
from sqlalchemy.testing import eq_
from sqlalchemy.testing import fixtures
from sqlalchemy.testing import AssertsCompiledSQL
from sqlalchemy.testing.util import gc_collect
from test.orm import _fixtures
from sqlalchemy import event
from sqlalchemy.testing.mock import Mock, call, ANY


class _RemoveListeners(object):

    def teardown(self):
        events.MapperEvents._clear()
        events.InstanceEvents._clear()
        events.SessionEvents._clear()
        events.InstrumentationEvents._clear()
        events.QueryEvents._clear()
        super(_RemoveListeners, self).teardown()


class MapperEventsTest(_RemoveListeners, _fixtures.FixtureTest):
    run_inserts = None

    @classmethod
    def define_tables(cls, metadata):
        super(MapperEventsTest, cls).define_tables(metadata)
        metadata.tables['users'].append_column(
            Column('extra', Integer, default=5, onupdate=10)
        )

    def test_instance_event_listen(self):
        """test listen targets for instance events"""

        users, addresses = self.tables.users, self.tables.addresses

        canary = []

        class A(object):
            pass

        class B(A):
            pass

        mapper(A, users)
        mapper(B, addresses, inherits=A,
               properties={'address_id': addresses.c.id})

        def init_a(target, args, kwargs):
            canary.append(('init_a', target))

        def init_b(target, args, kwargs):
            canary.append(('init_b', target))

        def init_c(target, args, kwargs):
            canary.append(('init_c', target))

        def init_d(target, args, kwargs):
            canary.append(('init_d', target))

        def init_e(target, args, kwargs):
            canary.append(('init_e', target))

        event.listen(mapper, 'init', init_a)
        event.listen(Mapper, 'init', init_b)
        event.listen(class_mapper(A), 'init', init_c)
        event.listen(A, 'init', init_d)
        event.listen(A, 'init', init_e, propagate=True)

        a = A()
        eq_(canary, [('init_a', a), ('init_b', a),
                     ('init_c', a), ('init_d', a), ('init_e', a)])

        # test propagate flag
        canary[:] = []
        b = B()
        eq_(canary, [('init_a', b), ('init_b', b), ('init_e', b)])

    def listen_all(self, mapper, **kw):
        canary = []

        def evt(meth):
            def go(*args, **kwargs):
                canary.append(meth)
            return go

        for meth in [
            'init',
            'init_failure',
            'load',
            'refresh',
            'refresh_flush',
            'expire',
            'before_insert',
            'after_insert',
            'before_update',
            'after_update',
            'before_delete',
            'after_delete'
        ]:
            event.listen(mapper, meth, evt(meth), **kw)
        return canary

    def test_init_allow_kw_modify(self):
        User, users = self.classes.User, self.tables.users
        mapper(User, users)

        @event.listens_for(User, 'init')
        def add_name(obj, args, kwargs):
            kwargs['name'] = 'ed'

        u1 = User()
        eq_(u1.name, 'ed')

    def test_init_failure_hook(self):
        users = self.tables.users

        class Thing(object):
            def __init__(self, **kw):
                if kw.get('fail'):
                    raise Exception("failure")

        mapper(Thing, users)

        canary = Mock()
        event.listen(Thing, 'init_failure', canary)

        Thing()
        eq_(canary.mock_calls, [])

        assert_raises_message(
            Exception,
            "failure",
            Thing, fail=True
        )
        eq_(
            canary.mock_calls,
            [call(ANY, (), {'fail': True})]
        )

    def test_listen_doesnt_force_compile(self):
        User, users = self.classes.User, self.tables.users
        m = mapper(User, users, properties={
            'addresses': relationship(lambda: ImNotAClass)
        })
        event.listen(User, "before_insert", lambda *a, **kw: None)
        assert not m.configured

    def test_basic(self):
        User, users = self.classes.User, self.tables.users

        mapper(User, users)
        canary = self.listen_all(User)
        named_canary = self.listen_all(User, named=True)

        sess = create_session()
        u = User(name='u1')
        sess.add(u)
        sess.flush()
        sess.expire(u)
        u = sess.query(User).get(u.id)
        sess.expunge_all()
        u = sess.query(User).get(u.id)
        u.name = 'u1 changed'
        sess.flush()
        sess.delete(u)
        sess.flush()
        expected = [
            'init', 'before_insert',
            'refresh_flush',
            'after_insert', 'expire',
            'refresh',
            'load',
            'before_update', 'refresh_flush', 'after_update', 'before_delete',
            'after_delete']
        eq_(canary, expected)
        eq_(named_canary, expected)

    def test_insert_before_configured(self):
        users, User = self.tables.users, self.classes.User

        mapper(User, users)

        canary = Mock()

        event.listen(mapper, "before_configured", canary.listen1)
        event.listen(mapper, "before_configured", canary.listen2, insert=True)
        event.listen(mapper, "before_configured", canary.listen3)
        event.listen(mapper, "before_configured", canary.listen4, insert=True)

        configure_mappers()

        eq_(
            canary.mock_calls,
            [call.listen4(), call.listen2(), call.listen1(), call.listen3()]
        )

    def test_insert_flags(self):
        users, User = self.tables.users, self.classes.User

        m = mapper(User, users)

        canary = Mock()

        arg = Mock()

        event.listen(m, "before_insert", canary.listen1, )
        event.listen(m, "before_insert", canary.listen2, insert=True)
        event.listen(m, "before_insert", canary.listen3, propagate=True, insert=True)
        event.listen(m, "load", canary.listen4)
        event.listen(m, "load", canary.listen5, insert=True)
        event.listen(m, "load", canary.listen6, propagate=True, insert=True)

        u1 = User()
        state = u1._sa_instance_state
        m.dispatch.before_insert(arg, arg, arg)
        m.class_manager.dispatch.load(arg, arg)
        eq_(
            canary.mock_calls,
            [
                call.listen3(arg, arg, arg.obj()),
                call.listen2(arg, arg, arg.obj()),
                call.listen1(arg, arg, arg.obj()),
                call.listen6(arg.obj(), arg),
                call.listen5(arg.obj(), arg),
                call.listen4(arg.obj(), arg)
            ]
        )

    def test_merge(self):
        users, User = self.tables.users, self.classes.User

        mapper(User, users)

        canary = []

        def load(obj, ctx):
            canary.append('load')
        event.listen(mapper, 'load', load)

        s = Session()
        u = User(name='u1')
        s.add(u)
        s.commit()
        s = Session()
        u2 = s.merge(u)
        s = Session()
        u2 = s.merge(User(name='u2'))  # noqa
        s.commit()
        s.query(User).order_by(User.id).first()
        eq_(canary, ['load', 'load', 'load'])

    def test_inheritance(self):
        users, addresses, User = (self.tables.users,
                                  self.tables.addresses,
                                  self.classes.User)

        class AdminUser(User):
            pass

        mapper(User, users)
        mapper(AdminUser, addresses, inherits=User,
               properties={'address_id': addresses.c.id})

        canary1 = self.listen_all(User, propagate=True)
        canary2 = self.listen_all(User)
        canary3 = self.listen_all(AdminUser)

        sess = create_session()
        am = AdminUser(name='au1', email_address='au1@e1')
        sess.add(am)
        sess.flush()
        am = sess.query(AdminUser).populate_existing().get(am.id)
        sess.expunge_all()
        am = sess.query(AdminUser).get(am.id)
        am.name = 'au1 changed'
        sess.flush()
        sess.delete(am)
        sess.flush()
        eq_(canary1, ['init', 'before_insert', 'refresh_flush', 'after_insert',
                      'refresh', 'load',
                      'before_update', 'refresh_flush',
                      'after_update', 'before_delete',
                      'after_delete'])
        eq_(canary2, [])
        eq_(canary3, ['init', 'before_insert', 'refresh_flush', 'after_insert',
                      'refresh',
                      'load',
                      'before_update', 'refresh_flush',
                      'after_update', 'before_delete',
                      'after_delete'])

    def test_inheritance_subclass_deferred(self):
        users, addresses, User = (self.tables.users,
                                  self.tables.addresses,
                                  self.classes.User)

        mapper(User, users)

        canary1 = self.listen_all(User, propagate=True)
        canary2 = self.listen_all(User)

        class AdminUser(User):
            pass
        mapper(AdminUser, addresses, inherits=User,
               properties={'address_id': addresses.c.id})
        canary3 = self.listen_all(AdminUser)

        sess = create_session()
        am = AdminUser(name='au1', email_address='au1@e1')
        sess.add(am)
        sess.flush()
        am = sess.query(AdminUser).populate_existing().get(am.id)
        sess.expunge_all()
        am = sess.query(AdminUser).get(am.id)
        am.name = 'au1 changed'
        sess.flush()
        sess.delete(am)
        sess.flush()
        eq_(canary1, ['init', 'before_insert', 'refresh_flush', 'after_insert',
                      'refresh', 'load',
                      'before_update', 'refresh_flush',
                      'after_update', 'before_delete',
                      'after_delete'])
        eq_(canary2, [])
        eq_(canary3, ['init', 'before_insert', 'refresh_flush', 'after_insert',
                      'refresh', 'load',
                      'before_update', 'refresh_flush',
                      'after_update', 'before_delete',
                      'after_delete'])

    def test_before_after_only_collection(self):
        """before_update is called on parent for collection modifications,
        after_update is called even if no columns were updated.

        """

        keywords, items, item_keywords, Keyword, Item = (
            self.tables.keywords,
            self.tables.items,
            self.tables.item_keywords,
            self.classes.Keyword,
            self.classes.Item)

        mapper(Item, items, properties={
            'keywords': relationship(Keyword, secondary=item_keywords)})
        mapper(Keyword, keywords)

        canary1 = self.listen_all(Item)
        canary2 = self.listen_all(Keyword)

        sess = create_session()
        i1 = Item(description="i1")
        k1 = Keyword(name="k1")
        sess.add(i1)
        sess.add(k1)
        sess.flush()
        eq_(canary1,
            ['init',
             'before_insert', 'after_insert'])
        eq_(canary2,
            ['init',
             'before_insert', 'after_insert'])

        canary1[:] = []
        canary2[:] = []

        i1.keywords.append(k1)
        sess.flush()
        eq_(canary1, ['before_update', 'after_update'])
        eq_(canary2, [])

    def test_before_after_configured_warn_on_non_mapper(self):
        User, users = self.classes.User, self.tables.users

        m1 = Mock()

        mapper(User, users)
        assert_raises_message(
            sa.exc.SAWarning,
            r"before_configured' and 'after_configured' ORM events only "
            r"invoke with the mapper\(\) function or Mapper class as "
            r"the target.",
            event.listen, User, 'before_configured', m1
        )

        assert_raises_message(
            sa.exc.SAWarning,
            r"before_configured' and 'after_configured' ORM events only "
            r"invoke with the mapper\(\) function or Mapper class as "
            r"the target.",
            event.listen, User, 'after_configured', m1
        )

    def test_before_after_configured(self):
        User, users = self.classes.User, self.tables.users

        m1 = Mock()
        m2 = Mock()

        mapper(User, users)

        event.listen(mapper, "before_configured", m1)
        event.listen(mapper, "after_configured", m2)

        s = Session()
        s.query(User)

        eq_(m1.mock_calls, [call()])
        eq_(m2.mock_calls, [call()])

    def test_instrument_event(self):
        Address, addresses, users, User = (self.classes.Address,
                                           self.tables.addresses,
                                           self.tables.users,
                                           self.classes.User)

        canary = []

        def instrument_class(mapper, cls):
            canary.append(cls)

        event.listen(Mapper, 'instrument_class', instrument_class)

        mapper(User, users)
        eq_(canary, [User])
        mapper(Address, addresses)
        eq_(canary, [User, Address])

    def test_instrument_class_precedes_class_instrumentation(self):
        users = self.tables.users

        class MyClass(object):
            pass

        canary = Mock()

        def my_init(self):
            canary.init()

        # mapper level event
        @event.listens_for(mapper, "instrument_class")
        def instrument_class(mp, class_):
            canary.instrument_class(class_)
            class_.__init__ = my_init

        # instrumentationmanager event
        @event.listens_for(object, "class_instrument")
        def class_instrument(class_):
            canary.class_instrument(class_)

        mapper(MyClass, users)

        m1 = MyClass()
        assert attributes.instance_state(m1)

        eq_(
            [
                call.instrument_class(MyClass),
                call.class_instrument(MyClass),
                call.init()
            ],
            canary.mock_calls
        )


class DeclarativeEventListenTest(_RemoveListeners,
                                 fixtures.DeclarativeMappedTest):
    run_setup_classes = "each"
    run_deletes = None

    def test_inheritance_propagate_after_config(self):
        # test [ticket:2949]

        class A(self.DeclarativeBasic):
            __tablename__ = 'a'
            id = Column(Integer, primary_key=True)

        class B(A):
            pass

        listen = Mock()
        event.listen(self.DeclarativeBasic, "load", listen, propagate=True)

        class C(B):
            pass

        m1 = A.__mapper__.class_manager
        m2 = B.__mapper__.class_manager
        m3 = C.__mapper__.class_manager
        a1 = A()
        b1 = B()
        c1 = C()
        m3.dispatch.load(c1._sa_instance_state, "c")
        m2.dispatch.load(b1._sa_instance_state, "b")
        m1.dispatch.load(a1._sa_instance_state, "a")
        eq_(
            listen.mock_calls,
            [call(c1, "c"), call(b1, "b"), call(a1, "a")]
        )


class DeferredMapperEventsTest(_RemoveListeners, _fixtures.FixtureTest):

    """"test event listeners against unmapped classes.

    This incurs special logic.  Note if we ever do the "remove" case,
    it has to get all of these, too.

    """
    run_inserts = None

    def test_deferred_map_event(self):
        """
        1. mapper event listen on class
        2. map class
        3. event fire should receive event

        """
        users, User = (self.tables.users,
                       self.classes.User)

        canary = []

        def evt(x, y, z):
            canary.append(x)
        event.listen(User, "before_insert", evt, raw=True)

        m = mapper(User, users)
        m.dispatch.before_insert(5, 6, 7)
        eq_(canary, [5])

    def test_deferred_map_event_subclass_propagate(self):
        """
        1. mapper event listen on class, w propagate
        2. map only subclass of class
        3. event fire should receive event

        """
        users, User = (self.tables.users,
                       self.classes.User)

        class SubUser(User):
            pass

        class SubSubUser(SubUser):
            pass

        canary = Mock()

        def evt(x, y, z):
            canary.append(x)
        event.listen(User, "before_insert", canary, propagate=True, raw=True)

        m = mapper(SubUser, users)
        m.dispatch.before_insert(5, 6, 7)
        eq_(canary.mock_calls,
            [call(5, 6, 7)])

        m2 = mapper(SubSubUser, users)

        m2.dispatch.before_insert(8, 9, 10)
        eq_(canary.mock_calls,
            [call(5, 6, 7), call(8, 9, 10)])

    def test_deferred_map_event_subclass_no_propagate(self):
        """
        1. mapper event listen on class, w/o propagate
        2. map only subclass of class
        3. event fire should not receive event

        """
        users, User = (self.tables.users,
                       self.classes.User)

        class SubUser(User):
            pass

        canary = []

        def evt(x, y, z):
            canary.append(x)
        event.listen(User, "before_insert", evt, propagate=False)

        m = mapper(SubUser, users)
        m.dispatch.before_insert(5, 6, 7)
        eq_(canary, [])

    def test_deferred_map_event_subclass_post_mapping_propagate(self):
        """
        1. map only subclass of class
        2. mapper event listen on class, w propagate
        3. event fire should receive event

        """
        users, User = (self.tables.users,
                       self.classes.User)

        class SubUser(User):
            pass

        m = mapper(SubUser, users)

        canary = []

        def evt(x, y, z):
            canary.append(x)
        event.listen(User, "before_insert", evt, propagate=True, raw=True)

        m.dispatch.before_insert(5, 6, 7)
        eq_(canary, [5])

    def test_deferred_map_event_subclass_post_mapping_propagate_two(self):
        """
        1. map only subclass of class
        2. mapper event listen on class, w propagate
        3. event fire should receive event

        """
        users, User = (self.tables.users,
                       self.classes.User)

        class SubUser(User):
            pass

        class SubSubUser(SubUser):
            pass

        m = mapper(SubUser, users)

        canary = Mock()
        event.listen(User, "before_insert", canary, propagate=True, raw=True)

        m2 = mapper(SubSubUser, users)

        m.dispatch.before_insert(5, 6, 7)
        eq_(canary.mock_calls, [call(5, 6, 7)])

        m2.dispatch.before_insert(8, 9, 10)
        eq_(canary.mock_calls, [call(5, 6, 7), call(8, 9, 10)])

    def test_deferred_instance_event_subclass_post_mapping_propagate(self):
        """
        1. map only subclass of class
        2. instance event listen on class, w propagate
        3. event fire should receive event

        """
        users, User = (self.tables.users,
                       self.classes.User)

        class SubUser(User):
            pass

        m = mapper(SubUser, users)

        canary = []

        def evt(x):
            canary.append(x)
        event.listen(User, "load", evt, propagate=True, raw=True)

        m.class_manager.dispatch.load(5)
        eq_(canary, [5])

    def test_deferred_instance_event_plain(self):
        """
        1. instance event listen on class, w/o propagate
        2. map class
        3. event fire should receive event

        """
        users, User = (self.tables.users,
                       self.classes.User)

        canary = []

        def evt(x):
            canary.append(x)
        event.listen(User, "load", evt, raw=True)

        m = mapper(User, users)
        m.class_manager.dispatch.load(5)
        eq_(canary, [5])

    def test_deferred_instance_event_subclass_propagate_subclass_only(self):
        """
        1. instance event listen on class, w propagate
        2. map two subclasses of class
        3. event fire on each class should receive one and only one event

        """
        users, User = (self.tables.users,
                       self.classes.User)

        class SubUser(User):
            pass

        class SubUser2(User):
            pass

        canary = []

        def evt(x):
            canary.append(x)
        event.listen(User, "load", evt, propagate=True, raw=True)

        m = mapper(SubUser, users)
        m2 = mapper(SubUser2, users)

        m.class_manager.dispatch.load(5)
        eq_(canary, [5])

        m2.class_manager.dispatch.load(5)
        eq_(canary, [5, 5])

    def test_deferred_instance_event_subclass_propagate_baseclass(self):
        """
        1. instance event listen on class, w propagate
        2. map one subclass of class, map base class, leave 2nd subclass
           unmapped
        3. event fire on sub should receive one and only one event
        4. event fire on base should receive one and only one event
        5. map 2nd subclass
        6. event fire on 2nd subclass should receive one and only one event
        """
        users, User = (self.tables.users,
                       self.classes.User)

        class SubUser(User):
            pass

        class SubUser2(User):
            pass

        canary = Mock()
        event.listen(User, "load", canary, propagate=True, raw=False)

        # reversing these fixes....
        m = mapper(SubUser, users)
        m2 = mapper(User, users)

        instance = Mock()
        m.class_manager.dispatch.load(instance)

        eq_(canary.mock_calls, [call(instance.obj())])

        m2.class_manager.dispatch.load(instance)
        eq_(canary.mock_calls, [call(instance.obj()), call(instance.obj())])

        m3 = mapper(SubUser2, users)
        m3.class_manager.dispatch.load(instance)
        eq_(canary.mock_calls, [call(instance.obj()),
                                call(instance.obj()), call(instance.obj())])

    def test_deferred_instance_event_subclass_no_propagate(self):
        """
        1. instance event listen on class, w/o propagate
        2. map subclass
        3. event fire on subclass should not receive event
        """
        users, User = (self.tables.users,
                       self.classes.User)

        class SubUser(User):
            pass

        canary = []

        def evt(x):
            canary.append(x)
        event.listen(User, "load", evt, propagate=False)

        m = mapper(SubUser, users)
        m.class_manager.dispatch.load(5)
        eq_(canary, [])

    def test_deferred_instrument_event(self):
        User = self.classes.User

        canary = []

        def evt(x):
            canary.append(x)
        event.listen(User, "attribute_instrument", evt)

        instrumentation._instrumentation_factory.\
            dispatch.attribute_instrument(User)
        eq_(canary, [User])

    def test_isolation_instrument_event(self):
        User = self.classes.User

        class Bar(object):
            pass

        canary = []

        def evt(x):
            canary.append(x)
        event.listen(Bar, "attribute_instrument", evt)

        instrumentation._instrumentation_factory.dispatch.\
            attribute_instrument(User)
        eq_(canary, [])

    @testing.requires.predictable_gc
    def test_instrument_event_auto_remove(self):
        class Bar(object):
            pass

        dispatch = instrumentation._instrumentation_factory.dispatch
        assert not dispatch.attribute_instrument

        event.listen(Bar, "attribute_instrument", lambda: None)

        eq_(len(dispatch.attribute_instrument), 1)

        del Bar
        gc_collect()

        assert not dispatch.attribute_instrument

    def test_deferred_instrument_event_subclass_propagate(self):
        User = self.classes.User

        class SubUser(User):
            pass

        canary = []

        def evt(x):
            canary.append(x)
        event.listen(User, "attribute_instrument", evt, propagate=True)

        instrumentation._instrumentation_factory.dispatch.\
            attribute_instrument(SubUser)
        eq_(canary, [SubUser])

    def test_deferred_instrument_event_subclass_no_propagate(self):
        users, User = (self.tables.users,
                       self.classes.User)

        class SubUser(User):
            pass

        canary = []

        def evt(x):
            canary.append(x)
        event.listen(User, "attribute_instrument", evt, propagate=False)

        mapper(SubUser, users)
        instrumentation._instrumentation_factory.dispatch.\
            attribute_instrument(5)
        eq_(canary, [])


class LoadTest(_fixtures.FixtureTest):
    run_inserts = None

    @classmethod
    def setup_mappers(cls):
        User, users = cls.classes.User, cls.tables.users

        mapper(User, users)

    def _fixture(self):
        User = self.classes.User

        canary = []

        def load(target, ctx):
            canary.append("load")

        def refresh(target, ctx, attrs):
            canary.append(("refresh", attrs))

        event.listen(User, "load", load)
        event.listen(User, "refresh", refresh)
        return canary

    def test_just_loaded(self):
        User = self.classes.User

        canary = self._fixture()

        sess = Session()

        u1 = User(name='u1')
        sess.add(u1)
        sess.commit()
        sess.close()

        sess.query(User).first()
        eq_(canary, ['load'])

    def test_repeated_rows(self):
        User = self.classes.User

        canary = self._fixture()

        sess = Session()

        u1 = User(name='u1')
        sess.add(u1)
        sess.commit()
        sess.close()

        sess.query(User).union_all(sess.query(User)).all()
        eq_(canary, ['load'])


class RemovalTest(_fixtures.FixtureTest):
    run_inserts = None

    def test_attr_propagated(self):
        User = self.classes.User

        users, addresses, User = (self.tables.users,
                                  self.tables.addresses,
                                  self.classes.User)

        class AdminUser(User):
            pass

        mapper(User, users)
        mapper(AdminUser, addresses, inherits=User,
               properties={'address_id': addresses.c.id})

        fn = Mock()
        event.listen(User.name, "set", fn, propagate=True)

        au = AdminUser()
        au.name = 'ed'

        eq_(fn.call_count, 1)

        event.remove(User.name, "set", fn)

        au.name = 'jack'

        eq_(fn.call_count, 1)

    def test_unmapped_listen(self):
        users = self.tables.users

        class Foo(object):
            pass

        fn = Mock()

        event.listen(Foo, "before_insert", fn, propagate=True)

        class User(Foo):
            pass

        m = mapper(User, users)

        u1 = User()
        m.dispatch.before_insert(m, None, attributes.instance_state(u1))
        eq_(fn.call_count, 1)

        event.remove(Foo, "before_insert", fn)

        # existing event is removed
        m.dispatch.before_insert(m, None, attributes.instance_state(u1))
        eq_(fn.call_count, 1)

        # the _HoldEvents is also cleaned out
        class Bar(Foo):
            pass
        m = mapper(Bar, users)
        b1 = Bar()
        m.dispatch.before_insert(m, None, attributes.instance_state(b1))
        eq_(fn.call_count, 1)

    def test_instance_event_listen_on_cls_before_map(self):
        users = self.tables.users

        fn = Mock()

        class User(object):
            pass

        event.listen(User, "load", fn)
        m = mapper(User, users)

        u1 = User()
        m.class_manager.dispatch.load(u1._sa_instance_state, "u1")

        event.remove(User, "load", fn)

        m.class_manager.dispatch.load(u1._sa_instance_state, "u2")

        eq_(fn.mock_calls, [call(u1, "u1")])


class RefreshTest(_fixtures.FixtureTest):
    run_inserts = None

    @classmethod
    def setup_mappers(cls):
        User, users = cls.classes.User, cls.tables.users

        mapper(User, users)

    def _fixture(self):
        User = self.classes.User

        canary = []

        def load(target, ctx):
            canary.append("load")

        def refresh(target, ctx, attrs):
            canary.append(("refresh", attrs))

        event.listen(User, "load", load)
        event.listen(User, "refresh", refresh)
        return canary

    def test_already_present(self):
        User = self.classes.User

        canary = self._fixture()

        sess = Session()

        u1 = User(name='u1')
        sess.add(u1)
        sess.flush()

        sess.query(User).first()
        eq_(canary, [])

    def test_changes_reset(self):
        """test the contract of load/refresh such that history is reset.

        This has never been an official contract but we are testing it
        here to ensure it is maintained given the loading performance
        enhancements.

        """
        User = self.classes.User

        @event.listens_for(User, "load")
        def canary1(obj, context):
            obj.name = 'new name!'

        @event.listens_for(User, "refresh")
        def canary2(obj, context, props):
            obj.name = 'refreshed name!'

        sess = Session()
        u1 = User(name='u1')
        sess.add(u1)
        sess.commit()
        sess.close()

        u1 = sess.query(User).first()
        eq_(
            attributes.get_history(u1, "name"),
            ((), ['new name!'], ())
        )
        assert "name" not in attributes.instance_state(u1).committed_state
        assert u1 not in sess.dirty

        sess.expire(u1)
        u1.id
        eq_(
            attributes.get_history(u1, "name"),
            ((), ['refreshed name!'], ())
        )
        assert "name" not in attributes.instance_state(u1).committed_state
        assert u1 in sess.dirty

    def test_repeated_rows(self):
        User = self.classes.User

        canary = self._fixture()

        sess = Session()

        u1 = User(name='u1')
        sess.add(u1)
        sess.commit()

        sess.query(User).union_all(sess.query(User)).all()
        eq_(canary, [('refresh', set(['id', 'name']))])

    def test_via_refresh_state(self):
        User = self.classes.User

        canary = self._fixture()

        sess = Session()

        u1 = User(name='u1')
        sess.add(u1)
        sess.commit()

        u1.name
        eq_(canary, [('refresh', set(['id', 'name']))])

    def test_was_expired(self):
        User = self.classes.User

        canary = self._fixture()

        sess = Session()

        u1 = User(name='u1')
        sess.add(u1)
        sess.flush()
        sess.expire(u1)

        sess.query(User).first()
        eq_(canary, [('refresh', set(['id', 'name']))])

    def test_was_expired_via_commit(self):
        User = self.classes.User

        canary = self._fixture()

        sess = Session()

        u1 = User(name='u1')
        sess.add(u1)
        sess.commit()

        sess.query(User).first()
        eq_(canary, [('refresh', set(['id', 'name']))])

    def test_was_expired_attrs(self):
        User = self.classes.User

        canary = self._fixture()

        sess = Session()

        u1 = User(name='u1')
        sess.add(u1)
        sess.flush()
        sess.expire(u1, ['name'])

        sess.query(User).first()
        eq_(canary, [('refresh', set(['name']))])

    def test_populate_existing(self):
        User = self.classes.User

        canary = self._fixture()

        sess = Session()

        u1 = User(name='u1')
        sess.add(u1)
        sess.commit()

        sess.query(User).populate_existing().first()
        eq_(canary, [('refresh', None)])


class SessionEventsTest(_RemoveListeners, _fixtures.FixtureTest):
    run_inserts = None

    def test_class_listen(self):
        def my_listener(*arg, **kw):
            pass

        event.listen(Session, 'before_flush', my_listener)

        s = Session()
        assert my_listener in s.dispatch.before_flush

    def test_sessionmaker_listen(self):
        """test that listen can be applied to individual
        scoped_session() classes."""

        def my_listener_one(*arg, **kw):
            pass

        def my_listener_two(*arg, **kw):
            pass

        S1 = sessionmaker()
        S2 = sessionmaker()

        event.listen(Session, 'before_flush', my_listener_one)
        event.listen(S1, 'before_flush', my_listener_two)

        s1 = S1()
        assert my_listener_one in s1.dispatch.before_flush
        assert my_listener_two in s1.dispatch.before_flush

        s2 = S2()
        assert my_listener_one in s2.dispatch.before_flush
        assert my_listener_two not in s2.dispatch.before_flush

    def test_scoped_session_invalid_callable(self):
        from sqlalchemy.orm import scoped_session

        def my_listener_one(*arg, **kw):
            pass

        scope = scoped_session(lambda: Session())

        assert_raises_message(
            sa.exc.ArgumentError,
            "Session event listen on a scoped_session requires that its "
            "creation callable is associated with the Session class.",
            event.listen, scope, "before_flush", my_listener_one
        )

    def test_scoped_session_invalid_class(self):
        from sqlalchemy.orm import scoped_session

        def my_listener_one(*arg, **kw):
            pass

        class NotASession(object):

            def __call__(self):
                return Session()

        scope = scoped_session(NotASession)

        assert_raises_message(
            sa.exc.ArgumentError,
            "Session event listen on a scoped_session requires that its "
            "creation callable is associated with the Session class.",
            event.listen, scope, "before_flush", my_listener_one
        )

    def test_scoped_session_listen(self):
        from sqlalchemy.orm import scoped_session

        def my_listener_one(*arg, **kw):
            pass

        scope = scoped_session(sessionmaker())
        event.listen(scope, "before_flush", my_listener_one)

        assert my_listener_one in scope().dispatch.before_flush

    def _listener_fixture(self, **kw):
        canary = []

        def listener(name):
            def go(*arg, **kw):
                canary.append(name)
            return go

        sess = Session(**kw)

        for evt in [
            'after_transaction_create',
            'after_transaction_end',
            'before_commit',
            'after_commit',
            'after_rollback',
            'after_soft_rollback',
            'before_flush',
            'after_flush',
            'after_flush_postexec',
            'after_begin',
            'before_attach',
            'after_attach',
            'after_bulk_update',
            'after_bulk_delete'
        ]:
            event.listen(sess, evt, listener(evt))

        return sess, canary

    def test_flush_autocommit_hook(self):
        User, users = self.classes.User, self.tables.users

        mapper(User, users)

        sess, canary = self._listener_fixture(
            autoflush=False,
            autocommit=True, expire_on_commit=False)

        u = User(name='u1')
        sess.add(u)
        sess.flush()
        eq_(
            canary,
            ['before_attach', 'after_attach', 'before_flush',
             'after_transaction_create', 'after_begin',
             'after_flush', 'after_flush_postexec',
             'before_commit', 'after_commit', 'after_transaction_end']
        )

    def test_rollback_hook(self):
        User, users = self.classes.User, self.tables.users
        sess, canary = self._listener_fixture()
        mapper(User, users)

        u = User(name='u1', id=1)
        sess.add(u)
        sess.commit()

        u2 = User(name='u1', id=1)
        sess.add(u2)
        assert_raises(
            sa.orm.exc.FlushError,
            sess.commit
        )
        sess.rollback()
        eq_(canary,

            ['before_attach', 'after_attach', 'before_commit', 'before_flush',
             'after_transaction_create', 'after_begin', 'after_flush',
             'after_flush_postexec', 'after_transaction_end', 'after_commit',
             'after_transaction_end', 'after_transaction_create',
             'before_attach', 'after_attach', 'before_commit',
             'before_flush', 'after_transaction_create', 'after_begin',
             'after_rollback',
             'after_transaction_end',
             'after_soft_rollback', 'after_transaction_end',
             'after_transaction_create',
             'after_soft_rollback'])

    def test_can_use_session_in_outer_rollback_hook(self):
        User, users = self.classes.User, self.tables.users
        mapper(User, users)

        sess = Session()

        assertions = []

        @event.listens_for(sess, "after_soft_rollback")
        def do_something(session, previous_transaction):
            if session.is_active:
                assertions.append('name' not in u.__dict__)
                assertions.append(u.name == 'u1')

        u = User(name='u1', id=1)
        sess.add(u)
        sess.commit()

        u2 = User(name='u1', id=1)
        sess.add(u2)
        assert_raises(
            sa.orm.exc.FlushError,
            sess.commit
        )
        sess.rollback()
        eq_(assertions, [True, True])

    def test_flush_noautocommit_hook(self):
        User, users = self.classes.User, self.tables.users

        sess, canary = self._listener_fixture()

        mapper(User, users)

        u = User(name='u1')
        sess.add(u)
        sess.flush()
        eq_(canary, ['before_attach', 'after_attach', 'before_flush',
                     'after_transaction_create', 'after_begin',
                     'after_flush', 'after_flush_postexec',
                     'after_transaction_end'])

    def test_flush_in_commit_hook(self):
        User, users = self.classes.User, self.tables.users

        sess, canary = self._listener_fixture()

        mapper(User, users)
        u = User(name='u1')
        sess.add(u)
        sess.flush()
        canary[:] = []

        u.name = 'ed'
        sess.commit()
        eq_(canary, ['before_commit', 'before_flush',
            'after_transaction_create', 'after_flush',
                     'after_flush_postexec',
                     'after_transaction_end',
                     'after_commit',
                     'after_transaction_end', 'after_transaction_create', ])

    def test_state_before_attach(self):
        User, users = self.classes.User, self.tables.users
        sess = Session()

        @event.listens_for(sess, "before_attach")
        def listener(session, inst):
            state = attributes.instance_state(inst)
            if state.key:
                assert state.key not in session.identity_map
            else:
                assert inst not in session.new

        mapper(User, users)
        u = User(name='u1')
        sess.add(u)
        sess.flush()
        sess.expunge(u)
        sess.add(u)

    def test_state_after_attach(self):
        User, users = self.classes.User, self.tables.users
        sess = Session()

        @event.listens_for(sess, "after_attach")
        def listener(session, inst):
            state = attributes.instance_state(inst)
            if state.key:
                assert session.identity_map[state.key] is inst
            else:
                assert inst in session.new

        mapper(User, users)
        u = User(name='u1')
        sess.add(u)
        sess.flush()
        sess.expunge(u)
        sess.add(u)

    def test_standalone_on_commit_hook(self):
        sess, canary = self._listener_fixture()
        sess.commit()
        eq_(canary, ['before_commit', 'after_commit',
                     'after_transaction_end',
                     'after_transaction_create'])

    def test_on_bulk_update_hook(self):
        User, users = self.classes.User, self.tables.users

        sess = Session()
        canary = Mock()

        event.listen(sess, "after_begin", canary.after_begin)
        event.listen(sess, "after_bulk_update", canary.after_bulk_update)

        def legacy(ses, qry, ctx, res):
            canary.after_bulk_update_legacy(ses, qry, ctx, res)
        event.listen(sess, "after_bulk_update", legacy)

        mapper(User, users)

        sess.query(User).update({'name': 'foo'})

        eq_(
            canary.after_begin.call_count,
            1
        )
        eq_(
            canary.after_bulk_update.call_count,
            1
        )

        upd = canary.after_bulk_update.mock_calls[0][1][0]
        eq_(
            upd.session,
            sess
        )
        eq_(
            canary.after_bulk_update_legacy.mock_calls,
            [call(sess, upd.query, upd.context, upd.result)]
        )

    def test_on_bulk_delete_hook(self):
        User, users = self.classes.User, self.tables.users

        sess = Session()
        canary = Mock()

        event.listen(sess, "after_begin", canary.after_begin)
        event.listen(sess, "after_bulk_delete", canary.after_bulk_delete)

        def legacy(ses, qry, ctx, res):
            canary.after_bulk_delete_legacy(ses, qry, ctx, res)
        event.listen(sess, "after_bulk_delete", legacy)

        mapper(User, users)

        sess.query(User).delete()

        eq_(
            canary.after_begin.call_count,
            1
        )
        eq_(
            canary.after_bulk_delete.call_count,
            1
        )

        upd = canary.after_bulk_delete.mock_calls[0][1][0]
        eq_(
            upd.session,
            sess
        )
        eq_(
            canary.after_bulk_delete_legacy.mock_calls,
            [call(sess, upd.query, upd.context, upd.result)]
        )

    def test_connection_emits_after_begin(self):
        sess, canary = self._listener_fixture(bind=testing.db)
        sess.connection()
        eq_(canary, ['after_begin'])
        sess.close()

    def test_reentrant_flush(self):
        users, User = self.tables.users, self.classes.User

        mapper(User, users)

        def before_flush(session, flush_context, objects):
            session.flush()

        sess = Session()
        event.listen(sess, 'before_flush', before_flush)
        sess.add(User(name='foo'))
        assert_raises_message(sa.exc.InvalidRequestError,
                              'already flushing', sess.flush)

    def test_before_flush_affects_flush_plan(self):
        users, User = self.tables.users, self.classes.User

        mapper(User, users)

        def before_flush(session, flush_context, objects):
            for obj in list(session.new) + list(session.dirty):
                if isinstance(obj, User):
                    session.add(User(name='another %s' % obj.name))
            for obj in list(session.deleted):
                if isinstance(obj, User):
                    x = session.query(User).filter(
                        User.name == 'another %s' % obj.name).one()
                    session.delete(x)

        sess = Session()
        event.listen(sess, 'before_flush', before_flush)

        u = User(name='u1')
        sess.add(u)
        sess.flush()
        eq_(sess.query(User).order_by(User.name).all(),
            [
                User(name='another u1'),
                User(name='u1')
        ]
        )

        sess.flush()
        eq_(sess.query(User).order_by(User.name).all(),
            [
                User(name='another u1'),
                User(name='u1')
        ]
        )

        u.name = 'u2'
        sess.flush()
        eq_(sess.query(User).order_by(User.name).all(),
            [
                User(name='another u1'),
                User(name='another u2'),
                User(name='u2')
        ]
        )

        sess.delete(u)
        sess.flush()
        eq_(sess.query(User).order_by(User.name).all(),
            [
                User(name='another u1'),
        ]
        )

    def test_before_flush_affects_dirty(self):
        users, User = self.tables.users, self.classes.User

        mapper(User, users)

        def before_flush(session, flush_context, objects):
            for obj in list(session.identity_map.values()):
                obj.name += " modified"

        sess = Session(autoflush=True)
        event.listen(sess, 'before_flush', before_flush)

        u = User(name='u1')
        sess.add(u)
        sess.flush()
        eq_(sess.query(User).order_by(User.name).all(),
            [User(name='u1')]
            )

        sess.add(User(name='u2'))
        sess.flush()
        sess.expunge_all()
        eq_(sess.query(User).order_by(User.name).all(),
            [
                User(name='u1 modified'),
                User(name='u2')
        ]
        )


class MapperExtensionTest(_fixtures.FixtureTest):

    """Superseded by MapperEventsTest - test backwards
    compatibility of MapperExtension."""

    run_inserts = None

    def extension(self):
        methods = []

        class Ext(sa.orm.MapperExtension):

            def instrument_class(self, mapper, cls):
                methods.append('instrument_class')
                return sa.orm.EXT_CONTINUE

            def init_instance(
                    self, mapper, class_, oldinit, instance, args, kwargs):
                methods.append('init_instance')
                return sa.orm.EXT_CONTINUE

            def init_failed(
                    self, mapper, class_, oldinit, instance, args, kwargs):
                methods.append('init_failed')
                return sa.orm.EXT_CONTINUE

            def reconstruct_instance(self, mapper, instance):
                methods.append('reconstruct_instance')
                return sa.orm.EXT_CONTINUE

            def before_insert(self, mapper, connection, instance):
                methods.append('before_insert')
                return sa.orm.EXT_CONTINUE

            def after_insert(self, mapper, connection, instance):
                methods.append('after_insert')
                return sa.orm.EXT_CONTINUE

            def before_update(self, mapper, connection, instance):
                methods.append('before_update')
                return sa.orm.EXT_CONTINUE

            def after_update(self, mapper, connection, instance):
                methods.append('after_update')
                return sa.orm.EXT_CONTINUE

            def before_delete(self, mapper, connection, instance):
                methods.append('before_delete')
                return sa.orm.EXT_CONTINUE

            def after_delete(self, mapper, connection, instance):
                methods.append('after_delete')
                return sa.orm.EXT_CONTINUE

        return Ext, methods

    def test_basic(self):
        """test that common user-defined methods get called."""

        User, users = self.classes.User, self.tables.users

        Ext, methods = self.extension()

        mapper(User, users, extension=Ext())
        sess = create_session()
        u = User(name='u1')
        sess.add(u)
        sess.flush()
        u = sess.query(User).populate_existing().get(u.id)
        sess.expunge_all()
        u = sess.query(User).get(u.id)
        u.name = 'u1 changed'
        sess.flush()
        sess.delete(u)
        sess.flush()
        eq_(methods,
            ['instrument_class', 'init_instance', 'before_insert',
             'after_insert',
             'reconstruct_instance',
             'before_update', 'after_update', 'before_delete', 'after_delete'])

    def test_inheritance(self):
        users, addresses, User = (self.tables.users,
                                  self.tables.addresses,
                                  self.classes.User)

        Ext, methods = self.extension()

        class AdminUser(User):
            pass

        mapper(User, users, extension=Ext())
        mapper(AdminUser, addresses, inherits=User,
               properties={'address_id': addresses.c.id})

        sess = create_session()
        am = AdminUser(name='au1', email_address='au1@e1')
        sess.add(am)
        sess.flush()
        am = sess.query(AdminUser).populate_existing().get(am.id)
        sess.expunge_all()
        am = sess.query(AdminUser).get(am.id)
        am.name = 'au1 changed'
        sess.flush()
        sess.delete(am)
        sess.flush()
        eq_(methods,
            ['instrument_class', 'instrument_class', 'init_instance',
             'before_insert', 'after_insert',
             'reconstruct_instance',
             'before_update', 'after_update', 'before_delete',
             'after_delete'])

    def test_before_after_only_collection(self):
        """before_update is called on parent for collection modifications,
        after_update is called even if no columns were updated.

        """

        keywords, items, item_keywords, Keyword, Item = (
            self.tables.keywords,
            self.tables.items,
            self.tables.item_keywords,
            self.classes.Keyword,
            self.classes.Item)

        Ext1, methods1 = self.extension()
        Ext2, methods2 = self.extension()

        mapper(Item, items, extension=Ext1(), properties={
            'keywords': relationship(Keyword, secondary=item_keywords)})
        mapper(Keyword, keywords, extension=Ext2())

        sess = create_session()
        i1 = Item(description="i1")
        k1 = Keyword(name="k1")
        sess.add(i1)
        sess.add(k1)
        sess.flush()
        eq_(methods1,
            ['instrument_class', 'init_instance',
             'before_insert', 'after_insert'])
        eq_(methods2,
            ['instrument_class', 'init_instance',
             'before_insert', 'after_insert'])

        del methods1[:]
        del methods2[:]
        i1.keywords.append(k1)
        sess.flush()
        eq_(methods1, ['before_update', 'after_update'])
        eq_(methods2, [])

    def test_inheritance_with_dupes(self):
        """Inheritance with the same extension instance on both mappers."""

        users, addresses, User = (self.tables.users,
                                  self.tables.addresses,
                                  self.classes.User)

        Ext, methods = self.extension()

        class AdminUser(User):
            pass

        ext = Ext()
        mapper(User, users, extension=ext)
        mapper(AdminUser, addresses, inherits=User, extension=ext,
               properties={'address_id': addresses.c.id})

        sess = create_session()
        am = AdminUser(name="au1", email_address="au1@e1")
        sess.add(am)
        sess.flush()
        am = sess.query(AdminUser).populate_existing().get(am.id)
        sess.expunge_all()
        am = sess.query(AdminUser).get(am.id)
        am.name = 'au1 changed'
        sess.flush()
        sess.delete(am)
        sess.flush()
        eq_(methods,
            ['instrument_class', 'instrument_class', 'init_instance',
             'before_insert', 'after_insert',
             'reconstruct_instance',
             'before_update', 'after_update', 'before_delete',
             'after_delete'])

    def test_unnecessary_methods_not_evented(self):
        users = self.tables.users

        class MyExtension(sa.orm.MapperExtension):

            def before_insert(self, mapper, connection, instance):
                pass

        class Foo(object):
            pass
        m = mapper(Foo, users, extension=MyExtension())
        assert not m.class_manager.dispatch.load
        assert not m.dispatch.before_update
        assert len(m.dispatch.before_insert) == 1


class AttributeExtensionTest(fixtures.MappedTest):

    @classmethod
    def define_tables(cls, metadata):
        Table('t1',
              metadata,
              Column('id', Integer, primary_key=True),
              Column('type', String(40)),
              Column('data', String(50))

              )

    def test_cascading_extensions(self):
        t1 = self.tables.t1

        ext_msg = []

        class Ex1(sa.orm.AttributeExtension):

            def set(self, state, value, oldvalue, initiator):
                ext_msg.append("Ex1 %r" % value)
                return "ex1" + value

        class Ex2(sa.orm.AttributeExtension):

            def set(self, state, value, oldvalue, initiator):
                ext_msg.append("Ex2 %r" % value)
                return "ex2" + value

        class A(fixtures.BasicEntity):
            pass

        class B(A):
            pass

        class C(B):
            pass

        mapper(
            A, t1, polymorphic_on=t1.c.type, polymorphic_identity='a',
            properties={
                'data': column_property(t1.c.data, extension=Ex1())
            }
        )
        mapper(B, polymorphic_identity='b', inherits=A)
        mapper(C, polymorphic_identity='c', inherits=B, properties={
            'data': column_property(t1.c.data, extension=Ex2())
        })

        a1 = A(data='a1')
        b1 = B(data='b1')
        c1 = C(data='c1')

        eq_(a1.data, 'ex1a1')
        eq_(b1.data, 'ex1b1')
        eq_(c1.data, 'ex2c1')

        a1.data = 'a2'
        b1.data = 'b2'
        c1.data = 'c2'
        eq_(a1.data, 'ex1a2')
        eq_(b1.data, 'ex1b2')
        eq_(c1.data, 'ex2c2')

        eq_(ext_msg, ["Ex1 'a1'", "Ex1 'b1'", "Ex2 'c1'",
                      "Ex1 'a2'", "Ex1 'b2'", "Ex2 'c2'"])


class SessionExtensionTest(_fixtures.FixtureTest):
    run_inserts = None

    def test_extension(self):
        User, users = self.classes.User, self.tables.users

        mapper(User, users)
        log = []

        class MyExt(sa.orm.session.SessionExtension):

            def before_commit(self, session):
                log.append('before_commit')

            def after_commit(self, session):
                log.append('after_commit')

            def after_rollback(self, session):
                log.append('after_rollback')

            def before_flush(self, session, flush_context, objects):
                log.append('before_flush')

            def after_flush(self, session, flush_context):
                log.append('after_flush')

            def after_flush_postexec(self, session, flush_context):
                log.append('after_flush_postexec')

            def after_begin(self, session, transaction, connection):
                log.append('after_begin')

            def after_attach(self, session, instance):
                log.append('after_attach')

            def after_bulk_update(
                self,
                session, query, query_context, result
            ):
                log.append('after_bulk_update')

            def after_bulk_delete(
                self,
                session, query, query_context, result
            ):
                log.append('after_bulk_delete')

        sess = create_session(extension=MyExt())
        u = User(name='u1')
        sess.add(u)
        sess.flush()
        assert log == [
            'after_attach',
            'before_flush',
            'after_begin',
            'after_flush',
            'after_flush_postexec',
            'before_commit',
            'after_commit',
        ]
        log = []
        sess = create_session(autocommit=False, extension=MyExt())
        u = User(name='u1')
        sess.add(u)
        sess.flush()
        assert log == ['after_attach', 'before_flush', 'after_begin',
                       'after_flush', 'after_flush_postexec']
        log = []
        u.name = 'ed'
        sess.commit()
        assert log == ['before_commit', 'before_flush', 'after_flush',
                       'after_flush_postexec', 'after_commit']
        log = []
        sess.commit()
        assert log == ['before_commit', 'after_commit']
        log = []
        sess.query(User).delete()
        assert log == ['after_begin', 'after_bulk_delete']
        log = []
        sess.query(User).update({'name': 'foo'})
        assert log == ['after_bulk_update']
        log = []
        sess = create_session(autocommit=False, extension=MyExt(),
                              bind=testing.db)
        sess.connection()
        assert log == ['after_begin']
        sess.close()

    def test_multiple_extensions(self):
        User, users = self.classes.User, self.tables.users

        log = []

        class MyExt1(sa.orm.session.SessionExtension):

            def before_commit(self, session):
                log.append('before_commit_one')

        class MyExt2(sa.orm.session.SessionExtension):

            def before_commit(self, session):
                log.append('before_commit_two')

        mapper(User, users)
        sess = create_session(extension=[MyExt1(), MyExt2()])
        u = User(name='u1')
        sess.add(u)
        sess.flush()
        assert log == [
            'before_commit_one',
            'before_commit_two',
        ]

    def test_unnecessary_methods_not_evented(self):
        class MyExtension(sa.orm.session.SessionExtension):

            def before_commit(self, session):
                pass

        s = Session(extension=MyExtension())
        assert not s.dispatch.after_commit
        assert len(s.dispatch.before_commit) == 1


class QueryEventsTest(
        _RemoveListeners, _fixtures.FixtureTest, AssertsCompiledSQL):
    __dialect__ = 'default'

    @classmethod
    def setup_mappers(cls):
        User = cls.classes.User
        users = cls.tables.users

        mapper(User, users)

    def test_before_compile(self):
        @event.listens_for(query.Query, "before_compile", retval=True)
        def no_deleted(query):
            for desc in query.column_descriptions:
                if desc['type'] is User:
                    entity = desc['expr']
                    query = query.filter(entity.id != 10)
            return query

        User = self.classes.User
        s = Session()

        q = s.query(User).filter_by(id=7)
        self.assert_compile(
            q,
            "SELECT users.id AS users_id, users.name AS users_name "
            "FROM users "
            "WHERE users.id = :id_1 AND users.id != :id_2",
            checkparams={'id_2': 10, 'id_1': 7}
        )

    def test_alters_entities(self):
        User = self.classes.User

        @event.listens_for(query.Query, "before_compile", retval=True)
        def fn(query):
            return query.add_columns(User.name)

        s = Session()

        q = s.query(User.id, ).filter_by(id=7)
        self.assert_compile(
            q,
            "SELECT users.id AS users_id, users.name AS users_name "
            "FROM users "
            "WHERE users.id = :id_1",
            checkparams={'id_1': 7}
        )
        eq_(
            q.all(),
            [(7, 'jack')]
        )


class RefreshFlushInReturningTest(fixtures.MappedTest):
    """test [ticket:3427].

    this is a rework of the test for [ticket:3167] stated
    in test_unitofworkv2, which tests that returning doesn't trigger
    attribute events; the test here is *reversed* so that we test that
    it *does* trigger the new refresh_flush event.

    """

    __backend__ = True

    @classmethod
    def define_tables(cls, metadata):
        Table(
            'test', metadata,
            Column('id', Integer, primary_key=True,
                   test_needs_autoincrement=True),
            Column('prefetch_val', Integer, default=5),
            Column('returning_val', Integer, server_default="5")
        )

    @classmethod
    def setup_classes(cls):
        class Thing(cls.Basic):
            pass

    @classmethod
    def setup_mappers(cls):
        Thing = cls.classes.Thing

        mapper(Thing, cls.tables.test, eager_defaults=True)

    def test_no_attr_events_flush(self):
        Thing = self.classes.Thing
        mock = Mock()
        event.listen(Thing, "refresh_flush", mock)
        t1 = Thing()
        s = Session()
        s.add(t1)
        s.flush()

        if testing.requires.returning.enabled:
            # ordering is deterministic in this test b.c. the routine
            # appends the "returning" params before the "prefetch"
            # ones.  if there were more than one attribute in each category,
            # then we'd have hash order issues.
            eq_(
                mock.mock_calls,
                [call(t1, ANY, ['returning_val', 'prefetch_val'])]
            )
        else:
            eq_(
                mock.mock_calls,
                [call(t1, ANY, ['prefetch_val'])]
            )

        eq_(t1.id, 1)
        eq_(t1.prefetch_val, 5)
        eq_(t1.returning_val, 5)
