mirror of
https://github.com/sqlalchemy/sqlalchemy.git
synced 2026-05-10 02:39:59 -04:00
Mike Bayer
065fcbd9d2
relationship(), to eliminate confusion over the relational algebra term. relation() however will remain available in equal capacity for the foreseeable future. [ticket:1740]
76 lines
1.7 KiB
Python
76 lines
1.7 KiB
Python
"""test that mapper compilation is threadsafe, including
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when additional mappers are created while the existing
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collection is being compiled."""
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from sqlalchemy import *
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from sqlalchemy.orm import *
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import thread, time
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from sqlalchemy.orm import mapperlib
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meta = MetaData('sqlite:///foo.db')
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t1 = Table('t1', meta,
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Column('c1', Integer, primary_key=True),
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Column('c2', String(30))
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)
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t2 = Table('t2', meta,
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Column('c1', Integer, primary_key=True),
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Column('c2', String(30)),
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Column('t1c1', None, ForeignKey('t1.c1'))
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)
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t3 = Table('t3', meta,
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Column('c1', Integer, primary_key=True),
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Column('c2', String(30)),
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)
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meta.create_all()
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class T1(object):
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pass
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class T2(object):
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pass
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class FakeLock(object):
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def acquire(self):pass
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def release(self):pass
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# uncomment this to disable the mutex in mapper compilation;
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# should produce thread collisions
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#mapperlib._COMPILE_MUTEX = FakeLock()
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def run1():
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for i in range(50):
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print "T1", thread.get_ident()
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class_mapper(T1)
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time.sleep(.05)
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def run2():
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for i in range(50):
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print "T2", thread.get_ident()
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class_mapper(T2)
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time.sleep(.057)
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def run3():
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for i in range(50):
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def foo():
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print "FOO", thread.get_ident()
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class Foo(object):pass
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mapper(Foo, t3)
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class_mapper(Foo).compile()
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foo()
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time.sleep(.05)
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mapper(T1, t1, properties={'t2':relationship(T2, backref="t1")})
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mapper(T2, t2)
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print "START"
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for j in range(0, 5):
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thread.start_new_thread(run1, ())
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thread.start_new_thread(run2, ())
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thread.start_new_thread(run3, ())
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thread.start_new_thread(run3, ())
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thread.start_new_thread(run3, ())
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print "WAIT"
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time.sleep(5)
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