def test_writer_instance_handle():
dp = DomainParticipant(0)
tp = Topic(dp, "MessageKeyed", MessageKeyed)
pub = Publisher(dp)
dw = DataWriter(pub, tp)
msg = MessageKeyed(user_id=1, message="Hello")
handle = dw.register_instance(msg)
assert handle > 0
dw.write(msg)
dw.unregister_instance_handle(handle)
def test_writer_lookup():
dp = DomainParticipant(0)
tp = Topic(dp, "MessageKeyed", MessageKeyed)
pub = Publisher(dp)
dw = DataWriter(pub, tp)
keymsg1 = MessageKeyed(user_id=1000, message="Hello!")
keymsg2 = MessageKeyed(user_id=2000, message="Hello!")
assert None == dw.lookup_instance(keymsg1)
assert None == dw.lookup_instance(keymsg2)
handle1 = dw.register_instance(keymsg1)
handle2 = dw.register_instance(keymsg2)
assert handle1 > 0 and handle2 > 0 and handle1 != handle2
assert handle1 == dw.lookup_instance(keymsg1)
assert handle2 == dw.lookup_instance(keymsg2)
