def test_soft_derived():
timestamp = 1.0
value = 'q'
original = Signal(name='original', timestamp=timestamp, value=value)
cb_values = []
def callback(value=None, **kwargs):
cb_values.append(value)
derived = DerivedSignal(derived_from=original, name='derived')
derived.subscribe(callback, event_type=derived.SUB_VALUE)
assert derived.timestamp == timestamp
assert derived.get() == value
assert derived.timestamp == timestamp
assert derived.describe()[derived.name]['derived_from'] == original.name
assert derived.write_access == original.write_access
assert derived.read_access == original.read_access
new_value = 'r'
derived.put(new_value)
assert original.get() == new_value
assert derived.get() == new_value
assert derived.timestamp == original.timestamp
assert derived.limits == original.limits
copied = copy.copy(derived)
with pytest.warns(UserWarning):
assert copied.derived_from.value == original.value
assert copied.derived_from.timestamp == original.timestamp
assert copied.derived_from.name == original.name
derived.put('s')
assert cb_values == ['r', 's']
called = []
event = threading.Event()
def meta_callback(*, connected, read_access, write_access, **kw):
called.append(('meta', connected, read_access, write_access))
event.set()
derived.subscribe(meta_callback, event_type=derived.SUB_META, run=False)
original._metadata['write_access'] = False
original._run_subs(sub_type='meta', **original._metadata)
event.wait(1)
assert called == [('meta', True, True, False)]
def test_soft_derived():
timestamp = 1.0
value = 'q'
original = Signal(name='original', timestamp=timestamp, value=value)
cb_values = []
def callback(value=None, **kwargs):
cb_values.append(value)
derived = DerivedSignal(derived_from=original, name='derived')
derived.subscribe(callback, event_type=derived.SUB_VALUE)
assert derived.timestamp == timestamp
assert derived.get() == value
assert derived.timestamp == timestamp
assert derived.describe()[derived.name]['derived_from'] == original.name
assert derived.write_access == original.write_access
assert derived.read_access == original.read_access
new_value = 'r'
derived.put(new_value)
assert original.get() == new_value
assert derived.get() == new_value
assert derived.timestamp == original.timestamp
assert derived.limits == original.limits
copied = copy.copy(derived)
assert copied.derived_from.value == original.value
assert copied.derived_from.timestamp == original.timestamp
assert copied.derived_from.name == original.name
derived.put('s')
assert cb_values == ['r', 's']
called = []
event = threading.Event()
def meta_callback(*, connected, read_access, write_access, **kw):
called.append(('meta', connected, read_access, write_access))
event.set()
derived.subscribe(meta_callback, event_type=derived.SUB_META, run=False)
original._metadata['write_access'] = False
original._run_subs(sub_type='meta', **original._metadata)
event.wait(1)
assert called == [('meta', True, True, False)]
