def test_get_callback(pvnames, simulator):
print("Callback test: changing PV must be updated\n")
mypv = PV(pvnames.updating_pv1)
NEWVALS = []
def onChanges(pvname=None, value=None, char_value=None, **kw):
nonlocal NEWVALS
print('PV %s %s, %s Changed!\n' % (pvname, repr(value), char_value))
NEWVALS.append(repr(value))
mypv.add_callback(onChanges)
print('Added a callback. Now wait for changes...\n')
t0 = time.time()
while time.time() - t0 < 3:
time.sleep(1.e-4)
print(' saw %i changes.\n' % len(NEWVALS))
assert len(NEWVALS) > 3
mypv.clear_callbacks()
def test_waveform_callback_with_count_arg(pvnames, simulator):
values = []
wf = PV(pvnames.char_arr_pv, count=32)
def onChanges(pvname=None, value=None, char_value=None, **kw):
print('PV %s %s, %s Changed!\n' % (pvname, repr(value), char_value))
values.append(value)
wf.add_callback(onChanges)
print('Added a callback. Now wait for changes...\n')
t0 = time.time()
while time.time() - t0 < 3:
time.sleep(1.e-4)
if len(values) > 0:
break
assert len(values) > 0
assert len(values[0]) == 32
wf.clear_callbacks()
