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import asyncio
import threading
import time
import param
import pytest
from param.parameterized import Skip, resolve_ref
from param.reactive import bind, rx
class Parameters(param.Parameterized):
string = param.String(default="string", allow_refs=True)
dictionary = param.Dict(default={}, allow_refs=True, nested_refs=True)
string_list = param.List(default=[], item_type=str, allow_refs=True, nested_refs=True)
no_refs = param.Parameter(allow_refs=False)
@param.depends('string')
def formatted_string(self):
if self.string.endswith('?'):
raise Skip()
return self.string + '!'
@param.depends('string')
def formatted_string_skip_return(self):
if self.string.endswith('?'):
return Skip
return self.string + '!'
class Subclass(Parameters):
no_refs = param.Parameter()
class SubclassOverride(Parameters):
no_refs = param.Parameter(allow_refs=True)
class Nested(param.Parameterized):
subobject = param.ClassSelector(class_=Parameters)
@param.depends('subobject.string')
def string(self):
return self.subobject.string + '!'
def test_class_explicit_no_refs():
assert Parameters._param__private.explicit_no_refs == ['no_refs']
def test_subclass_explicit_no_refs():
assert Subclass._param__private.explicit_no_refs == ['no_refs']
def test_subclass_explicit_no_refs_override():
assert SubclassOverride._param__private.explicit_no_refs == []
def test_parameterized_warns_explicit_no_ref():
class ImplicitRefsParameters(param.Parameterized):
parameter = param.Parameter(default="string")
p = Parameters()
with pytest.raises(Exception) as e:
ImplicitRefsParameters(parameter=p.param.string)
assert f"Parameter 'parameter' on {ImplicitRefsParameters} is being given a valid parameter reference <param.parameterized.String" in str(e.value)
def test_parameter_ref():
p = Parameters()
p2 = Parameters(string=p.param.string)
assert p.string == p2.string
p.string = 'new_string'
assert p2.string == 'new_string'
def test_parameter_ref_update():
p = Parameters()
p2 = Parameters(string=p.param.string)
p3 = Parameters(string='new string')
p2.string = p3.param.string
assert p2.string == 'new string'
p.string = 'still linked'
assert p2.string != 'still linked'
p3.string = 'newly linked'
assert p2.string == 'newly linked'
def test_parameter_ref_update_context():
p = Parameters(string='linked')
p2 = Parameters(string=p.param.string)
assert p2.string == 'linked'
with p2.param.update(string='override'):
assert p2.string == 'override'
p.string = 'not yet linked'
assert p2.string == 'override'
assert p2.string == 'not yet linked'
p.string = 'relinked'
assert p2.string == 'relinked'
def test_bind_ref():
p = Parameters()
p2 = Parameters(string=bind(lambda x: x + '!', p.param.string))
assert p2.string == 'string!'
p.string = 'new string'
assert p2.string == 'new string!'
def test_bind_ref_skip():
p = Parameters()
def skip_fn(s):
if s == 'invalid':
raise Skip()
return s + '!'
p2 = Parameters(string=bind(skip_fn, p.param.string))
assert p2.string == 'string!'
p.string = 'new string'
assert p2.string == 'new string!'
p.string = 'invalid'
assert p2.string == 'new string!'
def test_reactive_ref():
string = rx('string')
rx_string = string+'!'
p = Parameters(string=rx_string)
assert p.string == 'string!'
string.rx.value = 'new string'
assert p.string == 'new string!'
def test_nested_list_parameter_ref():
p = Parameters()
p2 = Parameters(string_list=[p.param.string, 'other'])
p3 = Parameters(string='foo')
assert p2.string_list == ['string', 'other']
p2.string_list = [p3.param.string, 'another']
assert p2.string_list == ['foo', 'another']
def test_nested_dict_key_parameter_ref():
p = Parameters()
p2 = Parameters(dictionary={p.param.string: 'value'})
p3 = Parameters(string='foo')
assert p2.dictionary == {'string': 'value'}
p2.dictionary = {p3.param.string: 'new_value'}
assert p2.dictionary == {'foo': 'new_value'}
def test_nested_dict_value_parameter_ref():
p = Parameters()
p2 = Parameters(dictionary={'key': p.param.string})
p3 = Parameters(string='foo')
assert p2.dictionary == {'key': 'string'}
p2.dictionary = {'new key': p3.param.string}
assert p2.dictionary == {'new key': 'foo'}
def test_nested_param_method_ref():
p = Parameters()
nested = Nested(subobject=p)
p2 = Parameters(string=nested.string)
assert p2.string == 'string!'
p.string = 'new string'
assert p2.string == 'new string!'
def test_nested_param_method_skip():
p = Parameters()
p2 = Parameters(string=p.formatted_string)
assert p2.string == 'string!'
p.string = 'new string?'
assert p2.string == 'string!'
def test_nested_param_method_skip_return():
p = Parameters()
p2 = Parameters(string=p.formatted_string_skip_return)
assert p2.string == 'string!'
p.string = 'new string?'
assert p2.string == 'string!'
async def test_async_function_ref():
async def gen_strings():
await asyncio.sleep(0.02)
return 'string!'
p = Parameters(string=gen_strings)
await asyncio.sleep(0.1)
assert p.string == 'string!'
async def test_async_bind_ref():
p = Parameters()
async def exclaim(string):
await asyncio.sleep(0.05)
return string + '!'
p2 = Parameters(string=bind(exclaim, p.param.string))
await asyncio.sleep(0.1)
assert p2.string == 'string!'
p.string = 'new string'
await asyncio.sleep(0.1)
assert p2.string == 'new string!'
async def test_async_generator_ref():
async def gen_strings():
yield 'string?'
await asyncio.sleep(0.02)
yield 'string!'
p = Parameters(string=gen_strings)
await asyncio.sleep(0.01)
assert p.string == 'string?'
await asyncio.sleep(0.1)
assert p.string == 'string!'
async def test_generator_ref():
def gen_strings():
yield 'string?'
time.sleep(0.05)
yield 'string!'
p = Parameters(string=gen_strings)
await asyncio.sleep(0.02)
assert p.string == 'string?'
for _ in range(5):
await asyncio.sleep(0.05)
if p.string == 'string!':
break
assert p.string == 'string!'
async def test_async_generator_ref_cancelled():
tasks = []
async def gen_strings1():
tasks.append(asyncio.current_task())
i = 0
while True:
yield str(i)
await asyncio.sleep(0.01)
async def gen_strings2():
tasks.append(asyncio.current_task())
i = 0
while True:
yield str(i)
await asyncio.sleep(0.01)
p = Parameters(string=gen_strings1)
await asyncio.sleep(0.02)
assert p.string is not None
p.string = gen_strings2
await asyncio.sleep(0.02)
assert len(tasks) == 2
task1, task2 = tasks
assert task1.done()
assert not task2.done()
assert p._param__private.async_refs['string'] is task2
async def test_generator_ref_cancelled():
threads = []
def gen_strings1():
threads.append(threading.current_thread())
i = 0
while True:
yield str(i)
time.sleep(0.01)
def gen_strings2():
threads.append(threading.current_thread())
i = 0
while True:
yield str(i)
time.sleep(0.01)
p = Parameters(string=gen_strings1)
await asyncio.sleep(0.02)
task1 = p._param__private.async_refs['string']
assert p.string is not None
p.string = gen_strings2
await asyncio.sleep(0.02)
task2 = p._param__private.async_refs['string']
assert task1 is not task2
assert task1.done()
assert not task2.done()
assert len(threads) == 2
def test_resolve_ref_parameter():
p = Parameters()
refs = resolve_ref(p.param.string)
assert len(refs) == 1
assert refs[0] is p.param.string
def test_resolve_ref_depends_method():
p = Parameters()
refs = resolve_ref(p.formatted_string)
assert len(refs) == 1
assert refs[0] is p.param.string
def test_resolve_ref_recursive_list():
p = Parameters()
nested = [[p.param.string]]
refs = resolve_ref(nested, recursive=True)
assert len(refs) == 1
assert refs[0] is p.param.string
def test_resolve_ref_recursive_set():
p = Parameters()
nested = {(p.param.string,)} # Parameters aren't hashable
refs = resolve_ref(nested, recursive=True)
assert len(refs) == 1
assert refs[0] is p.param.string
def test_resolve_ref_recursive_tuple():
p = Parameters()
nested = ((p.param.string,),)
refs = resolve_ref(nested, recursive=True)
assert len(refs) == 1
assert refs[0] is p.param.string
def test_resolve_ref_recursive_dict():
p = Parameters()
nested = {'0': {'0': p.param.string}}
refs = resolve_ref(nested, recursive=True)
assert len(refs) == 1
assert refs[0] is p.param.string
def test_resolve_ref_recursive_slice():
p = Parameters()
nested = [slice(p.param.string)]
refs = resolve_ref(nested, recursive=True)
assert len(refs) == 1
assert refs[0] is p.param.string
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