def some_bigger_function():
db_set(1, 'something')
value = simple_function1()
db_set(2, 'something else')
#### now we know we used 2 cached functions so....
invalidate('key1')
invalidate('key2')
#### now we know we are safe, but for a price
return simple_function2()
@cached("key1")
def simple_function1():
return db_get(id=1)
@cached("key2")
def simple_function2():
return db_get(id=2)
# SUPPOSE THIS IS IN ANOTHER MODULE
@cached("key")
def some_bigger_function():
return {"1": simple_function1(), "2": simple_function2(), "3": db_get(id=3)}
if __name__ == "__main__":
simple_function1()
# somewhere else
db_set(1, "foobar")
# and again
db_set(3, "bazbar")
invalidate("key")
# ooops, we forgot something
data = some_bigger_function()
assert data["1"] == db_get(id=1), "this fails because we didn't manage to invalidate all the keys"
