That's cool, so that defines lastValue as a field of the actual closure class?
The issue with using a field is the watch not using the map would fail when
performing multiple watches:
person.watch({skills}....
person.watch({name}...
In those two values, the lastValue field would confuse the state between the
{skills} watch and the {name} watch. Also I didn't want to complicate the
example but in the real implementation the watch is a utility class shared
between many objects and classes and not a closure so my watch state map key is
the watched instance + watch closure class and the map is the field of a real
class. In real a scripting DSL example I would have probably added watch to
Object metaclass which delegates to a WatchManager implementation.
Jason
-----Original Message-----
From: Jochen Theodorou [mailto:blackd...@gmx.org]
Sent: Thursday, April 13, 2017 11:39 AM
To: users@groovy.apache.org
Subject: Re: How to determine the equality of two closures?
Jason, have you ever trief something like this?
> person.watch = { cond, action, elseAction ->
> def value = person.with(cond).clone()
> @groovy.transform.Field lastValue
> if (value != lastValue) action(lastValue, value) else elseAction()
> lastValue = value
> }
bye Jochen
This email message and any attachments are for the sole use of the intended
recipient(s). Any unauthorized review, use, disclosure or distribution is
prohibited. If you are not the intended recipient, please contact the sender by
reply email and destroy all copies of the original message and any attachments.
