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On Fri, 9 Jun 2023 12:00:06 GMT, John Hendrikx <jhendr...@openjdk.org> wrote:
>> This provides and uses a new implementation of `ExpressionHelper`, called `ListenerManager` with improved semantics. >> >> # Behavior >> >> |Listener...|ExpressionHelper|ListenerManager| >> |---|---|---| >> |Invocation Order|In order they were registered, invalidation listeners always before change listeners|(unchanged)| >> |Removal during Notification|All listeners present when notification started are notified, but excluded for any nested changes|Listeners are removed immediately regardless of nesting| >> |Addition during Notification|Only listeners present when notification started are notified, but included for any nested changes|New listeners are never called during the current notification regardless of nesting| >> >> ## Nested notifications: >> >> | |ExpressionHelper|ListenerManager| >> |---|---|---| >> |Type|Depth first (call stack increases for each nested level)|(same)| >> |# of Calls|Listeners * Depth (using incorrect old values)|Collapses nested changes, skipping non-changes| >> |Vetoing Possible?|No|Yes| >> |Old Value correctness|Only for listeners called before listeners making nested changes|Always| >> >> # Performance >> >> |Listener|ExpressionHelper|ListenerManager| >> |---|---|---| >> |Addition|Array based, append in empty slot, resize as needed|(same)| >> |Removal|Array based, shift array, resize as needed|(same)| >> |Addition during notification|Array is copied, removing collected WeakListeners in the process|Appended when notification finishes| >> |Removal during notification|As above|Entry is `null`ed (to avoid moving elements in array that is being iterated)| >> |Notification completion with changes|-|Null entries (and collected WeakListeners) are removed| >> |Notifying Invalidation Listeners|1 ns each|(same)| >> |Notifying Change Listeners|1 ns each (*)|2-3 ns each| >> >> (*) a simple for loop is close to optimal, but unfortunately does not provide correct old values >> >> # Memory Use >> >> Does not include alignment, and assumes a 32-bit VM or one that is using compressed oops. >> >> |Listener|ExpressionHelper|ListenerManager|OldValueCaching ListenerManager| >> |---|---|---|---| >> |No Listeners|none|none|none| >> |Single InvalidationListener|16 bytes overhead|none|none| >> |Single ChangeListener|20 bytes overhead|none|16 bytes overhead| >> |Multiple listeners|57 + 4 per listener (excluding unused slots)|57 + 4 per listener (excluding unused slots)|61 + 4 per listener (excluding unused slots)| >> >> # About nested changes >> >> Nested changes are simply changes... > > John Hendrikx has updated the pull request incrementally with one additional commit since the last revision: > > Fix generic warnings Tested with a big application, did not find any regression. All listeners still work as expected, tested especially a lot of 'if something is selected, this button should be enabled/disabled' and the like. I did not checked the code yet, just a little bit. One question: Should I test something special/do you see a case which could cause a problem here? ------------- PR Comment: https://git.openjdk.org/jfx/pull/1081#issuecomment-1986169590
