Hi John,

The goal is not to end the discussion!

It's a trade off. Mailing lists are good because they provide a threaded discussion. JIRA is bad because it is not threaded. JIRA has the advantage that it captures data in a single place and provides a good history of why a decision was made.

There's no right answer here but the policy that the FX committers is using is to try to capture as much as possible in JIRA.


On 2014-01-22 5:29 PM, John Hendrikx wrote:
Unfortunately, "discussing" things in JIRA works very poorly and is a good way to end a productive discussion IMHO. Mailinglists are much better suited to the task, as thousands of interesting mailinglists accross many developer communities will atest to.

Keeping a record is good, aren't these mailinglists archived?


On 22/01/2014 18:47, Daniel Blaukopf wrote:
Hi Martin, Randahl, Tom, Richard, Tomas and Ali,

This is a productive discussion, but once we get to this level of detail JIRA is the place to have it, so that we don’t lose our record of it. Would you continue the discussion on https://javafx-jira.kenai.com/browse/RT-25613 ?

See https://wiki.openjdk.java.net/display/OpenJFX/Code+Reviews#CodeReviews-TechnicalDiscussionsandCodeReviews


On Jan 22, 2014, at 7:23 PM, Stephen F Northover<steve.x.northo...@oracle.com> wrote:

If we add this API, I like addListener(InvalidationListener, boolean) better than ensureListener().


On 2014-01-22 8:20 AM, Ali Ebrahimi wrote:
I suggest adding another overload for addListener method taking boolean
parameter  "duplicateAllowed" or "duplicateNotAllowed".

On Wed, Jan 22, 2014 at 3:00 PM, Richard Bair<richard.b...@oracle.com>wrote:

The default implementation (for Observable) would look like this:

public default void ensureListener(InvalidationListener listener) {

subclasses might do something more effective. The same would apply to
ObservableValue and ChangeListener and Observable[List|Set|Map] and
Well this would destroy the order! I expect listeners to be called in
the correct order not?
That’s a good point :-(

Why doing a remove and not simply check if the
listener has already been added?
Because there is no way to check, except in the implementation. From the Observable interface level, there is no way to a) force all implementations of the interface to implement the method correctly (without breaking source compatibility anyway), or b) to provide a reasonable default implementation.

Maybe this is one of those things we can’t fix on the Observable interface and just have to provide implementations of on our concrete properties.


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