7dc63ccd95
Motivation:
EventExecutor.iterator() is fixed to return Iterator<EventExecutor> and there's no way to change that as long as we don't extend Iterable. However, a user should have a way to cast the returned set of executors painlessly. Currently, it is only possible with an explicit cast like (Iterator<NioEventLoop>).
Modifications:
Instead, I added a new method called 'children()' which returns an immutable collection of child executors whose method signature looks like the following:
<E extends EventExecutor> Set<E> children();
Result:
A user can now do this:
Set<NioEventLoop> loops = group.children();
for (NioEventLoop l: loops) { ... }
Unfortunately, this is not possible:
for (NioEventLoop l: group.children()) { ... }
However, it's still a gain that a user doesn't need to down-cast explicitly and to add the '@SuppressWarnings` annotation.
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