> On May 8, 2020, at 1:11 PM, Kirk Lund wrote:
>
> I want to avoid having Java Interfaces in which every method (or even many
> methods) has a default empty implementation. I think that's ok for callback
> interfaces like CacheListener, but it's horrible for interfaces like Cache,
> Region, Int
I want to avoid having Java Interfaces in which every method (or even many
methods) has a default empty implementation. I think that's ok for callback
interfaces like CacheListener, but it's horrible for interfaces like Cache,
Region, InternalCache, InternalRegion. I don't think these non-callback
> *appropriate when the new method can be defined in terms of other
existing methods in the interface*
This is what it means when a method employs the "template" design pattern.
Correction to my (earlier) example:
@FunctionalInterace
interface Sorter {
default Object[] sort(Object... array
Default interface methods are especially appropriate when the new method can be
defined in terms of other existing methods in the interface. For examples,
when Collections added isEmpty(), it is basically just a shorthand for
length()==0 [but certain subclasses might still be able to provide a
Another way to think about this is:
1. First, default methods are not inherently bad. They are useful in many
situations and can be "overridden" on implementing classes, if necessary.
2. A default method should be provided when the operation is not strictly
required or if the implementation (proce
As a general rule default implementations on an interface should only used when
absolutely necessary because all the implementations are out of your control.
For example, the collection interfaces in the JDK all gained new APIs but Java
doesn’t implement every instance of them so a default is ne
I believe some of the Geode community has already decided that we shouldn't
overuse default methods in interfaces. Dan and others were the ones who
decided this and thus I can't really explain to folks in PRs why it's bad
to overuse default methods. Could some of the folks with strong
understanding
