Github user aledsage commented on a diff in the pull request:
https://github.com/apache/brooklyn-server/pull/565#discussion_r104391702
--- Diff:
core/src/main/java/org/apache/brooklyn/core/objs/AbstractConfigurationSupportInternal.java
---
@@ -139,17 +132,19 @@ public T call() {
// or Absent if the config key was unset.
Object unresolved = getRaw(key).or(key.getDefaultValue());
final Object marker = new Object();
- // Give tasks a short grace period to resolve.
- Object resolved = Tasks.resolving(unresolved)
+ Maybe<Object> resolved = Tasks.resolving(unresolved)
.as(Object.class)
.defaultValue(marker)
.immediately(true)
.deep(true)
.context(getContext())
- .get();
- return (resolved != marker)
- ? TypeCoercions.tryCoerce(resolved, key.getTypeToken())
- : Maybe.<T>absent();
+ .getMaybe();
+ if (resolved.isAbsent()) return
Maybe.Absent.<T>castAbsent(resolved);
+ if (resolved.get()==marker) {
+ // TODO changed Feb 2017, previously returned absent, in
contrast to what the javadoc says
--- End diff --
I don't think this code will ever be called. The `.defaultValue(marker)`
only affects the behaviour of `.get()`. It doesn't affect the result of
`.getMaybe()`, so we'll never have the marker object returned (now that you've
changed it to use `getMaybe()`).
I'm fine with us leaving this in for your PR, but I'd be interested what
situation you're trying to cover with this. I tried writing a few more tests
but could never get into this code path.
My understanding of what it was doing previously... By setting the
`defaultValue(marker)` and calling `get()`, it was trying to avoid the
exception being thrown when `getMaybe()` would have return an absent (so
instead it returned us the marker). That would seem to agree with the javadoc
(which javadoc are you referring to?).
However, I agree that your change to call `getMaybe()` instead is much
nicer - we get to keep the original `Maybe.absent()` value has the better
explanation of why it's absent.
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