Github user aledsage commented on the issue:
https://github.com/apache/brooklyn-server/pull/282
+1 to suggestion from @neykov - having `attributeWhenReady` and `attribute`
is extremely confusing. I initially expected your `attribute` DSL function to
give me the immediate value, rather than blocking at all.
@grkvlt This is one for the mailing list as it will break backwards
compatibility. Some people currently rely on
`attribueWhenReady("service.isUp")` to wait for true.
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