Github user neykov commented on the pull request:
https://github.com/apache/incubator-brooklyn/pull/1018#issuecomment-155780641
So we need to resolve external values at `getConfig` time, but at the same
time allow mutations of the properties. What if you patch the config in the
`AbstractManagementContext` constructor, but lazily - here's what I mean. In
the constructor wrap the properties in a delegate, including a reference to the
mgmt context. On `get`s check the value and if needed resolve. Alternatively
convert any external values to suppliers, resolving on `get` (i.e. make
`BrooklynProperties` handle suppliers).
It's obviously hackish to mutate the `ManagementContext.getConfig()` -
might be a good reason to find a generic way to do it, but out of scope for
this.
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