Github user neykov commented on a diff in the pull request: https://github.com/apache/brooklyn-server/pull/462#discussion_r94960067 --- Diff: core/src/main/java/org/apache/brooklyn/core/objs/BasicSpecParameter.java --- @@ -404,7 +431,126 @@ public static void addParameters(AbstractBrooklynObjectSpec<?, ?> spec, List<? e spec.parametersAdd(BasicSpecParameter.fromSpec(loader.getManagementContext(), spec)); } if (explicitParams.size() > 0) { - spec.parametersAdd(explicitParams); + spec.parametersReplace(resolveParameters(explicitParams, spec.getParameters(), spec)); + } + } + + /** merge parameters against other parameters and known and type-inherited config keys */ + static Collection<SpecParameter<?>> resolveParameters(Collection<? extends SpecParameter<?>> newParams, Collection<? extends SpecParameter<?>> existingReferenceParamsToKeep, AbstractBrooklynObjectSpec<?,?> spec) { + Map<String,SpecParameter<?>> existingToKeep = MutableMap.of(); + if (existingReferenceParamsToKeep!=null) { + for (SpecParameter<?> p: existingReferenceParamsToKeep) { + existingToKeep.put(p.getConfigKey().getName(), p); + } + } + + List<SpecParameter<?>> result = MutableList.<SpecParameter<?>>of(); + for (SpecParameter<?> p: newParams) { + if (p instanceof SpecParameterForInheritance) { + SpecParameter<?> existingP = existingToKeep.remove(p.getConfigKey().getName()); + if (existingP!=null) { + p = ((SpecParameterForInheritance<?>)p).resolveWithAncestor(existingP); + } else { + // TODO find config keys on the type (not available as parameters) --- End diff -- Suggest we introduce support for both cases at the same time to avoid confusion of when the inheritance works and when it doesn't.
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