Github user aledsage commented on a diff in the pull request:
https://github.com/apache/brooklyn-server/pull/340#discussion_r80060372
--- Diff:
core/src/main/java/org/apache/brooklyn/core/config/internal/AbstractConfigMapImpl.java
---
@@ -107,4 +264,264 @@ public int size() {
public boolean isEmpty() {
return ownConfig.isEmpty();
}
+
+ protected ConfigInheritance getDefaultRuntimeInheritance() {
+ return BasicConfigInheritance.OVERWRITE;
+ }
+
+ @Override
+ public <T> ReferenceWithError<ConfigValueAtContainer<TContainer,T>>
getConfigAndContainer(ConfigKey<T> key) {
+ return getConfigImpl(key, false);
+ }
+
+ protected abstract TContainer getParentOfContainer(TContainer
container);
+
+
+ @Nullable protected final <T> ConfigKey<T>
getKeyAtContainer(TContainer container, ConfigKey<T> queryKey) {
+ if (container==null) return null;
+ @SuppressWarnings("unchecked")
+ ConfigKey<T> candidate = (ConfigKey<T>)
getKeyAtContainerImpl(container, queryKey);
+ return candidate;
+ }
+
+ @Nullable protected abstract <T> ConfigKey<?>
getKeyAtContainerImpl(@Nonnull TContainer container, ConfigKey<T> queryKey);
+ protected abstract Collection<ConfigKey<?>>
getKeysAtContainer(@Nonnull TContainer container);
+
+ protected Maybe<Object> getRawValueAtContainer(TContainer container,
ConfigKey<? extends Object> configKey) {
+ return
((BrooklynObjectInternal)container).config().getInternalConfigMap().getConfigLocalRaw(configKey);
+ }
+ /** finds the value at the given container/key, taking in to account
any resolution expected by the key (eg for map keys).
+ * the input is the value in the {@link #ownConfig} map taken from
{@link #getRawValueAtContainer(BrooklynObject, ConfigKey)},
+ * but the key may have other plans.
+ * current impl just uses the key to extract again which is a little
bit wasteful but simpler.
+ * <p>
+ * this does not do any resolution with respect to ancestors. */
+ protected Maybe<Object> resolveRawValueFromContainer(TContainer
container, ConfigKey<?> key, Object value) {
+ Map<ConfigKey<?>, Object> oc = ((AbstractConfigMapImpl<?>)
((BrooklynObjectInternal)container).config().getInternalConfigMap()).ownConfig;
+ if (key instanceof ConfigKeySelfExtracting) {
+ if (((ConfigKeySelfExtracting<?>)key).isSet(oc)) {
+ Map<ConfigKey<?>, ?> ownCopy;
+ synchronized (oc) {
+ // wasteful to make a copy to look up; maybe try once
opportunistically?
+ ownCopy = MutableMap.copyOf(oc);
+ }
+ return Maybe.of((Object) ((ConfigKeySelfExtracting<?>)
key).extractValue(ownCopy, getExecutionContext(container)) );
+ } else {
+ return Maybe.absent();
+ }
+ } else {
+ // all our keys are self-extracting
+ LOG.warn("Unexpected key type "+key+" ("+key.getClass()+") in
"+bo+"; ignoring value");
+ return Maybe.absent();
+ }
+ }
+
+ @SuppressWarnings("unchecked")
+ protected <T> T coerce(Object value, Class<T> type) {
+ if (type==null || value==null) return (T) value;
+ return (T) TypeCoercions.coerce(value, type);
+ }
+
+ protected <T> ReferenceWithError<ConfigValueAtContainer<TContainer,T>>
getConfigImpl(final ConfigKey<T> queryKey, final boolean raw) {
+ // In case this entity class has overridden the given key (e.g. to
set default), then retrieve this entity's key
+ Function<TContainer, ConfigKey<T>> keyFn = new
Function<TContainer, ConfigKey<T>>() {
+ @Override public ConfigKey<T> apply(TContainer input) {
+ // should return null if the key is not known, to indicate
selected inheritance rules from base key should take effect
+ return getKeyAtContainer(input, queryKey);
+ }
+ };
+ ConfigKey<T> ownKey = keyFn.apply(getContainer());
+ if (ownKey==null) ownKey = queryKey;
+ @SuppressWarnings("unchecked")
+ final Class<T> type = (Class<T>) ownKey.getType();
+
+ // takes type of own key (or query key if own key not available)
+ // takes default of own key if available and has default, else of
query key
+
+ Function<Maybe<Object>, Maybe<T>> coerceFn = new
Function<Maybe<Object>, Maybe<T>>() {
+ @SuppressWarnings("unchecked") @Override public Maybe<T>
apply(Maybe<Object> input) {
+ if (raw || input==null || input.isAbsent()) return
(Maybe<T>)input;
+ return Maybe.ofAllowingNull(coerce(input.get(), type));
+ }
+ };
+ // prefer default and type of ownKey
+ Maybe<T> defaultValue = raw ? Maybe.<T>absent() :
+ ownKey.hasDefaultValue() ?
coerceFn.apply(Maybe.of((Object)ownKey.getDefaultValue())) :
+ queryKey.hasDefaultValue() ?
coerceFn.apply(Maybe.of((Object)queryKey.getDefaultValue())) :
+ Maybe.<T>absent();
+
+ if (ownKey instanceof ConfigKeySelfExtracting) {
+
+ Function<TContainer, Maybe<Object>> lookupFn = new
Function<TContainer, Maybe<Object>>() {
+ @Override public Maybe<Object> apply(TContainer input) {
+ Maybe<Object> result = getRawValueAtContainer(input,
queryKey);
+ if (!raw) result = resolveRawValueFromContainer(input,
queryKey, result);
+ return result;
+ }
+ };
+ Function<TContainer, TContainer> parentFn = new
Function<TContainer, TContainer>() {
+ @Override public TContainer apply(TContainer input) {
+ return getParentOfContainer(input);
+ }
+ };
+ AncestorContainerAndKeyValueIterator<TContainer, T> ckvi = new
AncestorContainerAndKeyValueIterator<TContainer,T>(
+ getContainer(), keyFn, lookupFn, coerceFn, parentFn);
+
+ return ConfigInheritances.resolveInheriting(
+ getContainer(), ownKey,
coerceFn.apply(lookupFn.apply(getContainer())), defaultValue,
+ ckvi, InheritanceContext.RUNTIME_MANAGEMENT,
getDefaultRuntimeInheritance());
+
+ } else {
+ String message = "Config key "+ownKey+" of
"+getBrooklynObject()+" is not a ConfigKeySelfExtracting; cannot retrieve
value; returning default";
+ LOG.warn(message);
+ return ReferenceWithError.newInstanceThrowingError(new
BasicConfigValueAtContainer<TContainer,T>(getContainer(), ownKey, null, false,
+ defaultValue),
+ new IllegalStateException(message));
+ }
+ }
+
+ @Override
+ public List<ConfigValueAtContainer<TContainer,?>>
getConfigAllInheritedRaw(ConfigKey<?> queryKey) {
+ List<ConfigValueAtContainer<TContainer, ?>> result =
MutableList.of();
+ TContainer c = getContainer();
+ int count=0;
+
+ final InheritanceContext context =
InheritanceContext.RUNTIME_MANAGEMENT;
+ ConfigInheritance currentInheritance =
ConfigInheritances.findInheritance(queryKey, context,
getDefaultRuntimeInheritance());
+
+ BasicConfigValueAtContainer<TContainer, Object> last = null;
+
+ while (c!=null) {
+ Maybe<Object> v = getRawValueAtContainer(c, queryKey);
+ BasicConfigValueAtContainer<TContainer, Object> next = new
BasicConfigValueAtContainer<TContainer, Object>(c, getKeyAtContainer(c,
queryKey), v);
+
+ if (last!=null && !currentInheritance.considerParent(last,
next, context)) break;
+
+ ConfigInheritance currentInheritanceExplicit =
ConfigInheritances.findInheritance(next.getKey(),
InheritanceContext.RUNTIME_MANAGEMENT, null);
+ if (currentInheritanceExplicit!=null) {
+ if (count>0 &&
!currentInheritanceExplicit.isReinheritable(next, context)) break;
+ currentInheritance = currentInheritanceExplicit;
+ }
+
+ if (next.isValueExplicitlySet()) result.add(0, next);
+
+ last = next;
+ c = getParentOfContainer(c);
+ count++;
+ }
+
+ return result;
+ }
--- End diff --
There feels like a scary looking number of methods on here now. I'm not
suggesting any specific method(s) that should be removed, but it's something
that we should be aware of - gut feel is that we have too many methods (even
ignoring the deprecated ones).
If we really need all these different ways of access it, then another would
would be to present this as "views" - e.g. a raw view, a resolved view, a
local-only view, etc.
But any such change are much longer term, rather than part of this PR!
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