Avoid map resizing in PrivateViewConfig #730
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Properly size the LinkedHashMaps in the createState method to avoid rehashing / resizing. Additionally, if instrumentation is not enabled, just use the singleton empty map. To facilitate this change, add an Iterables utility class with a "size" helper to determine the size of the passed in Iterable; this is necessary because the Config::keys method returns Iterable, but in practice is typically a Collection. Finally, add a marker annotation, Internal, to indicate classes such as Maps and Iterables that are not meant to be used by users of Archaius and may not have stable APIs.
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Properly size the LinkedHashMaps in the createState method to avoid rehashing / resizing. Additionally, if instrumentation is not enabled, just use the singleton empty map.
To facilitate this change, add an Iterables utility class with a "size" helper to determine the size of the passed in Iterable; this is necessary because the Config::keys method returns Iterable, but in practice is typically a Collection.
Finally, add a marker annotation, Internal, to indicate classes such as Maps and Iterables that are not meant to be used by users of Archaius and may not have stable APIs.