ConcurrentHashMap/ConcurrentMap/Map.compute

[Doug Lea]

On 12/14/12 10:12, David M. Lloyd wrote:

> What's wrong with:
>
>    default V computeIfAbsent(K key, Function<? super K, ? extends V>
> mappingFunction) {
>        V v, newValue;
>        if ((v = get(key)) != null) return v;
>        newValue = mappingFunction.apply(key);
>        return putIfAbsent(key, newValue);
>    }

putIfAbsent uses the "put" convention of returning the previous value
or null if absent. (Arguably this was a mistake, but not one we can
do anything about.)

-Doug