public V get(final K key) {
        final ManagedReference<V> ref = internalMap.get(key);
        if (ref != null) return ref.get();
        return null;
    }
Returns the value stored for the given key at the point of call.

@param key a non null key
@return the value stored in the map for the given key
gremlin-groovy/src/main/java/org/apache/tinkerpop/gremlin/groovy/jsr223/ManagedConcurrentValueMap.java