archaius-core/src/main/java/com/netflix/config/DynamicProperty.java
private static boolean updateAllProperties() {
        boolean changed = false;
        for (DynamicProperty prop : ALL_PROPS.values()) {
            if (prop.updateValue()) {
                prop.notifyCallbacks();
                changed = true;
            }
        }
        return changed;
    }
private static boolean updateAllProperties() {
        boolean changed = false;
        for (DynamicProperty prop : ALL_PROPS.values()) {
            if (prop.updateValue()) {
                prop.notifyCallbacks();
                changed = true;
            }
        }
        return changed;
    }
return true iff _some_ value actually changed