}

    @Override
    public void onPendingAdded(final Action<T> action) {
        this.pendingAddedAction = action;
    }

    @Override
    public void setSubscriptionVerifier(EventSubscriptionVerifier<T> subscriptionVerifier) {
        this.subscriptionVerifier = subscriptionVerifier;
    }

    protected boolean addPendingElement(Element<T> element) {