@Override
    public void setContinueOnFailure(boolean continueOnFailure) {
        this.continueOnFailure = continueOnFailure;
    }

    @Override
    public int size() {
        return nodeMapping.getNumberOfPublicNodes();
    }

    static class NodeMapping extends AbstractCollection<Node> {
        private final Map<Task, LocalTaskNode> taskMapping = new LinkedHashMap<>();