/**
     * initialize all resources
     * set current page to 1
     * create paginator and subscribe to events
     */
    override fun initialize() {
        currentPage = 1
        paginator = PublishProcessor.create()

        val d = paginator.onBackpressureDrop()
                .doOnNext { view.showProgress() }
                .concatMap { contract.getItemsFromServer(it) }
                .observeOn(AndroidSchedulers.mainThread())
                .subscribe({
                    view.hideProgress()
                    view.showItems(it)
                    currentPage++
                }, {
                    view.hideProgress()
                    view.showError(it.localizedMessage)
                })

        disposables.add(d)

        onLoadMore(currentPage)
    }

    /**
     * called when list is scrolled to its bottom
     * @param page current page (not used)
     */
    override fun onLoadMore(page: Int) {
        paginator.onNext(currentPage)
    }