325 lines
13 KiB
C++
325 lines
13 KiB
C++
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// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
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#pragma once
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/*! \file rx-window_toggle.hpp
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\brief Return an observable that emits observables every period time interval and collects items from this observable for period of time into each produced observable, on the specified scheduler.
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\tparam Openings observable<OT>
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\tparam ClosingSelector a function of type observable<CT>(OT)
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\tparam Coordination the type of the scheduler (optional).
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\param opens each value from this observable opens a new window.
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\param closes this function is called for each opened window and returns an observable. the first value from the returned observable will close the window.
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\param coordination the scheduler for the windows (optional).
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\return Observable that emits an observable for each opened window.
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\sample
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\snippet window.cpp window toggle+coordination sample
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\snippet output.txt window toggle+coordination sample
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\sample
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\snippet window.cpp window toggle sample
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\snippet output.txt window toggle sample
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*/
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#if !defined(RXCPP_OPERATORS_RX_WINDOW_TOGGLE_HPP)
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#define RXCPP_OPERATORS_RX_WINDOW_TOGGLE_HPP
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#include "../rx-includes.hpp"
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namespace rxcpp {
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namespace operators {
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namespace detail {
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template<class... AN>
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struct window_toggle_invalid_arguments {};
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template<class... AN>
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struct window_toggle_invalid : public rxo::operator_base<window_toggle_invalid_arguments<AN...>> {
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using type = observable<window_toggle_invalid_arguments<AN...>, window_toggle_invalid<AN...>>;
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};
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template<class... AN>
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using window_toggle_invalid_t = typename window_toggle_invalid<AN...>::type;
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template<class T, class Openings, class ClosingSelector, class Coordination>
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struct window_toggle
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{
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typedef window_toggle<T, Openings, ClosingSelector, Coordination> this_type;
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using source_value_type = rxu::decay_t<T>;
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using coordination_type = rxu::decay_t<Coordination>;
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using coordinator_type = typename coordination_type::coordinator_type;
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using openings_type = rxu::decay_t<Openings>;
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using openings_value_type = typename openings_type::value_type;
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using closing_selector_type = rxu::decay_t<ClosingSelector>;
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using closings_type = rxu::result_of_t<closing_selector_type(openings_value_type)>;
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using closings_value_type = typename closings_type::value_type;
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struct window_toggle_values
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{
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window_toggle_values(openings_type opens, closing_selector_type closes, coordination_type c)
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: openings(opens)
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, closingSelector(closes)
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, coordination(c)
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{
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}
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openings_type openings;
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mutable closing_selector_type closingSelector;
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coordination_type coordination;
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};
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window_toggle_values initial;
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window_toggle(openings_type opens, closing_selector_type closes, coordination_type coordination)
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: initial(opens, closes, coordination)
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{
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}
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template<class Subscriber>
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struct window_toggle_observer
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{
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typedef window_toggle_observer<Subscriber> this_type;
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typedef rxu::decay_t<T> value_type;
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typedef rxu::decay_t<Subscriber> dest_type;
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typedef observer<T, this_type> observer_type;
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struct window_toggle_subscriber_values : public window_toggle_values
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{
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window_toggle_subscriber_values(composite_subscription cs, dest_type d, window_toggle_values v, coordinator_type c)
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: window_toggle_values(v)
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, cs(std::move(cs))
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, dest(std::move(d))
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, coordinator(std::move(c))
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, worker(coordinator.get_worker())
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{
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}
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composite_subscription cs;
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dest_type dest;
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coordinator_type coordinator;
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rxsc::worker worker;
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mutable std::list<rxcpp::subjects::subject<T>> subj;
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};
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std::shared_ptr<window_toggle_subscriber_values> state;
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window_toggle_observer(composite_subscription cs, dest_type d, window_toggle_values v, coordinator_type c)
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: state(std::make_shared<window_toggle_subscriber_values>(window_toggle_subscriber_values(std::move(cs), std::move(d), v, std::move(c))))
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{
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auto localState = state;
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composite_subscription innercs;
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// when the out observer is unsubscribed all the
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// inner subscriptions are unsubscribed as well
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auto innerscope = localState->dest.add(innercs);
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innercs.add([=](){
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localState->dest.remove(innerscope);
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});
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localState->dest.add(localState->cs);
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auto source = on_exception(
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[&](){return localState->coordinator.in(localState->openings);},
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localState->dest);
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if (source.empty()) {
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return;
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}
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// this subscribe does not share the observer subscription
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// so that when it is unsubscribed the observer can be called
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// until the inner subscriptions have finished
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auto sink = make_subscriber<openings_value_type>(
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localState->dest,
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innercs,
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// on_next
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[localState](const openings_value_type& ov) {
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auto closer = localState->closingSelector(ov);
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auto it = localState->subj.insert(localState->subj.end(), rxcpp::subjects::subject<T>());
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localState->dest.on_next(it->get_observable().as_dynamic());
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composite_subscription innercs;
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// when the out observer is unsubscribed all the
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// inner subscriptions are unsubscribed as well
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auto innerscope = localState->dest.add(innercs);
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innercs.add([=](){
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localState->dest.remove(innerscope);
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});
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auto source = localState->coordinator.in(closer);
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auto sit = std::make_shared<decltype(it)>(it);
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auto close = [localState, sit]() {
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auto it = *sit;
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*sit = localState->subj.end();
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if (it != localState->subj.end()) {
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it->get_subscriber().on_completed();
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localState->subj.erase(it);
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}
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};
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// this subscribe does not share the observer subscription
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// so that when it is unsubscribed the observer can be called
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// until the inner subscriptions have finished
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auto sink = make_subscriber<closings_value_type>(
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localState->dest,
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innercs,
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// on_next
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[close, innercs](closings_value_type) {
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close();
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innercs.unsubscribe();
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},
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// on_error
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[localState](rxu::error_ptr e) {
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localState->dest.on_error(e);
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},
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// on_completed
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close
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);
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auto selectedSink = localState->coordinator.out(sink);
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source.subscribe(std::move(selectedSink));
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},
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// on_error
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[localState](rxu::error_ptr e) {
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localState->dest.on_error(e);
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},
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// on_completed
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[]() {
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}
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);
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auto selectedSink = on_exception(
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[&](){return localState->coordinator.out(sink);},
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localState->dest);
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if (selectedSink.empty()) {
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return;
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}
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source->subscribe(std::move(selectedSink.get()));
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}
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void on_next(T v) const {
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auto localState = state;
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auto work = [v, localState](const rxsc::schedulable&){
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for (auto s : localState->subj) {
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s.get_subscriber().on_next(v);
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}
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};
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auto selectedWork = on_exception(
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[&](){return localState->coordinator.act(work);},
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localState->dest);
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if (selectedWork.empty()) {
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return;
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}
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localState->worker.schedule(selectedWork.get());
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}
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void on_error(rxu::error_ptr e) const {
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auto localState = state;
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auto work = [e, localState](const rxsc::schedulable&){
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for (auto s : localState->subj) {
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s.get_subscriber().on_error(e);
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}
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localState->dest.on_error(e);
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};
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auto selectedWork = on_exception(
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[&](){return localState->coordinator.act(work);},
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localState->dest);
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if (selectedWork.empty()) {
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return;
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}
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localState->worker.schedule(selectedWork.get());
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}
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void on_completed() const {
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auto localState = state;
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auto work = [localState](const rxsc::schedulable&){
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for (auto s : localState->subj) {
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s.get_subscriber().on_completed();
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}
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localState->dest.on_completed();
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};
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auto selectedWork = on_exception(
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[&](){return localState->coordinator.act(work);},
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localState->dest);
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if (selectedWork.empty()) {
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return;
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}
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localState->worker.schedule(selectedWork.get());
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}
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static subscriber<T, observer_type> make(dest_type d, window_toggle_values v) {
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auto cs = composite_subscription();
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auto coordinator = v.coordination.create_coordinator(d.get_subscription());
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return make_subscriber<T>(cs, observer_type(this_type(cs, std::move(d), std::move(v), std::move(coordinator))));
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}
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};
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template<class Subscriber>
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auto operator()(Subscriber dest) const
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-> decltype(window_toggle_observer<Subscriber>::make(std::move(dest), initial)) {
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return window_toggle_observer<Subscriber>::make(std::move(dest), initial);
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}
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};
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}
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/*! @copydoc rx-window_toggle.hpp
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*/
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template<class... AN>
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auto window_toggle(AN&&... an)
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-> operator_factory<window_toggle_tag, AN...> {
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return operator_factory<window_toggle_tag, AN...>(std::make_tuple(std::forward<AN>(an)...));
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}
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}
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template<>
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struct member_overload<window_toggle_tag>
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{
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template<class Observable, class Openings, class ClosingSelector,
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class ClosingSelectorType = rxu::decay_t<ClosingSelector>,
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class OpeningsType = rxu::decay_t<Openings>,
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class OpeningsValueType = typename OpeningsType::value_type,
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class Enabled = rxu::enable_if_all_true_type_t<
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all_observables<Observable, Openings, rxu::result_of_t<ClosingSelectorType(OpeningsValueType)>>>,
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class SourceValue = rxu::value_type_t<Observable>,
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class WindowToggle = rxo::detail::window_toggle<SourceValue, rxu::decay_t<Openings>, rxu::decay_t<ClosingSelector>, identity_one_worker>,
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class Value = observable<SourceValue>>
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static auto member(Observable&& o, Openings&& openings, ClosingSelector&& closingSelector)
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-> decltype(o.template lift<Value>(WindowToggle(std::forward<Openings>(openings), std::forward<ClosingSelector>(closingSelector), identity_immediate()))) {
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return o.template lift<Value>(WindowToggle(std::forward<Openings>(openings), std::forward<ClosingSelector>(closingSelector), identity_immediate()));
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}
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template<class Observable, class Openings, class ClosingSelector, class Coordination,
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class ClosingSelectorType = rxu::decay_t<ClosingSelector>,
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class OpeningsType = rxu::decay_t<Openings>,
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class OpeningsValueType = typename OpeningsType::value_type,
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class Enabled = rxu::enable_if_all_true_type_t<
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all_observables<Observable, Openings, rxu::result_of_t<ClosingSelectorType(OpeningsValueType)>>,
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is_coordination<Coordination>>,
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class SourceValue = rxu::value_type_t<Observable>,
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class WindowToggle = rxo::detail::window_toggle<SourceValue, rxu::decay_t<Openings>, rxu::decay_t<ClosingSelector>, rxu::decay_t<Coordination>>,
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class Value = observable<SourceValue>>
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static auto member(Observable&& o, Openings&& openings, ClosingSelector&& closingSelector, Coordination&& cn)
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-> decltype(o.template lift<Value>(WindowToggle(std::forward<Openings>(openings), std::forward<ClosingSelector>(closingSelector), std::forward<Coordination>(cn)))) {
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return o.template lift<Value>(WindowToggle(std::forward<Openings>(openings), std::forward<ClosingSelector>(closingSelector), std::forward<Coordination>(cn)));
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}
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template<class... AN>
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static operators::detail::window_toggle_invalid_t<AN...> member(AN...) {
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std::terminate();
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return {};
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static_assert(sizeof...(AN) == 10000, "window_toggle takes (Openings, ClosingSelector, optional Coordination)");
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}
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};
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}
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#endif
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