310 lines
12 KiB
C++
310 lines
12 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-concat.hpp
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\brief For each item from this observable subscribe to one at a time, in the order received.
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For each item from all of the given observables deliver from the new observable that is returned.
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There are 2 variants of the operator:
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- The source observable emits nested observables, nested observables are concatenated.
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- The source observable and the arguments v0...vn are used to provide the observables to concatenate.
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\tparam Coordination the type of the scheduler (optional).
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\tparam Value0 ... (optional).
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\tparam ValueN types of source observables (optional).
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\param cn the scheduler to synchronize sources from different contexts (optional).
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\param v0 ... (optional).
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\param vn source observables (optional).
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\return Observable that emits the items emitted by each of the Observables emitted by the source observable, one after the other, without interleaving them.
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\sample
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\snippet concat.cpp implicit concat sample
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\snippet output.txt implicit concat sample
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\sample
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\snippet concat.cpp threaded implicit concat sample
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\snippet output.txt threaded implicit concat sample
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\sample
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\snippet concat.cpp concat sample
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\snippet output.txt concat sample
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\sample
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\snippet concat.cpp threaded concat sample
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\snippet output.txt threaded concat sample
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*/
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#if !defined(RXCPP_OPERATORS_RX_CONCAT_HPP)
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#define RXCPP_OPERATORS_RX_CONCAT_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 concat_invalid_arguments {};
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template<class... AN>
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struct concat_invalid : public rxo::operator_base<concat_invalid_arguments<AN...>> {
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using type = observable<concat_invalid_arguments<AN...>, concat_invalid<AN...>>;
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};
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template<class... AN>
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using concat_invalid_t = typename concat_invalid<AN...>::type;
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template<class T, class Observable, class Coordination>
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struct concat
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: public operator_base<rxu::value_type_t<rxu::decay_t<T>>>
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{
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typedef concat<T, Observable, Coordination> this_type;
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typedef rxu::decay_t<T> source_value_type;
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typedef rxu::decay_t<Observable> source_type;
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typedef rxu::decay_t<Coordination> coordination_type;
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typedef typename coordination_type::coordinator_type coordinator_type;
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typedef typename source_type::source_operator_type source_operator_type;
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typedef source_value_type collection_type;
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typedef typename collection_type::value_type value_type;
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struct values
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{
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values(source_operator_type o, coordination_type sf)
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: source_operator(std::move(o))
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, coordination(std::move(sf))
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{
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}
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source_operator_type source_operator;
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coordination_type coordination;
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};
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values initial;
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concat(const source_type& o, coordination_type sf)
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: initial(o.source_operator, std::move(sf))
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{
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}
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template<class Subscriber>
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void on_subscribe(Subscriber scbr) const {
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static_assert(is_subscriber<Subscriber>::value, "subscribe must be passed a subscriber");
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typedef Subscriber output_type;
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struct concat_state_type
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: public std::enable_shared_from_this<concat_state_type>
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, public values
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{
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concat_state_type(values i, coordinator_type coor, output_type oarg)
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: values(i)
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, source(i.source_operator)
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, sourceLifetime(composite_subscription::empty())
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, collectionLifetime(composite_subscription::empty())
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, coordinator(std::move(coor))
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, out(std::move(oarg))
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{
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}
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void subscribe_to(collection_type st)
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{
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auto state = this->shared_from_this();
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collectionLifetime = composite_subscription();
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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 innercstoken = state->out.add(collectionLifetime);
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collectionLifetime.add(make_subscription([state, innercstoken](){
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state->out.remove(innercstoken);
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}));
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auto selectedSource = on_exception(
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[&](){return state->coordinator.in(std::move(st));},
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state->out);
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if (selectedSource.empty()) {
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return;
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}
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// this subscribe does not share the out subscription
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// so that when it is unsubscribed the out will continue
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auto sinkInner = make_subscriber<value_type>(
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state->out,
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collectionLifetime,
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// on_next
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[state, st](value_type ct) {
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state->out.on_next(ct);
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},
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// on_error
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[state](rxu::error_ptr e) {
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state->out.on_error(e);
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},
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//on_completed
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[state](){
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if (!state->selectedCollections.empty()) {
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auto value = state->selectedCollections.front();
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state->selectedCollections.pop_front();
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state->collectionLifetime.unsubscribe();
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state->subscribe_to(value);
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} else if (!state->sourceLifetime.is_subscribed()) {
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state->out.on_completed();
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}
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}
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);
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auto selectedSinkInner = on_exception(
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[&](){return state->coordinator.out(sinkInner);},
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state->out);
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if (selectedSinkInner.empty()) {
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return;
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}
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selectedSource->subscribe(std::move(selectedSinkInner.get()));
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}
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observable<source_value_type, source_operator_type> source;
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composite_subscription sourceLifetime;
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composite_subscription collectionLifetime;
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std::deque<collection_type> selectedCollections;
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coordinator_type coordinator;
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output_type out;
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};
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auto coordinator = initial.coordination.create_coordinator(scbr.get_subscription());
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// take a copy of the values for each subscription
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auto state = std::make_shared<concat_state_type>(initial, std::move(coordinator), std::move(scbr));
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state->sourceLifetime = composite_subscription();
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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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state->out.add(state->sourceLifetime);
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auto source = on_exception(
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[&](){return state->coordinator.in(state->source);},
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state->out);
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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<collection_type>(
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state->out,
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state->sourceLifetime,
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// on_next
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[state](collection_type st) {
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if (state->collectionLifetime.is_subscribed()) {
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state->selectedCollections.push_back(st);
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} else if (state->selectedCollections.empty()) {
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state->subscribe_to(st);
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}
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},
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// on_error
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[state](rxu::error_ptr e) {
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state->out.on_error(e);
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},
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// on_completed
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[state]() {
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if (!state->collectionLifetime.is_subscribed() && state->selectedCollections.empty()) {
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state->out.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 state->coordinator.out(sink);},
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state->out);
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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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};
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}
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/*! @copydoc rx-concat.hpp
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*/
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template<class... AN>
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auto concat(AN&&... an)
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-> operator_factory<concat_tag, AN...> {
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return operator_factory<concat_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<concat_tag>
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{
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template<class Observable,
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class Enabled = rxu::enable_if_all_true_type_t<
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is_observable<Observable>>,
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class SourceValue = rxu::value_type_t<Observable>,
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class Concat = rxo::detail::concat<SourceValue, rxu::decay_t<Observable>, identity_one_worker>,
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class Value = rxu::value_type_t<SourceValue>,
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class Result = observable<Value, Concat>
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>
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static Result member(Observable&& o) {
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return Result(Concat(std::forward<Observable>(o), identity_current_thread()));
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}
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template<class Observable, class Coordination,
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class Enabled = rxu::enable_if_all_true_type_t<
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is_observable<Observable>,
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is_coordination<Coordination>>,
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class SourceValue = rxu::value_type_t<Observable>,
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class Concat = rxo::detail::concat<SourceValue, rxu::decay_t<Observable>, rxu::decay_t<Coordination>>,
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class Value = rxu::value_type_t<SourceValue>,
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class Result = observable<Value, Concat>
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>
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static Result member(Observable&& o, Coordination&& cn) {
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return Result(Concat(std::forward<Observable>(o), std::forward<Coordination>(cn)));
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}
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template<class Observable, class Value0, class... ValueN,
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class Enabled = rxu::enable_if_all_true_type_t<
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all_observables<Observable, Value0, ValueN...>>,
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class EmittedValue = rxu::value_type_t<Observable>,
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class SourceValue = observable<EmittedValue>,
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class ObservableObservable = observable<SourceValue>,
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class Concat = typename rxu::defer_type<rxo::detail::concat, SourceValue, ObservableObservable, identity_one_worker>::type,
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class Value = rxu::value_type_t<Concat>,
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class Result = observable<Value, Concat>
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>
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static Result member(Observable&& o, Value0&& v0, ValueN&&... vn) {
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return Result(Concat(rxs::from(o.as_dynamic(), v0.as_dynamic(), vn.as_dynamic()...), identity_current_thread()));
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}
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template<class Observable, class Coordination, class Value0, class... ValueN,
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class Enabled = rxu::enable_if_all_true_type_t<
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all_observables<Observable, Value0, ValueN...>,
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is_coordination<Coordination>>,
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class EmittedValue = rxu::value_type_t<Observable>,
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class SourceValue = observable<EmittedValue>,
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class ObservableObservable = observable<SourceValue>,
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class Concat = typename rxu::defer_type<rxo::detail::concat, SourceValue, ObservableObservable, rxu::decay_t<Coordination>>::type,
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class Value = rxu::value_type_t<Concat>,
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class Result = observable<Value, Concat>
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>
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static Result member(Observable&& o, Coordination&& cn, Value0&& v0, ValueN&&... vn) {
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return Result(Concat(rxs::from(o.as_dynamic(), v0.as_dynamic(), vn.as_dynamic()...), std::forward<Coordination>(cn)));
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}
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template<class... AN>
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static operators::detail::concat_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, "concat takes (optional Coordination, optional Value0, optional ValueN...)");
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}
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};
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}
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#endif
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