285 lines
11 KiB
C++
285 lines
11 KiB
C++
// 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-take_until.hpp
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\brief For each item from this observable until on_next occurs on the trigger observable or until the specified time, emit them from the new observable that is returned.
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take_until takes (TriggerObservable, optional Coordination) or (TimePoint, optional Coordination)
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\tparam TriggerSource the type of the trigger observable.
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\tparam TimePoint the type of the time interval.
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\tparam Coordination the type of the scheduler (optional).
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\param t an observable whose first emitted item will stop emitting items from the source observable.
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\param when a time point when the returned observable will stop emitting items.
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\param cn the scheduler to use for scheduling the items (optional).
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\return An observable that emits the items emitted by the source observable until trigger observable emitted or the time runs out.
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\sample
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\snippet take_until.cpp take_until sample
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\snippet output.txt take_until sample
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\sample
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\snippet take_until.cpp threaded take_until sample
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\snippet output.txt threaded take_until sample
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\sample
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\snippet take_until.cpp take_until time sample
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\snippet output.txt take_until time sample
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\sample
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\snippet take_until.cpp threaded take_until time sample
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\snippet output.txt threaded take_until time sample
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*/
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#if !defined(RXCPP_OPERATORS_RX_TAKE_UNTIL_HPP)
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#define RXCPP_OPERATORS_RX_TAKE_UNTIL_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 take_until_invalid_arguments {};
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template<class... AN>
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struct take_until_invalid : public rxo::operator_base<take_until_invalid_arguments<AN...>> {
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using type = observable<take_until_invalid_arguments<AN...>, take_until_invalid<AN...>>;
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};
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template<class... AN>
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using take_until_invalid_t = typename take_until_invalid<AN...>::type;
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template<class T, class Observable, class TriggerObservable, class Coordination>
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struct take_until : public operator_base<T>
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{
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typedef rxu::decay_t<Observable> source_type;
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typedef rxu::decay_t<TriggerObservable> trigger_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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struct values
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{
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values(source_type s, trigger_source_type t, coordination_type sf)
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: source(std::move(s))
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, trigger(std::move(t))
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, coordination(std::move(sf))
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{
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}
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source_type source;
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trigger_source_type trigger;
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coordination_type coordination;
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};
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values initial;
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take_until(source_type s, trigger_source_type t, coordination_type sf)
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: initial(std::move(s), std::move(t), std::move(sf))
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{
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}
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struct mode
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{
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enum type {
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taking, // no messages from trigger
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clear, // trigger completed
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triggered, // trigger sent on_next
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errored, // error either on trigger or on observable
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stopped // observable completed
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};
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};
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template<class Subscriber>
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void on_subscribe(Subscriber s) const {
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typedef Subscriber output_type;
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struct take_until_state_type
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: public std::enable_shared_from_this<take_until_state_type>
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, public values
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{
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take_until_state_type(const values& i, coordinator_type coor, const output_type& oarg)
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: values(i)
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, mode_value(mode::taking)
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, coordinator(std::move(coor))
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, out(oarg)
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{
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out.add(trigger_lifetime);
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out.add(source_lifetime);
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}
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typename mode::type mode_value;
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composite_subscription trigger_lifetime;
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composite_subscription source_lifetime;
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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(s.get_subscription());
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// take a copy of the values for each subscription
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auto state = std::make_shared<take_until_state_type>(initial, std::move(coordinator), std::move(s));
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auto trigger = on_exception(
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[&](){return state->coordinator.in(state->trigger);},
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state->out);
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if (trigger.empty()) {
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return;
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}
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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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auto sinkTrigger = make_subscriber<typename trigger_source_type::value_type>(
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// share parts of subscription
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state->out,
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// new lifetime
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state->trigger_lifetime,
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// on_next
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[state](const typename trigger_source_type::value_type&) {
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if (state->mode_value != mode::taking) {return;}
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state->mode_value = mode::triggered;
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state->out.on_completed();
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},
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// on_error
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[state](rxu::error_ptr e) {
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if (state->mode_value != mode::taking) {return;}
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state->mode_value = mode::errored;
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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->mode_value != mode::taking) {return;}
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state->mode_value = mode::clear;
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}
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);
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auto selectedSinkTrigger = on_exception(
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[&](){return state->coordinator.out(sinkTrigger);},
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state->out);
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if (selectedSinkTrigger.empty()) {
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return;
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}
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trigger->subscribe(std::move(selectedSinkTrigger.get()));
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auto sinkSource = make_subscriber<T>(
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// split subscription lifetime
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state->source_lifetime,
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// on_next
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[state](T t) {
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//
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// everything is crafted to minimize the overhead of this function.
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//
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if (state->mode_value < mode::triggered) {
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state->out.on_next(t);
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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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if (state->mode_value > mode::clear) {return;}
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state->mode_value = mode::errored;
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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->mode_value > mode::clear) {return;}
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state->mode_value = mode::stopped;
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state->out.on_completed();
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}
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);
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auto selectedSinkSource = on_exception(
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[&](){return state->coordinator.out(sinkSource);},
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state->out);
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if (selectedSinkSource.empty()) {
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return;
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}
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source->subscribe(std::move(selectedSinkSource.get()));
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}
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};
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}
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/*! @copydoc rx-take_until.hpp
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*/
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template<class... AN>
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auto take_until(AN&&... an)
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-> operator_factory<take_until_tag, AN...> {
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return operator_factory<take_until_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<take_until_tag>
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{
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template<class Observable, class TimePoint,
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class Enabled = rxu::enable_if_all_true_type_t<
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is_observable<Observable>,
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std::is_convertible<TimePoint, rxsc::scheduler::clock_type::time_point>>,
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class SourceValue = rxu::value_type_t<Observable>,
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class Timer = typename rxu::defer_type<rxs::detail::timer, identity_one_worker>::type,
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class TimerValue = rxu::value_type_t<Timer>,
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class TriggerObservable = observable<TimerValue, Timer>,
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class TakeUntil = rxo::detail::take_until<SourceValue, rxu::decay_t<Observable>, TriggerObservable, identity_one_worker>,
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class Value = rxu::value_type_t<TakeUntil>,
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class Result = observable<Value, TakeUntil>>
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static Result member(Observable&& o, TimePoint&& when) {
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auto cn = identity_current_thread();
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return Result(TakeUntil(std::forward<Observable>(o), rxs::timer(std::forward<TimePoint>(when), cn), cn));
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}
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template<class Observable, class TimePoint, 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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std::is_convertible<TimePoint, rxsc::scheduler::clock_type::time_point>>,
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class SourceValue = rxu::value_type_t<Observable>,
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class Timer = typename rxu::defer_type<rxs::detail::timer, rxu::decay_t<Coordination>>::type,
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class TimerValue = rxu::value_type_t<Timer>,
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class TriggerObservable = observable<TimerValue, Timer>,
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class TakeUntil = rxo::detail::take_until<SourceValue, rxu::decay_t<Observable>, TriggerObservable, rxu::decay_t<Coordination>>,
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class Value = rxu::value_type_t<TakeUntil>,
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class Result = observable<Value, TakeUntil>>
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static Result member(Observable&& o, TimePoint&& when, Coordination cn) {
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return Result(TakeUntil(std::forward<Observable>(o), rxs::timer(std::forward<TimePoint>(when), cn), cn));
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}
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template<class Observable, class TriggerObservable,
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class Enabled = rxu::enable_if_all_true_type_t<
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all_observables<Observable, TriggerObservable>>,
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class SourceValue = rxu::value_type_t<Observable>,
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class TakeUntil = rxo::detail::take_until<SourceValue, rxu::decay_t<Observable>, rxu::decay_t<TriggerObservable>, identity_one_worker>,
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class Value = rxu::value_type_t<TakeUntil>,
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class Result = observable<Value, TakeUntil>>
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static Result member(Observable&& o, TriggerObservable&& t) {
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return Result(TakeUntil(std::forward<Observable>(o), std::forward<TriggerObservable>(t), identity_current_thread()));
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}
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template<class Observable, class TriggerObservable, class Coordination,
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class Enabled = rxu::enable_if_all_true_type_t<
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all_observables<Observable, TriggerObservable>,
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is_coordination<Coordination>>,
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class SourceValue = rxu::value_type_t<Observable>,
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class TakeUntil = rxo::detail::take_until<SourceValue, rxu::decay_t<Observable>, rxu::decay_t<TriggerObservable>, rxu::decay_t<Coordination>>,
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class Value = rxu::value_type_t<TakeUntil>,
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class Result = observable<Value, TakeUntil>>
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static Result member(Observable&& o, TriggerObservable&& t, Coordination&& cn) {
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return Result(TakeUntil(std::forward<Observable>(o), std::forward<TriggerObservable>(t), std::forward<Coordination>(cn)));
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}
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template<class... AN>
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static operators::detail::take_until_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, "take_until takes (TriggerObservable, optional Coordination) or (TimePoint, optional Coordination)");
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}
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};
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}
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#endif
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