238 lines
8.6 KiB
C++
238 lines
8.6 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-delay.hpp
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\brief Return an observable that emits each item emitted by the source observable after the specified delay.
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\tparam Duration the type of time interval
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\tparam Coordination the type of the scheduler
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\param period the period of time each item is delayed
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\param coordination the scheduler for the delays
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\return Observable that emits each item emitted by the source observable after the specified delay.
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\sample
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\snippet delay.cpp delay period+coordination sample
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\snippet output.txt delay period+coordination sample
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*/
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#if !defined(RXCPP_OPERATORS_RX_DELAY_HPP)
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#define RXCPP_OPERATORS_RX_DELAY_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 delay_invalid_arguments {};
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template<class... AN>
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struct delay_invalid : public rxo::operator_base<delay_invalid_arguments<AN...>> {
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using type = observable<delay_invalid_arguments<AN...>, delay_invalid<AN...>>;
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};
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template<class... AN>
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using delay_invalid_t = typename delay_invalid<AN...>::type;
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template<class T, class Duration, class Coordination>
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struct delay
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{
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typedef rxu::decay_t<T> source_value_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 rxu::decay_t<Duration> duration_type;
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struct delay_values
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{
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delay_values(duration_type p, coordination_type c)
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: period(p)
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, coordination(c)
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{
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}
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duration_type period;
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coordination_type coordination;
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};
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delay_values initial;
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delay(duration_type period, coordination_type coordination)
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: initial(period, coordination)
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{
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}
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template<class Subscriber>
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struct delay_observer
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{
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typedef delay_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 delay_subscriber_values : public delay_values
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{
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delay_subscriber_values(composite_subscription cs, dest_type d, delay_values v, coordinator_type c)
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: delay_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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, expected(worker.now())
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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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rxsc::scheduler::clock_type::time_point expected;
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};
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std::shared_ptr<delay_subscriber_values> state;
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delay_observer(composite_subscription cs, dest_type d, delay_values v, coordinator_type c)
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: state(std::make_shared<delay_subscriber_values>(delay_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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auto disposer = [=](const rxsc::schedulable&){
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localState->cs.unsubscribe();
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localState->dest.unsubscribe();
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localState->worker.unsubscribe();
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};
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auto selectedDisposer = on_exception(
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[&](){return localState->coordinator.act(disposer);},
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localState->dest);
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if (selectedDisposer.empty()) {
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return;
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}
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localState->dest.add([=](){
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localState->worker.schedule(selectedDisposer.get());
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});
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localState->cs.add([=](){
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localState->worker.schedule(localState->worker.now() + localState->period, selectedDisposer.get());
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});
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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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localState->dest.on_next(v);
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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(localState->worker.now() + localState->period, 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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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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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(localState->worker.now() + localState->period, selectedWork.get());
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}
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static subscriber<T, observer_type> make(dest_type d, delay_values v) {
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auto cs = composite_subscription();
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auto coordinator = v.coordination.create_coordinator();
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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(delay_observer<Subscriber>::make(std::move(dest), initial)) {
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return delay_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-delay.hpp
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*/
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template<class... AN>
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auto delay(AN&&... an)
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-> operator_factory<delay_tag, AN...> {
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return operator_factory<delay_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<delay_tag>
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{
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template<class Observable, class Duration,
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class Enabled = rxu::enable_if_all_true_type_t<
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is_observable<Observable>,
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rxu::is_duration<Duration>>,
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class SourceValue = rxu::value_type_t<Observable>,
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class delay = rxo::detail::delay<SourceValue, rxu::decay_t<Duration>, identity_one_worker>>
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static auto member(Observable&& o, Duration&& d)
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-> decltype(o.template lift<SourceValue>(delay(std::forward<Duration>(d), identity_current_thread()))) {
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return o.template lift<SourceValue>(delay(std::forward<Duration>(d), identity_current_thread()));
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}
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template<class Observable, class Coordination, class Duration,
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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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rxu::is_duration<Duration>>,
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class SourceValue = rxu::value_type_t<Observable>,
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class delay = rxo::detail::delay<SourceValue, rxu::decay_t<Duration>, rxu::decay_t<Coordination>>>
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static auto member(Observable&& o, Coordination&& cn, Duration&& d)
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-> decltype(o.template lift<SourceValue>(delay(std::forward<Duration>(d), std::forward<Coordination>(cn)))) {
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return o.template lift<SourceValue>(delay(std::forward<Duration>(d), std::forward<Coordination>(cn)));
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}
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template<class Observable, class Coordination, class Duration,
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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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rxu::is_duration<Duration>>,
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class SourceValue = rxu::value_type_t<Observable>,
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class delay = rxo::detail::delay<SourceValue, rxu::decay_t<Duration>, rxu::decay_t<Coordination>>>
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static auto member(Observable&& o, Duration&& d, Coordination&& cn)
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-> decltype(o.template lift<SourceValue>(delay(std::forward<Duration>(d), std::forward<Coordination>(cn)))) {
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return o.template lift<SourceValue>(delay(std::forward<Duration>(d), std::forward<Coordination>(cn)));
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}
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template<class... AN>
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static operators::detail::delay_invalid_t<AN...> member(const AN&...) {
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std::terminate();
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return {};
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static_assert(sizeof...(AN) == 10000, "delay takes (optional Coordination, required Duration) or (required Duration, optional Coordination)");
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}
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};
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}
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#endif
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