257 lines
9.7 KiB
C++
257 lines
9.7 KiB
C++
|
// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
|
||
|
|
|
||
|
|
#pragma once
|
||
|
|
|
||
|
|
/*! \file rx-sample_time.hpp
|
||
|
|
|
||
|
|
\brief Return an Observable that emits the most recent items emitted by the source Observable within periodic time intervals.
|
||
|
|
|
||
|
|
\tparam Duration the type of time interval.
|
||
|
|
\tparam Coordination the type of the scheduler (optional).
|
||
|
|
|
||
|
|
\param period the period of time to sample the source observable.
|
||
|
|
\param coordination the scheduler for the items (optional).
|
||
|
|
|
||
|
|
\return Observable that emits the most recently emitted item since the previous sampling.
|
||
|
|
|
||
|
|
\sample
|
||
|
|
\snippet sample.cpp sample period sample
|
||
|
|
\snippet output.txt sample period sample
|
||
|
|
*/
|
||
|
|
|
||
|
|
#if !defined(RXCPP_OPERATORS_RX_SAMPLE_WITH_TIME_HPP)
|
||
|
|
#define RXCPP_OPERATORS_RX_SAMPLE_WITH_TIME_HPP
|
||
|
|
|
||
|
|
#include "../rx-includes.hpp"
|
||
|
|
|
||
|
|
namespace rxcpp {
|
||
|
|
|
||
|
|
namespace operators {
|
||
|
|
|
||
|
|
namespace detail {
|
||
|
|
|
||
|
|
template<class... AN>
|
||
|
|
struct sample_with_time_invalid_arguments {};
|
||
|
|
|
||
|
|
template<class... AN>
|
||
|
|
struct sample_with_time_invalid : public rxo::operator_base<sample_with_time_invalid_arguments<AN...>> {
|
||
|
|
using type = observable<sample_with_time_invalid_arguments<AN...>, sample_with_time_invalid<AN...>>;
|
||
|
|
};
|
||
|
|
template<class... AN>
|
||
|
|
using sample_with_time_invalid_t = typename sample_with_time_invalid<AN...>::type;
|
||
|
|
|
||
|
|
template<class T, class Duration, class Coordination>
|
||
|
|
struct sample_with_time
|
||
|
|
{
|
||
|
|
typedef rxu::decay_t<T> source_value_type;
|
||
|
|
typedef rxu::decay_t<Coordination> coordination_type;
|
||
|
|
typedef typename coordination_type::coordinator_type coordinator_type;
|
||
|
|
typedef rxu::decay_t<Duration> duration_type;
|
||
|
|
|
||
|
|
struct sample_with_time_value
|
||
|
|
{
|
||
|
|
sample_with_time_value(duration_type p, coordination_type c)
|
||
|
|
: period(p)
|
||
|
|
, coordination(c)
|
||
|
|
{
|
||
|
|
}
|
||
|
|
duration_type period;
|
||
|
|
coordination_type coordination;
|
||
|
|
};
|
||
|
|
sample_with_time_value initial;
|
||
|
|
|
||
|
|
sample_with_time(duration_type period, coordination_type coordination)
|
||
|
|
: initial(period, coordination)
|
||
|
|
{
|
||
|
|
}
|
||
|
|
|
||
|
|
template<class Subscriber>
|
||
|
|
struct sample_with_time_observer
|
||
|
|
{
|
||
|
|
typedef sample_with_time_observer<Subscriber> this_type;
|
||
|
|
typedef T value_type;
|
||
|
|
typedef rxu::decay_t<Subscriber> dest_type;
|
||
|
|
typedef observer<value_type, this_type> observer_type;
|
||
|
|
|
||
|
|
struct sample_with_time_subscriber_value : public sample_with_time_value
|
||
|
|
{
|
||
|
|
sample_with_time_subscriber_value(composite_subscription cs, dest_type d, sample_with_time_value v, coordinator_type c)
|
||
|
|
: sample_with_time_value(v)
|
||
|
|
, cs(std::move(cs))
|
||
|
|
, dest(std::move(d))
|
||
|
|
, coordinator(std::move(c))
|
||
|
|
, worker(coordinator.get_worker())
|
||
|
|
{
|
||
|
|
}
|
||
|
|
composite_subscription cs;
|
||
|
|
dest_type dest;
|
||
|
|
coordinator_type coordinator;
|
||
|
|
rxsc::worker worker;
|
||
|
|
mutable rxu::maybe<value_type> value;
|
||
|
|
};
|
||
|
|
std::shared_ptr<sample_with_time_subscriber_value> state;
|
||
|
|
|
||
|
|
sample_with_time_observer(composite_subscription cs, dest_type d, sample_with_time_value v, coordinator_type c)
|
||
|
|
: state(std::make_shared<sample_with_time_subscriber_value>(sample_with_time_subscriber_value(std::move(cs), std::move(d), v, std::move(c))))
|
||
|
|
{
|
||
|
|
auto localState = state;
|
||
|
|
|
||
|
|
auto disposer = [=](const rxsc::schedulable&){
|
||
|
|
localState->cs.unsubscribe();
|
||
|
|
localState->dest.unsubscribe();
|
||
|
|
localState->worker.unsubscribe();
|
||
|
|
};
|
||
|
|
auto selectedDisposer = on_exception(
|
||
|
|
[&](){ return localState->coordinator.act(disposer); },
|
||
|
|
localState->dest);
|
||
|
|
if (selectedDisposer.empty()) {
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
localState->dest.add([=](){
|
||
|
|
localState->worker.schedule(selectedDisposer.get());
|
||
|
|
});
|
||
|
|
localState->cs.add([=](){
|
||
|
|
localState->worker.schedule(selectedDisposer.get());
|
||
|
|
});
|
||
|
|
|
||
|
|
auto produce_sample = [localState](const rxsc::schedulable&) {
|
||
|
|
if(!localState->value.empty()) {
|
||
|
|
localState->dest.on_next(*localState->value);
|
||
|
|
localState->value.reset();
|
||
|
|
}
|
||
|
|
};
|
||
|
|
auto selectedProduce = on_exception(
|
||
|
|
[&](){ return localState->coordinator.act(produce_sample); },
|
||
|
|
localState->dest);
|
||
|
|
if (selectedProduce.empty()) {
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
state->worker.schedule_periodically(
|
||
|
|
localState->worker.now(),
|
||
|
|
localState->period,
|
||
|
|
[localState, selectedProduce](const rxsc::schedulable&) {
|
||
|
|
localState->worker.schedule(selectedProduce.get());
|
||
|
|
});
|
||
|
|
}
|
||
|
|
|
||
|
|
void on_next(T v) const {
|
||
|
|
auto localState = state;
|
||
|
|
auto work = [v, localState](const rxsc::schedulable&) {
|
||
|
|
localState->value.reset(v);
|
||
|
|
};
|
||
|
|
auto selectedWork = on_exception(
|
||
|
|
[&](){ return localState->coordinator.act(work); },
|
||
|
|
localState->dest);
|
||
|
|
if (selectedWork.empty()) {
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
localState->worker.schedule(selectedWork.get());
|
||
|
|
}
|
||
|
|
|
||
|
|
void on_error(rxu::error_ptr e) const {
|
||
|
|
auto localState = state;
|
||
|
|
auto work = [e, localState](const rxsc::schedulable&) {
|
||
|
|
localState->dest.on_error(e);
|
||
|
|
};
|
||
|
|
auto selectedWork = on_exception(
|
||
|
|
[&](){ return localState->coordinator.act(work); },
|
||
|
|
localState->dest);
|
||
|
|
if (selectedWork.empty()) {
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
localState->worker.schedule(selectedWork.get());
|
||
|
|
}
|
||
|
|
|
||
|
|
void on_completed() const {
|
||
|
|
auto localState = state;
|
||
|
|
auto work = [localState](const rxsc::schedulable&) {
|
||
|
|
localState->dest.on_completed();
|
||
|
|
};
|
||
|
|
auto selectedWork = on_exception(
|
||
|
|
[&](){ return localState->coordinator.act(work); },
|
||
|
|
localState->dest);
|
||
|
|
if (selectedWork.empty()) {
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
localState->worker.schedule(selectedWork.get());
|
||
|
|
}
|
||
|
|
|
||
|
|
static subscriber<T, observer<T, this_type>> make(dest_type d, sample_with_time_value v) {
|
||
|
|
auto cs = composite_subscription();
|
||
|
|
auto coordinator = v.coordination.create_coordinator();
|
||
|
|
|
||
|
|
return make_subscriber<T>(cs, this_type(cs, std::move(d), std::move(v), std::move(coordinator)));
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
template<class Subscriber>
|
||
|
|
auto operator()(Subscriber dest) const
|
||
|
|
-> decltype(sample_with_time_observer<Subscriber>::make(std::move(dest), initial)) {
|
||
|
|
return sample_with_time_observer<Subscriber>::make(std::move(dest), initial);
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
/*! @copydoc rx-sample_time.hpp
|
||
|
|
*/
|
||
|
|
template<class... AN>
|
||
|
|
auto sample_with_time(AN&&... an)
|
||
|
|
-> operator_factory<sample_with_time_tag, AN...> {
|
||
|
|
return operator_factory<sample_with_time_tag, AN...>(std::make_tuple(std::forward<AN>(an)...));
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
template<>
|
||
|
|
struct member_overload<sample_with_time_tag>
|
||
|
|
{
|
||
|
|
template<class Observable, class Duration,
|
||
|
|
class Enabled = rxu::enable_if_all_true_type_t<
|
||
|
|
is_observable<Observable>,
|
||
|
|
rxu::is_duration<Duration>>,
|
||
|
|
class SourceValue = rxu::value_type_t<Observable>,
|
||
|
|
class SampleWithTime = rxo::detail::sample_with_time<SourceValue, rxu::decay_t<Duration>, identity_one_worker>>
|
||
|
|
static auto member(Observable&& o, Duration&& d)
|
||
|
|
-> decltype(o.template lift<SourceValue>(SampleWithTime(std::forward<Duration>(d), identity_current_thread()))) {
|
||
|
|
return o.template lift<SourceValue>(SampleWithTime(std::forward<Duration>(d), identity_current_thread()));
|
||
|
|
}
|
||
|
|
|
||
|
|
template<class Observable, class Coordination, class Duration,
|
||
|
|
class Enabled = rxu::enable_if_all_true_type_t<
|
||
|
|
is_observable<Observable>,
|
||
|
|
is_coordination<Coordination>,
|
||
|
|
rxu::is_duration<Duration>>,
|
||
|
|
class SourceValue = rxu::value_type_t<Observable>,
|
||
|
|
class SampleWithTime = rxo::detail::sample_with_time<SourceValue, rxu::decay_t<Duration>, rxu::decay_t<Coordination>>>
|
||
|
|
static auto member(Observable&& o, Coordination&& cn, Duration&& d)
|
||
|
|
-> decltype(o.template lift<SourceValue>(SampleWithTime(std::forward<Duration>(d), std::forward<Coordination>(cn)))) {
|
||
|
|
return o.template lift<SourceValue>(SampleWithTime(std::forward<Duration>(d), std::forward<Coordination>(cn)));
|
||
|
|
}
|
||
|
|
|
||
|
|
template<class Observable, class Coordination, class Duration,
|
||
|
|
class Enabled = rxu::enable_if_all_true_type_t<
|
||
|
|
is_observable<Observable>,
|
||
|
|
is_coordination<Coordination>,
|
||
|
|
rxu::is_duration<Duration>>,
|
||
|
|
class SourceValue = rxu::value_type_t<Observable>,
|
||
|
|
class SampleWithTime = rxo::detail::sample_with_time<SourceValue, rxu::decay_t<Duration>, rxu::decay_t<Coordination>>>
|
||
|
|
static auto member(Observable&& o, Duration&& d, Coordination&& cn)
|
||
|
|
-> decltype(o.template lift<SourceValue>(SampleWithTime(std::forward<Duration>(d), std::forward<Coordination>(cn)))) {
|
||
|
|
return o.template lift<SourceValue>(SampleWithTime(std::forward<Duration>(d), std::forward<Coordination>(cn)));
|
||
|
|
}
|
||
|
|
|
||
|
|
template<class... AN>
|
||
|
|
static operators::detail::sample_with_time_invalid_t<AN...> member(const AN&...) {
|
||
|
|
std::terminate();
|
||
|
|
return {};
|
||
|
|
static_assert(sizeof...(AN) == 10000, "sample_with_time takes (optional Coordination, required Duration) or (required Duration, optional Coordination)");
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif
|