277 lines
10 KiB
C++
277 lines
10 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-skip_until.hpp
|
|
|
|
\brief Make new observable with items skipped until on_next occurs on the trigger observable or until the specified time.
|
|
skip_until takes (TriggerObservable, optional Coordination) or (TimePoint, optional Coordination)
|
|
|
|
\tparam TriggerSource the type of the trigger observable.
|
|
\tparam Coordination the type of the scheduler (optional).
|
|
|
|
\param t an observable that has to emit an item before the source observable's elements begin to be mirrored by the resulting observable.
|
|
\param cn the scheduler to use for scheduling the items (optional).
|
|
|
|
\return An observable that skips items from the source observable until the second observable emits an item or the time runs out, then emits the remaining items.
|
|
|
|
\sample
|
|
\snippet skip_until.cpp skip_until sample
|
|
\snippet output.txt skip_until sample
|
|
|
|
\sample
|
|
\snippet skip_until.cpp threaded skip_until sample
|
|
\snippet output.txt threaded skip_until sample
|
|
*/
|
|
|
|
#if !defined(RXCPP_OPERATORS_RX_SKIP_UNTIL_HPP)
|
|
#define RXCPP_OPERATORS_RX_SKIP_UNTIL_HPP
|
|
|
|
#include "../rx-includes.hpp"
|
|
|
|
namespace rxcpp {
|
|
|
|
namespace operators {
|
|
|
|
namespace detail {
|
|
|
|
template<class... AN>
|
|
struct skip_until_invalid_arguments {};
|
|
|
|
template<class... AN>
|
|
struct skip_until_invalid : public rxo::operator_base<skip_until_invalid_arguments<AN...>> {
|
|
using type = observable<skip_until_invalid_arguments<AN...>, skip_until_invalid<AN...>>;
|
|
};
|
|
template<class... AN>
|
|
using skip_until_invalid_t = typename skip_until_invalid<AN...>::type;
|
|
|
|
template<class T, class Observable, class TriggerObservable, class Coordination>
|
|
struct skip_until : public operator_base<T>
|
|
{
|
|
typedef rxu::decay_t<Observable> source_type;
|
|
typedef rxu::decay_t<TriggerObservable> trigger_source_type;
|
|
typedef rxu::decay_t<Coordination> coordination_type;
|
|
typedef typename coordination_type::coordinator_type coordinator_type;
|
|
struct values
|
|
{
|
|
values(source_type s, trigger_source_type t, coordination_type sf)
|
|
: source(std::move(s))
|
|
, trigger(std::move(t))
|
|
, coordination(std::move(sf))
|
|
{
|
|
}
|
|
source_type source;
|
|
trigger_source_type trigger;
|
|
coordination_type coordination;
|
|
};
|
|
values initial;
|
|
|
|
skip_until(source_type s, trigger_source_type t, coordination_type sf)
|
|
: initial(std::move(s), std::move(t), std::move(sf))
|
|
{
|
|
}
|
|
|
|
struct mode
|
|
{
|
|
enum type {
|
|
skipping, // no messages from trigger
|
|
clear, // trigger completed
|
|
triggered, // trigger sent on_next
|
|
errored, // error either on trigger or on observable
|
|
stopped // observable completed
|
|
};
|
|
};
|
|
|
|
template<class Subscriber>
|
|
void on_subscribe(Subscriber s) const {
|
|
|
|
typedef Subscriber output_type;
|
|
struct state_type
|
|
: public std::enable_shared_from_this<state_type>
|
|
, public values
|
|
{
|
|
state_type(const values& i, coordinator_type coor, const output_type& oarg)
|
|
: values(i)
|
|
, mode_value(mode::skipping)
|
|
, coordinator(std::move(coor))
|
|
, out(oarg)
|
|
{
|
|
out.add(trigger_lifetime);
|
|
out.add(source_lifetime);
|
|
}
|
|
typename mode::type mode_value;
|
|
composite_subscription trigger_lifetime;
|
|
composite_subscription source_lifetime;
|
|
coordinator_type coordinator;
|
|
output_type out;
|
|
};
|
|
|
|
auto coordinator = initial.coordination.create_coordinator();
|
|
|
|
// take a copy of the values for each subscription
|
|
auto state = std::make_shared<state_type>(initial, std::move(coordinator), std::move(s));
|
|
|
|
auto trigger = on_exception(
|
|
[&](){return state->coordinator.in(state->trigger);},
|
|
state->out);
|
|
if (trigger.empty()) {
|
|
return;
|
|
}
|
|
|
|
auto source = on_exception(
|
|
[&](){return state->coordinator.in(state->source);},
|
|
state->out);
|
|
if (source.empty()) {
|
|
return;
|
|
}
|
|
|
|
auto sinkTrigger = make_subscriber<typename trigger_source_type::value_type>(
|
|
// share parts of subscription
|
|
state->out,
|
|
// new lifetime
|
|
state->trigger_lifetime,
|
|
// on_next
|
|
[state](const typename trigger_source_type::value_type&) {
|
|
if (state->mode_value != mode::skipping) {
|
|
return;
|
|
}
|
|
state->mode_value = mode::triggered;
|
|
state->trigger_lifetime.unsubscribe();
|
|
},
|
|
// on_error
|
|
[state](rxu::error_ptr e) {
|
|
if (state->mode_value != mode::skipping) {
|
|
return;
|
|
}
|
|
state->mode_value = mode::errored;
|
|
state->out.on_error(e);
|
|
},
|
|
// on_completed
|
|
[state]() {
|
|
if (state->mode_value != mode::skipping) {
|
|
return;
|
|
}
|
|
state->mode_value = mode::clear;
|
|
state->trigger_lifetime.unsubscribe();
|
|
}
|
|
);
|
|
auto selectedSinkTrigger = on_exception(
|
|
[&](){return state->coordinator.out(sinkTrigger);},
|
|
state->out);
|
|
if (selectedSinkTrigger.empty()) {
|
|
return;
|
|
}
|
|
trigger->subscribe(std::move(selectedSinkTrigger.get()));
|
|
|
|
source.get().subscribe(
|
|
// split subscription lifetime
|
|
state->source_lifetime,
|
|
// on_next
|
|
[state](T t) {
|
|
if (state->mode_value != mode::triggered) {
|
|
return;
|
|
}
|
|
state->out.on_next(t);
|
|
},
|
|
// on_error
|
|
[state](rxu::error_ptr e) {
|
|
if (state->mode_value > mode::triggered) {
|
|
return;
|
|
}
|
|
state->mode_value = mode::errored;
|
|
state->out.on_error(e);
|
|
},
|
|
// on_completed
|
|
[state]() {
|
|
if (state->mode_value != mode::triggered) {
|
|
return;
|
|
}
|
|
state->mode_value = mode::stopped;
|
|
state->out.on_completed();
|
|
}
|
|
);
|
|
}
|
|
};
|
|
|
|
}
|
|
|
|
/*! @copydoc rx-skip_until.hpp
|
|
*/
|
|
template<class... AN>
|
|
auto skip_until(AN&&... an)
|
|
-> operator_factory<skip_until_tag, AN...> {
|
|
return operator_factory<skip_until_tag, AN...>(std::make_tuple(std::forward<AN>(an)...));
|
|
}
|
|
|
|
}
|
|
|
|
template<>
|
|
struct member_overload<skip_until_tag>
|
|
{
|
|
template<class Observable, class TimePoint,
|
|
class Enabled = rxu::enable_if_all_true_type_t<
|
|
is_observable<Observable>,
|
|
std::is_convertible<TimePoint, rxsc::scheduler::clock_type::time_point>>,
|
|
class SourceValue = rxu::value_type_t<Observable>,
|
|
class Timer = typename rxu::defer_type<rxs::detail::timer, identity_one_worker>::type,
|
|
class TimerValue = rxu::value_type_t<Timer>,
|
|
class TriggerObservable = observable<TimerValue, Timer>,
|
|
class SkipUntil = rxo::detail::skip_until<SourceValue, rxu::decay_t<Observable>, TriggerObservable, identity_one_worker>,
|
|
class Value = rxu::value_type_t<SkipUntil>,
|
|
class Result = observable<Value, SkipUntil>>
|
|
static Result member(Observable&& o, TimePoint&& when) {
|
|
auto cn = identity_current_thread();
|
|
return Result(SkipUntil(std::forward<Observable>(o), rxs::timer(std::forward<TimePoint>(when), cn), cn));
|
|
}
|
|
|
|
template<class Observable, class TimePoint, class Coordination,
|
|
class Enabled = rxu::enable_if_all_true_type_t<
|
|
is_observable<Observable>,
|
|
is_coordination<Coordination>,
|
|
std::is_convertible<TimePoint, rxsc::scheduler::clock_type::time_point>>,
|
|
class SourceValue = rxu::value_type_t<Observable>,
|
|
class Timer = typename rxu::defer_type<rxs::detail::timer, rxu::decay_t<Coordination>>::type,
|
|
class TimerValue = rxu::value_type_t<Timer>,
|
|
class TriggerObservable = observable<TimerValue, Timer>,
|
|
class SkipUntil = rxo::detail::skip_until<SourceValue, rxu::decay_t<Observable>, TriggerObservable, rxu::decay_t<Coordination>>,
|
|
class Value = rxu::value_type_t<SkipUntil>,
|
|
class Result = observable<Value, SkipUntil>>
|
|
static Result member(Observable&& o, TimePoint&& when, Coordination cn) {
|
|
return Result(SkipUntil(std::forward<Observable>(o), rxs::timer(std::forward<TimePoint>(when), cn), cn));
|
|
}
|
|
|
|
template<class Observable, class TriggerObservable,
|
|
class Enabled = rxu::enable_if_all_true_type_t<
|
|
all_observables<Observable, TriggerObservable>>,
|
|
class SourceValue = rxu::value_type_t<Observable>,
|
|
class SkipUntil = rxo::detail::skip_until<SourceValue, rxu::decay_t<Observable>, rxu::decay_t<TriggerObservable>, identity_one_worker>,
|
|
class Value = rxu::value_type_t<SkipUntil>,
|
|
class Result = observable<Value, SkipUntil>>
|
|
static Result member(Observable&& o, TriggerObservable&& t) {
|
|
return Result(SkipUntil(std::forward<Observable>(o), std::forward<TriggerObservable>(t), identity_current_thread()));
|
|
}
|
|
|
|
template<class Observable, class TriggerObservable, class Coordination,
|
|
class Enabled = rxu::enable_if_all_true_type_t<
|
|
all_observables<Observable, TriggerObservable>,
|
|
is_coordination<Coordination>>,
|
|
class SourceValue = rxu::value_type_t<Observable>,
|
|
class SkipUntil = rxo::detail::skip_until<SourceValue, rxu::decay_t<Observable>, rxu::decay_t<TriggerObservable>, rxu::decay_t<Coordination>>,
|
|
class Value = rxu::value_type_t<SkipUntil>,
|
|
class Result = observable<Value, SkipUntil>>
|
|
static Result member(Observable&& o, TriggerObservable&& t, Coordination&& cn) {
|
|
return Result(SkipUntil(std::forward<Observable>(o), std::forward<TriggerObservable>(t), std::forward<Coordination>(cn)));
|
|
}
|
|
|
|
template<class... AN>
|
|
static operators::detail::skip_until_invalid_t<AN...> member(AN...) {
|
|
std::terminate();
|
|
return {};
|
|
static_assert(sizeof...(AN) == 10000, "skip_until takes (TriggerObservable, optional Coordination) or (TimePoint, optional Coordination)");
|
|
}
|
|
};
|
|
|
|
}
|
|
|
|
#endif
|