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// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
#pragma once
#if !defined(RXCPP_OPERATORS_RX_BUFFER_WITH_TIME_HPP)
#define RXCPP_OPERATORS_RX_BUFFER_WITH_TIME_HPP
#include "../rx-includes.hpp"
namespace rxcpp {
namespace operators {
namespace detail {
template<class T, class Duration, class Coordination>
struct buffer_with_time
{
static_assert(std::is_convertible<Duration, rxsc::scheduler::clock_type::duration>::value, "Duration parameter must convert to rxsc::scheduler::clock_type::duration");
static_assert(is_coordination<Coordination>::value, "Coordination parameter must satisfy the requirements for a Coordination");
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 buffer_with_time_values
{
buffer_with_time_values(duration_type p, duration_type s, coordination_type c)
: period(p)
, skip(s)
, coordination(c)
{
}
duration_type period;
duration_type skip;
coordination_type coordination;
};
buffer_with_time_values initial;
buffer_with_time(duration_type period, duration_type skip, coordination_type coordination)
: initial(period, skip, coordination)
{
}
template<class Subscriber>
struct buffer_with_time_observer
{
typedef buffer_with_time_observer<Subscriber> this_type;
typedef std::vector<T> value_type;
typedef rxu::decay_t<Subscriber> dest_type;
typedef observer<value_type, this_type> observer_type;
struct buffer_with_time_subscriber_values : public buffer_with_time_values
{
buffer_with_time_subscriber_values(dest_type d, buffer_with_time_values v, coordinator_type c)
: buffer_with_time_values(v)
, dest(std::move(d))
, coordinator(std::move(c))
, worker(std::move(coordinator.get_worker()))
, expected(worker.now())
{
}
dest_type dest;
coordinator_type coordinator;
rxsc::worker worker;
mutable std::deque<value_type> chunks;
rxsc::scheduler::clock_type::time_point expected;
};
std::shared_ptr<buffer_with_time_subscriber_values> state;
buffer_with_time_observer(dest_type d, buffer_with_time_values v, coordinator_type c)
: state(std::make_shared<buffer_with_time_subscriber_values>(buffer_with_time_subscriber_values(std::move(d), v, std::move(c))))
{
auto localState = state;
auto produce_buffer = [localState](const rxsc::schedulable&) {
localState->dest.on_next(std::move(localState->chunks.front()));
localState->chunks.pop_front();
};
auto create_buffer = [localState, produce_buffer](const rxsc::schedulable&) {
localState->chunks.emplace_back();
auto produce_at = localState->expected + localState->period;
localState->expected += localState->skip;
localState->worker.schedule(produce_at, produce_buffer);
};
state->worker.schedule_periodically(
state->expected,
state->skip,
create_buffer);
}
void on_next(T v) const {
for(auto& chunk : state->chunks) {
chunk.push_back(v);
}
}
void on_error(std::exception_ptr e) const {
state->dest.on_error(e);
}
void on_completed() const {
auto done = on_exception(
[&](){
while (!state->chunks.empty()) {
state->dest.on_next(std::move(state->chunks.front()));
state->chunks.pop_front();
}
return true;
},
state->dest);
if (done.empty()) {
return;
}
state->dest.on_completed();
}
static subscriber<T, observer<T, this_type>> make(dest_type d, buffer_with_time_values v) {
auto cs = d.get_subscription();
auto coordinator = v.coordination.create_coordinator(cs);
return make_subscriber<T>(std::move(cs), this_type(std::move(d), std::move(v), std::move(coordinator)));
}
};
template<class Subscriber>
auto operator()(Subscriber dest) const
-> decltype(buffer_with_time_observer<Subscriber>::make(std::move(dest), initial)) {
return buffer_with_time_observer<Subscriber>::make(std::move(dest), initial);
}
};
template<class Duration, class Coordination>
class buffer_with_time_factory
{
typedef rxu::decay_t<Duration> duration_type;
typedef rxu::decay_t<Coordination> coordination_type;
duration_type period;
duration_type skip;
coordination_type coordination;
public:
buffer_with_time_factory(duration_type p, duration_type s, coordination_type c) : period(p), skip(s), coordination(c) {}
template<class Observable>
auto operator()(Observable&& source)
-> decltype(source.template lift<std::vector<rxu::value_type_t<rxu::decay_t<Observable>>>>(buffer_with_time<rxu::value_type_t<rxu::decay_t<Observable>>, Duration, Coordination>(period, skip, coordination))) {
return source.template lift<std::vector<rxu::value_type_t<rxu::decay_t<Observable>>>>(buffer_with_time<rxu::value_type_t<rxu::decay_t<Observable>>, Duration, Coordination>(period, skip, coordination));
}
};
}
template<class Duration, class Coordination>
inline auto buffer_with_time(Duration period, Coordination coordination)
-> detail::buffer_with_time_factory<Duration, Coordination> {
return detail::buffer_with_time_factory<Duration, Coordination>(period, period, coordination);
}
template<class Duration, class Coordination>
inline auto buffer_with_time(Duration period, Duration skip, Coordination coordination)
-> detail::buffer_with_time_factory<Duration, Coordination> {
return detail::buffer_with_time_factory<Duration, Coordination>(period, skip, coordination);
}
}
}
#endif
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