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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_RX_REPLAYSUBJECT_HPP)
#define RXCPP_RX_REPLAYSUBJECT_HPP
#include "../rx-includes.hpp"
namespace rxcpp {
namespace subjects {
namespace detail {
template<class Coordination>
struct replay_traits
{
typedef rxu::maybe<std::size_t> count_type;
typedef rxu::maybe<rxsc::scheduler::clock_type::duration> period_type;
typedef rxsc::scheduler::clock_type::time_point time_point_type;
typedef rxu::decay_t<Coordination> coordination_type;
typedef typename coordination_type::coordinator_type coordinator_type;
};
template<class T, class Coordination>
class replay_observer : public detail::multicast_observer<T>
{
typedef replay_observer<T, Coordination> this_type;
typedef detail::multicast_observer<T> base_type;
typedef replay_traits<Coordination> traits;
typedef typename traits::count_type count_type;
typedef typename traits::period_type period_type;
typedef typename traits::time_point_type time_point_type;
typedef typename traits::coordination_type coordination_type;
typedef typename traits::coordinator_type coordinator_type;
class replay_observer_state : public std::enable_shared_from_this<replay_observer_state>
{
mutable std::mutex lock;
mutable std::list<T> values;
mutable std::list<time_point_type> time_points;
mutable count_type count;
mutable period_type period;
mutable composite_subscription replayLifetime;
public:
mutable coordination_type coordination;
mutable coordinator_type coordinator;
private:
void remove_oldest() const {
values.pop_front();
if (!period.empty()) {
time_points.pop_front();
}
}
public:
~replay_observer_state(){
replayLifetime.unsubscribe();
}
explicit replay_observer_state(count_type _count, period_type _period, coordination_type _coordination, coordinator_type _coordinator, composite_subscription _replayLifetime)
: count(_count)
, period(_period)
, replayLifetime(_replayLifetime)
, coordination(std::move(_coordination))
, coordinator(std::move(_coordinator))
{
}
void add(T v) const {
std::unique_lock<std::mutex> guard(lock);
if (!count.empty()) {
if (values.size() == count.get())
remove_oldest();
}
if (!period.empty()) {
auto now = coordination.now();
while (!time_points.empty() && (now - time_points.front() > period.get()))
remove_oldest();
time_points.push_back(now);
}
values.push_back(std::move(v));
}
std::list<T> get() const {
std::unique_lock<std::mutex> guard(lock);
return values;
}
};
std::shared_ptr<replay_observer_state> state;
public:
replay_observer(count_type count, period_type period, coordination_type coordination, composite_subscription replayLifetime, composite_subscription subscriberLifetime)
: base_type(subscriberLifetime)
{
replayLifetime.add(subscriberLifetime);
auto coordinator = coordination.create_coordinator(replayLifetime);
state = std::make_shared<replay_observer_state>(std::move(count), std::move(period), std::move(coordination), std::move(coordinator), std::move(replayLifetime));
}
subscriber<T> get_subscriber() const {
return make_subscriber<T>(this->get_id(), this->get_subscription(), observer<T, detail::replay_observer<T, Coordination>>(*this)).as_dynamic();
}
std::list<T> get_values() const {
return state->get();
}
coordinator_type& get_coordinator() const {
return state->coordinator;
}
template<class V>
void on_next(V v) const {
state->add(v);
base_type::on_next(std::move(v));
}
};
}
template<class T, class Coordination>
class replay
{
typedef detail::replay_traits<Coordination> traits;
typedef typename traits::count_type count_type;
typedef typename traits::period_type period_type;
typedef typename traits::time_point_type time_point_type;
detail::replay_observer<T, Coordination> s;
public:
explicit replay(Coordination cn, composite_subscription cs = composite_subscription())
: s(count_type(), period_type(), cn, cs, composite_subscription{})
{
}
replay(std::size_t count, Coordination cn, composite_subscription cs = composite_subscription())
: s(count_type(std::move(count)), period_type(), cn, cs, composite_subscription{})
{
}
replay(rxsc::scheduler::clock_type::duration period, Coordination cn, composite_subscription cs = composite_subscription())
: s(count_type(), period_type(period), cn, cs, composite_subscription{})
{
}
replay(std::size_t count, rxsc::scheduler::clock_type::duration period, Coordination cn, composite_subscription cs = composite_subscription())
: s(count_type(count), period_type(period), cn, cs, composite_subscription{})
{
}
bool has_observers() const {
return s.has_observers();
}
std::list<T> get_values() const {
return s.get_values();
}
subscriber<T> get_subscriber() const {
return s.get_subscriber();
}
observable<T> get_observable() const {
auto keepAlive = s;
auto observable = make_observable_dynamic<T>([=](subscriber<T> o){
for (auto&& value: get_values()) {
o.on_next(value);
}
keepAlive.add(keepAlive.get_subscriber(), std::move(o));
});
return s.get_coordinator().in(observable);
}
};
}
}
#endif
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