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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_SYNCHRONIZE_HPP)
#define RXCPP_RX_SYNCHRONIZE_HPP
#include "../rx-includes.hpp"
namespace rxcpp {
namespace subjects {
namespace detail {
template<class T, class Coordination>
class synchronize_observer : public detail::multicast_observer<T>
{
typedef synchronize_observer<T, Coordination> this_type;
typedef detail::multicast_observer<T> base_type;
typedef rxu::decay_t<Coordination> coordination_type;
typedef typename coordination_type::coordinator_type coordinator_type;
typedef typename coordinator_type::template get<subscriber<T>>::type output_type;
struct synchronize_observer_state : public std::enable_shared_from_this<synchronize_observer_state>
{
typedef rxn::notification<T> notification_type;
typedef typename notification_type::type base_notification_type;
typedef std::deque<base_notification_type> queue_type;
struct mode
{
enum type {
Invalid = 0,
Processing,
Empty,
Disposed
};
};
mutable std::mutex lock;
mutable std::condition_variable wake;
mutable queue_type fill_queue;
composite_subscription lifetime;
mutable typename mode::type current;
coordinator_type coordinator;
output_type destination;
void ensure_processing(std::unique_lock<std::mutex>& guard) const {
if (!guard.owns_lock()) {
std::terminate();
}
if (current == mode::Empty) {
current = mode::Processing;
auto keepAlive = this->shared_from_this();
auto drain_queue = [keepAlive, this](const rxsc::schedulable& self){
RXCPP_TRY {
std::unique_lock<std::mutex> guard(lock);
if (!destination.is_subscribed()) {
current = mode::Disposed;
fill_queue.clear();
guard.unlock();
lifetime.unsubscribe();
return;
}
if (fill_queue.empty()) {
current = mode::Empty;
return;
}
auto notification = std::move(fill_queue.front());
fill_queue.pop_front();
guard.unlock();
notification->accept(destination);
self();
} RXCPP_CATCH(...) {
destination.on_error(rxu::current_exception());
std::unique_lock<std::mutex> guard(lock);
current = mode::Empty;
}
};
auto selectedDrain = on_exception(
[&](){return coordinator.act(drain_queue);},
destination);
if (selectedDrain.empty()) {
return;
}
auto processor = coordinator.get_worker();
processor.schedule(lifetime, selectedDrain.get());
}
}
synchronize_observer_state(coordinator_type coor, composite_subscription cs, output_type scbr)
: lifetime(std::move(cs))
, current(mode::Empty)
, coordinator(std::move(coor))
, destination(std::move(scbr))
{
}
template<class V>
void on_next(V v) const {
if (lifetime.is_subscribed()) {
std::unique_lock<std::mutex> guard(lock);
fill_queue.push_back(notification_type::on_next(std::move(v)));
ensure_processing(guard);
}
wake.notify_one();
}
void on_error(rxu::error_ptr e) const {
if (lifetime.is_subscribed()) {
std::unique_lock<std::mutex> guard(lock);
fill_queue.push_back(notification_type::on_error(e));
ensure_processing(guard);
}
wake.notify_one();
}
void on_completed() const {
if (lifetime.is_subscribed()) {
std::unique_lock<std::mutex> guard(lock);
fill_queue.push_back(notification_type::on_completed());
ensure_processing(guard);
}
wake.notify_one();
}
};
std::shared_ptr<synchronize_observer_state> state;
public:
synchronize_observer(coordination_type cn, composite_subscription dl, composite_subscription il)
: base_type(dl)
{
auto o = make_subscriber<T>(dl, make_observer_dynamic<T>( *static_cast<base_type*>(this) ));
// creates a worker whose lifetime is the same as the destination subscription
auto coordinator = cn.create_coordinator(dl);
state = std::make_shared<synchronize_observer_state>(std::move(coordinator), std::move(il), std::move(o));
}
subscriber<T> get_subscriber() const {
return make_subscriber<T>(this->get_id(), state->lifetime, observer<T, detail::synchronize_observer<T, Coordination>>(*this)).as_dynamic();
}
template<class V>
void on_next(V v) const {
state->on_next(std::move(v));
}
void on_error(rxu::error_ptr e) const {
state->on_error(e);
}
void on_completed() const {
state->on_completed();
}
};
}
template<class T, class Coordination>
class synchronize
{
detail::synchronize_observer<T, Coordination> s;
public:
explicit synchronize(Coordination cn, composite_subscription cs = composite_subscription())
: s(std::move(cn), std::move(cs), composite_subscription())
{
}
bool has_observers() const {
return s.has_observers();
}
subscriber<T> get_subscriber() const {
return s.get_subscriber();
}
observable<T> get_observable() const {
auto keepAlive = s;
return make_observable_dynamic<T>([=](subscriber<T> o){
keepAlive.add(keepAlive.get_subscriber(), std::move(o));
});
}
};
}
class synchronize_in_one_worker : public coordination_base
{
rxsc::scheduler factory;
class input_type
{
rxsc::worker controller;
rxsc::scheduler factory;
identity_one_worker coordination;
public:
explicit input_type(rxsc::worker w)
: controller(w)
, factory(rxsc::make_same_worker(w))
, coordination(factory)
{
}
inline rxsc::worker get_worker() const {
return controller;
}
inline rxsc::scheduler get_scheduler() const {
return factory;
}
inline rxsc::scheduler::clock_type::time_point now() const {
return factory.now();
}
template<class Observable>
auto in(Observable o) const
-> decltype(o.publish_synchronized(coordination).ref_count()) {
return o.publish_synchronized(coordination).ref_count();
}
template<class Subscriber>
auto out(Subscriber s) const
-> Subscriber {
return s;
}
template<class F>
auto act(F f) const
-> F {
return f;
}
};
public:
explicit synchronize_in_one_worker(rxsc::scheduler sc) : factory(sc) {}
typedef coordinator<input_type> coordinator_type;
inline rxsc::scheduler::clock_type::time_point now() const {
return factory.now();
}
inline coordinator_type create_coordinator(composite_subscription cs = composite_subscription()) const {
auto w = factory.create_worker(std::move(cs));
return coordinator_type(input_type(std::move(w)));
}
};
inline synchronize_in_one_worker synchronize_event_loop() {
static synchronize_in_one_worker r(rxsc::make_event_loop());
return r;
}
inline synchronize_in_one_worker synchronize_new_thread() {
static synchronize_in_one_worker r(rxsc::make_new_thread());
return r;
}
}
#endif
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