feat add rxcpp

3party/rxcpp/operators/rx-subscribe_on.hpp

@@ -0,0 +1,182 @@
+// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
+
+#pragma once
+
+/*! \file rx-subscribe_on.hpp
+
+    \brief Subscription and unsubscription are queued and delivered using the scheduler from the supplied coordination.
+
+    \tparam Coordination  the type of the scheduler.
+
+    \param  cn  the scheduler to perform subscription actions on.
+
+    \return  The source observable modified so that its subscriptions happen on the specified scheduler.
+
+    \sample
+    \snippet subscribe_on.cpp subscribe_on sample
+    \snippet output.txt subscribe_on sample
+
+    Invoking rxcpp::observable::observe_on operator, instead of subscribe_on, gives following results:
+    \snippet output.txt observe_on sample
+*/
+
+#if !defined(RXCPP_OPERATORS_RX_SUBSCRIBE_ON_HPP)
+#define RXCPP_OPERATORS_RX_SUBSCRIBE_ON_HPP
+
+#include "../rx-includes.hpp"
+
+namespace rxcpp {
+
+namespace operators {
+
+namespace detail {
+
+template<class... AN>
+struct subscribe_on_invalid_arguments {};
+
+template<class... AN>
+struct subscribe_on_invalid : public rxo::operator_base<subscribe_on_invalid_arguments<AN...>> {
+    using type = observable<subscribe_on_invalid_arguments<AN...>, subscribe_on_invalid<AN...>>;
+};
+template<class... AN>
+using subscribe_on_invalid_t = typename subscribe_on_invalid<AN...>::type;
+
+template<class T, class Observable, class Coordination>
+struct subscribe_on : public operator_base<T>
+{
+    typedef rxu::decay_t<Observable> source_type;
+    typedef rxu::decay_t<Coordination> coordination_type;
+    typedef typename coordination_type::coordinator_type coordinator_type;
+    struct subscribe_on_values
+    {
+        ~subscribe_on_values()
+        {
+        }
+        subscribe_on_values(source_type s, coordination_type sf)
+            : source(std::move(s))
+            , coordination(std::move(sf))
+        {
+        }
+        source_type source;
+        coordination_type coordination;
+    private:
+        subscribe_on_values& operator=(subscribe_on_values o) RXCPP_DELETE;
+    };
+    const subscribe_on_values initial;
+
+    ~subscribe_on()
+    {
+    }
+    subscribe_on(source_type s, coordination_type sf)
+        : initial(std::move(s), std::move(sf))
+    {
+    }
+
+    template<class Subscriber>
+    void on_subscribe(Subscriber s) const {
+
+        typedef Subscriber output_type;
+        struct subscribe_on_state_type
+            : public std::enable_shared_from_this<subscribe_on_state_type>
+            , public subscribe_on_values
+        {
+            subscribe_on_state_type(const subscribe_on_values& i, const output_type& oarg)
+                : subscribe_on_values(i)
+                , out(oarg)
+            {
+            }
+            composite_subscription source_lifetime;
+            output_type out;
+        private:
+            subscribe_on_state_type& operator=(subscribe_on_state_type o) RXCPP_DELETE;
+        };
+
+        composite_subscription coordinator_lifetime;
+
+        auto coordinator = initial.coordination.create_coordinator(coordinator_lifetime);
+
+        auto controller = coordinator.get_worker();
+
+        // take a copy of the values for each subscription
+        auto state = std::make_shared<subscribe_on_state_type>(initial, std::move(s));
+
+        auto sl = state->source_lifetime;
+        auto ol = state->out.get_subscription();
+
+        auto disposer = [=](const rxsc::schedulable&){
+            sl.unsubscribe();
+            ol.unsubscribe();
+            coordinator_lifetime.unsubscribe();
+        };
+        auto selectedDisposer = on_exception(
+            [&](){return coordinator.act(disposer);},
+            state->out);
+        if (selectedDisposer.empty()) {
+            return;
+        }
+        
+        state->source_lifetime.add([=](){
+            controller.schedule(selectedDisposer.get());
+        });
+
+        state->out.add([=](){
+            sl.unsubscribe();
+            ol.unsubscribe();
+            coordinator_lifetime.unsubscribe();
+        });
+
+        auto producer = [=](const rxsc::schedulable&){
+            state->source.subscribe(state->source_lifetime, state->out);
+        };
+
+        auto selectedProducer = on_exception(
+            [&](){return coordinator.act(producer);},
+            state->out);
+        if (selectedProducer.empty()) {
+            return;
+        }
+
+        controller.schedule(selectedProducer.get());
+    }
+private:
+    subscribe_on& operator=(subscribe_on o) RXCPP_DELETE;
+};
+
+}
+
+/*! @copydoc rx-subscribe_on.hpp
+*/
+template<class... AN>
+auto subscribe_on(AN&&... an)
+    ->      operator_factory<subscribe_on_tag, AN...> {
+     return operator_factory<subscribe_on_tag, AN...>(std::make_tuple(std::forward<AN>(an)...));
+}
+
+}
+
+template<>
+struct member_overload<subscribe_on_tag>
+{
+    template<class Observable, class Coordination,
+        class Enabled = rxu::enable_if_all_true_type_t<
+            is_observable<Observable>,
+            is_coordination<Coordination>>,
+        class SourceValue = rxu::value_type_t<Observable>,
+        class SubscribeOn = rxo::detail::subscribe_on<SourceValue, rxu::decay_t<Observable>, rxu::decay_t<Coordination>>,
+        class Value = rxu::value_type_t<SubscribeOn>,
+        class Result = observable<Value, SubscribeOn>>
+    static Result member(Observable&& o, Coordination&& cn) {
+        return Result(SubscribeOn(std::forward<Observable>(o), std::forward<Coordination>(cn)));
+    }
+
+    template<class... AN>
+    static operators::detail::subscribe_on_invalid_t<AN...> member(AN...) {
+        std::terminate();
+        return {};
+        static_assert(sizeof...(AN) == 10000, "subscribe_on takes (Coordination)");
+    }
+};
+
+}
+
+#endif