124 lines
3.7 KiB
C++
124 lines
3.7 KiB
C++
// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
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#pragma once
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/*! \file rx-multicast.hpp
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\brief allows connections to the source to be independent of subscriptions.
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\tparam Subject the subject to multicast the source Observable.
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\param sub the subject.
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*/
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#if !defined(RXCPP_OPERATORS_RX_MULTICAST_HPP)
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#define RXCPP_OPERATORS_RX_MULTICAST_HPP
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#include "../rx-includes.hpp"
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namespace rxcpp {
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namespace operators {
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namespace detail {
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template<class... AN>
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struct multicast_invalid_arguments {};
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template<class... AN>
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struct multicast_invalid : public rxo::operator_base<multicast_invalid_arguments<AN...>> {
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using type = observable<multicast_invalid_arguments<AN...>, multicast_invalid<AN...>>;
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};
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template<class... AN>
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using multicast_invalid_t = typename multicast_invalid<AN...>::type;
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template<class T, class Observable, class Subject>
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struct multicast : public operator_base<T>
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{
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typedef rxu::decay_t<Observable> source_type;
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typedef rxu::decay_t<Subject> subject_type;
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struct multicast_state : public std::enable_shared_from_this<multicast_state>
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{
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multicast_state(source_type o, subject_type sub)
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: source(std::move(o))
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, subject_value(std::move(sub))
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{
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}
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source_type source;
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subject_type subject_value;
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rxu::detail::maybe<typename composite_subscription::weak_subscription> connection;
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};
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std::shared_ptr<multicast_state> state;
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multicast(source_type o, subject_type sub)
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: state(std::make_shared<multicast_state>(std::move(o), std::move(sub)))
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{
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}
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template<class Subscriber>
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void on_subscribe(Subscriber&& o) const {
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state->subject_value.get_observable().subscribe(std::forward<Subscriber>(o));
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}
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void on_connect(composite_subscription cs) const {
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if (state->connection.empty()) {
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auto destination = state->subject_value.get_subscriber();
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// the lifetime of each connect is nested in the subject lifetime
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state->connection.reset(destination.add(cs));
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auto localState = state;
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// when the connection is finished it should shutdown the connection
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cs.add(
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[destination, localState](){
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if (!localState->connection.empty()) {
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destination.remove(localState->connection.get());
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localState->connection.reset();
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}
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});
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// use cs not destination for lifetime of subscribe.
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state->source.subscribe(cs, destination);
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}
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}
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};
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}
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/*! @copydoc rx-multicast.hpp
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*/
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template<class... AN>
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auto multicast(AN&&... an)
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-> operator_factory<multicast_tag, AN...> {
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return operator_factory<multicast_tag, AN...>(std::make_tuple(std::forward<AN>(an)...));
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}
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}
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template<>
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struct member_overload<multicast_tag>
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{
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template<class Observable, class Subject,
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class Enabled = rxu::enable_if_all_true_type_t<
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is_observable<Observable>>,
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class SourceValue = rxu::value_type_t<Observable>,
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class Multicast = rxo::detail::multicast<SourceValue, rxu::decay_t<Observable>, rxu::decay_t<Subject>>,
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class Value = rxu::value_type_t<Multicast>,
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class Result = connectable_observable<Value, Multicast>>
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static Result member(Observable&& o, Subject&& sub) {
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return Result(Multicast(std::forward<Observable>(o), std::forward<Subject>(sub)));
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}
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template<class... AN>
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static operators::detail::multicast_invalid_t<AN...> member(AN...) {
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std::terminate();
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return {};
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static_assert(sizeof...(AN) == 10000, "multicast takes (Subject)");
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}
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};
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}
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#endif
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