614 lines
18 KiB
C++
614 lines
18 KiB
C++
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// 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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#if !defined(RXCPP_RX_SUBSCRIPTION_HPP)
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#define RXCPP_RX_SUBSCRIPTION_HPP
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#include "rx-includes.hpp"
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namespace rxcpp {
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namespace detail {
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template<class F>
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struct is_unsubscribe_function
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{
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struct not_void {};
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template<class CF>
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static auto check(int) -> decltype((*(CF*)nullptr)());
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template<class CF>
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static not_void check(...);
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static const bool value = std::is_same<decltype(check<rxu::decay_t<F>>(0)), void>::value;
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};
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}
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struct tag_subscription {};
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struct subscription_base {typedef tag_subscription subscription_tag;};
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template<class T>
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class is_subscription
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{
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template<class C>
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static typename C::subscription_tag* check(int);
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template<class C>
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static void check(...);
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public:
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static const bool value = std::is_convertible<decltype(check<rxu::decay_t<T>>(0)), tag_subscription*>::value;
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};
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template<class Unsubscribe>
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class static_subscription
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{
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typedef rxu::decay_t<Unsubscribe> unsubscribe_call_type;
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unsubscribe_call_type unsubscribe_call;
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static_subscription()
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{
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}
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public:
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static_subscription(const static_subscription& o)
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: unsubscribe_call(o.unsubscribe_call)
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{
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}
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static_subscription(static_subscription&& o)
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: unsubscribe_call(std::move(o.unsubscribe_call))
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{
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}
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static_subscription(unsubscribe_call_type s)
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: unsubscribe_call(std::move(s))
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{
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}
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void unsubscribe() const {
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unsubscribe_call();
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}
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};
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class subscription : public subscription_base
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{
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class base_subscription_state : public std::enable_shared_from_this<base_subscription_state>
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{
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base_subscription_state();
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public:
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explicit base_subscription_state(bool initial)
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: issubscribed(initial)
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{
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}
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virtual ~base_subscription_state() {}
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virtual void unsubscribe() {
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}
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std::atomic<bool> issubscribed;
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};
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public:
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typedef std::weak_ptr<base_subscription_state> weak_state_type;
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private:
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template<class I>
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struct subscription_state : public base_subscription_state
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{
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typedef rxu::decay_t<I> inner_t;
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subscription_state(inner_t i)
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: base_subscription_state(true)
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, inner(std::move(i))
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{
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}
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virtual void unsubscribe() {
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if (issubscribed.exchange(false)) {
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trace_activity().unsubscribe_enter(*this);
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inner.unsubscribe();
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trace_activity().unsubscribe_return(*this);
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}
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}
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inner_t inner;
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};
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protected:
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std::shared_ptr<base_subscription_state> state;
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friend bool operator<(const subscription&, const subscription&);
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friend bool operator==(const subscription&, const subscription&);
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private:
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subscription(weak_state_type w)
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: state(w.lock())
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{
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if (!state) {
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std::terminate();
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}
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}
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explicit subscription(std::shared_ptr<base_subscription_state> s)
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: state(std::move(s))
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{
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if (!state) {
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std::terminate();
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}
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}
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public:
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subscription()
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: state(std::make_shared<base_subscription_state>(false))
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{
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if (!state) {
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std::terminate();
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}
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}
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template<class U>
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explicit subscription(U u, typename std::enable_if<!is_subscription<U>::value, void**>::type = nullptr)
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: state(std::make_shared<subscription_state<U>>(std::move(u)))
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{
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if (!state) {
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std::terminate();
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}
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}
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template<class U>
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explicit subscription(U u, typename std::enable_if<!std::is_same<subscription, U>::value && is_subscription<U>::value, void**>::type = nullptr)
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// intentionally slice
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: state(std::move((*static_cast<subscription*>(&u)).state))
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{
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if (!state) {
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std::terminate();
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}
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}
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subscription(const subscription& o)
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: state(o.state)
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{
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if (!state) {
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std::terminate();
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}
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}
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subscription(subscription&& o)
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: state(std::move(o.state))
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{
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if (!state) {
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std::terminate();
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}
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}
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subscription& operator=(subscription o) {
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state = std::move(o.state);
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return *this;
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}
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bool is_subscribed() const {
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if (!state) {
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std::terminate();
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}
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return state->issubscribed;
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}
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void unsubscribe() const {
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if (!state) {
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std::terminate();
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}
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auto keepAlive = state;
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state->unsubscribe();
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}
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weak_state_type get_weak() {
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return state;
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}
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// Atomically promote weak subscription to strong.
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// Calls std::terminate if w has already expired.
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static subscription lock(weak_state_type w) {
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return subscription(w);
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}
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// Atomically try to promote weak subscription to strong.
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// Returns an empty maybe<> if w has already expired.
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static rxu::maybe<subscription> maybe_lock(weak_state_type w) {
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auto strong_subscription = w.lock();
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if (!strong_subscription) {
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return rxu::detail::maybe<subscription>{};
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} else {
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return rxu::detail::maybe<subscription>{subscription{std::move(strong_subscription)}};
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}
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}
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};
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inline bool operator<(const subscription& lhs, const subscription& rhs) {
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return lhs.state < rhs.state;
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}
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inline bool operator==(const subscription& lhs, const subscription& rhs) {
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return lhs.state == rhs.state;
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}
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inline bool operator!=(const subscription& lhs, const subscription& rhs) {
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return !(lhs == rhs);
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}
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inline auto make_subscription()
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-> subscription {
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return subscription();
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}
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template<class I>
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auto make_subscription(I&& i)
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-> typename std::enable_if<!is_subscription<I>::value && !detail::is_unsubscribe_function<I>::value,
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subscription>::type {
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return subscription(std::forward<I>(i));
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}
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template<class Unsubscribe>
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auto make_subscription(Unsubscribe&& u)
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-> typename std::enable_if<detail::is_unsubscribe_function<Unsubscribe>::value,
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subscription>::type {
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return subscription(static_subscription<Unsubscribe>(std::forward<Unsubscribe>(u)));
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}
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class composite_subscription;
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namespace detail {
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struct tag_composite_subscription_empty {};
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class composite_subscription_inner
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{
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private:
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typedef subscription::weak_state_type weak_subscription;
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struct composite_subscription_state : public std::enable_shared_from_this<composite_subscription_state>
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{
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// invariant: cannot access this data without the lock held.
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std::set<subscription> subscriptions;
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// double checked locking:
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// issubscribed must be loaded again after each lock acquisition.
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// invariant:
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// never call subscription::unsubscribe with lock held.
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std::mutex lock;
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// invariant: transitions from 'true' to 'false' exactly once, at any time.
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std::atomic<bool> issubscribed;
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~composite_subscription_state()
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{
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std::unique_lock<decltype(lock)> guard(lock);
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subscriptions.clear();
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}
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composite_subscription_state()
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: issubscribed(true)
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{
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}
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composite_subscription_state(tag_composite_subscription_empty)
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: issubscribed(false)
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{
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}
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// Atomically add 's' to the set of subscriptions.
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//
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// If unsubscribe() has already occurred, this immediately
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// calls s.unsubscribe().
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//
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// cs.unsubscribe() [must] happens-before s.unsubscribe()
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//
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// Due to the un-atomic nature of calling 's.unsubscribe()',
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// it is possible to observe the unintuitive
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// add(s)=>s.unsubscribe() prior
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// to any of the unsubscribe()=>sN.unsubscribe().
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inline weak_subscription add(subscription s) {
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if (!issubscribed) { // load.acq [seq_cst]
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s.unsubscribe();
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} else if (s.is_subscribed()) {
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std::unique_lock<decltype(lock)> guard(lock);
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if (!issubscribed) { // load.acq [seq_cst]
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// unsubscribe was called concurrently.
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guard.unlock();
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// invariant: do not call unsubscribe with lock held.
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s.unsubscribe();
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} else {
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subscriptions.insert(s);
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}
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}
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return s.get_weak();
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}
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// Atomically remove 'w' from the set of subscriptions.
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//
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// This does nothing if 'w' was already previously removed,
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// or refers to an expired value.
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inline void remove(weak_subscription w) {
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if (issubscribed) { // load.acq [seq_cst]
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rxu::maybe<subscription> maybe_subscription = subscription::maybe_lock(w);
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if (maybe_subscription.empty()) {
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// Do nothing if the subscription has already expired.
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return;
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}
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std::unique_lock<decltype(lock)> guard(lock);
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// invariant: subscriptions must be accessed under the lock.
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if (issubscribed) { // load.acq [seq_cst]
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subscription& s = maybe_subscription.get();
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subscriptions.erase(std::move(s));
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} // else unsubscribe() was called concurrently; this becomes a no-op.
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}
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}
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// Atomically clear all subscriptions that were observably added
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// (and not subsequently observably removed).
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//
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// Un-atomically call unsubscribe on those subscriptions.
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//
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// forall subscriptions in {add(s1),add(s2),...}
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// - {remove(s3), remove(s4), ...}:
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// cs.unsubscribe() || cs.clear() happens before s.unsubscribe()
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//
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// cs.unsubscribe() observed-before cs.clear ==> do nothing.
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inline void clear() {
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if (issubscribed) { // load.acq [seq_cst]
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std::unique_lock<decltype(lock)> guard(lock);
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if (!issubscribed) { // load.acq [seq_cst]
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// unsubscribe was called concurrently.
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return;
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}
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std::set<subscription> v(std::move(subscriptions));
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// invariant: do not call unsubscribe with lock held.
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guard.unlock();
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std::for_each(v.begin(), v.end(),
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[](const subscription& s) {
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s.unsubscribe(); });
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}
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}
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// Atomically clear all subscriptions that were observably added
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// (and not subsequently observably removed).
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//
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// Un-atomically call unsubscribe on those subscriptions.
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//
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// Switches to an 'unsubscribed' state, all subsequent
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// adds are immediately unsubscribed.
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//
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// cs.unsubscribe() [must] happens-before
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// cs.add(s) ==> s.unsubscribe()
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//
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// forall subscriptions in {add(s1),add(s2),...}
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// - {remove(s3), remove(s4), ...}:
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// cs.unsubscribe() || cs.clear() happens before s.unsubscribe()
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inline void unsubscribe() {
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if (issubscribed.exchange(false)) { // cas.acq_rel [seq_cst]
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std::unique_lock<decltype(lock)> guard(lock);
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// is_subscribed can only transition to 'false' once,
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// does not need an extra atomic access here.
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std::set<subscription> v(std::move(subscriptions));
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// invariant: do not call unsubscribe with lock held.
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guard.unlock();
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std::for_each(v.begin(), v.end(),
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[](const subscription& s) {
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s.unsubscribe(); });
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}
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}
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};
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public:
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typedef std::shared_ptr<composite_subscription_state> shared_state_type;
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protected:
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mutable shared_state_type state;
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public:
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composite_subscription_inner()
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: state(std::make_shared<composite_subscription_state>())
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{
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}
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composite_subscription_inner(tag_composite_subscription_empty et)
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||
|
|
: state(std::make_shared<composite_subscription_state>(et))
|
||
|
|
{
|
||
|
|
}
|
||
|
|
|
||
|
|
composite_subscription_inner(const composite_subscription_inner& o)
|
||
|
|
: state(o.state)
|
||
|
|
{
|
||
|
|
if (!state) {
|
||
|
|
std::terminate();
|
||
|
|
}
|
||
|
|
}
|
||
|
|
composite_subscription_inner(composite_subscription_inner&& o)
|
||
|
|
: state(std::move(o.state))
|
||
|
|
{
|
||
|
|
if (!state) {
|
||
|
|
std::terminate();
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
composite_subscription_inner& operator=(composite_subscription_inner o)
|
||
|
|
{
|
||
|
|
state = std::move(o.state);
|
||
|
|
if (!state) {
|
||
|
|
std::terminate();
|
||
|
|
}
|
||
|
|
return *this;
|
||
|
|
}
|
||
|
|
|
||
|
|
inline weak_subscription add(subscription s) const {
|
||
|
|
if (!state) {
|
||
|
|
std::terminate();
|
||
|
|
}
|
||
|
|
return state->add(std::move(s));
|
||
|
|
}
|
||
|
|
inline void remove(weak_subscription w) const {
|
||
|
|
if (!state) {
|
||
|
|
std::terminate();
|
||
|
|
}
|
||
|
|
state->remove(std::move(w));
|
||
|
|
}
|
||
|
|
inline void clear() const {
|
||
|
|
if (!state) {
|
||
|
|
std::terminate();
|
||
|
|
}
|
||
|
|
state->clear();
|
||
|
|
}
|
||
|
|
inline void unsubscribe() {
|
||
|
|
if (!state) {
|
||
|
|
std::terminate();
|
||
|
|
}
|
||
|
|
state->unsubscribe();
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
inline composite_subscription shared_empty();
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
/*!
|
||
|
|
\brief controls lifetime for scheduler::schedule and observable<T, SourceOperator>::subscribe.
|
||
|
|
|
||
|
|
\ingroup group-core
|
||
|
|
|
||
|
|
*/
|
||
|
|
class composite_subscription
|
||
|
|
: protected detail::composite_subscription_inner
|
||
|
|
, public subscription
|
||
|
|
{
|
||
|
|
typedef detail::composite_subscription_inner inner_type;
|
||
|
|
public:
|
||
|
|
typedef subscription::weak_state_type weak_subscription;
|
||
|
|
|
||
|
|
composite_subscription(detail::tag_composite_subscription_empty et)
|
||
|
|
: inner_type(et)
|
||
|
|
, subscription() // use empty base
|
||
|
|
{
|
||
|
|
}
|
||
|
|
|
||
|
|
public:
|
||
|
|
|
||
|
|
composite_subscription()
|
||
|
|
: inner_type()
|
||
|
|
, subscription(*static_cast<const inner_type*>(this))
|
||
|
|
{
|
||
|
|
}
|
||
|
|
|
||
|
|
composite_subscription(const composite_subscription& o)
|
||
|
|
: inner_type(o)
|
||
|
|
, subscription(static_cast<const subscription&>(o))
|
||
|
|
{
|
||
|
|
}
|
||
|
|
composite_subscription(composite_subscription&& o)
|
||
|
|
: inner_type(std::move(o))
|
||
|
|
, subscription(std::move(static_cast<subscription&>(o)))
|
||
|
|
{
|
||
|
|
}
|
||
|
|
|
||
|
|
composite_subscription& operator=(composite_subscription o)
|
||
|
|
{
|
||
|
|
inner_type::operator=(std::move(o));
|
||
|
|
subscription::operator=(std::move(*static_cast<subscription*>(&o)));
|
||
|
|
return *this;
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline composite_subscription empty() {
|
||
|
|
return detail::shared_empty();
|
||
|
|
}
|
||
|
|
|
||
|
|
using subscription::is_subscribed;
|
||
|
|
using subscription::unsubscribe;
|
||
|
|
|
||
|
|
using inner_type::clear;
|
||
|
|
|
||
|
|
inline weak_subscription add(subscription s) const {
|
||
|
|
if (s == static_cast<const subscription&>(*this)) {
|
||
|
|
// do not nest the same subscription
|
||
|
|
std::terminate();
|
||
|
|
//return s.get_weak();
|
||
|
|
}
|
||
|
|
auto that = this->subscription::state.get();
|
||
|
|
trace_activity().subscription_add_enter(*that, s);
|
||
|
|
auto w = inner_type::add(std::move(s));
|
||
|
|
trace_activity().subscription_add_return(*that);
|
||
|
|
return w;
|
||
|
|
}
|
||
|
|
|
||
|
|
template<class F>
|
||
|
|
auto add(F f) const
|
||
|
|
-> typename std::enable_if<detail::is_unsubscribe_function<F>::value, weak_subscription>::type {
|
||
|
|
return add(make_subscription(std::move(f)));
|
||
|
|
}
|
||
|
|
|
||
|
|
inline void remove(weak_subscription w) const {
|
||
|
|
auto that = this->subscription::state.get();
|
||
|
|
trace_activity().subscription_remove_enter(*that, w);
|
||
|
|
inner_type::remove(w);
|
||
|
|
trace_activity().subscription_remove_return(*that);
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
inline bool operator<(const composite_subscription& lhs, const composite_subscription& rhs) {
|
||
|
|
return static_cast<const subscription&>(lhs) < static_cast<const subscription&>(rhs);
|
||
|
|
}
|
||
|
|
inline bool operator==(const composite_subscription& lhs, const composite_subscription& rhs) {
|
||
|
|
return static_cast<const subscription&>(lhs) == static_cast<const subscription&>(rhs);
|
||
|
|
}
|
||
|
|
inline bool operator!=(const composite_subscription& lhs, const composite_subscription& rhs) {
|
||
|
|
return !(lhs == rhs);
|
||
|
|
}
|
||
|
|
|
||
|
|
namespace detail {
|
||
|
|
|
||
|
|
inline composite_subscription shared_empty() {
|
||
|
|
static composite_subscription shared_empty = composite_subscription(tag_composite_subscription_empty());
|
||
|
|
return shared_empty;
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
template<class T>
|
||
|
|
class resource : public subscription_base
|
||
|
|
{
|
||
|
|
public:
|
||
|
|
typedef typename composite_subscription::weak_subscription weak_subscription;
|
||
|
|
|
||
|
|
resource()
|
||
|
|
: lifetime(composite_subscription())
|
||
|
|
, value(std::make_shared<rxu::detail::maybe<T>>())
|
||
|
|
{
|
||
|
|
}
|
||
|
|
|
||
|
|
explicit resource(T t, composite_subscription cs = composite_subscription())
|
||
|
|
: lifetime(std::move(cs))
|
||
|
|
, value(std::make_shared<rxu::detail::maybe<T>>(rxu::detail::maybe<T>(std::move(t))))
|
||
|
|
{
|
||
|
|
auto localValue = value;
|
||
|
|
lifetime.add(
|
||
|
|
[localValue](){
|
||
|
|
localValue->reset();
|
||
|
|
}
|
||
|
|
);
|
||
|
|
}
|
||
|
|
|
||
|
|
T& get() {
|
||
|
|
return value.get()->get();
|
||
|
|
}
|
||
|
|
composite_subscription& get_subscription() {
|
||
|
|
return lifetime;
|
||
|
|
}
|
||
|
|
|
||
|
|
bool is_subscribed() const {
|
||
|
|
return lifetime.is_subscribed();
|
||
|
|
}
|
||
|
|
weak_subscription add(subscription s) const {
|
||
|
|
return lifetime.add(std::move(s));
|
||
|
|
}
|
||
|
|
template<class F>
|
||
|
|
auto add(F f) const
|
||
|
|
-> typename std::enable_if<detail::is_unsubscribe_function<F>::value, weak_subscription>::type {
|
||
|
|
return lifetime.add(make_subscription(std::move(f)));
|
||
|
|
}
|
||
|
|
void remove(weak_subscription w) const {
|
||
|
|
return lifetime.remove(std::move(w));
|
||
|
|
}
|
||
|
|
void clear() const {
|
||
|
|
return lifetime.clear();
|
||
|
|
}
|
||
|
|
void unsubscribe() const {
|
||
|
|
return lifetime.unsubscribe();
|
||
|
|
}
|
||
|
|
|
||
|
|
protected:
|
||
|
|
composite_subscription lifetime;
|
||
|
|
std::shared_ptr<rxu::detail::maybe<T>> value;
|
||
|
|
};
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif
|