93 lines
2.4 KiB
C
93 lines
2.4 KiB
C
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/*
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This file is part of Telegram Desktop,
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the official desktop version of Telegram messaging app, see https://telegram.org
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Telegram Desktop is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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It is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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In addition, as a special exception, the copyright holders give permission
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to link the code of portions of this program with the OpenSSL library.
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Full license: https://github.com/telegramdesktop/tdesktop/blob/master/LICENSE
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Copyright (c) 2014-2017 John Preston, https://desktop.telegram.org
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*/
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#pragma once
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#include "producer.h"
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#include "base/algorithm.h"
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namespace rpl {
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template <typename Value>
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class event_stream {
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public:
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event_stream();
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void fire(Value value);
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producer<Value, no_error> events();
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~event_stream();
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private:
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std::weak_ptr<event_stream*> weak() const {
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return _strong;
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}
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void addConsumer(consumer<Value, no_error> &&consumer) {
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_consumers.push_back(std::move(consumer));
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}
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void removeConsumer(const consumer<Value, no_error> &consumer) {
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auto it = base::find(_consumers, consumer);
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if (it != _consumers.end()) {
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it->terminate();
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}
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}
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std::shared_ptr<event_stream*> _strong;
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std::vector<consumer<Value, no_error>> _consumers;
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};
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template <typename Value>
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event_stream<Value>::event_stream()
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: _strong(std::make_shared<event_stream*>(this)) {
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}
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template <typename Value>
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void event_stream<Value>::fire(Value value) {
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base::push_back_safe_remove_if(_consumers, [&](auto &consumer) {
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return !consumer.putNext(value);
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});
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}
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template <typename Value>
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producer<Value, no_error> event_stream<Value>::events() {
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return producer<Value, no_error>([weak = weak()](consumer<Value, no_error> consumer) {
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if (auto strong = weak.lock()) {
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auto result = [weak, consumer] {
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if (auto strong = weak.lock()) {
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(*strong)->removeConsumer(consumer);
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}
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};
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(*strong)->addConsumer(std::move(consumer));
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return lifetime(std::move(result));
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}
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return lifetime();
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});
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}
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template <typename Value>
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event_stream<Value>::~event_stream() {
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for (auto &consumer : _consumers) {
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consumer.putDone();
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}
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}
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} // namespace rpl
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