175 lines
4.5 KiB
C++
175 lines
4.5 KiB
C++
/*
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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) 2014-2016 John Preston, https://desktop.telegram.org
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*/
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#include "stdafx.h"
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#include "core/observer.h"
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namespace Notify {
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namespace internal {
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namespace {
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struct StartCallbackData {
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void *that;
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StartCallback call;
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};
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struct FinishCallbackData {
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void *that;
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FinishCallback call;
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};
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struct UnregisterCallbackData {
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void *that;
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UnregisterCallback call;
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};
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using StartCallbacksList = QVector<StartCallbackData>;
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using FinishCallbacksList = QVector<FinishCallbackData>;
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NeverFreedPointer<StartCallbacksList> StartCallbacks;
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NeverFreedPointer<FinishCallbacksList> FinishCallbacks;
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UnregisterCallbackData UnregisterCallbacks[256]/* = { nullptr }*/;
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ObservedEvent LastRegisteredEvent/* = 0*/;
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} // namespace
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} // namespace internal
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void startObservers() {
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if (!internal::StartCallbacks) return;
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for (auto &callback : *internal::StartCallbacks) {
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callback.call(callback.that);
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}
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}
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void finishObservers() {
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if (!internal::FinishCallbacks) return;
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for (auto &callback : *internal::FinishCallbacks) {
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callback.call(callback.that);
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}
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internal::StartCallbacks.clear();
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internal::FinishCallbacks.clear();
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}
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namespace internal {
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BaseObservedEventRegistrator::BaseObservedEventRegistrator(void *that
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, StartCallback startCallback
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, FinishCallback finishCallback
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, UnregisterCallback unregisterCallback) {
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_event = LastRegisteredEvent++;
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StartCallbacks.makeIfNull();
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StartCallbacks->push_back({ that, startCallback });
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FinishCallbacks.makeIfNull();
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FinishCallbacks->push_back({ that, finishCallback });
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UnregisterCallbacks[_event] = { that, unregisterCallback };
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}
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} // namespace internal
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// Observer base interface.
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Observer::~Observer() {
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for_const (auto connection, _connections) {
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unregisterObserver(connection);
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}
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}
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void Observer::observerRegistered(ConnectionId connection) {
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_connections.push_back(connection);
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}
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void unregisterObserver(ConnectionId connection) {
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auto event = static_cast<internal::ObservedEvent>(connection >> 24);
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auto connectionIndex = int(connection & 0x00FFFFFFU) - 1;
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auto &callback = internal::UnregisterCallbacks[event];
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if (connectionIndex >= 0 && callback.call && callback.that) {
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callback.call(callback.that, connectionIndex);
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}
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}
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namespace internal {
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void observerRegisteredDefault(Observer *observer, ConnectionId connection) {
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observer->observerRegistered(connection);
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}
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} // namespace internal
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} // namespace Notify
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namespace base {
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namespace internal {
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namespace {
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bool CantUseObservables = false;
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struct ObservableListWrap {
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~ObservableListWrap() {
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CantUseObservables = true;
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}
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OrderedSet<ObservableCallHandlers*> list;
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};
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ObservableListWrap &PendingObservables() {
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static ObservableListWrap result;
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return result;
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}
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ObservableListWrap &ActiveObservables() {
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static ObservableListWrap result;
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return result;
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}
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} // namespace
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void RegisterPendingObservable(ObservableCallHandlers *handlers) {
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if (CantUseObservables) return;
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PendingObservables().list.insert(handlers);
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Global::RefHandleObservables().call();
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}
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void UnregisterActiveObservable(ObservableCallHandlers *handlers) {
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if (CantUseObservables) return;
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ActiveObservables().list.remove(handlers);
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}
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void UnregisterObservable(ObservableCallHandlers *handlers) {
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if (CantUseObservables) return;
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PendingObservables().list.remove(handlers);
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ActiveObservables().list.remove(handlers);
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}
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} // namespace internal
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void HandleObservables() {
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if (internal::CantUseObservables) return;
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auto &active = internal::ActiveObservables().list;
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qSwap(active, internal::PendingObservables().list);
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while (!active.empty()) {
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auto first = *active.begin();
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(*first)();
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if (!active.empty() && *active.begin() == first) {
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active.erase(active.begin());
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}
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}
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}
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} // namespace base
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