mirror of
https://github.com/strawberrymusicplayer/strawberry
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100 lines
2.9 KiB
C++
100 lines
2.9 KiB
C++
/* This file is part of Strawberry.
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Copyright 2011, David Sansome <me@davidsansome.com>
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Copyright 2018-2021, Jonas Kvinge <jonas@jkvinge.net>
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Strawberry 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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Strawberry 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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You should have received a copy of the GNU General Public License
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along with Strawberry. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef MESSAGEREPLY_H
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#define MESSAGEREPLY_H
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#include <QtGlobal>
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#include <QObject>
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#include <QSemaphore>
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#include <QString>
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#include <QTimer>
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#include "core/logging.h"
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// Base QObject for a reply future class that is returned immediately for requests that will occur in the background.
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// Similar to QNetworkReply. Use MessageReply instead.
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class _MessageReplyBase : public QObject {
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Q_OBJECT
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public:
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explicit _MessageReplyBase(QObject *parent = nullptr);
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virtual int id() const = 0;
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bool is_finished() const { return finished_; }
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bool is_successful() const { return success_; }
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// Waits for the reply to finish by waiting on a semaphore. Never call this from the MessageHandler's thread or it will block forever.
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// Returns true if the call was successful.
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bool WaitForFinished();
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void Abort();
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signals:
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void Finished();
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protected:
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bool finished_;
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bool success_;
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QSemaphore semaphore_;
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};
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// A reply future class that is returned immediately for requests that will occur in the background. Similar to QNetworkReply.
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template <typename MessageType>
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class MessageReply : public _MessageReplyBase {
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public:
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explicit MessageReply(const MessageType &request_message, QObject *parent = nullptr);
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int id() const override { return request_message_.id(); }
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const MessageType &request_message() const { return request_message_; }
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const MessageType &message() const { return reply_message_; }
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void SetReply(const MessageType &message);
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private:
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MessageType request_message_;
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MessageType reply_message_;
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};
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template<typename MessageType>
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MessageReply<MessageType>::MessageReply(const MessageType &request_message, QObject *parent) : _MessageReplyBase(parent) {
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request_message_.MergeFrom(request_message);
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}
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template<typename MessageType>
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void MessageReply<MessageType>::SetReply(const MessageType &message) {
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Q_ASSERT(!finished_);
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reply_message_.MergeFrom(message);
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finished_ = true;
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success_ = true;
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qLog(Debug) << "Releasing ID" << id() << "(finished)";
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// Delay the signal as workaround to fix the signal periodically not emitted.
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QTimer::singleShot(1, this, &_MessageReplyBase::Finished);
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semaphore_.release();
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}
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#endif // MESSAGEREPLY_H
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