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MessageQueue.h
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executable file
·117 lines (94 loc) · 3.1 KB
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// Copyright (c) 2012-2017, The CryptoNote developers, The Bytecoin developers
//
// This file is part of Bytecoin.
//
// Bytecoin is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Bytecoin is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with Bytecoin. If not, see <http://www.gnu.org/licenses/>.
#pragma once
#include <queue>
#include "IntrusiveLinkedList.h"
#include "System/Dispatcher.h"
#include "System/Event.h"
#include "System/InterruptedException.h"
namespace CryptoNote {
template <class MessageType> class MessageQueue {
public:
MessageQueue(System::Dispatcher& dispatcher);
const MessageType& front();
void pop();
void push(const MessageType& message);
void stop();
private:
friend class IntrusiveLinkedList<MessageQueue<MessageType>>;
typename IntrusiveLinkedList<MessageQueue<MessageType>>::hook& getHook();
void wait();
System::Dispatcher& dispatcher;
std::queue<MessageType> messageQueue;
System::Event event;
bool stopped;
typename IntrusiveLinkedList<MessageQueue<MessageType>>::hook hook;
};
template <class MessageQueueContainer, class MessageType> class MesageQueueGuard {
public:
MesageQueueGuard(MessageQueueContainer& container, MessageQueue<MessageType>& messageQueue)
: container(container), messageQueue(messageQueue) {
container.addMessageQueue(messageQueue);
}
~MesageQueueGuard() {
container.removeMessageQueue(messageQueue);
}
private:
MessageQueueContainer& container;
MessageQueue<MessageType>& messageQueue;
};
template <class MessageType>
MessageQueue<MessageType>::MessageQueue(System::Dispatcher& dispatch)
: dispatcher(dispatch), event(dispatch), stopped(false) {
}
template <class MessageType> void MessageQueue<MessageType>::wait() {
if (messageQueue.empty()) {
if (stopped) {
throw System::InterruptedException();
}
event.clear();
while (!event.get()) {
event.wait();
if (stopped) {
throw System::InterruptedException();
}
}
}
}
template <class MessageType> const MessageType& MessageQueue<MessageType>::front() {
wait();
return messageQueue.front();
}
template <class MessageType> void MessageQueue<MessageType>::pop() {
wait();
messageQueue.pop();
}
template <class MessageType> void MessageQueue<MessageType>::push(const MessageType& message) {
dispatcher.remoteSpawn([=]() mutable {
messageQueue.push(std::move(message));
event.set();
});
}
template <class MessageType> void MessageQueue<MessageType>::stop() {
stopped = true;
event.set();
}
template <class MessageType>
typename IntrusiveLinkedList<MessageQueue<MessageType>>::hook& MessageQueue<MessageType>::getHook() {
return hook;
}
}