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/*
* Copyright (C) 2016+ AzerothCore <www.azerothcore.org>, released under GNU GPL v2 license, you may redistribute it and/or modify it under version 2 of the License, or (at your option), any later version.
* Copyright (C) 2008-2016 TrinityCore <http://www.trinitycore.org/>
* Copyright (C) 2005-2009 MaNGOS <http://getmangos.com/>
*/
#ifndef LOCKEDQUEUE_H
#define LOCKEDQUEUE_H
#include "Debugging/Errors.h"
#include <ace/Guard_T.h>
#include <ace/Thread_Mutex.h>
#include <cassert>
#include <deque>
namespace ACE_Based
{
template <class T, class LockType, typename StorageType = std::deque<T>>
class LockedQueue
{
//! Lock access to the queue.
LockType _lock;
//! Storage backing the queue.
StorageType _queue;
//! Cancellation flag.
volatile bool _canceled{false};
public:
//! Create a LockedQueue.
LockedQueue()
{
}
//! Destroy a LockedQueue.
virtual ~LockedQueue() = default;
//! Adds an item to the queue.
void add(const T& item)
{
lock();
//ASSERT(!this->_canceled);
// throw Cancellation_Exception();
_queue.push_back(item);
unlock();
}
//! Gets the next result in the queue, if any.
bool next(T& result)
{
// ACE_Guard<LockType> g(this->_lock);
ACE_GUARD_RETURN (LockType, g, this->_lock, false);
if (_queue.empty())
return false;
//ASSERT (!_queue.empty() || !this->_canceled);
// throw Cancellation_Exception();
result = _queue.front();
_queue.pop_front();
return true;
}
template<class Checker>
bool next(T& result, Checker& check)
{
ACE_Guard<LockType> g(this->_lock);
if (_queue.empty())
return false;
result = _queue.front();
if (!check.Process(result))
return false;
_queue.pop_front();
return true;
}
//! Peeks at the top of the queue. Check if the queue is empty before calling! Remember to unlock after use if autoUnlock == false.
T& peek(bool autoUnlock = false)
{
lock();
T& result = _queue.front();
if (autoUnlock)
unlock();
return result;
}
//! Cancels the queue.
void cancel()
{
lock();
_canceled = true;
unlock();
}
//! Checks if the queue is cancelled.
bool cancelled()
{
ACE_Guard<LockType> g(this->_lock);
return _canceled;
}
//! Locks the queue for access.
void lock()
{
this->_lock.acquire();
}
//! Unlocks the queue.
void unlock()
{
this->_lock.release();
}
///! Calls pop_front of the queue
void pop_front()
{
ACE_GUARD (LockType, g, this->_lock);
_queue.pop_front();
}
///! Checks if we're empty or not with locks held
bool empty()
{
ACE_GUARD_RETURN (LockType, g, this->_lock, false);
return _queue.empty();
}
};
}
#endif
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