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//
// TimedNotificationQueue.cpp
//
// Library: Foundation
// Package: Notifications
// Module: TimedNotificationQueue
//
// Copyright (c) 2009, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// SPDX-License-Identifier: BSL-1.0
//
#include "Poco/TimedNotificationQueue.h"
#include "Poco/Notification.h"
#include <limits>
namespace Poco {
TimedNotificationQueue::TimedNotificationQueue()
{
}
TimedNotificationQueue::~TimedNotificationQueue()
{
try
{
clear();
}
catch (...)
{
poco_unexpected();
}
}
void TimedNotificationQueue::enqueueNotification(Notification::Ptr pNotification, Timestamp timestamp)
{
poco_check_ptr (pNotification);
Timestamp tsNow;
Clock clock;
Timestamp::TimeDiff diff = timestamp - tsNow;
clock += diff;
FastMutex::ScopedLock lock(_mutex);
_nfQueue.insert(NfQueue::value_type(clock, pNotification));
_nfAvailable.set();
}
void TimedNotificationQueue::enqueueNotification(Notification::Ptr pNotification, Clock clock)
{
poco_check_ptr (pNotification);
FastMutex::ScopedLock lock(_mutex);
_nfQueue.insert(NfQueue::value_type(clock, pNotification));
_nfAvailable.set();
}
Notification* TimedNotificationQueue::dequeueNotification()
{
FastMutex::ScopedLock lock(_mutex);
NfQueue::iterator it = _nfQueue.begin();
if (it != _nfQueue.end())
{
Clock::ClockDiff sleep = -it->first.elapsed();
if (sleep <= 0)
{
Notification::Ptr pNf = it->second;
_nfQueue.erase(it);
return pNf.duplicate();
}
}
return 0;
}
Notification* TimedNotificationQueue::waitDequeueNotification()
{
for (;;)
{
_mutex.lock();
NfQueue::iterator it = _nfQueue.begin();
if (it != _nfQueue.end())
{
_mutex.unlock();
Clock::ClockDiff sleep = -it->first.elapsed();
if (sleep <= 0)
{
return dequeueOne(it).duplicate();
}
else if (!wait(sleep))
{
return dequeueOne(it).duplicate();
}
else continue;
}
else
{
_mutex.unlock();
}
_nfAvailable.wait();
}
}
Notification* TimedNotificationQueue::waitDequeueNotification(long milliseconds)
{
while (milliseconds >= 0)
{
_mutex.lock();
NfQueue::iterator it = _nfQueue.begin();
if (it != _nfQueue.end())
{
_mutex.unlock();
Clock now;
Clock::ClockDiff sleep = it->first - now;
if (sleep <= 0)
{
return dequeueOne(it).duplicate();
}
else if (sleep <= 1000*Clock::ClockDiff(milliseconds))
{
if (!wait(sleep))
{
return dequeueOne(it).duplicate();
}
else
{
milliseconds -= static_cast<long>((now.elapsed() + 999)/1000);
continue;
}
}
}
else
{
_mutex.unlock();
}
if (milliseconds > 0)
{
Clock now;
_nfAvailable.tryWait(milliseconds);
milliseconds -= static_cast<long>((now.elapsed() + 999)/1000);
}
else return 0;
}
return 0;
}
bool TimedNotificationQueue::wait(Clock::ClockDiff interval)
{
const Clock::ClockDiff MAX_SLEEP = 8*60*60*Clock::ClockDiff(1000000); // sleep at most 8 hours at a time
while (interval > 0)
{
Clock now;
Clock::ClockDiff sleep = interval <= MAX_SLEEP ? interval : MAX_SLEEP;
if (_nfAvailable.tryWait(static_cast<long>((sleep + 999)/1000)))
return true;
interval -= now.elapsed();
}
return false;
}
bool TimedNotificationQueue::empty() const
{
FastMutex::ScopedLock lock(_mutex);
return _nfQueue.empty();
}
int TimedNotificationQueue::size() const
{
FastMutex::ScopedLock lock(_mutex);
return static_cast<int>(_nfQueue.size());
}
void TimedNotificationQueue::clear()
{
FastMutex::ScopedLock lock(_mutex);
_nfQueue.clear();
}
Notification::Ptr TimedNotificationQueue::dequeueOne(NfQueue::iterator& it)
{
FastMutex::ScopedLock lock(_mutex);
Notification::Ptr pNf = it->second;
_nfQueue.erase(it);
return pNf;
}
} // namespace Poco
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