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//
// Task.cpp
//
// Library: Foundation
// Package: Tasks
// Module: Tasks
//
// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// SPDX-License-Identifier: BSL-1.0
//
#include "Poco/Task.h"
#include "Poco/TaskManager.h"
#include "Poco/Exception.h"
#include <array>
namespace Poco {
Task::Task(const std::string& rName):
_name(rName),
_pOwner(0),
_progress(0),
_state(TASK_IDLE),
_cancelEvent(false)
{
}
Task::~Task()
{
}
void Task::cancel()
{
_state = TASK_CANCELLING;
_cancelEvent.set();
if (_pOwner)
_pOwner->taskCancelled(this);
}
void Task::reset()
{
_progress = 0.0;
_state = TASK_IDLE;
_cancelEvent.reset();
}
void Task::run()
{
TaskManager* pOwner = getOwner();
if (pOwner)
pOwner->taskStarted(this);
try
{
/** Task can be already cancelled.
* To prevent endless executing already cancelled task _state is assigned to TASK_RUNNING only if _state != TASK_CANCELLING
*/
std::array<TaskState, 3> allowed_states{TASK_IDLE, TASK_STARTING, TASK_FINISHED};
for (auto & expected : allowed_states)
if (_state.compare_exchange_strong(expected, TASK_RUNNING))
break;
if (_state == TASK_RUNNING)
runTask();
}
catch (Exception& exc)
{
if (pOwner)
pOwner->taskFailed(this, exc);
}
catch (std::exception& exc)
{
if (pOwner)
pOwner->taskFailed(this, SystemException(exc.what()));
}
catch (...)
{
if (pOwner)
pOwner->taskFailed(this, SystemException("unknown exception"));
}
_state = TASK_FINISHED;
if (pOwner)
pOwner->taskFinished(this);
}
bool Task::sleep(long milliseconds)
{
return _cancelEvent.tryWait(milliseconds);
}
void Task::setProgress(float taskProgress)
{
FastMutex::ScopedLock lock(_mutex);
if (_progress != taskProgress)
{
_progress = taskProgress;
if (_pOwner)
_pOwner->taskProgress(this, _progress);
}
}
void Task::setOwner(TaskManager* pOwner)
{
FastMutex::ScopedLock lock(_mutex);
_pOwner = pOwner;
}
void Task::setState(TaskState taskState)
{
_state = taskState;
}
void Task::postNotification(Notification* pNf)
{
poco_check_ptr (pNf);
FastMutex::ScopedLock lock(_mutex);
if (_pOwner)
{
_pOwner->postNotification(pNf);
}
}
} // namespace Poco
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