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/***
Olive - Non-Linear Video Editor
Copyright (C) 2019 Olive Team
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
***/
#include "taskmanager.h"
#include <QDebug>
#include <QThread>
OLIVE_NAMESPACE_ENTER
TaskManager* TaskManager::instance_ = nullptr;
TaskManager::TaskManager()
{
}
TaskManager::~TaskManager()
{
thread_pool_.clear();
foreach (Task* t, tasks_) {
t->Cancel();
}
thread_pool_.waitForDone();
foreach (Task* t, tasks_) {
t->deleteLater();
}
}
void TaskManager::CreateInstance()
{
instance_ = new TaskManager();
}
void TaskManager::DestroyInstance()
{
delete instance_;
instance_ = nullptr;
}
TaskManager *TaskManager::instance()
{
return instance_;
}
int TaskManager::GetTaskCount() const
{
return tasks_.size();
}
Task *TaskManager::GetFirstTask() const
{
return tasks_.begin().value();
}
void TaskManager::CancelTaskAndWait(Task* t)
{
t->Cancel();
QFutureWatcher<bool>* w = tasks_.key(t);
if (w) {
w->waitForFinished();
}
}
void TaskManager::AddTask(Task* t)
{
// Create a watcher for signalling
QFutureWatcher<bool>* watcher = new QFutureWatcher<bool>();
connect(watcher, &QFutureWatcher<bool>::finished, this, &TaskManager::TaskFinished);
// Add the Task to the queue
tasks_.insert(watcher, t);
// Run task concurrently
watcher->setFuture(QtConcurrent::run(t, &Task::Start));
// Emit signal that a Task was added
emit TaskAdded(t);
emit TaskListChanged();
}
void TaskManager::CancelTask(Task *t)
{
if (std::find(failed_tasks_.begin(), failed_tasks_.end(), t) != failed_tasks_.end()) {
failed_tasks_.remove(t);
emit TaskRemoved(t);
t->deleteLater();
} else {
t->Cancel();
}
}
void TaskManager::TaskFinished()
{
QFutureWatcher<bool>* watcher = static_cast<QFutureWatcher<bool>*>(sender());
Task* t = tasks_.value(watcher);
tasks_.remove(watcher);
if (watcher->result()) {
// Task completed successfully
emit TaskRemoved(t);
t->deleteLater();
} else {
// Task failed, keep it so the user can see the error message
emit TaskFailed(t);
failed_tasks_.push_back(t);
}
watcher->deleteLater();
emit TaskListChanged();
}
OLIVE_NAMESPACE_EXIT
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