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#include "ConcurrentTask.h"
#include <QDebug>
#include <QCoreApplication>
ConcurrentTask::ConcurrentTask(QObject* parent, QString task_name, int max_concurrent)
: Task(parent), m_name(task_name), m_total_max_size(max_concurrent)
{ setObjectName(task_name); }
ConcurrentTask::~ConcurrentTask()
{
for (auto task : m_queue) {
if (task)
task->deleteLater();
}
}
auto ConcurrentTask::getStepProgress() const -> qint64
{
return m_stepProgress;
}
auto ConcurrentTask::getStepTotalProgress() const -> qint64
{
return m_stepTotalProgress;
}
void ConcurrentTask::addTask(Task::Ptr task)
{
m_queue.append(task);
}
void ConcurrentTask::executeTask()
{
// Start the least amount of tasks needed, but at least one
int num_starts = qMax(1, qMin(m_total_max_size, m_queue.size()));
for (int i = 0; i < num_starts; i++) {
QMetaObject::invokeMethod(this, &ConcurrentTask::startNext, Qt::QueuedConnection);
}
}
bool ConcurrentTask::abort()
{
m_queue.clear();
m_aborted = true;
if (m_doing.isEmpty()) {
// Don't call emitAborted() here, we want to bypass the 'is the task running' check
emit aborted();
emit finished();
return true;
}
bool suceedeed = true;
QMutableHashIterator<Task*, Task::Ptr> doing_iter(m_doing);
while (doing_iter.hasNext()) {
auto task = doing_iter.next();
suceedeed &= (task.value())->abort();
}
if (suceedeed)
emitAborted();
else
emitFailed(tr("Failed to abort all running tasks."));
return suceedeed;
}
void ConcurrentTask::clear()
{
Q_ASSERT(!isRunning());
m_done.clear();
m_failed.clear();
m_queue.clear();
m_aborted = false;
m_progress = 0;
m_stepProgress = 0;
}
void ConcurrentTask::startNext()
{
if (m_aborted || m_doing.count() > m_total_max_size)
return;
if (m_queue.isEmpty() && m_doing.isEmpty() && !wasSuccessful()) {
emitSucceeded();
return;
}
if (m_queue.isEmpty())
return;
Task::Ptr next = m_queue.dequeue();
connect(next.get(), &Task::succeeded, this, [this, next] { subTaskSucceeded(next); });
connect(next.get(), &Task::failed, this, [this, next](QString msg) { subTaskFailed(next, msg); });
connect(next.get(), &Task::status, this, &ConcurrentTask::subTaskStatus);
connect(next.get(), &Task::stepStatus, this, &ConcurrentTask::subTaskStatus);
connect(next.get(), &Task::progress, this, &ConcurrentTask::subTaskProgress);
m_doing.insert(next.get(), next);
setStepStatus(next->isMultiStep() ? next->getStepStatus() : next->getStatus());
updateState();
QCoreApplication::processEvents();
QMetaObject::invokeMethod(next.get(), &Task::start, Qt::QueuedConnection);
// Allow going up the number of concurrent tasks in case of tasks being added in the middle of a running task.
int num_starts = m_total_max_size - m_doing.size();
for (int i = 0; i < num_starts; i++)
QMetaObject::invokeMethod(this, &ConcurrentTask::startNext, Qt::QueuedConnection);
}
void ConcurrentTask::subTaskSucceeded(Task::Ptr task)
{
m_done.insert(task.get(), task);
m_doing.remove(task.get());
disconnect(task.get(), 0, this, 0);
updateState();
startNext();
}
void ConcurrentTask::subTaskFailed(Task::Ptr task, const QString& msg)
{
m_done.insert(task.get(), task);
m_failed.insert(task.get(), task);
m_doing.remove(task.get());
disconnect(task.get(), 0, this, 0);
updateState();
startNext();
}
void ConcurrentTask::subTaskStatus(const QString& msg)
{
setStepStatus(msg);
}
void ConcurrentTask::subTaskProgress(qint64 current, qint64 total)
{
m_stepProgress = current;
m_stepTotalProgress = total;
}
void ConcurrentTask::updateState()
{
setProgress(m_done.count(), totalSize());
setStatus(tr("Executing %1 task(s) (%2 out of %3 are done)")
.arg(QString::number(m_doing.count()), QString::number(m_done.count()), QString::number(totalSize())));
}
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