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