168 lines
3.0 KiB
C++
168 lines
3.0 KiB
C++
/***
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Olive - Non-Linear Video Editor
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Copyright (C) 2019 Olive Team
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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***/
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#include "task.h"
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Task::Task() :
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status_(kWaiting),
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thread_(this),
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text_(tr("Task")),
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cancelled_(false)
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{
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connect(&thread_, SIGNAL(finished()), this, SLOT(ThreadComplete()));
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}
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bool Task::Start()
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{
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// Tasks can only start if they're waiting
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if (status_ != kWaiting) {
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return false;
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}
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// Check if this task has any dependencies (tasks that should complete before this one starts)
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for (int i=0;i<dependencies_.size();i++) {
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Task* dependency = dependencies_.at(i);
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if (dependency->status() == kWaiting || dependency->status() == kWorking) {
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// We need this task to finish before this task can start, so keep waiting
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return false;
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} else if (dependency->status() == kError) {
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// A dependency errored, so this task is likely invalid too
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set_error(tr("A dependency task failed"));
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set_status(kError);
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return false;
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}
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}
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cancelled_ = false;
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set_status(kWorking);
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thread_.start();
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return true;
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}
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bool Task::Action()
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{
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return true;
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}
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const Task::Status &Task::status()
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{
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return status_;
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}
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const QString &Task::text()
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{
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return text_;
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}
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const QString &Task::error()
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{
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return error_;
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}
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void Task::AddDependency(Task *dependency)
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{
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// Dependencies cannot be added if the Task is working or complete
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Q_ASSERT(status_ == kWaiting);
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dependencies_.append(dependency);
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}
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void Task::EmitRemovedSignal()
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{
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emit Removed();
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}
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void Task::ResetState()
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{
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if (status_ == kWaiting) {
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return;
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}
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if (status_ == kWorking) {
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Cancel();
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}
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cancelled_ = false;
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set_error(QString());
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set_status(kWaiting);
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}
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void Task::Cancel()
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{
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if (status_ == kWaiting) {
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set_status(kFinished);
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}
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if (status_ != kWorking) {
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return;
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}
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cancelled_ = true;
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// FIXME: Should we limit the wait time?
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thread_.wait();
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}
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void Task::set_error(const QString &s)
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{
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error_ = s;
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}
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void Task::set_text(const QString &s)
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{
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text_ = s;
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}
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bool Task::cancelled()
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{
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return cancelled_;
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}
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void Task::set_status(const Task::Status &status)
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{
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status_ = status;
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emit StatusChanged(status_);
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}
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void Task::ThreadComplete()
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{
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// thread_.result() will be set to the return value of Action()
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if (thread_.result()) {
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set_status(kFinished);
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} else {
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set_status(kError);
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}
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emit Finished();
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}
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