bool JobManager::Cancel(InternalJob::Pointer sptr_job)
{
IProgressMonitor::Pointer sptr_progressMonitor(nullptr);
bool runCanceling = false;
{
Poco::ScopedLock<Poco::Mutex> mangerMutex (m_mutex);
switch (sptr_job->GetState())
{
case Job::NONE :
return true;
case Job::RUNNING :
//cannot cancel a job that has already started (as opposed to ABOUT_TO_RUN)
if (sptr_job->InternalGetState() == Job::RUNNING)
{
sptr_progressMonitor = sptr_job->GetProgressMonitor();
runCanceling = sptr_job->IsRunCanceled();
if(runCanceling)
sptr_job->SetRunCanceled(true);
break ;
}
//signal that the job should be canceled before it gets a chance to run
sptr_job->SetAboutToRunCanceled(true);
return false;
default :
ChangeState(sptr_job, Job::NONE);
}
}
//call monitor outside sync block
if (sptr_progressMonitor != 0)
{
if(runCanceling)
{
if (!sptr_progressMonitor->IsCanceled())
sptr_progressMonitor->SetCanceled(true);
sptr_job->Canceling();
}
return false;
}
//only notify listeners if the job was waiting or sleeping
m_JobListeners.Done(sptr_job.Cast<Job>(), Status::CANCEL_STATUS(BERRY_STATUS_LOC), false);
return true;
}
Job::Pointer JobManager::StartJob()
{
Job::Pointer job(nullptr);
while (true)
{
job = NextJob();
if (!job)
return Job::Pointer(nullptr);
//must perform this outside sync block because it is third party code
bool shouldRun = job->ShouldRun();
//check for listener veto
if (shouldRun)
m_JobListeners.AboutToRun(job);
//listeners may have canceled or put the job to sleep
bool endJob = false;
{
Poco::ScopedLock<Poco::Mutex> lock(m_mutex);
InternalJob::Pointer internal = job;
if (internal->InternalGetState() == InternalJob::ABOUT_TO_RUN)
{
if (shouldRun && !internal->IsAboutToRunCanceled())
{
internal->SetProgressMonitor(CreateMonitor(job));
//change from ABOUT_TO_RUN to RUNNING
internal->InternalSetState(Job::RUNNING);
break;
}
internal->SetAboutToRunCanceled(false);
endJob = true;
//fall through and end the job below
}
}
if (endJob)
{
//job has been vetoed or canceled, so mark it as done
EndJob(job,Status::CANCEL_STATUS(BERRY_STATUS_LOC), true);
continue;
}
}
m_JobListeners.Running(job);
return job;
}