C++ Pointer::InternalGetState方法代码示例

void JobManager::DoSchedule(InternalJob::Pointer job,
    Poco::Timestamp::TimeDiff delay)
{
  Poco::ScopedLock<Poco::Mutex> managerLock(m_mutex);

  //job may have been canceled already
  int state = job->InternalGetState();
  if (state != InternalJob::ABOUT_TO_SCHEDULE && state != Job::SLEEPING)
    return;

  //if it's a decoration job with no rule, don't run it right now if the system is busy
  if (job->GetPriority() == Job::DECORATE && job->GetRule() == 0)
  {
    Poco::Timestamp::TimeDiff tmp_minDelay = m_running.size() * 100;
    delay = std::max(delay, tmp_minDelay);
  }
  if (delay > 0)
  {
    job->SetStartTime(Poco::Timestamp() + delay * 100);
    InternalJob::Pointer sptr_job(job);
    ChangeState(sptr_job, Job::SLEEPING);
  }
  else
  {
    job->SetStartTime(Poco::Timestamp() + DelayFor(job->GetPriority()) * 100);
    job->SetWaitQueueStamp(m_waitQueueCounter++);
    InternalJob::Pointer sptr_job(job);
    ChangeState(sptr_job, Job::WAITING);
  }

}

bool JobManager::Sleep(InternalJob::Pointer job)
{
  {
    Poco::ScopedLock<Poco::Mutex> lockMe (m_mutex);
    InternalJob::Pointer sptr_job(job);
    switch (job->GetState())
    {
      case Job::RUNNING :
      //cannot be paused if it is already running (as opposed to ABOUT_TO_RUN)
      if (job->InternalGetState() == Job::RUNNING)
      return false;
      //job hasn't started running yet (aboutToRun listener)
      break;
      case Job::SLEEPING :
      //update the job wake time
      job->SetStartTime(InternalJob::T_INFINITE);
      //change state again to re-shuffle the sleep queue

      ChangeState(sptr_job, Job::SLEEPING);
      return true;
      case Job::NONE :
      return true;
      case Job::WAITING :
      //put the job to sleep
      break;
    }
    job->SetStartTime(InternalJob::T_INFINITE);
    ChangeState(sptr_job, Job::SLEEPING);
  }
  m_JobListeners.Sleeping(job.Cast<Job>());
  return true;
}

void JobManager::Schedule(InternalJob::Pointer job, Poco::Timestamp::TimeDiff delay, bool reschedule)
{
  if (!m_active)
  throw Poco::IllegalStateException("Job manager has been shut down.");

  poco_assert(job); // "Job is null"
  poco_assert(delay >= 0); // "Scheduling delay is negative"

  {
    Poco::ScopedLock<Poco::Mutex> managerLock (m_mutex);
    //if the job is already running, set it to be rescheduled when done
    if (job->GetState() == Job::RUNNING)
    {
      job->SetStartTime(delay);
      return;
    }
    //can't schedule a job that is waiting or sleeping
    if (job->InternalGetState() != Job::NONE)
    return;

    //remember that we are about to schedule the job
    //to prevent multiple schedule attempts from succeeding (bug 68452)
    InternalJob::Pointer sptr_job(job);
    ChangeState(sptr_job, InternalJob::ABOUT_TO_SCHEDULE);
  }
  //notify listeners outside sync block
  m_JobListeners.Scheduled(job.Cast<Job>(), delay, reschedule);
  //schedule the job
  DoSchedule(job, delay);
  //call the pool outside sync block to avoid deadlock
  m_Pool->JobQueued();
}

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;
}

void JobManager::ChangeState(InternalJob::Pointer sptr_job, int newState)
{

  bool blockedJobs = false;
  {
    Poco::ScopedLock<Poco::Mutex> m_managerLock(m_mutex);

    int tmp_oldState = sptr_job->InternalGetState();
    switch (tmp_oldState)
    {
    case Job::NONE:

    case InternalJob::ABOUT_TO_SCHEDULE:
      break;
    case InternalJob::BLOCKED:
      //remove this job from the linked list of blocked jobs
      sptr_job->Remove();
      break;
    case Job::WAITING:
      m_JobQueueWaiting.Remove(sptr_job);

      // assert(false, "Tried to remove a job that wasn't in the queue");
      break;
    case Job::SLEEPING:
      m_JobQueueSleeping.Remove(sptr_job);
      // assert(false, "Tried to remove a job that wasn't in the queue");

    case Job::RUNNING:
    case InternalJob::ABOUT_TO_RUN:
      m_running.remove(sptr_job);
      //add any blocked jobs back to the wait queue
      InternalJob::Pointer sptr_blocked(sptr_job->Previous());
      sptr_job->Remove();
      blockedJobs = sptr_blocked != 0;
      while (sptr_blocked != 0)
      {
        InternalJob::Pointer previous = sptr_blocked->Previous();
        ChangeState(sptr_blocked, Job::WAITING);
        sptr_blocked = previous;
      }
      break;
      // default :
      // Assert.isLegal(false, "Invalid job state: " + job + ", state: " + oldState);
    }

    sptr_job->InternalSetState(newState);
    switch (newState)
    {
    case Job::NONE:
      sptr_job->SetStartTime(InternalJob::T_NONE);
      sptr_job->SetWaitQueueStamp(InternalJob::T_NONE);
    case InternalJob::BLOCKED:
      break;
    case Job::WAITING:
      m_JobQueueWaiting.Enqueue(sptr_job);
      break;
    case Job::SLEEPING:
      //try {
      m_JobQueueSleeping.Enqueue(sptr_job);
      //} catch (RuntimeException e) {
      //  throw new RuntimeException("Error changing from state: " + oldState);
      //}
      break;
    case Job::RUNNING:
    case InternalJob::ABOUT_TO_RUN:
      sptr_job->SetStartTime(InternalJob::T_NONE);
      sptr_job->SetWaitQueueStamp(InternalJob::T_NONE);
      m_running.insert(sptr_job);
      break;
    case InternalJob::ABOUT_TO_SCHEDULE:
      break;
      //  default :
      //    Assert.isLegal(false, "Invalid job state: " + job + ", state: " + newState);
    }
  }

  //notify queue outside sync block
  if (blockedJobs)
    m_Pool->JobQueued();
}