Examples of org.waveprotocol.wave.client.scheduler.Scheduler

Package org.waveprotocol.wave.client.scheduler

Examples of org.waveprotocol.wave.client.scheduler.Scheduler

org.waveprotocol.wave.client.scheduler.Scheduler
Unified interface for scheduling asynchronous work. This interface provides a relatively compact set of methods and sub-interfaces for dealing with the varying task scheduling concerns of the single-threaded web client. The central idea is that scheduling the same job more than once (where "same" is defined by object identity) overrides the previous scheduling of that same job. Contract:
- The exact order of execution of jobs with equal priorities and delays is undefined
- The semantics of scheduling a job with any of the schedule variant methods below are identical to doing that but also calling cancel on it first. For example, this means that the delay timer is reset, and the priority is changed to the most recent value.
- Scheduling a job is the same as scheduling a delayed job with a delay of zero
- Scheduling a repeating process with a positive delay but zero interval is the same as scheduling a delayed process
- Scheduling an incremental task is the same as scheduling a repeating incremental task with a delay and interval both of zero
- If the interval of a repeating job is too small and enough happens before it is next up for being run so that it "deserves" to be run more than once, the additional runs are dropped. They are not queued up or "owed" to it in any way.
NOTE(danilatos): There is currently no mechanism for jobs to be notified of cancellation. The reason is that code written to depend on this sort of functionality can suffer from difficult to debug race conditions. Ideally code should be structured differently, so that it does not need this facility. If it is really needed, it can also be implemented on top of this scheduler fairly simply. We might revisit this decision if it later turns out to be a much needed feature, in which case there are some easy changes to be made here to allow it. @author danilatos@google.com (Daniel Danilatos)

    notedSelectionCoordsChanged |= selectionCoordsChanged;
    notedSelectionLocationChanged |= selectionLocationChanged;
    notedContentChanged |= contentChanged;
    notedUserDirectlyChangedContent |= userDirectlyChangedContent;


    Scheduler scheduler = SchedulerInstance.get();
    if (!scheduler.isScheduled(notificationTask)) {
      scheduler.scheduleRepeating(Priority.MEDIUM, notificationTask,
          INITIAL_NOTIFY_SCHEDULE_DELAY_MS, NOTIFY_SCHEDULE_DELAY_GAP_MS);
    } else {
      notifyAgain = true;
    }
  }

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    MutationHandler handler = getMutationHandler(element);
    if (handler != null) {
      mutatedElements.add(element);
    }


    Scheduler scheduler = SchedulerInstance.get();
    if (!scheduler.isScheduled(mutationNotificationTask)) {
      scheduler.scheduleDelayed(Priority.MEDIUM, mutationNotificationTask,
          NOTIFY_SCHEDULE_DELAY_MS);
    }
  }

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    MutationHandler handler = getMutationHandler(element);
    if (handler != null) {
      mutatedElements.add(element);
    }


    Scheduler scheduler = SchedulerInstance.get();
    if (!scheduler.isScheduled(mutationNotificationTask)) {
      scheduler.scheduleDelayed(Priority.MEDIUM, mutationNotificationTask,
          NOTIFY_SCHEDULE_DELAY_MS);
    }
  }

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    notedSelectionCoordsChanged |= selectionCoordsChanged;
    notedSelectionLocationChanged |= selectionLocationChanged;
    notedContentChanged |= contentChanged;
    notedUserDirectlyChangedContent |= userDirectlyChangedContent;


    Scheduler scheduler = SchedulerInstance.get();
    if (!scheduler.isScheduled(notificationTask)) {
      scheduler.scheduleRepeating(Priority.MEDIUM, notificationTask,
          INITIAL_NOTIFY_SCHEDULE_DELAY_MS, NOTIFY_SCHEDULE_DELAY_GAP_MS);
    } else {
      notifyAgain = true;
    }
  }

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