/// <summary>
/// Attempt to retrieve reminders, that are my responsibility, from the global reminder table when starting this silo (reminder service instance)
/// </summary>
/// <returns></returns>
public async Task Start()
{
myRange = ring.GetMyRange();
logger.Info(ErrorCode.RS_ServiceStarting, "Starting reminder system target on: {0} x{1,8:X8}, with range {2}", Silo, Silo.GetConsistentHashCode(), myRange);
await reminderTable.Init(config, logger).WithTimeout(initTimeout);
await ReadAndUpdateReminders();
logger.Info(ErrorCode.RS_ServiceStarted, "Reminder system target started OK on: {0} x{1,8:X8}, with range {2}", Silo, Silo.GetConsistentHashCode(), myRange);
status = ReminderServiceStatus.Started;
startedTask.TrySetResult(true);
var random = new SafeRandom();
var dueTime = random.NextTimeSpan(Constants.RefreshReminderList);
listRefresher = GrainTimer.FromTaskCallback(
_ => ReadAndUpdateReminders(),
null,
dueTime,
Constants.RefreshReminderList,
name: "ReminderService.ReminderListRefresher");
listRefresher.Start();
ring.SubscribeToRangeChangeEvents(this);
}
internal LocalReminderService(
SiloAddress addr,
GrainId id,
IConsistentRingProvider ring,
OrleansTaskScheduler localScheduler,
IReminderTable reminderTable,
GlobalConfiguration config,
TimeSpan initTimeout)
: base(id, addr)
{
logger = TraceLogger.GetLogger("ReminderService", TraceLogger.LoggerType.Runtime);
localReminders = new Dictionary <ReminderIdentity, LocalReminderData>();
this.ring = ring;
scheduler = localScheduler;
this.reminderTable = reminderTable;
this.config = config;
this.initTimeout = initTimeout;
status = ReminderServiceStatus.Booting;
myRange = null;
localTableSequence = 0;
tardinessStat = AverageTimeSpanStatistic.FindOrCreate(StatisticNames.REMINDERS_AVERAGE_TARDINESS_SECONDS);
IntValueStatistic.FindOrCreate(StatisticNames.REMINDERS_NUMBER_ACTIVE_REMINDERS, () => localReminders.Count);
ticksDeliveredStat = CounterStatistic.FindOrCreate(StatisticNames.REMINDERS_COUNTERS_TICKS_DELIVERED);
startedTask = new TaskCompletionSource <bool>();
}
/// <summary>
/// Attempt to retrieve reminders, that are my responsibility, from the global reminder table when starting this silo (reminder service instance)
/// </summary>
/// <returns></returns>
public async Task Start()
{
myRange = ring.GetMyRange();
logger.Info(ErrorCode.RS_ServiceStarting, "Starting reminder system target on: {0} x{1,8:X8}, with range {2}", Silo, Silo.GetConsistentHashCode(), myRange);
// in case reminderTable is as grain, poke the grain to activate it, before slamming it with multipel parallel requests, which may create duplicate activations.
await reminderTable.Init();
await ReadAndUpdateReminders();
logger.Info(ErrorCode.RS_ServiceStarted, "Reminder system target started OK on: {0} x{1,8:X8}, with range {2}", Silo, Silo.GetConsistentHashCode(), myRange);
status = ReminderServiceStatus.Started;
startedTask.TrySetResult(true);
var random = new SafeRandom();
var dueTime = random.NextTimeSpan(Constants.RefreshReminderList);
listRefresher = GrainTimer.FromTaskCallback(
_ => ReadAndUpdateReminders(),
null,
dueTime,
Constants.RefreshReminderList,
name: "ReminderService.ReminderListRefresher");
listRefresher.Start();
ring.SubscribeToRangeChangeEvents(this);
}
private void PromoteToStarted()
{
if (stoppedCancellationTokenSource.IsCancellationRequested)
{
return;
}
logger.Info(ErrorCode.RS_ServiceStarted, "Reminder system target started OK on: {0} x{1,8:X8}, with range {2}", this.Silo, this.Silo.GetConsistentHashCode(), this.myRange);
status = ReminderServiceStatus.Started;
startedTask.TrySetResult(true);
var random = new SafeRandom();
var dueTime = random.NextTimeSpan(Constants.RefreshReminderList);
if (listRefreshTimer != null)
{
listRefreshTimer.Dispose();
}
listRefreshTimer = GrainTimer.FromTaskCallback(
_ => ReadAndUpdateReminders(),
null,
dueTime,
Constants.RefreshReminderList,
name: "ReminderService.ReminderListRefresher");
listRefreshTimer.Start();
ring.SubscribeToRangeChangeEvents(this);
}
public Task Stop()
{
logger.Info(ErrorCode.RS_ServiceStopping, "Stopping reminder system target");
status = ReminderServiceStatus.Stopped;
ring.UnSubscribeFromRangeChangeEvents(this);
if (listRefresher != null)
{
listRefresher.Dispose();
listRefresher = null;
}
foreach (LocalReminderData r in localReminders.Values)
{
r.StopReminder(logger);
}
// for a graceful shutdown, also handover reminder responsibilities to new owner, and update the ReminderTable
// currently, this is taken care of by periodically reading the reminder table
return(TaskDone.Done);
}
