public async Task <RecurringTask> AddRecurringTask(Expression <Action> action, string crontab, string taskName)
{
var recurringTask = new RecurringTask(action.ToTaskInfo(), crontab, RecurringTaskKey(taskName));
if (await RecurringTaskDoesNotExistOrNeedsChange(recurringTask))
{
await EnqueueRecurringTask(recurringTask);
}
return(recurringTask);
}
public async Task <RecurringTask> AddRecurringTask(Expression <Action> action, TimeSpan interval, string taskName)
{
var recurringTask = new RecurringTask(action.ToTaskInfo(), interval, RecurringTaskKey(taskName));
if (await RecurringTaskDoesNotExistOrNeedsChange(recurringTask))
{
await EnqueueRecurringTask(recurringTask);
return(recurringTask);
}
return(null);
}
private async Task EnqueueRecurringTask(RecurringTask recurringTask)
{
var serializedTaskInfo = JsonTaskInfoSerializer.Serialize(recurringTask.TaskInfo);
await _taskQueue.Backend.SetMapFields(ScheduledTasksMapKey,
(recurringTask.TaskKey, serializedTaskInfo),
($"isRecurring::{recurringTask.TaskKey}", true),
($"serializedRecurringTask::{recurringTask.TaskKey}", JsonTaskInfoSerializer.Serialize(recurringTask)));
var nextRunTimestamp = recurringTask.GetNextRunTimestamp(recurringTask.StartTime);
await _taskQueue.Backend.AddToOrderedSet(
ScheduledTasksOrderedSetKey,
nextRunTimestamp,
recurringTask.TaskKey);
}
public bool IsEquivalent(RecurringTask comparisonRecurringTask)
{
if (comparisonRecurringTask == null)
{
throw new ArgumentException("comparisonRecurringTask must not be null");
}
if (comparisonRecurringTask.TaskKey != TaskKey)
{
throw new Exception("Cannot compare with a recurringTask with a different TaskKey.");
}
return(TaskInfo.IsEquivalent(comparisonRecurringTask.TaskInfo) &&
Interval == comparisonRecurringTask.Interval &&
string.Equals(Crontab, comparisonRecurringTask.Crontab, StringComparison.Ordinal));
}
private async Task <bool> RecurringTaskDoesNotExistOrNeedsChange(RecurringTask recurringTask)
{
var deserializedRecurringTask = await GetRecurringTask(recurringTask.TaskKey);
if (deserializedRecurringTask == null)
{
return(true);
}
if (!recurringTask.IsEquivalent(deserializedRecurringTask))
{
return(true);
}
return(false);
}
public async Task <bool> CancelRecurringTask(RecurringTask recurringTask)
{
return(await CancelTask(recurringTask.TaskKey));
}